ZHANG Jun,SONG Meng-meng,GAO Xing,et al.Design of Saline Wastewater Treatment Process with MVR as Core Treatment Unit[J].China Water & Wastewater,2020,36(24 24):109-114.
Design of Saline Wastewater Treatment Process with MVR as Core Treatment Unit
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
24 24
Page:
109-114
Column:
Date of publication:
2020-12-17
- Keywords:
- saline wastewater; softening; mechanical vapor recompression
- Abstract:
- The wastewater treatment capacity of a chemical plant in Wuxi is about 17 m3/d, which mainly contains calcium, magnesium, copper, ammonium nitrate and other pollutants. According to the characteristics of raw water quality and the needs of enterprises, the detailed comparison of softening and concentration process was carried out, and the whole treatment process with lime + sodium carbonate as the front softening stage, MVR as the core concentration unit and RO as the end treatment stage was established. In the designing process, according to the requirement of ammonium nitrate concentration for recovery of concentrated water and the easy crystallization characteristic of wastewater, MVR compressor was chosen as Roots compressor, and the detailed heat preservation and resistance reduction design of interstage pipeline were carried out. After operation monitoring for half a year, the system operation was stable, management was convenient, the recovery rate of ammonium nitrate was 92.6%, and the total desalination rate was over 99%. More than half of the cost of wastewater treatment was reduced by concentrated recovery of ammonium nitrate wastewater and desalination of condensate water.
Last Update:
2020-12-17