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.
微纳米气泡臭氧氧化处理印染废水产生的RO浓水
- Title:
- Micro-nanobubble Ozone Oxidation for the Treatment of RO Concentrated Water from Dyeing Wastewater
- Keywords:
- micro-nanobubble; ozone; dyeing wastewater; RO concentrated water
- 摘要:
- 印染废水经反渗透（RO）膜处理后产生的高盐RO浓水可生化性差导致生化方法不适用，并且难以通过传统物化方法得到高效处理，臭氧氧化技术因其反应快、不产污泥等优点受到广泛关注，但印染废水RO浓水的臭氧氧化是传质控制反应，传统钛板曝气的低气液传质速率限制了臭氧氧化表观反应速率的提升。基于此，将微纳米气泡曝气技术与臭氧氧化工艺相结合来处理印染废水RO浓水。采用半连续流试验考察了废水初始pH、盐浓度、加压停留时间、臭氧浓度和投加H2O2对印染废水RO浓水处理效果的影响。结果表明，微纳米气泡臭氧氧化法对印染废水RO浓水的色度、UV254、COD和TOC去除率比传统大气泡法均有明显提升。在废水初始pH为7、臭氧投加量为3.3 mg/（L·min）、H2O2投加量为15.6 mmol/L的最佳工艺条件下，采用微纳米气泡处理120 min以后，对色度、UV254、COD和TOC的去除率分别为99.9%、79.1%、60.7%和56.2%，去除1 mg COD所需的臭氧量为1.43~1.91 mg。相同条件下，大气泡臭氧工艺对色度、UV254、COD和TOC的去除率仅分别为72.9%、20.9%、20.3%和10.2%，去除1 mg COD所需的臭氧量为3.33~6.45 mg。
- 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.
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