[Objective]The physicochemical properties and greenhouse gas emission characteristics of the soil under different treatment returning modes of wastewater were explored,so as to provide the scientific basis for reducing greenhouse gas emission in farms and utilizing aquaculture wastewater returned to the field.[Method]Four soil column leaching simulation tests,including wastewater direct returning mode(YY),complete anaerobic digestion of wastewater returning mode(ZY),incomplete anaerobic digestion of wastewater returning mode(SH),and complete anaerobic digestion of wastewater storing for 60 days returning mode(CC),were carried out to study the effects on soil physicochemical properties and soil greenhouse gas emissions after 60 days of returning and to screen out the optimum wastewater treatment returning mode.[Result]The soil pH after returning 60 days of YY,ZY and CC increased by 0.82,0.25 and 0.05 compared with CK,respectively.The soil organic matter after returning 60 days of YY,ZY,SH and CC treatments increased by 95.14 g/kg,96.79 g/kg,46.74 g/kg and 40.83 g/kg compared with CK,respectively.The contents of TN,NO4+-N and NO3--N after returning 60 days of the four returning modes increased significantly.The cumulative emission equivalent of greenhouse gas in soil was higher significantly than CK.The total greenhouse gas emission equivalent(CH4,CO2 and N2O)after returning 60 days of YY,ZY,SH and CC were 2 372.57 mg CO2e,1 827.42 mg CO2e,2 583.24 mg CO2e and 520.40 mg CO2e,respectively.[Conclusion]Under the condition that the environment is not polluted and sufficient nutrients can be injected into the soil,the optimal treatment mode is to return aquaculture wastewater to the field under complete anaerobic digestion,which can not only increase soil pH and has the less greenhouse gas emission equivalent,but also achieve the effect of soil fertilization.
wastewater treatmentanaerobic digestionreturning to field after digestionphysical and chemical properties of soilsoil greenhouse gas
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