Characteristics of CO_2, CH_4 and N_2O emissions from a multi-soil-layering system during wastewater treatment(Environment)

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In the present study, characterization of greenhouse gas emissions, such as CO_2, CH_4 and N_2O, from a multi-soil-layering (MSL) system during wastewater treatment was conducted, using a laboratory scale system (width 50×depth 10×height 120cm). Net fluxes of CO_2, CH_4 and N_2O from the system were in the range of 21.2-48.0g m^<-2> day^<-1>, -66.4-0.02mg m^<-2> day^<-1> and 41-246mg m^<-2> day^<-1>, respectively. Carbon dioxide emission generally increased as the air temperature increased. The net flux of CO_2 was not appreciably different among the treatments, even though the hydraulic loading rates (HLR) differed widely. These findings indicated that the decomposition of organic matter loaded through wastewater was more efficient in the low HLR treatments. Mean CH_4 emission was lower than the amount of CH_4 brought by the influent. Methane was consumed in the MSL system during most of the study period, and the consumption tended to be more efficient in the treatments at high HLRs. Wastewater quality was not markedly related to the characteristics of the CO_2 and CH_4 emissions. Nitrous oxide was mainly released into the treated water as dissolved gas. Nitrous oxide emission per 1,000L of wastewater decreased as the HLRs increased in the wastewater containing a high level of contaminants (HWW), while in the case of wastewater containing a low level of contaminants (LWW), such a decrease in the emission was not observed. Mean N_2O conversion rates of the LWW treatments ranged from 1.10 to 1.79% and were higher than those of the HWW treatments, which ranged from 0.19 to 1.95%. Nitrous oxide emission could be reduced in the HWW treatments.
社団法人日本土壌肥料学会の論文

Characteristics of CO_2, CH_4 and N_2O emissions from a multi-soil-layering system during wastewater treatment(Environment)

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