硅藻土基复合粉末载体在城镇污水处理中的应用  

Application of Diatomite-Based Composite Powder Carrier in Municipal Wastewat Treatment

作　　者：颜加兴 顾群 邓宇 易境 柴晓利[2] 戴晓虎[2] YAN Jiaxing;GU Qun;DENG Yu;YI Jing;CHAI Xiaoli;DAI Xiaohu(Hunan Sanyou Environmental Protection Co.,Ltd.,Changsha 410205,China;College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]湖南三友环保科技有限公司,湖南长沙410205 [2]同济大学环境科学与工程学院,上海200092

出　　处：《净水技术》2023年第3期106-112,共7页Water Purification Technology

基　　金：流域水体污染控制与生态修复集成核心技术攻关(2019GK4004);湘江流域多源有机固废生物转化集成技术研究(2020WK2024)。

摘　　要：以硅藻土作为微生物载体、硫铁矿作为替代碳源功能材料,经湿式方法复合得到复合粉末载体。通过扫描电子显微镜(SEM)对复合粉末载体的微观结构进行观测,发现硫铁矿紧密吸附在硅藻土表面上和孔隙内,投加后其表面大量附着生物膜。在长沙某水质净化厂进行了复合粉末载体用于实际城镇污水处理中试试验,试验结果表明,在进水BOD 5/TN均值不足2.0、生化池水力停留时间仅为4.37 h、后端无深度处理的条件下,中试系统主要出水水质指标COD_(Cr)<30 mg/L、氨氮<1.5 mg/L、TN<10 mg/L、TP<0.70 mg/L,与厂区基本相同;同时污泥沉降性能得到改善,污泥的SV 30和SVI均值分别为45%和46.7 mL/g。复合粉末载体可强化脱氮除磷,在不增加生化单元占地面积的条件下,实现污水处理能力大幅提升。Diatomite as microbial carrier and pyrite as carbon source functional material,the composite powder carrier was prepared by wet method.The microstructure of composite powder carrier observation by scanning electron microscope show that pyrite was tightly adsorbed on the surface and in the pores of diatomite,and lots of biomembranes on the surface of the composite powder carrier after added.The pilot-scale test was carried out in a wastewater treatment plant(WWTP)in Changsha,which aimed to treat municipal wastewater by add composite powder carrier.The experimental result showed that under the conditions that the mean BOD 5/TN of influent was less than 2.0,the HRT of biochemical tank was only 4.37 h and no further treatment at the back end,and the main effluent quality indices of the pilot-scale test were basically the same as the WWTP(COD_(Cr)<30 mg/L,ammonia nitrogen<1.5 mg/L,TN<10 mg/L,TP<0.70 mg/L).At the same time,the sludge settle performance was improved,and the mean SV 30 and SVI of sludge were 45%and 46.7 mL/g respectively.The composite powder carrier can enhance efficiency of nitrogen and phosphorus removal,and improve the capacity of wastewater treatment greatly without increasing the area of biochemical unit.

关 键 词：硅藻土 硫铁矿 复合粉末载体 城镇污水处理 污泥沉降性能 

分 类 号：X703[环境科学与工程—环境工程]