固定化硝化菌强化处理精细化工废水的中试研究

Treatment of Fine Chemistry Wastewater Using Gel-embedded Nitrobacteria

为了考察硝化菌包埋载体处理精细化工废水的技术可行性和可靠性并获得工程应用的参数,以A/O工艺中试系统为试验平台,重点研究了硝化菌包埋载体A/O系统在不同负荷下对精细化工废水的处理效果及其影响因素。在载体投加率为8.5%、污泥浓度为3 000 mg/L左右、水温为20℃左右、处理水量为12 m^3/d的条件下,采用已活化的载体处理精细化工废水时出水氨氮在5 mg/L以下,远低于《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级B排放标准,且负荷提高40%后,出水氨氮平均浓度仍能达到一级B标准;与常规水解酸化+A/O工艺相比,中试在水力停留时间仅为常规工艺30%~40%的条件下,对氨氮和COD的去除率均有提高,且出水氨氮浓度明显下降,硝化菌载体工艺表现出了良好的抗负荷冲击性能。

In order to verify the feasibility and reliability of gel-embedded nitrobacteria carriers and obtain parameters for engineering application, the A/O system combined with gel-embedded nitrobac- teria was used to treat fine chemistry wastewater, and the treatment effect and influence factors were stud- ied under different loads. The results showed that the effluent concentration of NH3 - N was below 5 mg/ L under conditions of carrier adding ratio 8.5 %, sludge concentration 3 000 mg/L, temperature about 20 ℃, and influent loading 12 m3/d, which was lower than the first grade B standards of GB 18918 -2002. When the influent loading reached to 1.40 times of design value, the effluent concentration of NH3 - N still could meet the first grade B standards of GB 18918 -2002. Compared with conventional hydrolysis acidification ＋ A/O process, the removal rate of ammonia nitrogen and COD were increased, and the ef- fluent concentration of ammonia nitrogen decreased significantly, when the hydraulic retention time of the pilot was only 30% -40% of conventional process, which revealed gel-embedded nitrobacteria carriers had high resistance on impact loading.