Enhanced nitrogen removal from electroplating tail wastewater through two-staged anoxic-oxic (A/O) process. (January 2018)

• Record Type: Journal Article
• Authors: Yan, Xinmei; Zhu, Chunyan; Huang, Bin; Yan, Qun; Zhang, Guangsheng
• Is Part Of: Bioresource technology. Volume 247(2018)
• Page Start: 157
• Page End: 164
• Publication Date: 2018-01
• Subjects: Electroplating tail wastewater -- Two-staged A/O process -- Nitrogen removal -- Salt-tolerant -- High throughput sequencing analysis; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.09.084
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Two-staged A/O process was applied for depth treatment of electroplating tail wastewater. NH4 + -N and COD removal efficiencies reached 97.11% and 78.75%, respectively. Sludge from two aerobic reactors showed better resistance to high salinity shock. Both salt-tolerant and halophili bacteria were enriched in the combined process. Abstract: Consisted of anaerobic (ANA), anoxic-1 (AN1), aerobic-1 (AE1), anoxic-2 (AN2), aerobic-2 (AE2) reactors and sediment tank, the two-staged A/O process was applied for depth treatment of electroplating tail wastewater with high electrical conductivity and large amounts of ammonia nitrogen. It was found that the NH4 + -N and COD removal efficiencies reached 97.11% and 83.00%, respectively. Besides, the short-term salinity shock of the control, AE1 and AE2 indicated that AE1 and AE2 have better resistance to high salinity when the concentration of NaCl ranged from 1 to 10 g/L. Meanwhile, it was found through high-throughput sequencing that bacteria genus Nitrosomonas, Nitrospira and Thauera, which are capable of nitrogen removal, were enriched in the two-staged A/O process. Moreover, both salt-tolerant bacteria and halophili bacteria were also found in the combined process. Therefore, microbial community within the two-staged A/O process could be acclimated to high electrical conductivity, and adapted for electroplating tail wastewater treatment.