{"id":7120,"date":"2024-07-15T07:16:03","date_gmt":"2024-07-15T07:16:03","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=7120"},"modified":"2026-04-28T10:42:31","modified_gmt":"2026-04-28T10:42:31","slug":"nitrification-denitrification-20-questions-and-answers","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/nitrification-denitrification-20-questions-and-answers\/","title":{"rendered":"Nitrification D\u00e9nitrification 20 questions et r\u00e9ponses"},"content":{"rendered":"<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> A practical sourcing decision for specialty chemicals starts with the use case first, then checks specification, compatibility, handling, and any regulatory or customer-specific requirement.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p><b>\u25b7 Question 1 : Quel est le meilleur rapport carbone\/azote pour la d\u00e9nitrification dans la pratique ?<\/b> <b>Est-il inf\u00e9rieur \u00e0 5 ou \u00e0 6-8 ?<\/b><\/p>\n<p>R : Dans la pratique, je pense personnellement qu'il est pr\u00e9f\u00e9rable de contr\u00f4ler le rapport carbone\/azote \u00e0 6-8.<\/p>\n<p><b>\u25b7 Question 2 : La salinit\u00e9 de 2% produit une certaine inhibition des bact\u00e9ries nitrifiantes, s'agit-il de chlorure de sodium pur ?<\/b><\/p>\n<p>R : Le chlorure de sodium pur est utilis\u00e9 en laboratoire ; dans l'application r\u00e9elle, il peut y avoir un l\u00e9ger changement, mais il est essentiellement contr\u00f4l\u00e9 \u00e0 environ 2%, plus de 2% de l'activit\u00e9 bact\u00e9rienne sera affect\u00e9e davantage.<\/p>\n<p><b>\u25b7 Question 3 : Les bact\u00e9ries que vous avez introduites conviennent-elles \u00e0 la m\u00e9thode des boues activ\u00e9es ordinaires ou peuvent-elles \u00eatre combin\u00e9es \u00e0 l'oxydation par contact et au lit fluidis\u00e9 porteur ?<\/b><\/p>\n<p>R : Tous les types de bact\u00e9ries peuvent \u00eatre utilis\u00e9s. En principe, tant qu'il s'agit d'un syst\u00e8me biochimique, il est th\u00e9oriquement possible d'utiliser des souches sp\u00e9ciales de bact\u00e9ries pour l'am\u00e9lioration biologique.<\/p>\n<p><b>\u25b7 Question 4 : Quel est le dosage g\u00e9n\u00e9ral des bact\u00e9ries nitrifiantes pour les stations d'\u00e9puration des eaux us\u00e9es urbaines ?<\/b><\/p>\n<p>R : Le dosage se r\u00e9f\u00e8re g\u00e9n\u00e9ralement \u00e0 deux donn\u00e9es, l'une est la concentration d'azote ammoniacal dans l'eau influente, la station d'\u00e9puration des eaux us\u00e9es urbaines est g\u00e9n\u00e9ralement comprise entre 30 et 50 mg\/l, le contr\u00f4le des effluents est de 5 mg\/l ou moins ; la seconde est le temps de r\u00e9sidence, la station d'\u00e9puration des eaux us\u00e9es urbaines n'a g\u00e9n\u00e9ralement pas beaucoup de bact\u00e9ries nitrifiantes, le dosage est d'environ un pour 100 000, il est recommand\u00e9 d'utiliser trois fois dans la phase initiale, ce qui garantira un meilleur effet.<\/p>\n<p><b>\u25b7 Question 5 : Que signifie N-serve dans l'inhibiteur de bact\u00e9ries nitrifiantes ?<\/b><\/p>\n<p>R : Il s'agit d'un compos\u00e9 tr\u00e8s complexe, la 2-chloro-6-(trichlorom\u00e9thyl)pyridine.<\/p>\n<p><b>\u25b7 Question 6 : Qu'est-ce qui est le plus efficace, le carbonate de sodium ou l'hydroxyde de sodium, pour l'alcalinit\u00e9 qui doit \u00eatre reconstitu\u00e9e pendant la d\u00e9nitrification, et quelle est la diff\u00e9rence ?<\/b><\/p>\n<p>R : Il est plus efficace d'utiliser du carbonate de sodium, mais cela co\u00fbte plus cher.<\/p>\n<p><b>\u25b7 Question 7 : Dans quelle mesure les bact\u00e9ries nitrifiantes tol\u00e8rent-elles le choc toxique ?<\/b> <b>Quelle est la charge des bact\u00e9ries d\u00e9nitrifiantes ?