摘要
鉴于初期雨水面源污染突发性、无规律性、非连续性等特点,常规的活性污泥处理工艺难以有效应对。结合九江市中心城区降雨特征及工程实际应用需要,首先提出MBBR工艺在雨天满负荷旱天低负荷运行的思路。发现雨天满水量负荷0.44 m3/h,旱天在低水量负荷(10%雨天满负荷)情况下已经能够正常维持微生物活性并发挥良好的有机物去除效果,进一步提高旱天水量负荷(提升至30%、50%、70%)对CODcr和NH3-N去除率无明显提高。其次研究了MBBR系统在长期未降雨时,能接受的最大停置时间。结果表明,在原水CODcr和NH3-N浓度分别98.67 mg/L和13.01 mg/L,停置期为4 d、6 d和8 d时,出水CODcr浓度均能达到地表IV类水标准;停置期为4 d时,出水NH3-N浓度可达IV类水标准,超过4 d后,MBBR系统对NH3-N的去除效果大幅度降低,出水远超IV类水标准。此运行思路和试验参数可为实际工程运维调度及相关工程方案设计提供一定参考。
On account of the sudden, irregularity and discontinuity of the initial rainwater, the conventional activated sludge treatment process is difficult to deal with effectively. Combined with the rainfall characteristics of central urban area of Jiujiang City and the practical application needs of the project, firstly the idea of MBBR process running at full load in rainy days and low load in dry days is put forward. It is found that the MBBR process could normally maintain the microbial activity and play a good effect of organic matter removal at the full water load in rainy days (0.44 m3/h) and 10% full load in dry days. Further increasing the water load in dry days (to 30%, 50%, 70%) has no significant improvement on the removal rate of CODcr and NH3-N. Secondly, the maximum outage period which MBBR system can accept when there is no rainfall for a long time is studied. The results show that when the concentrations of CODcr and NH3-N in raw water are 98.67 mg/L and 13.01 mg/L, respectively, and the stopover period was 4, 6 and 8 days, the effluent CODcr con-centrations could reach the surface water level of Class IV. When the stopping period is 4 days, the effluent NH3-N concentration can reach the Class IV water standard. More than 4 days, the removal effect of MBBR system on NH3-N is greatly reduced, and the effluent is far beyond the class IV water standard. This running idea and test parameters can provide some reference for actual engineering operation and maintenance scheduling and related engineering scheme design.
出处
《环境保护前沿》
CAS
2023年第2期447-454,共8页
Advances in Environmental Protection
