天津渤海湾海水淡化预处理工艺的试验研究

Experimental study on the desalination pretreatment process of Tianjin Bohai Gulf

针对渤海湾海水低温低浊、有机物、胶体物质、悬浮物以及细菌等指标较其他海域高的特点,采用"强化混凝—O3/UV消毒"作为海水淡化蒸馏法工艺的预处理工艺,当FeCl3、聚丙烯酰胺(PAM)和聚氯化铝(PAC)的投加量分别为4mg/L、0.3mg/L和0.5mg/L,反应温度为15℃,O3投加量为2.4mg/L,UV辐射剂量为10W/L,UV/O3的接触时间为10min时,原水的浊度、CODMn、UV254及细菌去除率分别为96%、40%、19%和99.91%。经核算,该工艺的单位生产成本为0.782元/m3,单位经营成本为0.411元/m3。

According to the characteristics of the water qualities in Bohai Gulf, such as low temperature, low turbidity, relatively high content of organic, colloidal substances, suspended solids and germ compared with other ocean zones, the process of the combination of advanced coagulation and O3/UV disinfection was employed as desalination pretreatment. When the dosage of FeCl3, polyacrylamide （PAM） and polyaluminium chloride（PAC） was 4 mg/L, 0.3 mg/L and 0. 5 mg/L respectively, the temperature was 15℃, the dosage of O3 was 2.4 mg/L, UV radiation dosage was 10 W/L and the contact time of UV/O3 was 10 minutes, the removal ratio of the turbidity, CODMn, UV254 and germ in raw water was 96%, 40%, 19% and 99.91% respectively. Through calculation, the production cost of this process is 0. 782 YUAN/m^3 , the operating cost is 0. 411 YUAN/m^3.