<\/b><\/p>\n<p>R : Les bact\u00e9ries nitrifiantes ne tol\u00e8rent g\u00e9n\u00e9ralement pas tr\u00e8s bien le choc toxique, car ce sont des bact\u00e9ries autotrophes, et elles sont tr\u00e8s affect\u00e9es par une toxicit\u00e9 plus importante. Il est difficile de d\u00e9terminer la charge des bact\u00e9ries d\u00e9nitrifiantes seules, cela d\u00e9pend de la quantit\u00e9 de bact\u00e9ries dans la piscine.<\/p>\n<p><b>\u25b7 Question 8 : Dans notre op\u00e9ration AO, le pH du r\u00e9servoir a\u00e9robie est de 6,2, la DCO de 600 mg\/L, l'ammoniaque de 140 mg\/L. Quelle est la quantit\u00e9 d'ajustement du pH appropri\u00e9e ?<\/b> <b>Est-il possible d'ajouter du carbonate de soude dans un r\u00e9servoir a\u00e9robie ?<\/b><\/p>\n<p>R\u00e9ponse : Un ajustement du pH entre 7,0 et 7,5 est g\u00e9n\u00e9ralement suffisant, et il est possible d'ajouter de la soude en flocons.<\/p>\n<p><b>\u25b7Q9 : Votre produit est-il solide ?<\/b> <b>Doit-il \u00eatre activ\u00e9 ?<\/b><\/p>\n<p>R : Les bact\u00e9ries nitrifiantes sont liquides, les bact\u00e9ries d\u00e9nitrifiantes sont solides.<\/p>\n<p><b>\u25b7 Question 10 : \u00c9tant donn\u00e9 qu'il existe de nombreux cas d'eaux us\u00e9es sp\u00e9ciales avec un volume d'eau limit\u00e9, j'aimerais conna\u00eetre le co\u00fbt de la pr\u00e9paration des souches et savoir combien de temps il faut pour que des micro-organismes sp\u00e9cifiques soient appliqu\u00e9s \u00e0 la r\u00e9solution de probl\u00e8mes techniques, de la pr\u00e9paration \u00e0 l'effet ?<\/b><\/p>\n<p>R : D'une mani\u00e8re g\u00e9n\u00e9rale, les souches de bact\u00e9ries peuvent \u00eatre pr\u00e9par\u00e9es \u00e0 grande \u00e9chelle tr\u00e8s rapidement. Le co\u00fbt de pr\u00e9paration varie en fonction de la souche, les souches de bacilles auront un co\u00fbt plus faible, les bact\u00e9ries nitrifiantes sont de type chimio-autotrophe, le co\u00fbt sera relativement \u00e9lev\u00e9 ; en outre, si un stockage sp\u00e9cial est n\u00e9cessaire, le co\u00fbt sera \u00e9lev\u00e9.<\/p>\n<p>En g\u00e9n\u00e9ral, les souches sont introduites et l'effet est visible au bout d'une semaine environ.<\/p>\n<p><b>\u25b7 Question 11 : Y a-t-il un processus d'att\u00e9nuation naturelle apr\u00e8s l'introduction des bact\u00e9ries biologiques sp\u00e9cifiques et l'absence de choc pour l'eau entrante ?<\/b> <b>Dans le cas du traitement des eaux us\u00e9es p\u00e9trochimiques que vous avez cit\u00e9, l'effluent a d'abord diminu\u00e9 de mani\u00e8re significative, puis il y a eu une fluctuation graduelle et une augmentation au fil du temps.<\/b><\/p>\n<p>R : Cela d\u00e9pend de la souche bact\u00e9rienne. Certaines bact\u00e9ries peuvent exister dans cet environnement pendant longtemps avec peu ou pas d'att\u00e9nuation, comme les bact\u00e9ries nitrifiantes. D'autres bact\u00e9ries se d\u00e9gradent sur de plus longues p\u00e9riodes, et il faut alors leur apporter des compl\u00e9ments. Ceci est li\u00e9 aux caract\u00e9ristiques des souches elles-m\u00eames, car leur introduction dans un syst\u00e8me \u00e0 boues activ\u00e9es entrera en comp\u00e9tition avec les micro-organismes indig\u00e8nes.<\/p>\n<p><b>\u25b7 Question 12 : Existe-t-il des donn\u00e9es sur le taux de nitrification, le taux de d\u00e9nitrification, c'est-\u00e0-dire combien de grammes d'azote ammoniacal ou de nitrate sont d\u00e9grad\u00e9s par un seul gramme de bact\u00e9rie par heure ?<\/b><\/p>\n<p>R : Le meilleur taux de nitrification peut \u00eatre de 800mgNH4+-N\/(L-h), le taux de d\u00e9nitrification est plus difficile \u00e0 mesurer et des donn\u00e9es pr\u00e9cises ne sont pas encore disponibles.