MIN Rui,ZHANG Guo-zhen,WU Fu-ping,et al.Pre-ozone Enhanced Electro-flocculation-Ultrafiltration Process for the Treatment of Micro-polluted Cellar Water[J].China Water & Wastewater,2021,37(21):41-47.
预臭氧强化电絮凝—超滤工艺处理微污染窖水
- Title:
- Pre-ozone Enhanced Electro-flocculation-Ultrafiltration Process for the Treatment of Micro-polluted Cellar Water
- Keywords:
- ultrafiltration; pre-ozone enhanced electro-flocculation; micro-polluted cellar water; membrane flux
- 摘要:
- 针对我国西北村镇地区窖水微污染现状，为保障村民饮用水安全，采用预臭氧强化电絮凝联用超滤工艺处理微污染窖水，分析了单独超滤、预臭氧强化电絮凝及联用工艺对微污染窖水的处理效果。结果表明，在臭氧投量为3 mg/L、极板间距为10 mm、电流密度为26.76 A/m2、电解时间为15 min条件下，联用工艺对污染物的去除率最高，其对CODMn、UV254、NH3-N的去除率由单独超滤的20.96%、14.20%、13.38%与预臭氧强化电絮凝的58.38%、79.59%、53.91%分别提高至64.92%、83.67%、56.30%，出水水质达到《生活饮用水卫生标准》（GB 5749—2006）对于浊度、CODMn、UV254、NH3-N四项指标的要求。预臭氧强化电絮凝对原水中大分子有机物和浊度有较高的去除率，可有效减缓后续超滤膜通量衰减、提高膜的使用寿命，联用工艺更适用于农村微污染窖水的净化。
- Abstract:
- In view of the current situated micro-pollution of cellar water in rural areas in Northwestern China, the pre-ozone enhanced electro-flocculation combined with ultrafiltration was applied to treat the micro-polluted cellar water in order to ensure the safety of the drinking water for the villagers, and the actual treatment effects of the ultrafiltration along, pre-ozone enhanced electro-flocculation along and their combined process on the micro-polluted cellar water were analyzed. Under the conditions as follows: ozone dosage of 3 mg/L, electrode spacing of 10 mm, current density of 26.76 A/m2 and electrolytic time of 15 min, the combined process had the highest removal efficiency of the pollutants. The removal efficiencies of CODMn, UV254 and NH3-N were increased from 20.96%,14.20% and 13.38% of the ultrafiltration and 58.38%, 79.59% and 53.91% of the pre-ozone enhanced electro-flocculation to 64.92%, 83.67% and 56.30%, respectively, and the effluent turbidity, CODMn, UV254 and NH3-N met the requirements of Standards for Drinking Water Quality (GB 5749-2006). The pre-ozone enhanced electro-flocculation had a high removal efficiency of the macro-molecular organics and turbidity in the raw water, which could effectively slow down the subsequent ultrafiltration membrane flux attenuation and prolong the service life of the membrane. The combined process is more suitable for the purification of the micro-polluted cellar water in the rural area.
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