期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 31, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2019.100846
关键词
Sludge; NF; UF; Phosphate; Nitrogen; AD
资金
- SUPERPHA-Systems and Product Engineering Research
- ERDF
- Welsh Government
- European Regional Development Fund (ERDF) of the European Union, in Swansea University
Anaerobic Digester (AD) waste, known as digestate (spent anaerobically digested effluents) of agricultural origin, was collected for a feasibility study on the use of membrane filtration to fractionate phosphate and ammonia from digestate into nutrient streams. The digestate was pre-treated to remove bulk solids and then filtered using diafiltration (DF) with ultrafiltration (UF) (5.65 psi TMP) and then nanofiltration (NF) (operating pressure 253.82 psi). Having set the pre-treated effluents at pH 4.0, retention of phosphate reached 6.78 mmols L-1 during UF with lower values being achieved with repeated DF steps. In contrast, nitrogen retention was lower at 8.21 mmols L-1 and was continuously dropping at each DF step. During NF phosphorus was shown to be strongly retained by the membrane at 31.8 mmols L-1, while retention of ammonium was low at 13.4 mmols L-1 demonstrating the potential for this combination of membrane types for fractionating high value components from AD waste.
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