WU Jing-yu,ZHANG Ai-jun,DAI Xiao-dong,et al.Application of Flat Sheet Membrane in Leachate Treatment System of Domestic Waste Incineration Plant[J].China Water & Wastewater,2020,36(16 16):126-131.
Application of Flat Sheet Membrane in Leachate Treatment System of Domestic Waste Incineration Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
16 16
Page:
126-131
Column:
Date of publication:
2020-08-17
- Keywords:
- waste leachate; flat sheet membrane; MBR; membrane fouling; chemical cleaning; carbon nitrogen ratio; alkalinity
- Abstract:
- MBR technology is commonly used to treat leachate in domestic waste incineration power plants, however, the flat sheet membrane is seldom used. The design parameters and operation conditions of flat sheet membrane system in the engineering practice of leachate treatment process was described. The actual operation results in the past year showed that the flat membrane could be operated stably in the MBR system under high organic load, high sludge concentration and high alkalinity conditions, and the effluent quality met the design requirements. However, due to the influence of high alkalinity and hardness ions, there was scaling on the membrane surface, resulting in the decrease of membrane flux and the decrease of water production, which required frequent chemical cleaning. Via adjusting the influent ratio of carbon to nitrogen to 4 ∶1 and adding acid solution, the pH in the biochemical tank could be gradually reduced to below 7.5. The result showed that the fouling process on the surface of the flat membrane could be slowed down, and the cleaning frequency could return to normal.
Last Update:
2020-08-17