硫—硫铁填充床用于城市污水深度脱氮除磷的研究

发布时间：2018-01-05 22:32

本文关键词：硫—硫铁填充床用于城市污水深度脱氮除磷的研究　出处：《清华大学》2015年硕士论文　论文类型：学位论文

【摘要】：深度脱氮除磷是满足日益严格的城市污水处理厂污染物排放标准、控制敏感水体富营养化的有效技术保障。针对现有城市污水厂处理出水,利用硫-铁耦合技术能实现氮磷的低成本高效去除,由于填料板结严重影响其运行稳定性,已成为制约该技术实用化的关键性问题。在分析硫铁耦合填料堵塞机理的基础上,通过脱氧、改变填充方式、反冲洗等手段防止填料板结影响运行稳定,进而设计和搭建中试反应器,考察中试装置的脱氮除磷效果,为该技术的实际应用提供支撑。利用纯硫填充床进行脱氧,滤速为0.55~1.37 m/h,填料高度为25cm处出水溶解氧(Dissolved oxygen,DO)浓度均低于0.4mg/L,脱除率均在90%以上;纯硫填充床最高脱氮负荷达2000 mgNO3--N/(L·d)。在应用单质铁除磷时,H+和NO3-存在会影响铁释放对总磷(Total phosphorus,TP)的去除,而溶解氧对TP去除几乎没有影响。在不同滤速条件下,硫-硫铁完全混合填充床出水最低NO3--N浓度为1.9mg/L,最高脱氮负荷为910 mg NO3--N/(L·d);硫-硫铁分层填充床出水最低NO3--N浓度为0.34mg/L,最高脱氮负荷为1100mg NO3--N/(L·d),两组反应器的TP出水浓度均低于0.2mg/L。经过长期运行,硫-硫铁完全混合填充床经过50天后才逐渐开始出现堵塞,硫-硫铁分层填充床在100天的运行时间内未发生堵塞,利用硫脱氧和硫铁分层填充相结合可以有效地延缓填料堵塞。硫-硫铁中试填充床经过130天的培养完成启动,硫填充床对DO的脱除率达90%以上,进水流量为0.5~1.5m3/h时,出水NO3--N浓度低于3mg/L,出水TP浓度低于0.2mg/L,有效地实现了污水深度脱氮除磷。
[Abstract]:The depth of nitrogen and phosphorus removal is to meet the increasingly strict city sewage treatment plant pollutant emission standards, effective technical guarantee sensitive control of eutrophication. According to the existing city sewage treatment plant effluent, efficient removal using low cost sulfur iron coupling technology to achieve nitrogen and phosphorus, the campaction seriously affect the operation stability, has become a key the problem of restricting the practicability of this technique. Based on the analysis of sulfur iron coupling clogging mechanism, through deoxidation, change the fill, backwashing and other means to prevent campaction effect is stable, and the design and construction of pilot reactor test, the effect of nitrogen and phosphorus removal device inspection, to provide support for the practical application the packed bed technology. Using pure oxygen sulfur, filtration rate is 0.55~1.37 m/h, 25cm at the height of packing water dissolved oxygen (Dissolved oxygen, DO) concentrations were lower than 0.4mg/L, removal rate In more than 90%; the highest pure sulfur packed bed nitrogen load 2000 mgNO3--N/ (L - D). In the application of iron and phosphorus, H+ and NO3- will affect the iron release of TP (Total phosphorus, TP) and the removal of dissolved oxygen has little effect on TP removal. The filtration rate in different conditions. The sulfur sulfur iron completely mixed bed effluent the lowest NO3--N concentration is 1.9mg/L, the highest nitrogen removal load was 910 mg NO3--N/ (L - D); sulfur - sulfur iron layered packed bed minimum effluent concentration of NO3--N was 0.34mg/L, the highest nitrogen removal load of 1100mg NO3--N/ (L - D), two groups of water reactor TP the concentration of 0.2mg/L. was lower than that after long-term operation, sulfur - sulfur iron completely mixed packed bed after 50 days was gradually blocked, sulfur - sulfur iron layered packed bed without jam in the running time of 100 days, the use of sulfur and sulfur iron deoxidation layer combination can effectively delay the clogging the sulfur sulfur. Iron In the packed bed after 130 days of incubation starting, sulfur removal of DO bed filling rate is above 90%, the water flow is 0.5~1.5m3/h, the concentration of NO3--N is lower than 3mg/L, the concentration of TP is lower than 0.2mg/L, the effective implementation of the sewage nitrogen and phosphorus removal.

【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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