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。
This study aimed to investigate the emissions of greenhouse gases（CH4, N2 O and CO2）and ammonia from acidified raw pig slurry and biogas liquid during their storages. Dynamic flux chamber method was used to continuously monitor gaseous emissions during a 75-day storage period. One control and two treatment groups were tested. For raw pig slurry, its p H was 6.5 in control group（RCK）while 5.1（RT1）and 5.7（RT2）in the treatment groups. For biogas liquid, p H in control was 7.8（BCK）, but 5.7（BT1）and 6.5（BT2）in two treatments. The average daily gas emission rates in RCK, RT1, and RT2 were 32.2, 2.37, and 3.10 g CH4·m-3·d-1, 336.45, 23.36, and 29.79 mg N2O·m-3·d-1,1.01, 0.82, and 1.63 g NH3·m-3·d-1, 109.14, 99.66, and 110.55 g CO2·m-3·d-1, respectively. Those of BCK, BT1, and BT2 were 0.24, 0.86,and 0.63 g CH4·m-3·d-1, 2.54, 73.43, and 268.66 mg N2O·m-3·d-1, 8.02, 1.35, and 1.51 g NH3·m-3·d-1, 48.9, 44.3, and 44.0 g CO2·m-3·d-1,respectively. For biogas liquid, acidification significantly increased CH4 and N2O emissions, but reduced NH3 emissions by 81% to 83%,while increased NH＋4 by 40% to 54%, compared with the control. Based on 100-year global warming potentials（GWPs）of CH4 and N2O, total GHG（GHGs=CH4＋N2O）emissions were reduced by 91% to 92% by acidifying raw pig slurry, whereas acidification increased total GHG emissions by 5 to 11 times for biogas liquid. These results show that the acidification significantly reduces GHG emissions from raw slurry,but increases GHG emissions from biogas liquid to some extent, whereas acidification significantly alleviates NH3 emissions and conserves the N content in biogas liquid.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2016年第4期774-784,共11页
Journal of Agro-Environment Science
基金
公益性行业科研专项(201103039
201303091)
973课题(2012CB417104)