<\/p>\n<p><b>\u25b7 Question 13 : Je vois qu'il y a beaucoup de litt\u00e9rature qui dit que les bact\u00e9ries nitrifiantes ont aussi des exigences sur la concentration de d\u00e9part, qu'en pensez-vous ?<\/b><\/p>\n<p>R : Plus la concentration d'ammoniac est \u00e9lev\u00e9e, plus les bact\u00e9ries nitrifiantes sont inhib\u00e9es, m\u00eame si elles ont pour fonction d'\u00e9liminer l'ammoniac.<\/p>\n<p><b>\u25b7Question 14 : Vos produits matures peuvent-ils \u00eatre adapt\u00e9s \u00e0 diff\u00e9rentes qualit\u00e9s d'eaux us\u00e9es et combien de temps cela prend-il pour s'adapter \u00e0 diff\u00e9rentes qualit\u00e9s d'eau ?<\/b><\/p>\n<p>R : L'agent bact\u00e9rien a une courte p\u00e9riode d'adaptation aux diff\u00e9rentes qualit\u00e9s d'eau. En g\u00e9n\u00e9ral, les bact\u00e9ries nitrifiantes peuvent fonctionner en trois jours, mais il est garanti qu'elles fonctionneront d\u00e9finitivement en sept jours.<\/p>\n<p><b>\u25b7Question 15 : Avez-vous mesur\u00e9 l'effet des surfactants sur les bact\u00e9ries nitrifiantes, et quels sont les autres inhibiteurs de bact\u00e9ries nitrifiantes ?<\/b><\/p>\n<p>R : Les agents tensioactifs n'ont pas \u00e9t\u00e9 mesur\u00e9s et il existe de nombreux types d'inhibiteurs ; vous pouvez donc v\u00e9rifier par vous-m\u00eame.<\/p>\n<p><b>\u25b7Q16 : Outre l'ac\u00e9tyl\u00e8ne, quelles sont les substances toxiques courantes qui affectent les bact\u00e9ries nitrifiantes et les bact\u00e9ries nitrosochimiques ?<\/b><\/p>\n<p>R : Certains antibiotiques courants contre les bact\u00e9ries gram-n\u00e9gatives, les m\u00e9taux lourds (Cu et autres) sont \u00e9galement plus sensibles.<\/p>\n<p><b>\u25b7 Question 17 : Combien de temps les bact\u00e9ries d\u00e9nitrifiantes doivent-elles rester dans la zone anoxique pour obtenir les meilleurs r\u00e9sultats ?<\/b><\/p>\n<p>R : La quantit\u00e9 de nitrates et la concentration de bact\u00e9ries influencent le temps de s\u00e9jour ; en g\u00e9n\u00e9ral, plus il y a de nitrates, plus le temps de s\u00e9jour doit \u00eatre long.<\/p>\n<p><b>\u25b7 Question 18 : Quelle est la dur\u00e9e du cycle de g\u00e9n\u00e9ration des bact\u00e9ries nitrifiantes et des bact\u00e9ries d\u00e9nitrifiantes ?<\/b><\/p>\n<p>R : Les bact\u00e9ries nitrifiantes sont des bact\u00e9ries chimio-autotrophes, la reproduction est plus lente, le cycle de g\u00e9n\u00e9ration est plus long, g\u00e9n\u00e9ralement la reproduction d'une g\u00e9n\u00e9ration dure 10 heures ou m\u00eame des dizaines d'heures, ce qui explique \u00e9galement le co\u00fbt \u00e9lev\u00e9. Les bact\u00e9ries d\u00e9nitrifiantes sont une grande classe, comprenant de nombreuses sortes de bact\u00e9ries, qui peuvent convertir le nitrate en azote, le cycle de g\u00e9n\u00e9ration sera plus court, la reproduction plus rapide, maintenant commune sur le march\u00e9, le cycle de g\u00e9n\u00e9ration est essentiellement en douzaines de minutes.<\/p>\n<p><b>\u25b7 Question 19 : Le reflux retourne directement dans le r\u00e9servoir ana\u00e9robie, les bact\u00e9ries d\u00e9nitrifiantes peuvent-elles agir pleinement ?<\/b><\/p>\n<p>R : Certainement pas, car la d\u00e9nitrification doit s'effectuer dans un environnement anoxique.<\/p>\n<p><b>\u25b7Question 20 : Quelle est la concentration initiale d'ammoniaque pour inhiber la nitrification ?<\/b><\/p>\n<p>R : Les souches de bact\u00e9ries r\u00e9agissent diff\u00e9remment \u00e0 la concentration initiale d'ammoniac. Normalement, une concentration d'ammoniaque sup\u00e9rieure \u00e0 100 mg\/l inhibe les bact\u00e9ries nitrifiantes.