摘要
人工湿地是解决工业废水近零排放及资源化的重要方法之一,正被快速推广应用于工业污水厂尾水深度处理。文章构建一处适用于工业污水处理厂高盐尾水深度处理的高负荷潜流人工湿地中试区,利用下部进水廊道及透水滤水板、上部填料及植物的新型构造,采用单因素控制变量法探究不同水力负荷、运行温度和湿地填料下中试湿地对高盐尾水中COD_(Cr)、氨氮、TN和TP去除效果,并初步探究湿地对高盐工业废水中污染物净化机理。结果表明,在水力负荷为常规潜流湿地的1.75~3.50倍时,中试湿地对高盐(Cl^(-)≈1903.6mg/L)、低碳(BOD_(5)/COD_(Cr)≈0.21)、高氮(BOD_(5)/TN≈1.00)化工污水厂尾水的COD_(Cr)、氨氮、TN、TP平均去除率约为14.61%±14.05%、13.78%±32.98%、32.63%±19.89%、13.38%±13.56%。当水力负荷从2.8m^(3)/(m^(2)·d)降低至1.4m/(m^(2)·d)时,湿地对COD_(Cr)去除率从11.69%提升至22.73%。当运行温度从12.21℃升高到22.99℃时,TN、氨氮去除率分别从15.35%、44.89%提高至39.44%、47.68%。吸附性能和离子交换能力更强的沸石填料湿地对TN、氨氮去除率最高,分别达41.90%、21.05%,其次为生物炭、陶粒。生物炭和沸石填料湿地对TP的去除更佳,分别达到21.98%和18.26%。该高负荷潜流湿地对氮磷去除效果较好且单位处理量下占地明显减小,具有一定工程应用价值。
The application of constructed wetland in the advanced treatment of industrial wastewater treatment plant(WWTP)tailwater is being rapidly popularized,which is one of the important methods to solve the near zero emission and recycling of industrial wastewater.A pilot-scale test area of high-load subsurface flow constructed wetland was constructed for advanced treatment of high-salinity tailwater from industrial WWTP.The new type wetland had water inlet gallery and permeable plate at the bottom and different fillers and plants on the top.The single factor control method was used to research the removal effect of COD_(Cr),ammonia nitrogen,TN and TP and preliminary study the mechanism to purify pollutants under different hydraulic loadings,temperatures and fillers.Results showed that the wastewater removal rates of COD_(Cr),ammonia nitrogen,TN and TP were 14.61%±14.05%,13.78%±32.98%,32.63%±19.89%and 13.38%±13.56%when high-load(1.75~3.50 times of usual wetlands)subsurface flow constructed wetland was used to remove the industrial WWTP tailwater with high-salinity(Cl-=1903.6 mg/L),low carbon(BODs/CODα~0.21)and high nitrogen(BODs/TN~1.00).When the hydraulic loading was reduced from 2.8 m/(m?·d)to 1.4 m/(m?·d),the COD_(Cr) removal rate of high-load subsurface flow constructed wetland increased from 11.69%to 22.73%.When the average temperature was increased from 12.21 C to 22.99 C,the removal rates of TN and ammonia nitrogen respectively increased from 15.35%and 44.89%to 39.44%and 47.68%.The removal rates of TN and ammonia nitrogen by zeolite filler wetland were higher(41.90%and 21.05%),because the zeolite had stronger adsorption and ion exchange capacity,followed by biological carbon and ceramsite filler wetland,and the removal rates of TP by biological carbon and zeolite filler wetland were higher(21.98%and 18.26%).The new type of high-load subsurface flow constructed wetland have good removal effects on nitrogen,phosphorus and the land occupation under unit treatment capacity is significantly reduced,which has c
作者
尚文
SHANG Wen*(Tongji Architectural Design<Group>Co.,Ltd.,Shanghai 200092,China)
出处
《净水技术》
CAS
2023年第S01期116-122,共7页
Water Purification Technology
基金
国家重点研发计划(2019YFC0408200)
集团自主立项课题:适用于高盐度工业废水处理的高负荷潜流人工湿地应用技术研究(2019KY15)。
关键词
潜流湿地
高盐尾水
深度处理
近零排放
中试试验
subsurface
flow
constructed wetland
high-salinitytailwater
advanced treatment
near zero emission
pilot-scale test
