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| Effects and mechanism of multi-stage packed beds on synergistic water purification of urine nutrient adsorption |
| Received:March 31, 2023 Revised:May 19, 2023 |
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| KeyWord:urine;filler;adsorption mechanism;nitrogen and phosphorus recovery |
| Author Name | Affiliation | E-mail | | YANG Yaoyao | 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 | | | WANG Huihui | Institute of Rural Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Rural Toilet Revolution and Wastewater Management Technology, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | SHEN Yujun | Institute of Rural Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Rural Toilet Revolution and Wastewater Management Technology, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | DING Jingtao | Institute of Rural Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Rural Toilet Revolution and Wastewater Management Technology, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | JIA Yiman | Institute of Rural Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Rural Toilet Revolution and Wastewater Management Technology, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | jiayimansw@163.com | | ZHOU Yawen | Institute of Rural Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Rural Toilet Revolution and Wastewater Management Technology, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | LI Danyang | Institute of Rural Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
1. Institute of Rural Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | |
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| Abstract: |
| 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. |
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