Hydrolysis Combined with Chemically Enhanced Primary Treatment to Remove COD and Retain Nitrogen in Sewage
Publication: Journal of Environmental Engineering
Volume 147, Issue 9
Abstract
In autotrophic nitrogen removal, heterotrophic denitrifiers compete for nitrite/nitrate with autotrophic denitrifiers in the presence of organic matter, leading to a decline in autotrophic denitrifiers. In this study, a combined process of hydrolysis and chemically enhanced primary treatment (CEPT) was used for sewage pretreatment that removed chemical oxygen demand (COD) but reserved total nitrogen (TN). When raw water was hydrolyzed for , approximately 19% of TN was converted to and amino acid in the hydrolysate, resulting in and amino acid accounting for about 75% of TN in raw water. When and bioflocculant were added into the hydrolysate at a final concentration of 40 and , respectively, approximately 70% of COD and approximately 89% of total phosphorus (TP) were removed from the hydrolysate. Finally, approximately 80% of TN in raw water was reserved primarily in the form of and amino acid (), which could be directly or indirectly used for autotrophic nitrogen removal. Combination of bioflocculant and can save 9% of the cost when removes COD from sewage.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the Natural Science Foundation of Tibet [No. XZ 2019 ZR G-38 (Z)], the Natural Science Foundation of Jiangsu Province (BK20180409), Jiangsu Social Development Project (BE2018630), and Wuxi Technology Development Fund (WX18IVJN609). The authors wish to note that Weijia Zhang and Yongze Lu contributed equally to this paper.
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Received: Jan 8, 2021
Accepted: Mar 18, 2021
Published online: Jul 13, 2021
Published in print: Sep 1, 2021
Discussion open until: Dec 13, 2021
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