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Experimental Study on Tower-type Integrated Constructed Wetland for Treatment of Rural Domestic Sewage

Zhu Rui-fen

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Abstract

The treatment efficiency of rural domestic sewage by tower-type integrated constructed wetland was investigated. The results show that the removal efficiencies of COD,NH+4-N,TN and TP are 72%,82%,83% and 63% respectively. The oxygen content of sewage is increased due to the waterfall flow. The amounts of ammonifying bacteria and nitrifying bacteria in the wetland are 107 to 108 CFU/g (soil) and 104 to 105 MPN/g (soil) respectively,which improves the nitrogen removal performance of the wetland. The combined use of woody plants and mat rush in wetland keeps good treatment efficiency of the wetland during winter period.

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What this paper is about

The treatment efficiency of rural domestic sewage by tower-type integrated constructed wetland was investigated. The results show that the removal efficiencies of COD,NH+4-N,TN and TP are 72%,82%,83% and 63% respectively. The oxygen content of sewage is increased due to the waterfall flow. The amounts of ammonifying bacteria and nitrifying bacteria in the wetland are 107 to 108 CFU/g (soil) and 104 to 105 MPN/g (soil) respectively,which improves the nitrogen removal performance of the wetland. The combined use of woody plants and mat rush in wetland keeps good treatment efficiency of the wetland during winter period.

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Available abstract

The treatment efficiency of rural domestic sewage by tower-type integrated constructed wetland was investigated. The results show that the removal efficiencies of COD,NH+4-N,TN and TP are 72%,82%,83% and 63% respectively. The oxygen content of sewage is increased due to the waterfall flow. The amounts of ammonifying bacteria and nitrifying bacteria in the wetland are 107 to 108 CFU/g (soil) and 104 to 105 MPN/g (soil) respectively,which improves the nitrogen removal performance of the wetland. The combined use of woody plants and mat rush in wetland keeps good treatment efficiency of the wetland during winter period.

Key concepts: Wetland, Constructed wetland, Sewage, Environmental science, Nitrifying bacteria, Environmental engineering, Sewage treatment, Nitrification

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