Journal
PROCESS BIOCHEMISTRY
Volume 54, Issue -, Pages 135-139Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2016.12.016
Keywords
Chemically enhanced primary; sedimentation (CEPS); Organic hydrolysis; P removal and recovery; Resource recovery; Sludge fermentation; Wastewater treatment
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Funding
- the Research Grants Council (RGC) of the Hong Kong SAR Government [C7044-14G, 17204914]
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A new chemically enhanced primary sedimentation (CEPS) and sludge fermentation process are developed for improved nutrient removal, energy saving and resource recovery in municipal wastewater treatment. The FeCI3-based CEPS with a dosage of 20 mg-Fe/L can remove 75.6% of organic pollutants and 99.3% of PO4-P on average from wastewater. Under natural fermentation conditions, the CEPS sludge undergoes effective hydrolysis and acidogenesis to produce volatile fatty acids (VFAs) and release phosphate as valuable resources. By using CEPS, around 27% of the organic carbon in wastewater influent can be recovered via sludge fermentation, mainly in the form of VFAs, and about 23% of phosphorus recovered for making vivianite fertilizer. In comparison, both the organic and phosphorus recovery ratios from wastewater are under 10% with conventional primary sedimentation and sludge fermentation. CEPS combined with side-stream sludge fermentation can be readily applied in new treatment plants or in a retrofit of existing treatment systems.(C) 2016 Elsevier Ltd. All rights reserved.
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