Effects of transient 3-chloroaniline shock loading on the performance, microbial community and enzymatic activity of sequencing batch reactor. (15th March 2020)

• Record Type: Journal Article
• Authors: Ma, Bingrui; Zhao, Changkun; Li, Shanshan; Gao, Mengchun; She, Zonglian; Yu, Naling; Guo, Liang; Zhao, Yangguo; Jin, Chunji
• Is Part Of: Journal of environmental management. Volume 258(2020)
• Publication Date: 2020-03-15
• Subjects: Chloroaniline -- Sequencing batch reactor -- Shock loading -- Enzymatic activity -- Microbial community; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2019.110017
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Chloroanilines from industrial wastewater can produce adverse effects on biological wastewater treatment systems due to their potential biotoxicity. The performance, nitrogen removal rate, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were evaluated under transient 3-chloroaniline shock loading. After 40 mg/L 3-chloroaniline shock loading of 24 h on day 9, the chemical oxygen demand (COD) removal efficiency decreased from 90.71% on day 8 to 80.57% on day 11, and the NH4 + -N removal efficiency reduced from 98.96% on day 8 to 35.51% on day 12. Subsequently, the COD and NH4 + -N removal efficiencies gradually recovered to normal value. Compared with the absence of 3-chloroaniline shock loading, the ammonia-oxidizing rate (SAOR), nitrite-oxidizing rate (SNOR), nitrite-reducing rate (SNIRR) and nitrate-reducing rate (SNRR) decreased by 66.19%, 14.49%, 16.20% and 49.38% on day 11, respectively, and then they gradually recovered to normal value. The SAOR, SNOR, SNIRR and SNRR displayed the similar varying trends to the activities of ammonia monooxygenase, nitrite oxidoreductase, nitrite reductase and nitrate reductase, respectively. The appearance of 3-chloroaniline promoted the microbial reactive oxygen species production and lactate dehydrogenase release. The transient 3-chloroaniline shock loading distinctly impacted the microbial richness and diversity. The present research results can provide theoretical basis and technical support for evaluating the effects of transient 3-chloroaniline shock on biological wastewater treatment systems, which is beneficial to take reasonable preventable measures to decrease the adverse effects on the bioreactor performance. Highlights: The NH4 + -N and COD removal sharply reduced under transient 3-chloroaniline shock. The transient 3-chloroaniline shock temporally inhibited the nitrogen removal rate. The transient 3-chloroaniline shock promoted the ROS production and LDH release. The transient 3-chloroaniline shock obviously affected the microbial community. The SBR performance gradually recovered after the transient 3-chloroaniline shock.