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Study on Pretreatment of Electroless Nickel Plating Waste Bath by H2O2 Oxidation/CaO Precipitation and the Effect of FO Concentration and Reduction(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2023年04期
Page:
131-137
Research Field:
环境科学与工程
Publishing date:

Info

Title:
Study on Pretreatment of Electroless Nickel Plating Waste Bath by H2O2 Oxidation/CaO Precipitation and the Effect of FO Concentration and Reduction
Author(s):
Jiang Yongwei1; 2; 3; Pan Ting4; Ding Bolei5; Cao Lei1; 2; 3; He Jiaying4; Huang Jian1; 2; 3; Feng Xusong6; Zhang Yong4
(1.Jiangsu Provincial Environmental Engineering Technology Co.,Ltd.,Nanjing 210036,China)
(2.Engineering Research Center of Standardized Construction and Intelligent Management of Industrial Parks,Nanjing 210036,China)
(3.Jiangsu Province Engineer
Keywords:
forward osmosis;  electroless nickel plating waste bath;  oxidative;  precipitation;  pretreatment
PACS:
X703
DOI:
10.3969/j.issn.1001-4616.2023.04.017
Abstract:
In order to reduce the treatment cost of high concentration electroless nickel plating waste bath,the combined process of oxidation-precipitation pretreatment-forward osmosis(FO)was used to concentrate and reduce the waste bath at room temperature. The aquaporin membrane(AQP)was used as the FO membrane,the draw solution was the 4M NaCl solution,and the FO process adopted the mode that the active layer was facing to feed solution(AL-FS). When H2O2 and CaO were used for pretreatment,the removal rates of electrical conductivity,TP,TOC and Ni of the waste bath are much higher than those of other pretreatment schemes. When 5% of CaO was added,the system water flux could reach 5.89 L·(m2·h)-1; the rejection ratio of pollutants TP,Ni and TOC after concentration were 73.97%,92.90% and 84.65%,respectively. EEM results showed that organic-like humic acid fractions were more likely to pass through the semipermeable membrane from the feed solution to the draw solution than tyrosine or tryptophan protein-like substances. Taking the appropriate amount of CaO for pretreatment can not only effectively reduce the concentration and osmotic pressure of pollutants,which is conducive to the concentration of the subsequent FO process,but also save the economic cost.

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Last Update: 2023-12-15