摘要
生物滞留系统以工程级配介质土作为填料时,为满足脱氮要求需在介质土中额外添加固体碳源。以生物滞留系统处理阳台洗衣废水和降雨径流为研究对象,探讨了不同纤维素固体碳源(木屑、椰壳、玉米渣、稻壳、小麦秸秆)、不同添加量(0%、3%、5%、7%,质量比)对系统除污性能的影响。结果表明,所有纤维素碳源材料均可释放大量有机碳满足反硝化需求,其中木屑反硝化能力最强,NO_(3)~--N去除率高达95%。雨-灰水双模式下,外加碳源能有效提高生物滞留系统除氮能力,尤其是对于NO_(3)~--N的去除,但过多的碳源会造成出水NH_(4)~+-N的升高;外加碳源可显著提高系统除磷能力,且随添加量而增强;碳源的添加会导致出水COD浓度升高,出现有机物淋洗现象。综合考虑污染物控制目标,在淹没区介质土中添加3%木屑可满足雨-灰水双模式生物滞留系统处理老旧小区阳台洗衣废水和降雨径流对碳源的需求。
An additional solid-state carbon sources should be added to the medium soil for denitrification requirements,when engineering graded medium soil is used as the filler in the bio-retention system.This manuscript focuses on the treatment of balcony laundry wastewater and runoff by bioretention system,exploring different cellulose solid-state carbon sources(sawdust,coconut husk,corn residue,rice husk,wheat straw),and addition amounts(0%,3%,5%,7%,respectively,wt.%)on the decontamination performance of the system.The results show that all the carbon source materials could release a large amount of organic carbon,which is needed in the denitrification process.Among them,the sawdust additive group exhibits the strongest denitrification ability,with a removal efficiency of 95%.In the rainwatergreywater dual mode,the addition of carbon sources can improve the capacity of nitrogen removal efficiently,especially for the NO3--N removal.In addition,external added carbon sources can significantly improve the removal efficiency of phosphorus in the bioretention system.However,excessive carbon source will cause the increase in effluent NH4+-N.The addition of carbon source can cause the increase in the effluent COD concentration.Considering the pollutant control target comprehensively,adding 3% sawdust to the medium soil in the submerged area can meet the carbon source demand of the rainwater-greywater dual-mode bioretention system for the treatment of the laundry wastewater from the balcony and the rainfall runoff of the old community.
作者
王维
刘臻
陈垚
冯力柯
陈人瑜
郑薪屿
WANG Wei;LIU Zhen;CHEN Yao;FENG Li-ke;CHEN Ren-yu;ZHENG Xin-yu(Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission,Chongqing Jiaotong University,Chongqing 400074,China;School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《中国农村水利水电》
北大核心
2022年第9期75-82,共8页
China Rural Water and Hydropower
基金
国家自然科学基金项目(51709024)
重庆市青少年创新人才培养雏鹰计划项目(CY200701)
重庆市建设科技计划项目(城科字2020第5-7)
重庆市自然科学基金项目(cstc2020jcyj-msxmX1000,cstc2020jcyj-msxmX0716)。
关键词
生物滞留
雨-灰水
固体碳源
反硝化
有机物淋洗
bio-retention
grey-water-stormwater
solid-state carbon sources
denitrification
organics leaching
