| 强化混凝对低浊含藻水污染控制研究 |
| Pollution Control in Low Algal Turbidity Water Using Enhanced Coagulation |
| 投稿时间：2024-03-31 修订日期：2024-05-26 |
| DOI：10.15928/j.1674-3075.202403310103 |
| 中文关键词:低浊含藻水 高锰酸钾 聚合氯化铝 强化混凝 藻浓度 |
| 英文关键词:low turbidity algal water enhanced coagulation potassium permanganate polyaluminium chloride algal cell concentration |
| 基金项目:国家自然科学基金(51978618)；浙江省自然科学基金(LY21E080018)；浙江工业大学-钱江水利开发股份有限公司校企合作项目(KYY-HX-20220485)。 |
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| 中文摘要: |
| 针对水源地夏季藻类暴发现象，探究了单独投加聚合氯化铝(PAC)、辅助投加高岭土为助凝剂，以及高锰酸钾(KMnO4)预氧化强化混凝3种工艺对稳定生长期内不同藻细胞浓度的低浊含藻水中OD680、UV254、DOC和浊度的去除效果。结果表明，当藻细胞浓度为105个/mL时，辅助投加高岭土调节初始浊度为10 NTU的低浊含藻水,投加10 mg/L PAC对OD680、UV254、DOC的去除效果最佳，分别为96.8%、52.0%、55.1%，且沉淀30 min后出水浊度小于1 NTU；当藻细胞浓度为106个/mL时，采用KMnO4预氧化(1.2 mg/L，1.5 h)强化混凝可有效降低PAC投加量(4 mg/L)，对OD680、UV254、DOC的去除效果最佳，分别为97.5%、39.3%、25.4%，且沉淀30 min后出水浊度仍满足1 NTU以下。扫描电镜(SEM)结果可知，预氧化对藻细胞的损伤较小，外壳出现轻微变化，混凝后对藻细胞的包裹性更强。对于实际低浊含藻水源水，KMnO4预氧化强化混凝工艺对藻类、有机物和浊度的去除效果最优，同时在出水浊度达标情况下可以大幅减少混凝剂使用量。 |
| 英文摘要: |
| Frequent algae blooms in lakes and reservoirs during summer has seriously impaired the safety of drinking water sources in recent years. In this study, polyaluminium chloride (PAC) was selected as the coagulant, and we compared the efficacy and mechanism of three treatment processes. Treatment effectiveness was assessed by measuring the OD680, UV254, DOC and turbidity in low algal turbidity water with different algae concentrations and raw water from water treatment plants. The three treatments included: PAC (10 g/L), PAC with kaolin as a coagulant aid, and enhanced coagulation using pre-oxidation with potassium permanganate (KMnO4, 1.2 mg/L). Trials were run on simulated source water, including two algal cell concentrations (105 cells /mL, 106 cells /mL) tested during the stable growth period and three levels of turbidity (10, 15, 20 NTU). With PAC alone, at an algal cell concentration of 105 cells /mL and a turbidity level of 10 NTU, the decreases in OD680, UV254 and DOC were 78.6%, 54.7%, 40.1%. When kaolin was added to the same system, the OD680, UV254 and DOC decreased 96.8%, 52.0% and 55.1%, and the turbidity of the effluent was < 1 NTU after 30 min. At an algal cell concentration of 106 cells /mL, KMnO4 pre-oxidation (1.2 mg/L, 1.5 h) enhanced coagulation with a decrease in PAC dosage (4 mg/L), and the OD680, UV254 and DOC were reduced by 97.5%, 39.3% and 25.4%. After 30 min, the turbidity of the effluent was still < 1 NTU. Based on scanning electron microscope (SEM) imagery, pre-oxidation caused little damage to the algal cells. Only slight changes were observed on the outer membrane, and encapsulation of algal cells was stronger after coagulation. With raw water from the treatment plant, KMnO4 pre-oxidation enhanced coagulation and gave the highest reductions in algae, organic matter and turbidity. Further, it allows for a significant reduction in coagulant dosage while ensuring that the turbidity of treated water meets the standard. |
| 沈松土,叶巧玲,施鑫波,吕昌根,马 鑫,朱世俊,邓 靖.2024.强化混凝对低浊含藻水污染控制研究[J].水生态学杂志,45(6):172-179. |
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