Mechanism and the effect of pretreatment of urine during long-term storage process
KANG Sai1,2, LI Qing-xue2, ZHANG Liang-chang3, AI Wei-dang3, GUI Shuang-lin4, ZHENG Li-bing1, LI Chen-lu1, WEI Yuan-song1
1. Department of Water Pollution Control Technology, State Key Joint of Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 2. College of Energy and Environmental Engineering, Hebei University of engineering, Handan 056000, China; 3. National Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Center, Beijing 100094, China; 4. Energy Research Institute of Jiangxi Academy of Sciences, Nanchang 330000, China
Abstract：Urine is characterized by high salinity, complex components, and significant transformationduring long-termstorage process. Therefore, the mechanism of transformation in term ofinorganic substances and organic matters were investigated, and the effect of 3 different pretreatment processes, i.e., acidification by H2SO4, UF by ceramic membrane, and absorption by activated carbon (AC), were studied.It was found that the key process of transformation was urea hydrolysis and the inorganic coprecipitation phenomenon, while the transformation of phosphate precipitation to struvite was found with the increase of ammonia nitrogen concentration from 1365 to 2755mg/L during urine storage. The acidification showed significant urine stabilizationability by inhibiting urea hydrolysis; while ceramic membrane and AC promoted the urea hydrolysis, and AC could effectively adsorb nitrogen. The DOM composition also varied significantly duringthe urine storage process byfluorescence spectrum:the increase of E280/E472, A275~295, E254/E365 and E300/E400 in concentrated H2SO4 pretreatment group showed that the concentration of hydrophobic and small molecular organics of DOM were increased, whilethe decrease of UV254 and A350~400 also confirmed the decrease of aromatic organics. The UF and absorption process showed significant removal efficiency for DOM, however, ceramic membrane showed higher removal efficiency on urea, while the removal rate of aromatic organic compounds was higher by AC. This work systematically elucidatesthe process and mechanismof properties variation during the urine storage process, and demonstrates the influence of pretreatment technologies, which could guide the technical scheme selection for the source-separated urine treatment.
康赛, 李清雪, 张良长, 艾为党, 桂双林, 郑利兵, 李晨璐, 魏源送. 预处理对尿液长期存储过程的影响及机理分析[J]. 中国环境科学, 2021, 41(10): 4597-4605.
KANG Sai, LI Qing-xue, ZHANG Liang-chang, AI Wei-dang, GUI Shuang-lin, ZHENG Li-bing, LI Chen-lu, WEI Yuan-song. Mechanism and the effect of pretreatment of urine during long-term storage process. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4597-4605.
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