<\/p>\n<p>&nbsp;<\/p>\n<table style=\"border-collapse: collapse; width: 667.52pt;\" border=\"0\" width=\"890\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr style=\"height: 63.00pt;\">\n<td class=\"et3\" style=\"height: 63pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"84\"><strong>Phosphonates Antiscalants, inhibiteurs de corrosion et agents ch\u00e9lateurs<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><span style=\"color: #00ccff;\"><a style=\"color: #00ccff;\" href=\"https:\/\/longchangchemical.com\/fr\/products\/atmp-cas-6419-19-8\/\">Acide aminotrim\u00e9thyl\u00e8ne phosphonique (ATMP)<\/a><\/span><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 6419-19-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><span style=\"color: #00ccff;\"><a style=\"color: #00ccff;\" href=\"https:\/\/longchangchemical.com\/fr\/products\/hedp-cas-2809-21-4-2\/\">Acide 1-Hydroxy Ethylid\u00e8ne-1,1-Diphosphonique (HEDP)<\/a><\/span><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">N\u00b0 CAS 2809-21-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/edtmpa-solid-cas-1429-50-1\/\"><span style=\"color: #00ccff;\">Acide \u00e9thyl\u00e8ne diamine t\u00e9tra (m\u00e9thyl\u00e8ne phosphonique) EDTMPA (solide)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 1429-50-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/dtpmpa-cas-15827-60-8\/\"><span style=\"color: #00ccff;\">Acide di\u00e9thyl\u00e8ne triamine penta (m\u00e9thyl\u00e8ne phosphonique) (DTPMPA)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 15827-60-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/pbtc-cas-37971-36-1\/\"><span style=\"color: #00ccff;\">Acide 2-Phosphonobutane -1,2,4-Tricarboxylique (PBTC)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 37971-36-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/hpaa-cas-23783-26-8\/\"><span style=\"color: #00ccff;\">Acide 2-Hydroxy Phosphonoac\u00e9tique (HPAA)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 23783-26-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/hmdtmpa-cas-23605-74-5\/\"><span style=\"color: #00ccff;\">Acide hexa-m\u00e9thyl\u00e8ne-diamine-t\u00e9tra (m\u00e9thyl\u00e8ne-phosphonique) HMDTMPA<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 23605-74-5<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Acide polyamino poly\u00e9ther m\u00e9thyl\u00e8ne phosphonique (PAPEMP)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\"><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/bhmtpmp-cas-34690-00-1\/\"><span style=\"color: #00ccff;\">Bis(acide hexa-m\u00e9thyl\u00e8ne triamine penta (m\u00e9thyl\u00e8ne phosphonique)) BHMTPMP<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">N\u00b0 CAS 34690-00-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/hempa-cas-5995-42-6\/\"><span style=\"color: #00ccff;\">Acide hydroxy\u00e9thylamino-Di(m\u00e9thyl\u00e8ne phosphonique) (HEMPA)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 5995-42-6<\/td>\n<\/tr>\n<tr style=\"height: 15.75pt;\">\n<td class=\"et3\" style=\"height: 15.75pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"21\"><strong>Sels de phosphonates<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/atmp-na4-cas-20592-85-2\/\"><span style=\"color: #00ccff;\">Sel t\u00e9tra-sodique de l'acide aminotrim\u00e9thyl\u00e8ne phosphonique (ATMP-Na4)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 20592-85-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/atmp-na5-cas-2235-43-0\/\"><span style=\"color: #00ccff;\">Sel penta-sodique de l'acide aminotrim\u00e9thyl\u00e8ne phosphonique (ATMP-Na5)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 2235-43-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/hedp-na-cas-29329-71-3\/\"><span style=\"color: #00ccff;\">Mono-sodium de l'acide 1-Hydroxy Ethylid\u00e8ne-1,1-Diphosphonique (HEDP-Na)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 