单宁酸强化固液分离液态组分对土壤NH3和温室气体排放的影响
Ammonia and greenhouse gas emissions from soil applied with liquid fractions by enhanced solid-liquid separation technology with tannic acid
王珊珊 1崔迎新 1王文静 1白贻超 1韩宇萱 1高志岭1
作者信息
- 1. 河北农业大学,资源与环境科学学院河北省农田生态环境重点实验室,保定,071000
- 折叠
摘要
固液分离技术是当前规模化养殖场液态粪便主要处理技术之一,提高分离效率是推动液态粪便循环利用的有效途径.为探明不同固液分离技术下液态粪肥对土壤温室气体排放的影响,本文以牛粪为试验材料,将固液分离后的液态粪肥进行室内土柱培养试验.试验设置4个处理,分别为不施肥(CK)处理、未分离(RM)处理、常规螺旋挤压(LF)处理、添加单宁酸絮凝后螺旋挤压(LFT)处理.运用静态箱法监测培养期内土壤N2O、CO2和CH4的排放情况,同时采用动态箱法监测土壤NH3的排放情况.结果表明:整个监测期内各处理NH3排放量表现为RM＞LF＞LFT＞CK;N2O排放顺序为LF＞RM＞LFT＞CK.各处理氮素气态损失均表现为NH3-N＞N2O-N,LF和LFT处理(NH3+N2O)-N损失分别占施氮量10.81％和6.84％,且后者显著降低了(NH3+N2O)-N损失.与RM处理相比,LF和LFT处理均显著降低了土壤CH4和CO2排放.与RM处理相比,LF处理显著增加了土壤CO2当量(CO2-e)排放,而LFT处理的土壤CO2-e排放与LF处理相比显著降低了30.00％.常规机械固液分离技术可能有增加液态粪肥农田施用阶段氮素损失和温室气体排放的风险,而添加絮凝剂单宁酸的强化分离技术可以在一定程度上避免该风险,但仍需要深入研究揭示其减排机制并验证田间应用效果.
Abstract
Solid-liquid separation technology is a major practice for the liquid manure management on intensive animal farms,and improving the separation efficiencies of different separation technologies is of importance for enhancing the recycling of liquid animal manure.To investigate the impacts of separated liquid fractions of dairy slurry by different solid-liquid separation technologies on soil greenhouse gas emissions,an indoor incubation of soil column culture experiment was conducted.Four treatments including no fertilization(CK),raw slurry application(RM),application of liquid fraction by screw-press separation(LF),and application of liquid fraction by screw press+tannic acid flocculant(0.5mm screen)(LFT)were set up.The nitrous oxide(N2O),carbon dioxide(CO2)and methane(CH4)emissions of the incubation setup were measured using static chamber technique,and the NH3 emissions were measured using a dynamic chamber technique.The results showed that:(1)the NH3 emission of different treatments was in an order of RM＞LF＞LFT＞CK,and the N2O emission was in an order of LF＞RM＞LFT＞CK during the whole monitoring period.(2)The gaseous nitrogen losses of each treatment were NH3-N＞N2O-N;and the(NH3+N2O)-N of the LF and LFT treatment accounted for 10.81％and 6.84％of the input N,respectively,where the latter significantly reduced(NH3+N2O)-N loss.(3)Compared to the RM treatment,LF and LFT treatments significantly reduced CH4 and CO2 emissions.(4)Compared to the RM treatment,LF treatment significantly increased soil CO2 equivalent(CO2-e)emission,while LFT treatment significantly reduced soil CO2-e emission by 30.00％.In conclusion,conventional mechanical solid-liquid separation technology may increase the risk of nitrogen loss and greenhouse gas emissions during liquid manure application,while such can be avoided to some extent when the conventional separation technology is combined with the use of tannic acid as flocculant.However,further research is needed to reveal its emission reduction mechanism of the screw press+tannic acid flocculent technology and to verify the mitigation in fields.
关键词
液态粪肥/固液分离技术/单宁酸/氨气/温室气体Key words
liquid manure/solid-liquid separation technology/tannic acid/ammonia/greenhouse gas引用本文复制引用
基金项目
河北省重点研发项目(21327303D)
河北省重点研发项目(20327306D)
出版年
2024
NETL
NSTL
万方数据