[1]孟元,袁林江,牛雨薇,等.蒸馏法浓缩分离叶酸生产废水效能及参数优化[J].中国给水排水,2023,39(19):109-115.
　MENGYuan,YUANLin-jiang,NIUYu-wei,et al.Distillation Technology for Concentration and Separation of Folic Acid Production Wastewater： Performance and Parameter Optimization[J].China Water & Wastewater,2023,39(19):109-115.
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蒸馏法浓缩分离叶酸生产废水效能及参数优化

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期数: 2023年第19期 页码: 109-115 栏目: 出版日期: 2023-10-01
Title:
Distillation Technology for Concentration and Separation of Folic Acid Production Wastewater： Performance and Parameter Optimization
作者:
孟元1,2,3， 袁林江1,3， 牛雨薇1,3， 王骞1,3， 魏萍1,3， 王茹1,3， 杨睿1,3
（1.西安建筑科技大学 环境与市政工程学院，陕西 西安 710055；2.中联西北工程设计研究院有限公司，陕西 西安 710077；3.西北水资源与环境生态教育部重点实验室，陕西 西安 710055）
Author(s):
MENG　Yuan1，2，3， YUAN　Lin-jiang1，3， NIU　Yu-wei1，3， WANG　Qian1，3， WEI　Ping1，3， WANG　Ru1，3， YANG　Rui1，3
（1. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. China United Northwest Institute for Engineering Design ＆ Research Co. Ltd.， Xi’an 710077， China； 3. Key Laboratory of Northwest Water Resources， Environment and Ecology ， Xi’an 710055， China）
关键词:
叶酸废水;  氨氮;  COD;  高盐分;  减压蒸馏;  参数优化
Keywords:
folic acid wastewater;  NH3-N;  COD;  high salinity;  vacuum distillation;  parameter optimization
摘要:
采用蒸馏法对叶酸生产废水进行浓缩与分离，并优化了工艺参数，比较了蒸馏前后水质的变化，以及pH、温度、压强对冷凝液水质的影响，同时分析了工艺成本。结果表明，COD为10 386 mg/L、氨氮为345 mg/L、总溶解性固体（TDS）为50 000 mg/L的废水在常压、105 ℃条件下蒸馏后，可以回收得到约95%原液体积的冷凝液，其中污染物主要是少量挥发性脂肪酸和氨氮，冷凝液的COD和氨氮浓度仅分别为119和 219 mg/L， TDS<10 mg/L。蒸发过程中，叶酸废水中的复杂有机物部分分解为挥发性脂肪酸和氨氮。事先调节废水pH至6.0，然后在0.07 MPa下进行减压蒸馏，蒸馏体系的温度可以降低至91 ℃，当水的回收率为95%时，总氮和COD浓度分别降低了17.7%和22.7%。原水经滤膜过滤后调节pH至4.5，在0.04 MPa、转速为0条件下蒸馏处理效果最佳，处理后废水的水质满足《污水排入城镇下水道水质标准》（GB/T 31962—2015）规定的市政管网接管标准，工艺运行成本约为26.85 元/m3。
Abstract:
Folic acid wastewater was concentrated and separated through distillation, and then the process parameters were optimized, the wastewater quality before and after distillation were compared, the effects of pH, temperature and pressure on the quality of the condensate were investigated, and the operational cost was analyzed. After distilling wastewater with COD of 10 386 mg/L, ammonia nitrogen of 345 mg/L and total dissolved solids (TDS) of 50 000 mg/L at atmospheric pressure and 105 ℃, the condensate with volume of approximately 95% of the raw liquid could be recovered, in which the pollutants were mainly a small amount of volatile fatty acids and ammonia nitrogen. The COD and ammonia nitrogen in the condensate were only 119 mg/L and 219 mg/L, respectively, and the TDS was less than 10 mg/L. During the evaporation process, the complex organic compounds in the folic acid wastewater were partially decomposed into volatile fatty acids and ammonia nitrogen. The pH of the wastewater was adjusted to 6.0 in advance, and then the temperature of the distillation system was reduced to 91 ℃ at 0.07 MPa. When the recovery rate was 95%, the total nitrogen and COD were reduced by 17.7% and 22.7%, respectively. The optimal distillation performance was obtained when the pH was adjusted to 4.5 after the raw water being filtered by the membrane and the pressure was 0.04 MPa without stirring. The effluent quality met the limit specified in Wastewater Quality Standards for Discharge to Municipal Sewers (GB/T 31962-2015), and the operational cost was approximately 26.85 yuan/m3.

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更新日期/Last Update: 2023-10-01