Assessment of the Sludge Reduction of the Metabolic Uncoupler 3,3?,4?,5-tetrachlorosalicylanilide (TCS) in Activated Sludge Culture

Xiaofan Yang, Xiaoping Xu, Xueyu Wei, Jincheng Li and Jie Wan
Additional contact information
Xiaofan Yang: College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 24100, China
Xiaoping Xu: College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 24100, China
Xueyu Wei: College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 24100, China
Jincheng Li: College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 24100, China
Jie Wan: College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 24100, China

IJERPH, 2019, vol. 16, issue 10, 1-10

Abstract: Batch experiments were completed to assess the sludge reduction of the metabolic uncoupler 3,3?,4?,5-tetrachlorosalicylanilide (TCS). The effects of various TCS concentrations on sludge yield were evaluated and the mechanisms associated with sludge reduction were assessed. We discovered that TCS addition resulted in a reduction in sludge. Furthermore, a low dose of TCS (?3 mg/L) resulted in a slight reduction in the efficiency of the wastewater treatment system, while >3 mg/L TCS reduced matrix removal efficiency, with an especially remarkable inhibition effect on ammonia removal. An increase in TCS addition was associated with a gradual decrease in both the electron transport system (ETS) activity and the specific cellular ATP (SATP) in the TCS system. It was demonstrated that TCS plays an important role in metabolic uncoupling. However, with the addition of TCS, both contents and compositions were increased, and the protein content increased more than polysaccharide production in extracellular polymeric substances (EPS). At TCS concentrations of ?3 mg/L, DNA content was stable, but it increased rapidly from 4.97 mg/L to 15.34 mg/L as the TCS concentration was elevated from 6 mg/L to 12 mg/L. This implied that the mechanisms of sludge reduction were different for different TCS concentrations, including uncoupling metabolism, maintenance metabolism and lysis–cryptic growth.

Keywords: sludge reduction; metabolic uncoupler; TCS; ectronic transport system activity; EPS; DNA (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/16/10/1686/pdf (application/pdf)
https://www.mdpi.com/1660-4601/16/10/1686/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:16:y:2019:i:10:p:1686-:d:230962

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().