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Review

Application of Internal Carbon Source from Sewage Sludge: A Vital Measure to Improve Nitrogen Removal Efficiency of Low C/N Wastewater

1
The Institute of International Rivers and Eco-security, Yunnan University, Kunming 650500, China
2
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
3
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Zuorro
Water 2021, 13(17), 2338; https://doi.org/10.3390/w13172338
Received: 22 July 2021 / Revised: 16 August 2021 / Accepted: 24 August 2021 / Published: 26 August 2021
(This article belongs to the Special Issue Carbon Neutrality and Wastewater Treatment)
Biological nitrogen removal from wastewater is widely used all over the world on account of high efficiency and relatively low cost. However, nitrogen removal efficiency is not optimized when the organic matter has inadequate effect for the lack of a sufficient carbon source in influent. Although addition of an external carbon source (e.g., methanol and acetic acid) could solve the insufficient carbon source problem, it raises the operating cost of wastewater treatment plants (WWTPs). On the other hand, large amounts of sludge are produced during biological sewage treatment, which contain high concentrations of organic matter. This paper reviews the emerging technologies to obtain an internal organic carbon resource from sewage sludge and their application on improving nitrogen removal of low carbon/nitrogen wastewater of WWTPs. These are methods that could solve the insufficient carbon problem and excess sludge crisis simultaneously. The recovery of nitrogen and phosphorus from treated sludge before recycling as an internal carbon source should also be emphasized, and the energy and time consumed to treat sludge should be reduced in practical application. View Full-Text
Keywords: internal carbon source; low C/N wastewater; nitrogen removal; resource recovery internal carbon source; low C/N wastewater; nitrogen removal; resource recovery
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MDPI and ACS Style

Wang, H.; Jiang, C.; Wang, X.; Xu, S.; Zhuang, X. Application of Internal Carbon Source from Sewage Sludge: A Vital Measure to Improve Nitrogen Removal Efficiency of Low C/N Wastewater. Water 2021, 13, 2338. https://doi.org/10.3390/w13172338

AMA Style

Wang H, Jiang C, Wang X, Xu S, Zhuang X. Application of Internal Carbon Source from Sewage Sludge: A Vital Measure to Improve Nitrogen Removal Efficiency of Low C/N Wastewater. Water. 2021; 13(17):2338. https://doi.org/10.3390/w13172338

Chicago/Turabian Style

Wang, Huacai, Cancan Jiang, Xu Wang, Shengjun Xu, and Xuliang Zhuang. 2021. "Application of Internal Carbon Source from Sewage Sludge: A Vital Measure to Improve Nitrogen Removal Efficiency of Low C/N Wastewater" Water 13, no. 17: 2338. https://doi.org/10.3390/w13172338

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