酸化处理对猪场原水和沼液存储过程中气体排放的影响

发布时间：2017-12-31 03:22

本文关键词：酸化处理对猪场原水和沼液存储过程中气体排放的影响　出处：《农业环境科学学报》2016年04期 　论文类型：期刊论文

【摘要】：为探索酸化处理对猪场原水和沼液存储过程中温室气体(CH_4、N_2O、CO_2)以及NH_3排放的影响,采用浓硫酸酸化处理猪场污水,利用动态箱法在线监测存储75 d内各气体排放通量。试验分别设置一个对照组和两个酸化处理组:原水对照组p H为6.5(RCK),加酸处理后p H分别为5.1(RT1)和5.7(RT2);沼液对照组p H为7.8(BCK),加酸处理后p H分别为5.7(BT1)和6.5(BT2)。对于原水组,RCK、RT1、RT2的CH4排放通量分别为32.2、2.37、3.10 g·m~(-3)·d~(-1),N_2O排放通量分别为336.45、23.36、29.79 mg·m~(-3)·d~(-1),NH_3排放通量分别为1.01、0.82、1.63 g·m~(-3)·d~(-1),CO2排放通量分别为109.14、99.66、110.55 g·m~(-3)·d~(-1),酸化处理显著降低原水CH_4和N_2O排放量;对于沼液组,BCK、BT1、BT2的CH_4排放通量分别为0.24、0.86、0.63 g·m~(-3)·d~(-1),N_2O排放通量分别为2.54、73.43、268.66mg·m~(-3)·d~(-1),NH_3排放通量分别为8.02、1.35、1.51 g·m~(-3)·d~(-1),CO_2排放通量分别为48.9、44.3、44.0 g·m~(-3)·d~(-1),酸化沼液显著增加CH_4和N_2O排放通量,但NH3排放可显著降低81%~83%,同时酸化组内氨氮含量较对照组增加40%~54%。根据CH_4和N_2O在100年尺度上的全球增温潜势计算各组的综合温室效应,猪场原水酸化后CO_2-eq降低91%~92%,沼液酸化后温室气体增加5~11倍。结果表明:酸化处理原水能够有效降低温室气体排放,而酸化处理沼液则一定程度上增加了温室气体排放,但可有效降低NH_3排放,同时保留沼液中氮养分。
[Abstract]:In order to explore the effect of acidification treatment on greenhouse gas CH4N2OCO2) and NH_3 emission during storage of raw water and biogas liquid from pig farm, the wastewater from pig farm was treated with concentrated sulfuric acid acidification. The flux of each gas was monitored by dynamic tank method for 75 days. One control group and two acidizing treatment groups were set up respectively: the pH of raw water control group was 6.5? After adding acid, pH was 5.1 ~ (-1) and 5.7 ~ (~ (2)) ~ (-1); The pH of the biogas liquid control group was 7.8m BCK1, and the pH of the treated group was 5.7g / BT1 and 6.5g / BT2 respectively. For the raw water group, RCKP / RT1 was obtained. The emission fluxes of CH4 of RT2 were 32.2 ~ 2.37 ~ 3.10 g 路m ~ (-3) 路d ~ (-1) ~ (-1) N _ 2O emission flux of 336.45% ~ 23.36, respectively. The NH3 emission fluxes were 1.01 ~ 0.82 卤1.63 g 路m ~ (-3) 路d ~ (-1) 路d ~ (-1) 路d ~ (-1) 路d ~ (-1) ~ (-1) 路d ~ (-1) ~ (-1) 路d ~ (-1) ~ (-1) 路d ~ (-1) ~ (-1), respectively. The emission flux of CO2 was 109.14 ~ 99.66 ~ 110.55 g 路m ~ (-1) 路m ~ (-1) 路m ~ (-1) 路m ~ (-1) 路m ~ (-1) 路m ~ (-1) 路m ~ (-1) 路m ~ (2 +) ~ (-1), respectively. The CH_4 fluxes of BT1 / BT2 in biogas waste group were 0.24 ~ 0.86 ~ 0.63 g 路m ~ (-1) 路d ~ (-1) ~ (-1), respectively. The N2O emission fluxes were 2.54 ~ 73.43 ~ 268.66 mg 路m ~ (-3) 路d ~ (2 +) ~ (-1) and NH _ (3) emission fluxes were 8.02 ~ (-1) ~ 1.35, respectively. The emission fluxes of 1.51 g 路m ~ (3) 路d ~ (-1) ~ (-1) C _ (2) were 48.9g 路m ~ (-1) ~ (-3) 路d ~ (-1) ~ (-1) ~ (-1), respectively, and the emission fluxes were 44.3g 路m ~ (-1) ~ (-1). Acidified biogas liquid significantly increased the flux of CH_4 and N2O, but the emission of NH3 decreased by 81% and 83%. At the same time, the ammonia nitrogen content in the acidified group was increased by 40% and 544.The total Greenhouse Effect of each group was calculated according to the global warming potential of CH_4 and N2O on a 100-year scale. The CO_2-eq of raw water in pig farm decreased by 91% and 92% after acidification, and the greenhouse gas increased by 5 ~ 11 times after acidification of biogas liquid. The results showed that acidified raw water could effectively reduce greenhouse gas emissions. However, acidification treatment increased greenhouse gas emissions to some extent, but effectively reduced NH_3 emissions, while retaining nitrogen nutrients in the biogas.
【作者单位】：农业部设施农业节能与废弃物处理重点实验室中国农业科学院农业环境与可持续发展研究所;
【基金】：公益性行业科研专项(201103039,201303091) 973课题(2012CB417104)
【分类号】：X713
【正文快照】： 畜禽粪便是重要的温室气体排放源之一,根据《中华人民共和国气候变化第二次国家信息通报》,2005年动物粪便管理过程排放的N2O、CH4分别为26.6万t、286.4万t,分别占农业N2O、CH4排放量的28.4%和11.4%[1]。在动物粪便管理过程中,除了产生CH4、CO2、N2O等温室气体外,还会产生NH3

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