CASS工艺对低温的响应及其优化

发布时间：2018-01-11 07:28

本文关键词：CASS工艺对低温的响应及其优化　出处：《吉林农业大学》2015年硕士论文　论文类型：学位论文

更多相关文章： CASS工艺 北方 污水处理 低温 水质标准

【摘要】：水资源是人类生存和发展的根本;是社会经济正常运行的的命脉;是子孙后代得以延续的基础。现阶段,由于工业化进程的不断加深,城镇人口数量的不断加剧,中小型企业的不断发展、扩大,以及人们生活水平的不断提高,都导致了城镇污水量的急剧增加,水体资源极度匮乏。CASS(Cyclic Activated Sludge System)工艺作为活性污泥法处理污水的有效工艺,目前以得到了世界范围内专家、学者的认可,并在美国、日本等多个国家广泛使用,取得了很好的污水处理效果。对我国而言,CASS工艺是最普遍的污水处理工艺。其调控灵活、操作简单、占地面积小、资金投入少、管理方便、脱氮除磷效果好等优势,十分适用于对中小城市污水的处理工作。本实验,结合北方自然条件中冬季寒冷漫长的季节性特点,模拟CASS污水处理工艺中生化反应池环境特点,对CASS工艺在北方冬季运行出水水质变化进行初步研究,并结合研究结果对长春市第三污水处理厂的CASS工艺冬季运行参数进行了优化和试运行。研究结果如下:1、在试验控制排水比大约在1/3左右,进水流量200-900L/min.,进水时间(1h,4h,连续进水),曝气4h,沉淀1h,排水1h,污泥回流比50%,曝气末段溶解氧控制在2-3.0mg/L,污泥龄15d条件下,CASS污水处理工艺的出水水质随着温度的升高而提高,但低温(5℃、15℃)环境会影响其出水水质。2、在温度分别为5℃、15℃、25℃条件下,出水的COD去除率的平均值分别为86.69%、88.09%、91.54%;出水COD分别为65.47 mg/L,61.9 mg/L和44.17 mg/L;出水的SS去除率的平均值分别为88.48%、89.30%、92.63%,出水的SS分别为22 mg/L,22.3 mg/L,16.7 mg/L;出水的氨氮去除率的平均值分别为32.35%、30.13%、76.19%,出水的氨氮分别为16.14 mg/L,15.34 mg/L,5.37 mg/L;出水的总磷去除率的平均值分别为65.21%、64.13%、84.03%,出水的总磷分别为1.9 mg/L,1.65 mg/L和0.98 mg/L。在水温分别为5℃、15℃出水COD、SS、氨氮、总磷均未达到GB18918-2002的一级B类标准。3、在水温为5-15℃时,CASS工艺冬季运行各参数应控制范围为:系统污泥龄θcn在30-12小时;系统总剩余干污泥量(Stp)在35521-14709 kg;污泥浓度(MLSS)在:5680-2350 mg/L,污泥层厚度(H)在:3.55-1.47m;每周期时间(h):8-4h;排出比:2.7:1—5.4:1;周期污泥负荷:0.05-0.1;Cs:12.8-9.17 mg/L;CTSB)(:14.52-10.4 mg/L;R0:182.7-191.6 kg/h;GS:73304-76632 m3/d;曝气时间12-16h;每小时需风量:6300-4725;每组生化池每小时需风量:3150-2362 m3/h;剩余污泥量:296-306.4 m3/d。研究结果表明:虽然低温(5℃、15℃)会影响CASS污水处理工艺的出水水质,但通过工艺参数调整,完全可以使出水水质达到《城镇污水处理厂排放标准》(GB18918-2002)的一级B类标准要求。经过优化后,即使在东北吉林省长春市最寒冷的1月份,长春市双阳污水处理厂CASS工艺出水的COD最高为57.2 mg/L,最低为36.2 mg/L;ss最高为19 mg/L,最低为15 mg/L;氨氮最高为6.98 mg/L,最低为4.83 mg/L;总磷最高为1.23 mg/L,最低为0.65 mg/L,出水水质各项指标均能达到《城镇污水处理厂排放标准》(GB18918-2002)的一级B类标准要求。
[Abstract]:Water resources is essential for human survival and development; is the lifeblood of the normal operation of the economy; the foundation of future generations to continue. At this stage, with the deepening of industrialization, the urban population increasing, the continuous development of small and medium enterprises to expand, and constantly improve people's living standards, have led to the a sharp increase in the amount of urban sewage, water resource shortage (.CASS Cyclic Activated Sludge System) technology as an effective technology of activated sludge wastewater treatment, in order to get the current worldwide experts, scholars recognized and widely used in the United States, many countries such as Japan, achieved a sewage treatment effect is very good. In China, CASS technology is the most common sewage treatment process. The regulation is flexible, simple operation, small occupied area, little investment, convenient management, nitrogen and phosphorus removal is good, very Suitable for small and medium-sized city sewage treatment work. In this experiment, combined with the natural conditions in the cold winter seasonal characteristics of long, simulation of CASS sewage treatment process in the biochemical pool environment characteristics of CASS process were studied