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| An efficient trickling filter/landscape biofilter-bed technique for rural domestic sewage treatment |
| Received:November 28, 2019 |
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| KeyWord:rural domestic sewage;efficient trickling filter/landscape biofilter-bed(ETF/LBb);bio-filler;nitrogen and phosphorus adsorption;biofilm formation |
| Author Name | Affiliation | E-mail | | LIU Meng-xue | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China | | | ZENG Fei-fan | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China | | | WEN Hong-ping | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China | | | LIN Xue-ming | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China | | | YANG Xiao-ming | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China | | | REN Zong-ling | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China | | | LI Yong-tao | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Zhen | College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou 510642, China | zzhangal@scau.edu.cn,zhangzhen_23102@163.com |
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| Abstract: |
| It is of utmost importance to effectively treat rural domestic sewage to improve the rural living environment. In the present study, a novel technique, i.e., efficient trickling filter/landscape biofilter-bed (ETF/LBb)was explored through a series of experiments conducted at lab scale, pilot scale (simulated domestic wastewater and treatment capacity of 1 m3·d-1), and finally at large scale (sanitary sewage from student dormitories and treatment capacity of 50 m3·d-1). The lab-scale adsorption and biofilm formation experiments implied that nitrogen- and phosphorus-removal fillers derived from industrial and construction wastes could effectively adsorb nitrogen and phosphorus with maximum adsorption capacities of 1.0 mg N·g-1 and 2.3 mg P·g-1, respectively. Besides, biofilm was significantly formed in the argillaceous limestone-derived filler. In pilot-scale, the modified biofilters containing nitrogen- and phosphorus-removal fillers, as well as argillaceous limestone, could effectively remove CODCr, NH4+, TN, and TP from wastewater with removal efficiencies above 88.9%, 89.9%, 67.8%, and 61.52%, respectively. In the large-scale experiment, the effluent from the ETF/LBb-based sewage treatment chain could effectively meet the stringent national discharge standards (ClassⅠ, Grade A)with the investment below 0.1 yuan·m-3·d-1. It can be concluded that ETF/LBb has promising application prospects in rural areas because of its advantages that include compact space, high treatment efficiency, and labor-saving nature. |
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