Journal
CHEMOSPHERE
Volume 157, Issue -, Pages 224-231Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.05.009
Keywords
Coagulation; Effluent organic matter; Soluble microbial product; Suspended solid; Wastewater treatment plant
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51238001]
- Brook Byers Institute for Sustainable Systems at the Georgia Institute of Technology
- Hightower Chair at the Georgia Institute of Technology
- Georgia Research Alliance at the Georgia Institute of Technology
- Long Term Program in 1000 Talent Plan for High-Level Foreign Experts [WQ20142200209]
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Coagulation is a feasible process to reclaim municipal wastewater, however, the role of coagulation in removing effluent organic matter (EfOM) from underutilized wastewater treatment plants (WWTPs) has not been fully explored. We identified the characteristics of the EfOM from a typical underutilized WWTP (i.e., the ratio of actual capacity to design capacity is 50%-70%), and investigated the performance of coagulation on suspended solids (SS) and dissolved organic matter (DOM) removal. The effluent could even satisfy the highest national standard of China (Class 1 A) for WWTP effluent, as evaluated by the traditional parameters such as SS and chemical oxygen demand (COD). However, the DOM in the EfOM we studied contained considerable biomass-associated products (BAPS), which were dominated by proteins with a molecular weight of approximately 150 kDa. In addition, protein also dominated the DOM after coagulation. Fulvic acid and humic-like acid organics were poorly removed by either AlCl3 or polyaluminum chloride (PAC) coagulation, even with a dosage as high as 24 mg Al L-1. Biodegradability was very poor, as the ratio of biological oxygen demand (BOD5) to COD was less than 0.17. After coagulation the typical BAPs, protein and polysaccharide, remained as high as 1.6 mg L-1 and 1.2 mg L-1 respectively. In this study we found coagulation was ineffective for removal of recalcitrant BAPs. (C) 2016 Elsevier Ltd. All rights reserved.
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