ZHANGCong-hui,WANGKai,LIUYi-fu,et al.Application of Submerged Combustion Evaporation for RO Concentrated Leachate in a Landfill Site in Chengdu[J].China Water & Wastewater,2024,40(14):119-125.
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Application of Submerged Combustion Evaporation for RO Concentrated Leachate in a Landfill Site in Chengdu

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第14期 Page: 119-125 Column: Date of publication: 2024-07-17
Author(s):
ZHANG　Cong-hui1;  WANG　Kai1;  LIU　Yi-fu2;  YAO　Yuan2;  WANG　Hou-bing2;  SHI　Huan2;  JI　Long-biao1;  LI Qiang2;  CHEN Yu-ting2;  LI　Xiao-xu2
（1. Beijing Symgreen Environmental Technology Group Co. Ltd.， Beijing 100041， China； 2. China Urban Construction Research Institute Environmental Technology Co. Ltd.， Beijing 100120， China）
Keywords:
landfill sites;  waste incineration plant;  reverse osmosis concentrated leachate;  total dissolved solids (TDS);  total nitrogen;  submerged combustion evaporation;  salt accumulation;  full-scale treatment
Abstract:
The concentrated leachate with high total dissolved solids (TDS) and total nitrogen content, as the concentrate after reverse osmosis (RO) membrane treatment to meet the effluent discharge standard, lack of conditions for biological treatment and has been an industry-wide challenge. The present techniques employed domestically are chiefly recirculation and evaporation. A landfill site in Chengdu utilizes submerged combustion evaporation for full treatment of the RO concentrated leachate, and uses direct heat exchange between the high-temperature flue gas and RO leachate to alleviate system scaling. Through the control of reaction conditions such as pH and temperature, the problem of salt accumulation in the leachate system is solved, and the virtuous circle of steady operation of the system is promoted. The steam condenses to effluent water after evaporation is up to the discharge standard. A RO system is also set up for further protection. The effluent quality meets criteria in the table 2 of the Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB 16889-2008). Anaerobic biogas and natural gas have been used as energy sources, which ensures overall high automation, stable operation and up-to- standard effluent quality. According to water production, the power consumption is less than 45 kW·h/m3 and natural gas consumption is about 82 m3/m3.
Last Update: 2024-07-17