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| A novel nitrogen and phosphorus inorganic reactor to process rural sewage for safe irrigation |
| Received:February 27, 2017 |
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| KeyWord:rural sewage;nitrogen and phosphorus resources;inorganic nitrogen;inorganic phosphorus;safe irrigation |
| Author Name | Affiliation | E-mail | | ZHOU Chao-qun | School of Energy and Environment, Southeast University, Nanjing 210096, China | | | WU Lei | School of Energy and Environment, Southeast University, Nanjing 210096, China | wulei@seu.edu.cn | | LI Xian-ning | School of Energy and Environment, Southeast University, Nanjing 210096, China | | | HONG Yue-ju | School of Energy and Environment, Southeast University, Nanjing 210096, China | | | ZHANG Jia-jie | School of Energy and Environment, Southeast University, Nanjing 210096, China | |
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| Abstract: |
| In this paper,a novel nitrogen and phosphorus inorganic reactor is designed to remove organic pollutants but to keep the nutrients such as nitrogen and phosphorus in tailwater,for safe irrigation.It works by adjusting the operation parameters of the anaerobic tank and aerobic biofilter combination,which is popular in rural sewage treatment projects because its discharge meets the first level B standard.The experimental data show that its average concentration of COD was under 60 mg·L-1 and the average number of effluent fecal coliform colonies were under 10 000 per litre after rural sewage (influent COD 174~384 mg·L-1,NH4+-N concentration 28.45~97.28 mg·L-1,TN concentration 37~141.9 mg·L-1,TP concentration 3.65~14.57 mg·L-1) had been processed with an optimal HRT=4 h in the anaerobic tank and aerobic biological filter and an optimal HLR=5.4 m3·m-2·d-1 in the novel reactor.The processed rural sewage quality met the requirements for direct irrigation of edible vegetables within the national standards for irrigation water quality (GB 5084-2005).Our results indicate that a novel nitrogen and phosphorus inorganic reactor can be used to realize the safe irrigation using rural domestic sewage. |
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