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为提高太湖水中蓝藻的混凝沉淀去除效果,分别采用加压预处理和化学预氧化处理工艺,再进行混凝沉淀处理。通过动态试验对比研究了加压预处理和预氧化强化混凝沉淀去除藻类的效果和水质安全性,并进行了经济分析。结果表明,短时间加压0.7 MPa后进行混凝沉淀,出水浊度为0.6~1.37 NTU,叶绿素a和COD_(Mn)去除率分别达到(97.64~99.34)%和(62.54~68.39)%;2 mg/L氯预氧化工艺沉淀出水浊度为21.4 NTU,叶绿素a和COD_(Mn)去除率分别为82.2%和39.87%;2 mg/L高锰酸钾预氧化工艺沉淀出水浊度为3.22 NTU,叶绿素a和COD_(Mn)去除率分别为94.71%和63.44%。同时,相对于预氧化工艺,加压预处理工艺可减少后续工艺藻毒素的释放和消毒副产物的生成。采用加压预处理工艺会使能耗增加0.002 3 k W·h/m~3,但可节省混凝剂投量40%,且节省了预氧化剂费用,在处理效果、水质安全性、处理成本等方面明显优于化学预氧化工艺。
In order to improve the coagulation sedimentation removal effect of cyanobacteria in Taihu Lake water, pressurized pretreatment and chemical preoxidation treatment were carried out respectively, followed by coagulation and sedimentation. The dynamic experiments were carried out to compare the effect of pretreatment and pre-oxidation coagulation to remove algae and the safety of water quality. The economic analysis was also conducted. The results show that the turbidity of the effluent is 0.6 ~ 1.37 NTU after the short time pressurization of 0.7 MPa, the removal rates of chlorophyll a and COD Mn are (97.64-99.34)% and (62.54-68.39)%, respectively; 2 The turbidity of the precipitated effluent was 21.4 NTU in the chlorination pretreatment with mg / L chlorine, and the removal rates of chlorophyll a and COD Mn were 82.2% and 39.87%, respectively. The turbidity of precipitated effluent from 2 mg / L potassium permanganate pretreatment was 3.22 NTU , Chlorophyll a and COD Mn removal rates were 94.71% and 63.44% respectively. At the same time, compared with the pre-oxidation process, the pressure pretreatment process can reduce the subsequent process of algae toxin release and disinfection by-product formation. The use of pressurized pretreatment technology will increase the energy consumption by 0.002 3 kW · h / m ~ 3, but it can save 40% of coagulant dosage, and save the cost of pre-oxidant. In terms of treatment effect, water quality safety, treatment cost Obviously better than chemical pre-oxidation process.