Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode
碩士 === 國立成功大學 === 化學工程學系 === 103 === Boron is also used in several industrials, including the manufacture of borosilicate glass, detergents, semiconductor, fertilizers, and dyestuff production. However, the release of boron compounds into soil and ground water due to human activities generates many...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Others |
Language: | en_US |
Published: |
2015
|
Online Access: | http://ndltd.ncl.edu.tw/handle/55622647520547202912 |
id |
ndltd-TW-103NCKU5063065 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-TW-103NCKU50630652016-08-15T04:17:39Z http://ndltd.ncl.edu.tw/handle/55622647520547202912 Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode 以鋁和鎳犧牲性陽極電混凝程序處理含硼廢水 DanisKartikaningsih 江柔雯 碩士 國立成功大學 化學工程學系 103 Boron is also used in several industrials, including the manufacture of borosilicate glass, detergents, semiconductor, fertilizers, and dyestuff production. However, the release of boron compounds into soil and ground water due to human activities generates many complex compounds with heavy metals. World Health Organization (WHO) defined an upper limit of 2.4 mg B/L for drinking water. Therefore, it is urgent to investigate the effective control of boron level in wastewaters before it is discharged into the environment. The purpose of this study was to investigate and compare the performance between aluminum and nickel as electrode in electrocoagulation process for boron removal. The effect of different parameters, such as pH, electrode pairs, current density, initial boron concentration, supporting electrolyte type, and electrical energy consumption on the efficacy of electrocoagulation of boric acid were examined. Results showed that the removal efficiency of boron increased from pH 4.0 to 8.0 and decreased at higher pH. The electrode with four pairs yielded the highest removal efficiency due to higher total surface area. Current density was the most important parameter affecting efficiency of boron removal, which increased with increasing current density from 1.25 to 5.0 mA/cm2, while the energy consumption also increased. Increasing solution concentration from 10 mg/L to 100 mg/L decreased the removal efficiency. NaCl as a supporting electrolyte performed better than Na2SO4 and NaHCO3 based on the efficacy of electrocoagulation. The mechanism of boron removal using electrocoagulation followed a second order kinetics. XRD analysis showed that the crystalline phase of precipitates was Al(OH)3 of bayerite and doyleite-types. Meanwhile, Ni electrodes indicated a higher removal efficiency compared to Al ones. At the optimum condition (e.g. pH 8 and current density of 1.25 mA/cm2), boron removal efficiencies using Ni and Al electrodes were 94% and 72%, respectively. However, results showed that the concentration of dissolved nickel was higher than aluminum. On the basis of aluminum dose, electrocoagulation was proved as more reliable process compared to chemical coagulation for boron removal. Yao-Hui Huang 黃耀輝 2015 學位論文 ; thesis 94 en_US |
collection |
NDLTD |
language |
en_US |
format |
Others
|
sources |
NDLTD |
description |
碩士 === 國立成功大學 === 化學工程學系 === 103 === Boron is also used in several industrials, including the manufacture of borosilicate glass, detergents, semiconductor, fertilizers, and dyestuff production. However, the release of boron compounds into soil and ground water due to human activities generates many complex compounds with heavy metals. World Health Organization (WHO) defined an upper limit of 2.4 mg B/L for drinking water. Therefore, it is urgent to investigate the effective control of boron level in wastewaters before it is discharged into the environment.
The purpose of this study was to investigate and compare the performance between aluminum and nickel as electrode in electrocoagulation process for boron removal. The effect of different parameters, such as pH, electrode pairs, current density, initial boron concentration, supporting electrolyte type, and electrical energy consumption on the efficacy of electrocoagulation of boric acid were examined.
Results showed that the removal efficiency of boron increased from pH 4.0 to 8.0 and decreased at higher pH. The electrode with four pairs yielded the highest removal efficiency due to higher total surface area. Current density was the most important parameter affecting efficiency of boron removal, which increased with increasing current density from 1.25 to 5.0 mA/cm2, while the energy consumption also increased. Increasing solution concentration from 10 mg/L to 100 mg/L decreased the removal efficiency. NaCl as a supporting electrolyte performed better than Na2SO4 and NaHCO3 based on the efficacy of electrocoagulation. The mechanism of boron removal using electrocoagulation followed a second order kinetics. XRD analysis showed that the crystalline phase of precipitates was Al(OH)3 of bayerite and doyleite-types.
Meanwhile, Ni electrodes indicated a higher removal efficiency compared to Al ones. At the optimum condition (e.g. pH 8 and current density of 1.25 mA/cm2), boron removal efficiencies using Ni and Al electrodes were 94% and 72%, respectively. However, results showed that the concentration of dissolved nickel was higher than aluminum. On the basis of aluminum dose, electrocoagulation was proved as more reliable process compared to chemical coagulation for boron removal.
|
author2 |
Yao-Hui Huang |
author_facet |
Yao-Hui Huang DanisKartikaningsih 江柔雯 |
author |
DanisKartikaningsih 江柔雯 |
spellingShingle |
DanisKartikaningsih 江柔雯 Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode |
author_sort |
DanisKartikaningsih |
title |
Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode |
title_short |
Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode |
title_full |
Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode |
title_fullStr |
Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode |
title_full_unstemmed |
Boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode |
title_sort |
boron removal from synthetic wastewater by electrocoagulation using aluminium and nickel as sacrificial anode |
publishDate |
2015 |
url |
http://ndltd.ncl.edu.tw/handle/55622647520547202912 |
work_keys_str_mv |
AT daniskartikaningsih boronremovalfromsyntheticwastewaterbyelectrocoagulationusingaluminiumandnickelassacrificialanode AT jiāngróuwén boronremovalfromsyntheticwastewaterbyelectrocoagulationusingaluminiumandnickelassacrificialanode AT daniskartikaningsih yǐlǚhénièxīshēngxìngyángjídiànhùnníngchéngxùchùlǐhánpéngfèishuǐ AT jiāngróuwén yǐlǚhénièxīshēngxìngyángjídiànhùnníngchéngxùchùlǐhánpéngfèishuǐ |
_version_ |
1718375678802395136 |