LIZhong-qiang,LUOQian,HUANGHui-min,et al.Anaerobic Granular Sludge for Efficient Denitrification Treatment of High Salinity Resin Regeneration Liquid[J].China Water & Wastewater,2024,40(7):19-26.
Anaerobic Granular Sludge for Efficient Denitrification Treatment of High Salinity Resin Regeneration Liquid
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第7期
Page:
19-26
Column:
Date of publication:
2024-04-01
- Keywords:
- resin regeneration liquid; granular sludge; denitrification; high salinity; microbial community
- Abstract:
- To address the problem of handling high-salinity regeneration liquid generated from the ion exchange resin regeneration process, anaerobic granular sludge was inoculated in an upflow sludge bed reactor. A continuous inflow method was adopted to gradually increase the inflow NO3--N load and salinity to domesticate the sludge. The operational parameters of the reactor were optimized to achieve the optimal salinity of 2.0%, hydraulic retention time (HRT) of 12 hours, carbon-to-nitrogen ratio (C/N) of 3.3, and upflow velocity of 1.5 m/h. Under these conditions, the TN removal rate reached over 90%, the effluent TN was below 10 mg/L, and the combined effluent TN from the ultimate denitrification and regeneration liquid treatment was less than 1.5 mg/L, meeting the surface water class Ⅳ standard. The treatment cost was 0.587 yuan/m3. Scanning electron microscopy and high-throughput sequencing were performed on the granular sludge during different stages of operation. The number of filamentous bacteria on the sludge surface increased significantly, and the proportion of Proteobacteria increased over time, with denitrifying bacteria gradually becoming dominant. The developed technique is economical and efficient, and provides an option for the treatment of high-salinity regeneration liquid.
Last Update:
2024-04-01