基于A^3O工艺的工业混合污水处理达标技改研究

Research on technical renovation of industrial mixed sewage treatment based on A^3O process

采用A^3O工艺和A^3O-絮凝沉淀工艺处理工业混合污水,探讨达标排放的可行性。试验结果表明,接种原污水厂种泥的A^3O工艺试验出水与污水厂CASS工艺实际运行情况相同,出水CODCr浓度均不达标,对NH_3-N无降解能力;接种生活污水厂种泥的A^3O工艺出水CODCr浓度不达标,但NH_3-N最终可稳定达标,置换同样种泥的污水厂CASS工艺,出水CODCr浓度不达标,NH_3-N先降低后升高直至无降解能力。A^3O-絮凝沉淀深度处理试验结果显示,出水NH_3-N、TP浓度可以达标,CODCr的平均去除率为86.2%;SMP分析显示絮凝沉淀后多糖浓度降为0,腐植酸去除率为52%。对A^3O进出水及絮凝沉淀出水相对分子质量检测,发现集中在103~104范围内的物质均占60%左右,且不能有效去除,絮凝后出水CODCr的平均质量浓度为41.6 mg/L,平均去除率为44.2%。

A3O process and A3O-flocculation sedimentation process were used to treat industrial mixed sewage, and the feasibility of reaching the discharge standard through the treatment was discussed. The test re- suits showed that, the quality of the effluent water from A3O process which inoculated with sludge from the sewage treatment plant was the same as that of the effluent water from CASS process during actual operation, both of the two processes could not obtain up-to-standard effluent CODcr concentration, and had no degradation ability to NH3-N either. Using A3O process which inoculated with sludge from the municipal wastewater plant to treat the sewage, the CODcr concentration in the effluent water could not reach the discharge standard; on con- trary, the NH3-N concentration eventually reach the discharge standard stably. Similarly, replacing the same kind of seed sludge with the original one in CASS process of the said plant, the effluent CODcr concentration could not reach the discharge standard, the NH3-N concentration decreased at the beginning and then kept increasing until it could not be degraded. The results of the test on advanced treatment of sewage using A3O-flocculation sedi- mentation indicated that, the effluent NH3-N and TP concentration could reach the discharge standard, and theaverage removal rate of CODcr was 86.2%. The results of SMP analysis showed that, after flocculation sedimentation, polysaecharide concentration decreased to 0, the removal rate of humus acid was 52%. Through the relative molecular mass detection on influent and effluent water of A3O process and effluent water from flocculation sedi- mentation, it could be found that, matters with molecular weight of 103 - 104 accounted for on average 60% of the total, which could not be effectively removed, after flocculation, the average mass concentration of CODcr in the effluent water was 41.6 mg/L with a removal rate of 44.2%.