摘要
为实现河道微污染水体水质净化与行洪排涝双重功能,采用下向流/上向流复合流旁路湿地工艺,设计有机负荷q_(os)=21 kg BOD_(5)/(hm^(2)·d),水力负荷q_(hs)=0.34 m^(3)/(m^(2)·d),水力停留时间HRT=2.2 d,同时为提高冬季低温条件下的湿地系统净化效果,对湿地填料床结构形式、植物组合搭配以及冬季低温运行措施进行了优化,研究表明:1)下向流/上向流复合流功能湿地空间布设灵活,可节约建设占地,通过折流布水,可形成良好的厌氧/缺氧/好氧微生环境,有益于发挥湿地系统的脱氮除磷效果;2)通过增加保温填料覆盖层、采取低温冰下低水位运行、辅以耐低温植物/微生物强化,在冬季低温湿地进水ρ(COD)为30~40 mg/L,ρ(NH_(3)-N)为1.5~2.0 mg/L,ρ(TP)为0.3~0.4 mg/L条件下,实现了3个标段湿地出水平均值ρ(COD)=20.67 mg/L,ρ(NH_(3)-N)=0.77 mg/L,ρ(TP)=0.17 mg/L,基本满足冬季低温条件下的水质设计目标。
In order to realize the dual functions of water purification and flood discharge and drainage in the micro-polluted river,this study constructed a kind of bypass wetland with a downward-upward compound flow process.The main parameters of the project were organic load,hydraulic load and hydraulic retention time,which were 21 kg BOD_(5)/(hm^(2)·d),0.34 m^(3)/(m^(2)·d),2.2 d,respectively.At the same time,the project was optimized by the structure of the wetland packing bed,the plant combination and the low-temperature operation measures in winter.The main conclusions were as follows:1)the downward/upward-flow composite functional wetland had a flexible spatial layout.The construction could save the land,and form a good Anaerobic/Anoxic/Aerobic microbial environment,which is conducive to the removal of nitrogen and phosphorus from the wetland system;2)by adding the covering layer of thermal insulation filler,operating at low water level under low-temperature ice,and strengthening with low temperature-resistant plants/microorganisms,COD concentration,ammonia nitrogen concentration,and total phosphorus concentration of the effluent of the three bidding sections was 20.67 mg/L,0.77 mg/L,0.17 mg/L,under their influent concentration of 30~40 mg/L,1.5~2.0 mg/L and 0.3~0.4 mg/L in winter,basically meeting the water quality design goal under low-temperature conditions in winter.
作者
王文冬
高晓薇
王利军
刘学燕
焦振寰
WANG Wendong;GAO Xiaowei;WANG Lijun;LIU Xueyan;JIAO Zhenhuan(Beijing Institute of Water,Beijing 100048,China;Beijing Changping District Hydrology and Water Quality Monitoring Center,Beijing 102200,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第1期158-163,共6页
Environmental Engineering
关键词
旁路湿地
复合流
低温运行
净水效果
bypass wetland
composite flow
low-temperature operation
water purification effect
