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Can phosphorus adsorption clog an alum sludge‐based biofiltration system? Evidence and insight
Author(s) -
Yang Yan,
Wang Jiefu,
Zhao Yaqian,
Tang Cheng,
Liu Ranbin,
Shen Cheng
Publication year - 2021
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6525
Subject(s) - biofilter , clogging , adsorption , phosphorus , chemistry , substrate (aquarium) , pulp and paper industry , environmental engineering , suspended solids , biomass (ecology) , wastewater , environmental chemistry , waste management , environmental science , ecology , archaeology , organic chemistry , biology , engineering , history
Abstract BACKGROUND Aluminium‐based drinking water treatment residual (Al‐DWTR) has been used as an emergent substrate in laboratory‐scale and pilot‐scale biofiltration systems (biofilters and constructed wetlands) for its good affinity for phosphorus (P) adsorption. However, there is a concern about whether the P adsorption process will contribute to substrate clogging. Two laboratory‐scale up‐flow biofiltration systems were set up to identify the contribution of the P adsorption process to clogging under various operation conditions. RESULTS Contributions of individual processes to clogging from biosolids production ( S BS ), inert matter generated from the conversion of residual biomass ( S IS ), P adsorption ( S P ) and inert matter production from influent total suspended solids ( S SS ) during operation of the two systems were assessed. After 262 days of operation, results indicated that S BS contributed most (53.16 ± 7.73%) to the clogging, followed by S SS (41.48 ± 8.02%), S P (3.14 ± 0.06%) and S IS (2.20 ± 0.27%) when treating the influent with concentrations of 284–558 mg L −1 for COD, 54–197 mg L −1 for SS and 5–13 mg L −1 for P. CONCLUSIONS The minor contribution of the P adsorption process to substrate clogging further suggests that dewatered Al‐DWTR with a high P removal capacity is a promising substrate for use in biofiltration systems. © 2020 Society of Chemical Industry (SCI)

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