ZHOUShu-cen,LUWan-meng,LIPan.Micro-nanobubble Ozone Oxidation for the Treatment of RO Concentrated Water from Dyeing Wastewater[J].China Water & Wastewater,2022,38(9):88-93.
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Micro-nanobubble Ozone Oxidation for the Treatment of RO Concentrated Water from Dyeing Wastewater

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第9期 Page: 88-93 Column: Date of publication: 2022-05-01
Author(s):
ZHOU　Shu-cen1;  LU　Wan-meng2;  LI　Pan1; 3
（1. College of Environmental Science and Engineering， Tongji University， Shanghai 200092，China； 2. School of Civil Engineering， Lanzhou University of Technology， Lanzhou 730050， China； 3. State Key Laboratory of Pollution Control and Resource Reuse， Tongji University， Shanghai 200092， China）
Keywords:
micro-nanobubble;  ozone;  dyeing wastewater;  RO concentrated water
Abstract:
The poor biodegradability of high?salt dyeing wastewater produced after RO membrane treatment makes it inapplicable to be treated by biochemical technologies, and it is difficult for traditional physicochemical methods to realize efficient treatment of the wastewater. Ozonation technology has been widely concerned because of its advantages of fast reaction and no sludge production. However, ozonation of high-concentration dyeing wastewater is a mass transfer control reaction, and the low gas-liquid mass transfer rate of traditional titanium plate aeration limits the improvement of ozonation apparent reaction rate. Based on this, micro-nanobubble aeration technology and ozonation process were combined to treat high-salt dyeing wastewater.The effects of initial pH and salinity of wastewater, pressurized residence time, ozone concentration and H2O2 addition on the treatment performance of high-salt dyeing wastewater were investigated by semi-continuous flow experiment.The chroma, UV254, COD and TOC removal efficiencies of micro-nanobubble ozonation were obviously higher than those of traditional large bubble ozonation. Under the optimal operating conditions as follows: initial wastewater pH of 7, ozone dosage of 3.3 mg/(L·min) and H2O2 dosage of 15.6 mmol/L, the removal efficiencies of chroma, UV254, COD and TOC were 99.9%, 79.1%, 60.7% and 56.2% respectively after micro-nanobubble treatment for 120 min, and the amount of ozone required for removing 1 mg COD was 1.43-1.91 mg. Under the same operating conditions, the chroma, UV254, COD and TOC removal efficiencies of large bubble ozonation process were only 72.9%, 20.9%, 20.3% and 10.2%, respectively, and the amount of ozone required for removing 1 mg COD was 3.33-6.45 mg.
Last Update: 2022-05-01