in the water quality change of operation in winter in the north, and combined with the research results of the optimization and test run of Changchun third sewage treatment plant CASS process in winter operation parameters. The results are as follows: 1, in the test of controlled drainage ratio was about 1/3, the water flow 200-900L/min., influent time (1H, 4h, 4h, continuous aeration, sedimentation water) 1H, drainage 1H, sludge return ratio of 50%, the last paragraph of dissolved oxygen aeration control in 2-3.0mg/L 15d, the sludge age conditions, effluent CASS wastewater treatment process increases with increasing temperature, but the low temperature (5 DEG, 15 DEG C) environment will affect the water quality in.2, temperature was 5 C, 15 C, 25 C, the average effluent COD removal rate were 86.69%, 88.09%, 91.54%; the effluent COD were 65.47 mg/L, 61.9 mg/L and 44.17 mg/L; the average value of effluent SS removal rate were 88.48%, 89.30%, 92.63%, SS of the effluent were 22 mg/L, 22.3 mg/L, 16.7 mg/L; average the effluent of the ammonia removal rate were 32.35%, 30.13%, 76.19%, the effluent ammonia nitrogen were 16.14 mg/L, 15.34 mg/L, 5.37 mg/L; the average value of effluent total phosphorus removal rate were 65.21%, 64.13%, 84.03%, the effluent TP were 1.9 mg/L, 1.65 mg /L and 0.98 mg/L. in water were 5 C, 15 C SS, effluent COD, ammonia nitrogen, total phosphorus did not reach a B standard.3 GB18918-2002, when water temperature is 5-15 DEG C, CASS process parameters should be controlled in winter range: the sludge age of theta CN in 30-12 hours; the total remaining amount of dry sludge system (Stp) in 35521-14709 kg; sludge concentration Degree (MLSS) in 5680-2350 mg/L, the sludge layer thickness (H): 3.55-1.47m; in each cycle time (H): 8-4h; discharge ratio: 2.7:1 - 5.4:1; Cs:12.8-9.17: 0.05-0.1; sludge load cycle mg/L (14.52-10.4); CTSB: mg/L; R0:182.7-191.6 kg/h; GS: 73304-76632 m3/d; aeration time 12-16h per hour; air volume: 6300-4725; each biochemical pool per hour to volume: 3150-2362 m3/h; residual sludge: 296-306.4 m3/d. results show that although low temperature (5 DEG, 15 DEG C) will affect the CASS sewage treatment process effluent water quality, but by adjusting process parameters can be resorted to water quality meet the emission standard of < > town factory sewage treatment (GB18918-2002) for a B standard. After the optimization, even in the northeastern province of Jilin City, the Changchun cold in January, Changchun Shuangyang wastewater treatment plant effluent CASS COD up to 57.2 mg/L, the lowest was 36.2 mg/L; SS up to 19 mg/L The lowest is 15 mg/L, the highest ammonia nitrogen is 6.98 mg/L, the lowest is 4.83 mg/L, the total phosphorus is the highest 1.23 mg/L, the lowest is 0.65 mg/L, and each index of effluent quality can achieve the first class B standard requirement of < < sewage treatment plant discharge standard > (GB18918-2002) >.

【学位授予单位】：吉林农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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