高氨氮丙烯腈生产废水处理技术研究

Study on Technologies for Treatment of Acrylonitrile Wastewater with High Ammonia Concentration

在A／O工艺处理丙烯腈生产废水工程中发现，该废水对硝化过程产生强烈的抑制现象，30d启动中对氨氮无去除效果。通过控制进水流量、浓度，补充葡萄糖作为辅助碳源等措施，经56d调试，工程二次启动成功。至今，近1200d的稳定运行结果显示，装置进水COD、TKN、NH3-N与TCN浓度分别为（509～2527）、（190—516）、（118～410）与（7．43～13．37）mg／L，出水浓度分别为（201±46．8）、（20．5±5．50）、（0．19±0．02）与（0．37±0．08）mg／L，污泥对氰化物的降解速率为1．05mg／（L·h）。成功的关键在于培养与提高系统中活性污泥对以氰化物为代表的有毒有害物质的降解能力，从而消除其对硝化过程的抑制。

The inhibition of acrylonitrile wastewater on nitrification was found in a full-scale A/O biological treatment system. During the 30 d of the first start-up, there was little removal of NH3 - N. Some methods, such as controlling the influent flow rate and concentration and adding glucose as an addi- tional carbon source, were applied to the second start-up to eliminate the inhibition. After 56 d, the sys- tem was started up successfully. During stable operation for almost 1 200 d, the influent concentrations of COD, TKN, NH3 -N and TCN were 509 to 2 527, 190 to 516, 118 to 410 and 7.43 to 13.37 mg/L, and the effluent concentrations were （ 201 ± 46.8 ）, （ 20.5 ± 5.50 ）, （ 0. 19 ±0.02 ） and （ 0.37 ±0.08） mg/L, respectively. The TCN d improving the cyanide-degrading ability cation. egradation rate was 1.05 mg/（ L . h）. The key to success was of the suspended sludge to eliminate cyanide inhibition on nitrifi-cation.