ZHANGYing,CAOMeng,WANGXiantao,et al.Effects of Salinity Adaptation Strategies on Construction of Nitrogen Removal System for Hypersaline Mustard Tuber Wastewater[J].China Water & Wastewater,2026,42(3):115-121.
Effects of Salinity Adaptation Strategies on Construction of Nitrogen Removal System for Hypersaline Mustard Tuber Wastewater
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第3期
Page:
115-121
Column:
Date of publication:
2026-02-01
- Keywords:
- hypersaline mustard tuber wastewater; salinity adaptation strategy; biological nitrogen removal; system construction; microbial community
- Abstract:
- To address the challenges associated with the construction of biological nitrogen removal systems and the low denitrification efficiency in treating hypersaline mustard tuber wastewater (salinity was 70 g/L, expressed as NaCl), this study investigated the effects of different salinity adaptation strategies on the biological nitrogen removal system construction and the microbial community. The direct increase, daily increase, and phased increase strategies of salinity exerted distinct influences on the startup duration and denitrification performance of hypersaline biological denitrification systems. The corresponding startup periods were 24 days, 49 days, and 66 days, respectively. The removal efficiencies of NH4+-N and TN were 98.35% and 91.15%, 99.13% and 89.89%, and 98.70% and 88.90% under each strategy, respectively. The hypersaline biological nitrogen removal system, established through various salinity adaptation strategies, achieved coordinated nitrification mediated by ammonia?oxidizing archaea (AOA) and nitrifying bacterial genera, including Nitrosococcus, Nitrosomonas, and Nitrospira. Denitrification was simultaneously facilitated by both aerobic and anoxic denitrifying bacterial genera, such as Phaeodactylibacter, Halomonas, Arcobacter, Thiohalobacter, and Thioalkalivibrio. The system established through direct salinity adaptation was more favorable for the enrichment of AOA and aerobic denitrifying functional bacterial genera. The ratio of Arch-amoA to AOB-amoA reached 2.79×103, while the ratio of anoxic denitrification rate to aerobic denitrification rate was 0.94. The direct increase in salinity facilitated the enrichment of indigenous halophilic functional bacteria in mustard tuber wastewater, thereby supporting the rapid establishment and efficient operation of biological nitrogen removal systems for hypersaline wastewater.
Last Update:
2026-02-01