29329-71-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/hedp-na2-cas-7414-83-7\/\"><span style=\"color: #00ccff;\">\u00a0(HEDP-Na2)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 7414-83-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel t\u00e9tra sodique de l'acide 1 hydroxy \u00e9thylid\u00e8ne-1,1 diphosphonique (HEDP-Na4)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 3794-83-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de potassium de l'acide 1 hydroxy \u00e9thylid\u00e8ne-1,1 diphosphonique (HEDP-K2)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 21089-06-5<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel pentasodique de l'acide \u00e9thyl\u00e8ne diamine t\u00e9tra (m\u00e9thyl\u00e8ne phosphonique) (EDTMP-Na5)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 7651-99-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de sodium Hepta de l'acide di\u00e9thyl\u00e8ne triamine penta (m\u00e9thyl\u00e8ne phosphonique) (DTPMP-Na7)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 68155-78-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de sodium de l'acide di\u00e9thyl\u00e8ne triamine penta (m\u00e9thyl\u00e8ne phosphonique) (DTPMP-Na2)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 22042-96-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Acide phosphonobutane-2,2,4-tricarboxylique, sel de sodium (PBTC-Na4)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 40372-66-5<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de potassium de l'acide hexa-m\u00e9thyl\u00e8ne-diamine-t\u00e9tra (m\u00e9thyl\u00e8ne-phosphonique) HMDTMPA-K6<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 53473-28-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de sodium partiellement neutralis\u00e9 de l'acide bis hexam\u00e9thyl\u00e8ne triamine penta (m\u00e9thyl\u00e8ne phosphonique) BHMTPH-PN(Na2)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 35657-77-3<\/td>\n<\/tr>\n<tr style=\"height: 31.50pt;\">\n<td class=\"et3\" style=\"height: 31.5pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"42\"><strong>Antiscalaire et dispersant polycarboxylique<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Acide polyacrylique (PAA) 50% 63%<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 9003-01-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de sodium de l'acide polyacrylique (PAAS) 45% 90%<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 9003-04-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/hpma-cas-26099-09-2\/\"><span style=\"color: #00ccff;\">Anhydride polymal\u00e9ique hydrolys\u00e9 (HPMA)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 26099-09-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Copolym\u00e8re d'acide mal\u00e9ique et d'acide acrylique (MA\/AA)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 26677-99-6<\/td>\n<\/tr>\n<tr style=\"height: 17.00pt;\">\n<td class=\"et5\" style=\"height: 17.00pt;\" height=\"22\">Copolym\u00e8re d'acide acrylique-2-acrylamido-2-m\u00e9thylpropane sulfonique (AA\/AMPS)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 40623-75-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">TH-164 Acide phosphino-carboxylique (PCA)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 71050-62-9<\/td>\n<\/tr>\n<tr style=\"height: 31.50pt;\">\n<td class=\"et3\" style=\"height: 31.5pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"42\"><strong>Antiscalaire et dispersant biod\u00e9gradable<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 40.50pt;\">\n<td class=\"et5\" style=\"height: 54.00pt;\" rowspan=\"2\" height=\"72\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/pesa-cas-51274-37-4109578-44-1\/\"><span