Fluoride removal using Alum & PACl in batch & continuous modewith subsequent microfiltration

IF 0.8 4区工程技术 Q4 ENGINEERING, CHEMICAL

Membrane Water Treatment Pub Date : 2021-03-01 DOI:10.12989/MWT.2021.12.2.083

S. Dubey, M. Agarwal, A. Gupta

{"title":"Fluoride removal using Alum & PACl in batch & continuous modewith subsequent microfiltration","authors":"S. Dubey, M. Agarwal, A. Gupta","doi":"10.12989/MWT.2021.12.2.083","DOIUrl":null,"url":null,"abstract":"In this study, defluoridation efficiency by aluminium sulphate (alum) and polyaluminium chloride (PACl) were compared for recommended Nalgonda dose (100%) and 80 % of this dose in both batch and continuous modes. The residual turbidity was found to be higher in case of alum as compared to PACl with 80 % dose representing lesser efficient settling of suspensions, which primarily comprise alumino-fluoro complexes that result in high residual aluminium in the treated water and this was confirmed by TEM and Zeta analysis. Moreover, the application of PACl also resulted in much lesser addition to the TDS and also required lesser lime for pH compensation due to its lower acidity. Hence this reduced dose was recommended for defluoridation. It was also observed that in case of alum, residual aluminium in treated water was 0.88 mg/L (100% dose) & 0.72 mg/L (80% dose) and in case of PACl, it was 0.52 mg/L(100% dose) & 0.41 mg/L(80% dose). After subsequent microfiltration, residual aluminium was 0.28 & 0.21 mg/L for 100 % & 80 % dose respectively and in case of alum and in case of PACl, it was 0.16 & 0.11 for 100% & 80 % dose respectively, which conform to the Al standards(<0.2 mg/L).","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"12 1","pages":"83"},"PeriodicalIF":0.8000,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Membrane Water Treatment","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.12989/MWT.2021.12.2.083","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

In this study, defluoridation efficiency by aluminium sulphate (alum) and polyaluminium chloride (PACl) were compared for recommended Nalgonda dose (100%) and 80 % of this dose in both batch and continuous modes. The residual turbidity was found to be higher in case of alum as compared to PACl with 80 % dose representing lesser efficient settling of suspensions, which primarily comprise alumino-fluoro complexes that result in high residual aluminium in the treated water and this was confirmed by TEM and Zeta analysis. Moreover, the application of PACl also resulted in much lesser addition to the TDS and also required lesser lime for pH compensation due to its lower acidity. Hence this reduced dose was recommended for defluoridation. It was also observed that in case of alum, residual aluminium in treated water was 0.88 mg/L (100% dose) & 0.72 mg/L (80% dose) and in case of PACl, it was 0.52 mg/L(100% dose) & 0.41 mg/L(80% dose). After subsequent microfiltration, residual aluminium was 0.28 & 0.21 mg/L for 100 % & 80 % dose respectively and in case of alum and in case of PACl, it was 0.16 & 0.11 for 100% & 80 % dose respectively, which conform to the Al standards(<0.2 mg/L).

查看原文本刊更多论文

使用Alum和PACl在间歇和连续模式下去除氟化物，随后进行微滤

在本研究中，比较了Nalgonda推荐剂量（100%）和该剂量的80%在分批和连续模式下硫酸铝（明矾）和聚氯化铝（PACl）的除氟效率。发现在明矾的情况下，与80%剂量的PACl相比，残余浊度更高，这表示悬浮液的沉降效率较低，悬浮液主要包括铝-氟络合物，其导致处理水中的高残余铝，这通过TEM和Zeta分析得到了证实。此外，PACl的应用也减少了TDS的添加量，并且由于其酸度较低，还需要较少的石灰来补偿pH。因此，建议采用这种减少的剂量进行除氟。还观察到，在明矾的情况下，处理水中的残留铝为0.88 mg/L（100%剂量）和0.72 mg/L（80%剂量），在PACl的情况下为0.52 mg/L（100%浓度）和0.41 mg/L（80%浓度）。在随后的微滤后，100%和80%剂量的残余铝分别为0.28和0.21 mg/L，在明矾和PACl的情况下，100%和80%剂量的残留铝分别为0.16和0.11，符合Al标准（<0.2 mg/L）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Membrane Water Treatment ENGINEERING, CHEMICAL-WATER RESOURCES

CiteScore

1.90

自引率

30.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Membrane and Water Treatment(MWT), An International Journal, aims at opening an access to the valuable source of technical information and providing an excellent publication channel for the global community of researchers in Membrane and Water Treatment related area. Specific emphasis of the journal may include but not limited to; the engineering and scientific aspects of understanding the basic mechanisms and applying membranes for water and waste water treatment, such as transport phenomena, surface characteristics, fouling, scaling, desalination, membrane bioreactors, water reuse, and system optimization.