Study on anti-scaling of landfill leachate treated by evaporation method

In the mechanical vapor recompression (MVR) treatment of landfill leachate, scaling in the evaporator and heat exchanger poses a serious problem. This study explored the reasons for such scaling and proposed acid or ion-exchange pre-treatments to reduce the alkalinity of the landfill leachate nanofi...

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Autores principales:	Zhongteng Bai, Yanqiu Wang, Mingjun Shan, Yanli Lv, Guangcai Meng, Siwei Zhu, Dawei Pan
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	acid pre-treatment anti-scaling ion-exchange pre-treatment landfill leachate mvr evaporation process nanofiltration concentrate Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/6128ade9f4ee4d90a003654390efba99
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spelling	oai:doaj.org-article:6128ade9f4ee4d90a003654390efba992021-11-06T11:11:45ZStudy on anti-scaling of landfill leachate treated by evaporation method0273-12231996-973210.2166/wst.2021.210https://doaj.org/article/6128ade9f4ee4d90a003654390efba992021-07-01T00:00:00Zhttp://wst.iwaponline.com/content/84/1/122https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732In the mechanical vapor recompression (MVR) treatment of landfill leachate, scaling in the evaporator and heat exchanger poses a serious problem. This study explored the reasons for such scaling and proposed acid or ion-exchange pre-treatments to reduce the alkalinity of the landfill leachate nanofiltration concentrate (LLNC) to prevent scaling. The feasibility of these two methods was evaluated and the technical and economic parameters for application were obtained via experiments. A large amount of HCO3- in the LLNC was the main cause of scaling. The acid addition experiment and field application demonstrated that this method could prevent fouling problems. The cost of acid addition was USD 0.18/t. LLNC pre-treatment by ion-exchange showed that a weakly acidic cation-exchange resin performed better than a strongly acidic cation-exchange resin did. The amount of solid residue under an alkalinity of 0 mg/L could be decreased by 92.9% compared with that of raw LLNC during evaporation. Both methods could alleviate scaling and enable the wide application of the MVR evaporation process in landfill leachate treatment. Highlights The key cause for fouling of MVR is the presence of a mass of bicarbonate in the LLNC.; After treatment, the residual solids generated during evaporation will reduce by 92.9%.; Hydrochloric acid pre-treatment is a cost-effective way to prevent scale.; Weak acid ion-exchange pre-treatment can prevent scale without introducing other ions.;Zhongteng BaiYanqiu WangMingjun ShanYanli LvGuangcai MengSiwei ZhuDawei PanIWA Publishingarticleacid pre-treatmentanti-scalingion-exchange pre-treatmentlandfill leachatemvr evaporation processnanofiltration concentrateEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 1, Pp 122-134 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	acid pre-treatment anti-scaling ion-exchange pre-treatment landfill leachate mvr evaporation process nanofiltration concentrate Environmental technology. Sanitary engineering TD1-1066
spellingShingle	acid pre-treatment anti-scaling ion-exchange pre-treatment landfill leachate mvr evaporation process nanofiltration concentrate Environmental technology. Sanitary engineering TD1-1066 Zhongteng Bai Yanqiu Wang Mingjun Shan Yanli Lv Guangcai Meng Siwei Zhu Dawei Pan Study on anti-scaling of landfill leachate treated by evaporation method
description	In the mechanical vapor recompression (MVR) treatment of landfill leachate, scaling in the evaporator and heat exchanger poses a serious problem. This study explored the reasons for such scaling and proposed acid or ion-exchange pre-treatments to reduce the alkalinity of the landfill leachate nanofiltration concentrate (LLNC) to prevent scaling. The feasibility of these two methods was evaluated and the technical and economic parameters for application were obtained via experiments. A large amount of HCO3- in the LLNC was the main cause of scaling. The acid addition experiment and field application demonstrated that this method could prevent fouling problems. The cost of acid addition was USD 0.18/t. LLNC pre-treatment by ion-exchange showed that a weakly acidic cation-exchange resin performed better than a strongly acidic cation-exchange resin did. The amount of solid residue under an alkalinity of 0 mg/L could be decreased by 92.9% compared with that of raw LLNC during evaporation. Both methods could alleviate scaling and enable the wide application of the MVR evaporation process in landfill leachate treatment. Highlights The key cause for fouling of MVR is the presence of a mass of bicarbonate in the LLNC.; After treatment, the residual solids generated during evaporation will reduce by 92.9%.; Hydrochloric acid pre-treatment is a cost-effective way to prevent scale.; Weak acid ion-exchange pre-treatment can prevent scale without introducing other ions.;
format	article
author	Zhongteng Bai Yanqiu Wang Mingjun Shan Yanli Lv Guangcai Meng Siwei Zhu Dawei Pan
author_facet	Zhongteng Bai Yanqiu Wang Mingjun Shan Yanli Lv Guangcai Meng Siwei Zhu Dawei Pan
author_sort	Zhongteng Bai
title	Study on anti-scaling of landfill leachate treated by evaporation method
title_short	Study on anti-scaling of landfill leachate treated by evaporation method
title_full	Study on anti-scaling of landfill leachate treated by evaporation method
title_fullStr	Study on anti-scaling of landfill leachate treated by evaporation method
title_full_unstemmed	Study on anti-scaling of landfill leachate treated by evaporation method
title_sort	study on anti-scaling of landfill leachate treated by evaporation method
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/6128ade9f4ee4d90a003654390efba99
work_keys_str_mv	AT zhongtengbai studyonantiscalingoflandfillleachatetreatedbyevaporationmethod AT yanqiuwang studyonantiscalingoflandfillleachatetreatedbyevaporationmethod AT mingjunshan studyonantiscalingoflandfillleachatetreatedbyevaporationmethod AT yanlilv studyonantiscalingoflandfillleachatetreatedbyevaporationmethod AT guangcaimeng studyonantiscalingoflandfillleachatetreatedbyevaporationmethod AT siweizhu studyonantiscalingoflandfillleachatetreatedbyevaporationmethod AT daweipan studyonantiscalingoflandfillleachatetreatedbyevaporationmethod
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Study on anti-scaling of landfill leachate treated by evaporation method

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