猪场沼液的卷式反渗透膜浓缩试验研究
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摘要
沼液的养分浓缩和体积的减量化是其高效利用的前提。研究了不同条件下反渗透膜对预处理后沼液的浓缩效果,比较了不同反渗透膜操作压力、沼液初始pH值、沼液温度以及不同体积浓缩倍数对沼液浓缩的影响及规律。在此基础上,通过正交试验综合考虑体积浓缩速率、主要养分浓度和养分截留率,得出最适宜的反渗透膜浓缩条件为:操作压力为3500 k Pa、沼液温度为35℃,初始pH值为5. 0。
The nutrient concentration and volume reduction of the biogas slurry are preconditions of the high value utilization of biogas slurry. This paper investigated the effect of reverse osmosis membrane on pretreated biogas slurry concentration under different conditions,and the influence of different operation pressure of reverse osmosis membrane,initial pH value of the biogas slurry,biogas slurry temperature and volume concentration multiple of biogas slurry and their laws were compared. On this basis,orthogonal experiments were carried out. Taking the volume concentration rate,main nutrient concentration and nutrient retention rate into account,the optimum conditions for reverse osmosis membrane were as follows: operating pressure of3500 k Pa,temperature of biogas slurry of 35 ℃,initial pH value of biogas slurry of 5. 0.
The nutrient concentration and volume reduction of the biogas slurry are preconditions of the high value utilization of biogas slurry. This paper investigated the effect of reverse osmosis membrane on pretreated biogas slurry concentration under different conditions,and the influence of different operation pressure of reverse osmosis membrane,initial pH value of the biogas slurry,biogas slurry temperature and volume concentration multiple of biogas slurry and their laws were compared. On this basis,orthogonal experiments were carried out. Taking the volume concentration rate,main nutrient concentration and nutrient retention rate into account,the optimum conditions for reverse osmosis membrane were as follows: operating pressure of3500 k Pa,temperature of biogas slurry of 35 ℃,initial pH value of biogas slurry of 5. 0.
引文
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[3]陈玉成,杨志敏,陈庆华,等.大中型沼气工程厌氧发酵液的后处置技术[J].中国沼气,2010,28(1):14-20.
[4]梁康强,阎中,魏泉源,等.沼气工程沼液高值的利用研究[J].中国农学通报,2012,28(32):198-203.
[5] Lin X,Han Z,Yu H,et al. Struvite precipitation from biogas digestion slurry using a two-chamber electrolysis cell with a magnesium anode[J]. Journal of Cleaner Production,2018(10):174.
[6] Chiumenti A,Da B F,Chiumenti R,et al. Treatment of digestate from a co-digestion biogas plant by means of vacuum evaporation:tests for process optimization and environmental sustainability[J].Waste Management,2013,33(6):1339-1344.
[7] Ruan H,Yang Z,Lin J,et al. Biogas slurry concentration hybrid membrane process:pilot-testing and RO membrane cleaning[J].Desalination,2015,368:171-180.
[8] Lindmark J,Thorin E,Kastensson J,et al. Membrane filtration of process water at elevated temperatures:a way to increase the capacity of a biogas plant[J]. Desalination,2011,267(2):160-169.
[9]徐国锐.沼液纳滤膜浓缩技术及其液体有机肥开发研究[D].杭州:浙江大学,2012.
[10]梁康强,阎中,朱民,等.沼气工程沼液反渗透膜浓缩应用研究[J].中国矿业大学学报,2011,40(3):470-475.
[11]魏欢欢.基于反渗透法浓缩分离沼液试验研究[D].沈阳:沈阳农业大学,2016.
[12]程宇.混凝—吸附工艺对养猪废水处理效果的研究[D].武汉:华中农业大学,2017.
[13]何红根. UF+DTRO膜处理垃圾渗滤液的研究[D].武汉:武汉理工大学,2007.
[14]杨座国.膜科学技术过程与原理[M].上海:华东理工大学出版社,2009.
[15]董廷尉,戴海平,范云双.膜前预处理技术在饮用水处理中的研究进展[J].天津工业大学学报,2009,28(6):26-31.
[16]毛金刚.超滤—纳滤膜耦合处理养猪废水技术研究[D].杭州:浙江农林大学,2014.
[17]宋成芳,单胜道,张妙仙,等.畜禽养殖废弃物沼液的膜过滤浓缩试验研究[J].中国给水排水,2011,27(3):84-86.
[18]王晓琳,丁宁.反渗透和纳滤技术与应用[M].北京:化学工业出版社,2005.