摘要
厕所粪污的资源化利用是我国农村“厕所革命”推进的重要任务,其中尿液的产生量大,氮、磷等养分含量分别占厕所粪污的87%和50%,相对混合粪污更加卫生和易于处理,将其单独处理和利用有利于提高厕所粪污的资源化利用水平。本文采用吸附法开展尿液氮磷回收和水质净化效果研究,通过分析生物炭、活性炭、沸石、瓷砂陶粒、凹凸棒土和混凝土6种不同填料的吸附特性和吸附机理,筛选最佳填料,采用多级填料床工艺,设计7种不同填料组合,分析其对尿液氮磷吸附及水质净化效果。结果表明,填料对氮和磷的吸附均是物理吸附与化学吸附共同作用的结果,其中氮的吸附以官能团作用和离子交换为主,磷的吸附以官能团键合和络合沉淀为主。6种填料中生物炭、活性炭对氮的吸附效果较好,沸石对磷的吸附效果较好。填料依照生物炭、活性炭、沸石顺序排列时,氮磷吸附和水质净化综合效果较好,在此条件下,尿液中氮、磷回收率分别达到76%和90.09%,出水COD和浊度去除率分别为84.36%和78.92%,色度<30,臭味降至2级水平。
The resource utilization of toilet waste is an important task in the promotion of the"toilet revolution"in rural areas of China.Urine is produced in large quantities and contains 87% nitrogen and 50% phosphorus of the nutrients of toilet waste.It is more hygienic and easier to handle than mixed waste,and its separate treatment and utilization are conducive to improving the resource utilization of toilet waste.In this study,the adsorption method was used to study the effect of urine nitrogen and phosphorus recovery and water purification.By analyzing the adsorption characteristics and adsorption mechanisms of six different fillers:biochar,activated carbon,zeolite,porcelain sand vitriol,concave bumpy clay,and concrete,the best filler was selected,and seven different filler combinations were designed using a multi-stage packed bed process to analyze their effects on urine nutrient recovery and water purification.The results showed that the adsorption of nitrogen and phosphorus by the fillers was the result of both physical and chemical adsorption.The adsorption of nitrogen was based on functional group interaction and ion exchange,and the adsorption of phosphorus was based on functional group bonding and complexation precipitation.Among the fillers,biochar and activated carbon had the best adsorption effect on nitrogen,and zeolite had the best adsorption effect on phosphorus.Under this condition,the recovery of nitrogen and phosphorus in urine reached 76% and 90.09%,respectively;the removal of COD and turbidity of effluent were 84.36% and 78.92%,respectively;the color was<30;and odor was reduced to level 2.
作者
杨瑶瑶
王惠惠
沈玉君
丁京涛
贾懿曼
周亚文
李丹阳
YANG Yaoyao;WANG Huihui;SHEN Yujun;DING Jingtao;JIA Yiman;ZHOU Yawen;LI Danyang(Institute of Rural Energy and Environmental Protection,Academy of Agricultural Planning and Engineering,Ministry of Agriculture and Rural Affairs,Beijing 100125,China;College of Resources and Environment,Hebei Agricultural University,Baoding 071001,China;Key Laboratory of Rural Toilet Revolution and Wastewater Management Technology,Ministry of Agriculture and Rural Affairs,Beijing 100125,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2023年第8期1816-1830,共15页
Journal of Agro-Environment Science
基金
农业农村部规划设计研究院自主研发项目(QX202113)。
关键词
尿液
填料
吸附机理
氮磷回收
urine
filler
adsorption mechanism
nitrogen and phosphorus recovery
