期刊
WATER RESEARCH
卷 143, 期 -, 页码 136-145出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.06.043
关键词
Recharge; Al-coagulant; Biomass; Clogging; Quartz sand dissolving
资金
- National Natural Science Foundation of China [51722803, 51578117, 51508079]
- Fundamental Research Funds for the Central Universities [2412018QD021]
- Long Term Program in 1000 Talent Plan for High-Level Foreign Experts [WQ20142200209]
- Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection
- Brook Byers Institute for Sustainable Systems
- Hightower Chair
- Georgia Research Alliance at the Georgia Institute of Technology
The recharge of reclaimed water is an effective strategy for addressing the issues of water quality deterioration and groundwater level decline simultaneously. Residual Al coagulants are normally remained in the recovered water at low concentrations, and may induce clogging problems during the recharging process. However, this issue has been ignored in the past. In this study, we investigated the mechanisms of Al(III)-induced aquifer bio-clogging, the role of Al(III) in quartz sand media (SiO2) dissolution and re-precipitation in the series of aquifer columns. We determined that Al(III) resulted in serious clogging in similar to 140 h at low concentrations that satisfied the national drinking water standard of China. The corresponding hydraulic conductivity decreased by more than similar to 90% in the bacteria-containing aquifer, which was similar to 30% greater than that for the bacteria-free trials. The enhanced Al(III)-related clogging was caused by modifying quartz sand to form Si-O-Al(OH)n and improving microbes attachment. Microbes retention kinetic coefficients (k) of the Al recharged simulated aquifer could increase by 3.0-8.3 times. The Al(III) also enhanced biomass production and clogging by binding to microbial extracellular polymeric substances. In turn, the greater amount of biomass accelerated the Si dissolution and re-precipitation, this may potentially damage the stability of aquifer structure. The results showed that reclaimed water treated with Al coagulation should be employed with caution for recharging. (C) 2018 Elsevier Ltd. All rights reserved.
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