XUE Fang-qin,LIU Li,WANG Xin,et al.Pretreatment Technology of Dual Membrane Process for Reclaimed Water Reuse and Its Engineering Demonstration in PCB Industry[J].China Water & Wastewater,2021,37(17 17):100-106.
Pretreatment Technology of Dual Membrane Process for Reclaimed Water Reuse and Its Engineering Demonstration in PCB Industry
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
17 17
Page:
100-106
Column:
Date of publication:
2021-09-01
- Keywords:
- wastewater from printed circuit board production; reclaimed water reuse; dual membrane process; light and heavy wastewater diversion; Fenton oxidation
- Abstract:
- There are some common problems, such as short service life of the reverse osmosis (RO) membrane and insufficient capacity of the dual membrane system in the printed circuit board (PCB) industry. Based on the investigation of several demonstration companies, the raw water was divided into two categories: light wastewater and heavy wastewater. The light wastewater was directly fed into the RO system on the basis of the removal of some oxidizing substances (such as residual chlorine). Meanwhile, the heavy wastewater was treated by the Fenton oxidation process to simultaneously remove the organic pollutants and heavy metals before entering the dual membrane system, and the Fenton oxidation process could break the copper and nickel complexes. The parameters of Fenton oxidation, such as pH, reaction time, the dosage of hydrogen peroxide and the ratio of hydrogen peroxide to ferrous oxide, were explored in bench experiments and verified in a pilot project. Furthermore, a biological aerated filter (BAF) was added after the Fenton oxidation process to further remove the COD. Under these conditions, the COD and copper ion in the effluent were less than 120 mg/L and 2 mg/L, respectively, which met the requirements to enter the dual membrane process. Therefore, a technology for PCB production wastewater pretreatment based on light and heavy wastewater diversion and simultaneous removal of organics and heavy metals by Fenton oxidation was determined and demonstrated in an actual project with an expected performance.
Last Update:
2021-09-01