style=\"color: #00ccff;\">Sodium de l'acide poly\u00e9poxysuccinique (PESA)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 51274-37-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 109578-44-1<\/td>\n<\/tr>\n<tr style=\"height: 40.50pt;\">\n<td class=\"et5\" style=\"height: 54.00pt;\" rowspan=\"2\" height=\"72\"><a href=\"https:\/\/longchangchemical.com\/fr\/products\/pasp-cas-181828-06-8-35608-40-6\/\"><span style=\"color: #00ccff;\">Sel de sodium de l'acide polyaspartique (PASP)<\/span><\/a><\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 181828-06-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 35608-40-6<\/td>\n<\/tr>\n<tr style=\"height: 27.00pt;\">\n<td class=\"et3\" style=\"height: 27pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"36\"><strong>Biocide et algicide<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 40.50pt;\">\n<td class=\"et5\" style=\"height: 67.50pt;\" rowspan=\"3\" height=\"90\">Chlorure de benzalkonium (chlorure de dod\u00e9cyl-dim\u00e9thyl-benzyl-ammonium)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 8001-54-5,<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 63449-41-2,<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 139-07-1<\/td>\n<\/tr>\n<tr style=\"height: 40.50pt;\">\n<td class=\"et5\" style=\"height: 81.00pt;\" rowspan=\"2\" height=\"108\">Isothiazolinones<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 26172-55-4,<\/td>\n<\/tr>\n<tr style=\"height: 40.50pt;\">\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 2682-20-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sulfate de t\u00e9trakis(hydroxym\u00e9thyl)phosphonium(THPS)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 55566-30-8<\/td>\n<\/tr>\n<tr style=\"height: 17.00pt;\">\n<td class=\"et5\" style=\"height: 17.00pt;\" height=\"22\">GLUTARALDEHYDE<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 111-30-8<\/td>\n<\/tr>\n<tr style=\"height: 31.00pt;\">\n<td class=\"et3\" style=\"height: 31pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"41\"><strong>Inhibiteurs de corrosion<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de sodium du tolyltriazole (TTA-Na)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 64665-57-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Tolyltriazole (TTA)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 29385-43-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de sodium du 1,2,3-benzotriazole (BTA-Na)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 15217-42-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">1,2,3-Benzotriazole (BTA)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 95-14-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sel de sodium du 2-Mercaptobenzothiazole (MBT-Na)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 2492-26-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">2-Mercaptobenzothiazole (MBT)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 149-30-4<\/td>\n<\/tr>\n<tr style=\"height: 15.75pt;\">\n<td class=\"et3\" style=\"height: 15.75pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"21\"><strong>Pi\u00e9geur d'oxyg\u00e8ne<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Cyclohexylamine<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">Num\u00e9ro CAS 108-91-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Morpholine<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 110-91-8<\/td>\n<\/tr>\n<tr style=\"height: 15.75pt;\">\n<td class=\"et3\" style=\"height: 15.75pt; width: 667.5pt; text-align: center;\" colspan=\"2\" width=\"890\" height=\"21\"><strong>Autres<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Sulfosuccinate