高密度澄清工艺在海水净化中的应用研究

发布时间：2018-03-05 15:48

本文选题：海水　切入点：高密度澄清池　出处：《天津城建大学》2013年硕士论文　论文类型：学位论文

【摘要】：针对目前传统海水净化工艺抗冲击负荷能力差、基建与运行费用高、清洗频繁及微生物污染严重等问题,本试验以曹妃甸近岸港口海水为研究对象,将高密度澄清工艺应用于海水净化,主要开展了以下3个方面的研究和探索： (1)通过对试验原水的水质进行相关检测和考察后发现：原水中颗粒物含量总体较少,浊度较低,粒径偏小,且水质波动相对较大,这些都为净化工艺增加了难度。 (2)在对工艺运行的最佳条件进行探索后发现： ①混凝剂种类、投加量、搅拌速度、污泥回流量、次氯酸钠投加量以及排泥周期等条件对出水水质均有一定程度的影响； ②最佳运行条件为：混凝剂选用FeCl3,剂量为15mg/L,搅拌速度400r/min(G值为586.6s-1),污泥回流比15%,次氯酸钠投加量为1mg/L,排泥周期为8h。 (3)在对工艺的处理效能方面进行了连续监测和分析后得出结论：高密度澄清工艺对不同污染指标的去除效果有所不同,次氯酸钠对工艺处理效能的提升有一定的促进作用,具体表现为： ①在浊度的去除方面,高密度澄清工艺表现出了很强的稳定性,出水浊度基本保持在4-5NTU左右； ②在藻类的去除方面,高密度澄清工艺在未投加次氯酸钠的情况下处理效果并不理想,在原水叶绿素a平均含量13.83μg/L的情况下,投加次氯酸钠以后,可将出水的叶绿素a含量由11.36μg/L降低至6.94μg/L； ③在有机物的去除方面,投加次氯酸钠以后,CODMn、UV254的去除率有了较大幅度的提升,CODMn的去除率由原来的30%左右提升至50%左右,UV254的去除率由原来的26%左右提升至45%左右； ④在除铁方面,由于投加的铁盐混凝剂,出水的铁含量有所上升,但投加次氯酸钠后,情况有所缓解； ⑤在活性硅酸盐的去除方面,投加次氯酸钠能够提升高密度澄清工艺的去除效果,可将出水的平均活性硅酸盐含量由1.73mg/L降低至1.59mg/L。
[Abstract]:At present, the traditional water purification process of anti shock loading capability is poor, infrastructure and high operation cost, frequent cleaning problems and microbial pollution, the coastal port of Caofeidian sea water as the research object, the high density clarification process used in water purification, mainly carried out the research and exploration of the following 3 aspects:
(1) by detecting and investigating the quality of raw water, it is found that the content of particulate matter in raw water is less, turbidity is lower, particle size is smaller, and the fluctuation of water quality is relatively large, which all adds difficulty to the purification process.
(2) after exploring the best conditions for the operation of the process, it is found that:
1. Coagulant type, dosage, stirring speed, sludge reflux, sodium hypochlorite dosage and sludge discharge period have some influence on effluent quality.
(2) the best operation conditions are as follows: coagulant dosage is FeCl3, dosage is 15mg/L, stirring speed is 400r/min (G value is 586.6s-1), sludge reflux ratio is 15%, sodium hypochlorite dosage is 1mg/L, sludge discharge period is 8h..
(3) after continuous monitoring and analysis of process efficiency, it is concluded that high density clarification process has different effects on different pollution indicators, and sodium hypochlorite can improve the processing efficiency.
(1) in the removal of turbidity, the high density clarification process has shown strong stability, and the turbidity of the effluent is basically around 4-5NTU.
The removal of algae, high density in the clarification process without adding sodium hypochlorite under the condition of the treatment effect is not ideal, the average content of chlorophyll a in raw water of 13.83 g/L cases after adding sodium hypochlorite, the water content of chlorophyll a decreased from 11.36 g/L to 6.94 g/L;
(3) after removal of sodium hypochlorite, the removal rate of CODMn and UV254 increased greatly. The removal rate of CODMn increased from about 30% to 50%, and the removal rate of UV254 increased from about 26% to 45%.
In the field of iron removal, the iron content of the effluent was increased because of the added iron salt coagulant, but the situation was relieved after the addition of sodium hypochlorite.
(5) in the removal of active silicate, adding sodium hypochlorite can improve the removal efficiency of high-density clarification process, and the average active silicate content of effluent can be reduced from 1.73mg/L to 1.59mg/L..

【学位授予单位】：天津城建大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P746;TU991.2

【参考文献】