MA Yue-long,XU Yao-yao,LIU Ning,et al.Treatment Characteristics of Source-separated Urine by SBR/RO Process[J].China Water & Wastewater,2020,36(21 21):7-14.
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Treatment Characteristics of Source-separated Urine by SBR/RO Process

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第36卷 Number: 21 21 Page: 7-14 Column: Date of publication: 2020-11-01
Author(s):
MA Yue-long1; XU Yao-yao1; LIU Ning2; LI Tong-tong1; SHI Xuan1; JIN Xin1; JIN Peng-kang1
(1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2.Petroleum Technology Research Institute of Petrochina Changqing Oilfield Company, Xi’an 710018, China)
Keywords:
urine; source-separation; reverse osmosis; sequencing batch reactor; carbon source
Abstract:
Aiming at the problem of difficulty in reusing urine in source-separated ecological toilets, a combined urine treatment system of sequencing batch reactor (SBR) and reverse osmosis (RO) was designed and developed, and the optimal operating conditions of the coupling SBR/RO process and its removal characteristics of urine pollutants were studied. The nitrification performance of the SBR increased with the increase of the sludge concentration,and pH was the main factor affecting the nitrification performance. Therefore, influence of NH4+-N accumulation generated by the decomposition of urea in SBR on the effluent quality could be avoided by increasing the sludge concentration to 12 g/L and maintaining the pH between 7.0 and 8.0. In order to reduce the reaction time of the denitrification stage, influence of the type and proportion of influent carbon source on removal efficiency of pollutants in urine was analyzed. When mixed carbon source of glucose/sodium acetate (mass ratio 0.73 ∶1) was used, the system had the highest pollutants removal efficiency and the shortest reaction time. Therefore, the influent carbon source was optimized to be a mixed carbon source, and the anoxic and aeration reaction time were adjusted to 1 h and 5 h. The SBR/RO system was continuously operated under the optimal conditions. The removal efficiencies of urea and NH4+-N in the SBR system were more than 99%, and the effluent NO2--N and NO3--N concentrations were stably maintained at 18-33 mg/L and 85-110 mg/L, respectively. The SBR/RO system had a significant effect on the removal of pollutants in urine, and the effluent quality of the system met the flushing water quality standard specified in The Reuse of Urban Recycling Water—Water Quality Standard for Urban Miscellaneous Water Consumption (GB/T 18920-2002).
Last Update: 2020-11-01