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2009•China Water & WastewaterRequires access

Study on Modified Vermibiofilter for Treatment of Domestic Sewage

XU Xun-jun

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Abstract

Vermibiofilter,an artificial ecosystem composed of earthworms,microorganisms and substrate,is a new green technology for treatment of domestic sewage.Under the conditions of hydraulic load 0.53 m3/(m2·d),earthworm load 4.63 g earthworm/L soil,and wet/dry ratio 1 ∶5,four kinds of media(soil,sand,gravel and cobble) were utilized in the vermifiltration system to treat domestic sewage.The results show that the vermibiofilter has good treatment efficiency.There is a strong linear relationship between the concentrations of COD,TP and NH+4-N in the influent and the removal load.During the stabilized operation,the removal rates of COD,NH+4-N and TP are 72.92% to 93.33%,72.66% to 99.03% and 59.79% to 96.49% respectively.The technology has advantages of simple process,good treatment efficiency,easy operation and no excess sludge generation.

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What this paper is about

Vermibiofilter,an artificial ecosystem composed of earthworms,microorganisms and substrate,is a new green technology for treatment of domestic sewage.Under the conditions of hydraulic load 0.53 m3/(m2·d),earthworm load 4.63 g earthworm/L soil,and wet/dry ratio 1 ∶5,four kinds of media(soil,sand,gravel and cobble) were utilized in the vermifiltration system to treat domestic sewage.The results show that the vermibiofilter has good treatment efficiency.There is a strong linear relationship between the concentrations of COD,TP and NH+4-N in the influent and the removal load.During the stabilized operation,the removal rates of COD,NH+4-N and TP are 72.92% to 93.33%,72.66% to 99.03% and 59.79% to 96.49% respectively.The technology has advantages of simple process,good treatment efficiency,easy operation and no excess sludge generation.

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Available abstract

Vermibiofilter,an artificial ecosystem composed of earthworms,microorganisms and substrate,is a new green technology for treatment of domestic sewage.Under the conditions of hydraulic load 0.53 m3/(m2·d),earthworm load 4.63 g earthworm/L soil,and wet/dry ratio 1 ∶5,four kinds of media(soil,sand,gravel and cobble) were utilized in the vermifiltration system to treat domestic sewage.The results show that the vermibiofilter has good treatment efficiency.There is a strong linear relationship between the concentrations of COD,TP and NH+4-N in the influent and the removal load.During the stabilized operation,the removal rates of COD,NH+4-N and TP are 72.92% to 93.33%,72.66% to 99.03% and 59.79% to 96.49% respectively.The technology has advantages of simple process,good treatment efficiency,easy operation and no excess sludge generation.

Key concepts: Earthworm, Cobble, Sewage, Sewage treatment, Sewage sludge, Substrate (aquarium), Environmental engineering, Environmental science

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