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GHG mitigation from sewage effluents: C sequestration after reuse in different urban cropping systems
Carbon Management ( IF 3.1 ) Pub Date : 2020-04-28 , DOI: 10.1080/17583004.2020.1752060
Khajanchi Lal 1 , P. S. Minhas 2 , R. K. Yadav 3 , K. G. Rosin 1
Affiliation  

Large volumes of greenhouse gases (GHGs) are emitted during conventional treatment of sewage. On the other hand, sewage reuse may enhance biomass production, improve soil carbon sequestration and carbon balance. Therefore, the carbon balance in plant biomass and soils was assessed in 8-year long experiment where food grain (FGPS), fodder (FPS), vegetable (VPS) and agro-forestry (AFS) production systems were irrigated either with sewage (SW) or groundwater (GW), along with the application of varying doses of N and P (25–100% of the recommended). The build-up in soil organic carbon (SOC) was 41–69% of that added through SW. The maximum annual increment in SOC occurred with AFS (1.59 Mg ha−1) followed by FPS (1.13 Mg ha−1), VPS (0.89 Mg ha−1) and FGPS (0.77 Mg ha−1). The total carbon stocks accumulated in soils and plant biomass, in terms of CO2 equivalence, were 33.4–39.8, 41.4–45.7, 35.6–41.6 and 14.5–18.4 Mg ha−1 year−1 for FGPS, AGFS, FPS and VPS, respectively, while those accumulated with 50–75% NP under SW irrigation were similar to 100% NP fertilizers under GW. These were equal to the GHGs released daily during conventional treatment of 0.42–1.06, 0.50–1.24, 0.44–1.09 and 0.20–0.48 million liters of sewage.



中文翻译:

减少污水中的温室气体:在不同的城市耕作系统中重复使用后的碳固存

在常规的污水处理过程中会排放大量的温室气体。另一方面,污水回用可以提高生物量的产生,改善土壤碳固存和碳平衡。因此,在长达8年的实验中评估了植物生物量和土壤中的碳平衡,在该实验中,用污水(SW)灌溉了粮食(FGPS),饲料(FPS),蔬菜(VPS)和农林(AFS)生产系统)或地下水(GW),以及施用不同剂量的N和P(建议量的25–100%)。土壤有机碳(SOC)的积累量是通过SW增加的41-69%。SOC的最大年度增量发生在AFS(1.59 Mg ha -1),FPS(1.13 Mg ha -1),VPS(0.89 Mg ha -1)之后)和FGPS(0.77 Mg ha -1)。对于FGPS,AGFS,FPS和VPS,以CO 2当量计,在土壤和植物生物量中累积的总碳储量为33.4–39.8、41.4–45.7、35.6–41.6和14.5–18.4 Mg ha - 1 年-1,分别在西南灌溉条件下累积有50%至75%NP的那些类似于在GW条件下累积了100%NP的肥料。这些等于常规处理期间每天释放的温室气体0.42–1.06、0.50–1.24、0.44–1.09和0.20–48万升污水。

更新日期:2020-04-28
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