高校实验室废水处理站的运行与调试

Daily operation and management of wastewater treatment station in university laboratories

针对宁波某高校实验室废水处理站运行情况,研究了该废水处理站pH、NH3-N、COD以及重金属的处理效果,并对生物膜镜检和胞外聚合物(EPS)提取分析。实验结果表明:出水COD小于40 mg·L-1,NH3-N去除率维持在70%~90%,且出水pH、NH3-N、COD均满足《污水综合排放标准》(GB 8978-1996)一级排放标准,重金属满足《污水综合排放标准》(GB 8978-1996)三级排放标准;但运行期间废水处理站出现了COD和重金属去除效率低的情况,最终确定原因为废水处理站低负荷运行以及中和调节池和接触氧化池曝气过度。因此,建议减少中和调节和接触氧化池的曝气量,并适当投加碳源以保持废水站稳定运行。

Aiming at the operation of the laboratory wastewater treatment station in a university in Ningbo, the treatment effects of pH, NH3-N, COD and heavy metals in this station were studied, the biofilm was observed with microscopy and the extracellular polymer(EPS) were extracted and analyzed. The experimental results showed that the effluent COD was lower than 40 mg·L-1, the NH3-N removal rate was maintained at 70%~90%,and the effluent pH, NH3-N and COD met the first-level discharge standard of Integrated Wastewater Discharge Standard(GB 8978-1996), and the effluent heavy metals met the third-level discharge standard of Integrated Wastewater Discharge Standard(GB 8978-1996), but low removal rates of COD and heavy metals in wastewater treatment station occurred sometimes during operation. The final determined reason was the lowloading operation of the wastewater treatment station and the excessive aeration of the neutralization regulation tank and the contact oxidation tank. Therefore, it is suggested to reduce the aeration of neutralization regulation and contact oxidation tank, and add carbon source properly to maintain the stable operation of wastewater station.