摘要
采用化学除磷工艺处理城市污水,重点对比研究了单点与多点化学强化除磷工艺对TP与氮素去除效果的影响。结果表明,对于单点化学除磷工艺,PAC存在除磷极限,过量投加会造成药剂成本增加,对TP指标的控制无明显积极作用;采用多点化学强化除磷工艺,出水TP质量浓度能降至0.08 mg/L左右,去除率高达98.5%以上,相比单点化学除磷工艺而言,浓度下降了74.3%,下降趋势明显;基于本实验所采用的8种多点化学强化除磷工况,较为优化的A点PAC投加量为20 kg/km^(3),B点PFS投加量为17.5 kg/km^(3),该工况下,出水TP平均质量浓度为0.16 mg/L,TN平均质量浓度为9.17 mg/L,NH3-N平均质量浓度为0.20 mg/L,显著优于一级A排放标准,相比原工况,全年可节约107余万元的除磷剂费用,且出水TP与氮素指标能实现更加稳健的控制,有效促进了成本与水质的双赢。
Chemical phosphorus removal process was used for municipal wastewater treatment. The effects of single-point and multi-point chemical enhanced phosphorus removal processes on total phosphorus and nitrogen removal were mainly studied. The results showed that, for single-point chemical phosphorus removal process, PAC had a phosphorus removal limit, excessive dosage of PAC would increase the cost of dosing, and it had no significant positive effect on the control of total phosphorus index. The total phosphorus in effluent could be reduced to about 0.08 mg/L by using multi-point chemical enhanced phosphorus removal process, and the removal rate reached as high as 98.5%. Compared with single-point chemical phosphorus removal process, the concentration of total phosphorus in effluent decreased by 74.3%, and the downward trend was obvious. Based on the eight different multi-point chemical enhanced phosphorus removal conditions, the optimum PAC dosage in A-point and PFS dosage in B-point was 20 kg/km^(3) and 17.5 kg/km^(3) respectively. Under this operating condition, the average concentration of total phosphorus, total nitrogen and ammonia nitrogen in the effluent was 0.16 mg/L, 9.17 mg/L and 0.20 mg/L, respectively, which was significantly better than the first level A emission standard.Compared with the original condition, it could save more than 1.07 million yuan in phosphorus removal agent cost in the whole year, and the total phosphorus and nitrogen index of effluent could achieve more robust control, and effectively promoted the win-win of cost and water quality.
作者
李航
董立春
吕利平
LI Hang;DONG Lichun;LÜLiping(Chong Qing Three Gorges Water Yubei Drainage Co.Ltd.,401120;School of Chemistry and Chemical Engineering,Chongqing University,401331;School of Chemistry and Chemical Engineering,Yangtze Normal University,408100,Chongqing,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2021年第10期90-93,98,共5页
Technology of Water Treatment
基金
重庆市教委科学技术研究计划青年项目(KJQN201901429)。
关键词
化学除磷
改良型A^(2)/O工艺
脱氮除磷
聚合氯化铝
聚合硫酸铁
chemical phosphorus removal
improved A^(2)/O process
nitrogen and phosphorus removal
polyaluminium chloride
polyferric sulfate