de sodium et de di\u00e9thylhexyle<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 1639-66-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">Chlorure d'ac\u00e9tyle<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 75-36-5<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et5\" style=\"height: 13.50pt;\" height=\"18\">TH-GC Agent ch\u00e9lateur vert (acide glutamique, acide N,N-diac\u00e9tique, sel t\u00e9tra sodique)<\/td>\n<td class=\"et6\" style=\"width: 159.75pt;\" width=\"213\">No CAS 51981-21-6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical sourcing checklist for specialty chemical applications<\/h2>\n<p>Specialty-chemical purchasing usually goes more smoothly when teams define the end-use risk first and then verify purity, compatibility, processing behavior, and regulatory fit as one package. That often prevents expensive rework after the material reaches production or customer testing.<\/p>\n<ul>\n<li><strong>Start from the end-use standard:<\/strong> food contact, plastics, coatings, preservation, and industrial processing all create different specification priorities.<\/li>\n<li><strong>Check compatibility in the real system:<\/strong> a compliant material can still be the wrong commercial choice if it destabilizes the formulation or process.<\/li>\n<li><strong>Review handling and storage:<\/strong> some specialty chemicals succeed or fail based on how they behave during blending, transport, or long-term storage.<\/li>\n<li><strong>Use sample validation before scale-up:<\/strong> pilot checks on the intended formula or production step usually save the most time and cost.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-cat-261-cas-32760-80-8\/\">CHLUMINIT 261<\/a>:<\/strong> A direct cationic-photoinitiator reference when cationic curing routes are being screened.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/hpma-monomer-cas-27813-02-1\/\">CHLUMICRYL HPMA<\/a>:<\/strong> Useful when more polarity and adhesion support are needed in the reactive package.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/agesindp-d2608r\/\">CHLUMICRYL DP-D2608R<\/a>:<\/strong> A direct dispersant reference for coating and ink formulation work.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiwe-3071-organic-silicone-surfactant-organosilicone-wetting-agent\/\">CHLUMIWE 3071<\/a>:<\/strong> Useful when organosilicone wetting support is needed in a broad application screen.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why is specification matching not enough for specialty chemicals?<\/strong><br \/>Because a material can meet the basic spec and still fail in the actual formulation, process, or downstream compliance requirement.<\/p>\n<p><strong>Should price be the first filter for specialty raw materials?<\/strong><br \/>Price matters, but technical fit, compliance, and process reliability usually decide whether the material is truly economical in use.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>\u25b7 Question 1: What is the better carbon to nitrogen ratio for denitrification in practice? Is it below 5 or 6-8? A: In practical application, I personally think it is<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[168],"tags":[],"class_list":["post-7120","post","type-post","status-publish","format-standard","hentry","category-water-treatment"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Nitrification Denitrification 20 Questions and Answers - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"\u25b7 Question 1: What is the better carbon to nitrogen ratio for denitrification in practice? Is it below 5 or 6-8? 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