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| Regulation of membrane pore size to nutrient and pollutant enrichment during ultrafiltration concentration of biogas slurry |
| Received:January 15, 2023 |
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| KeyWord:ultrafiltration;biogas slurry;membrane pore size;membrane concentration;nutrient;risk contaminant |
| Author Name | Affiliation | E-mail | | WANG Yongfang | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | CUI Wenjing | Qingdao Agricultural University, College of Resources and Environment, Qingdao 266109, China | | | LIU Wancen | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | XIA Ruohan | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | CAO Dingge | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environment, China Agricultural University, Beijing 100193, China
Organic Recycling Research Institute(Suzhou) of China Agricultural University, Suzhou 215100, China | | | DING Xiangrui | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environment, China Agricultural University, Beijing 100193, China
Organic Recycling Research Institute(Suzhou) of China Agricultural University, Suzhou 215100, China | | | LI Guoxue | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environment, China Agricultural University, Beijing 100193, China
Organic Recycling Research Institute(Suzhou) of China Agricultural University, Suzhou 215100, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | LUO Wenhai | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environment, China Agricultural University, Beijing 100193, China
Organic Recycling Research Institute(Suzhou) of China Agricultural University, Suzhou 215100, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | luowenhai@cau.edu.cn |
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| Abstract: |
| To determine an ultrafiltration (UF) membrane with a suitable pore size to exhibit low fouling propensity and high contaminant retention, UF membranes with membrane pore sizes of 500, 100, 50 KD, and 30 KD (average membrane pore sizes of 20, 6, 4 nm, and 3 nm, respectively) were selected for the concentration of chicken manure biogas slurry. The results showed that water flux was reduced by 38%-49% with three notable stages:rapid decrease, stabilization, and further decrease. Such a flux reduction was more notable for the UF membrane with low pore size. Although the effects of UF membrane pore size on the retention of organic matter in biogas slurry were insignificant, nutrients, such as total phosporous, total nitrogen, and total potassium, were more effectively rejected with a gradual decline in membrane pore size. Similarly, the four UF membranes exhibited similar retention for medium and trace elements, including Ca, Mg, Fe, and Zn. Nevertheless, the retention of heavy metals and antibiotics by the UF membrane increased in response to reduced pore sizes. In particular, Cu and Pb were almost entirely retained by the four UF membranes. Based on the stable water flux, nutrient retention, and contaminant enrichment, the membrane pore size of 100 KD was preferable for the concentration of biogas slurry. |
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