厌氧－缺氧－好氧处理城市废水系统缺氧相中的脱氮硫杆菌

THIOBACILLUS DENITRIFICANS IN THE ANOXIC PHASE OF A COMBINED ANAEROBIC-ANOXIC-OXIC MUNICIPAL WASTEWATER TREATMENT PROCESS

利用厌氧－缺氧－好氧处理城市废水的中试规模系统，对其缺氧相中的脱氮硫杆菌进行了研究。结果表明，脱氮硫杆菌的最高脱氮作用率、氧化Ｎａ＿２Ｓ的最高浓度、Ｓ￣（２－）的最高污泥负荷率和污泥中脱氮硫杆菌的最高含量（ＭＰＮ）分别为３．６ｍｇ－ＮＯ￣－＿３／ｇＶＳＳ·ｈ、１７５０ｍｇ／Ｌ、２５ｍｇ－Ｓ￣（２－）／ｇＶＳＳ·ｄ和１．１×１０￣８／ｇＶＳＳ。脱氮硫杆菌在氧化二价硫成硫酸并还原硝酸为氮气的过程中起着相当有意义的作用。

A pilot scale of anaerobic-anoxic-oxic municipal ivastewater treatment process was utilized to study Thiobacillus denitrificans in the anoxicphase. The results indicatedthat the maximum denitrification rate, the maximumconcentration of oxidizing sulphide, the highest sludge loading rate of S2and the highest number of Thiobacillus denitrificans in the sludge were 3.6mg/gVSS.h, 1750mg.Na2S.9H2O/L, 25mg-S2/gVSS.d and 1. 1×108/gVSS respectively.Thiobacillus denitrificans plays a considerable significant role in the reactions of oxidizing sulphide to sulphate and reducing nitrate to nitrogen gas in the anoxic phase of the system.