摘要
[目的]探明污水不同模式处理还田后土壤相关理化性质与土壤温室气体排放特征,为减少养殖场温室气体排放、养殖污水生态还田利用提供科学依据.[方法]采用 4种室内土柱淋溶模拟污水还田试验(污水不处理直接还田、污水完全厌氧消化后还田、污水不完全厌氧消化还田、污水完全厌氧消化后存储60d还田),分析还田 60d后对土壤理化性质和土壤温室气体排放的影响,筛选最优污水处理还田模式.[结果]污水直接还田、污水完全厌氧消化还田和污水完全厌氧消化后存储 60d还田处理 60d后土壤pH明显上升,较对照分别上升 0.82、0.25和 0.05;污水直接还田、污水完全厌氧消化还田、污水不完全厌氧消化还田和污水完全厌氧消化后存储 60d还田处理 60d后土壤有机质较对照分别显著提高 95.14 g/kg、96.79 g/kg、46.74 g/kg和40.83 g/kg.污水不同模式处理还田60d后土壤全氮(TN)、铵态氮(NO4+-N)和硝态氮(NO3--N)含量较对照均显著提升;土壤温室气体累积排放当量显著高于对照.污水直接还田、污水完全厌氧消化还田、不完全厌氧消化还田和污水完全厌氧消化后存储 60d还田处理 60d后土壤温室气体(CH4、CO2 和N2O)总排放当量分别为 2 372.57 mg CO2e、1 827.42 mg CO2e、2 583.24 mg CO2e和 520.40 mg CO2e.[结论]在确保环境不受污染且对土壤能够输入足够养分的情况下,养殖污水完全厌氧消化后还田的处理模式最优,既能提高土壤pH,土壤排放温室气体当量较少,又能培肥土壤.
Abstract
[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.
国家科技期刊平台
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