微压内循环反应器处理城市污水效能及污泥特性研究

发布时间：2018-01-11 05:17

  本文关键词：微压内循环反应器处理城市污水效能及污泥特性研究　出处：《长春工程学院》2017年硕士论文　论文类型：学位论文

  更多相关文章： 微压内循环反应器 城市污水 处理效果 污泥特性

【摘要】：微压内循环多生物相城市污水处理技术作为一种新型污水处理技术,在结构及曝气方式上都不同于传统污水处理工艺,通过单侧式曝气装置形成循环流态,构建出多氧区域实现同步脱氮除磷的效果。本文是基于微压内循环反应器对实际城市污水进行的试验研究,该套试验装置处理水量为290 m3/d,达到了中试试验规模,具体试验过程包括了试验的启动、调试以及稳定运行,并对污染物的去除效果及污泥特性进行分析,根据4个月的运行结果得到如下主要结论:(1)试验采用污水厂污泥直接培驯启动,进水量为12.10m3/h,回流比为100%,MLSS浓度保持在4000mg/L左右,气水比为3.5:1,HRT采用8h,对COD、NH_4~+-N、TP、SS的平均去除效率分别达到82%、97%、88%、78%,达到了预期的处理效果,中试系统调试成功;(2)进入稳定运行阶段,试验装置的工艺参数为MLSS=4500~5000mg/L,进水量Q=10m3/h,气水比为4.25:1,HRT=9.6h,回流比R=100%,污泥龄SRT=24d,出口DO浓度在1.5mg/L以上,中心DO浓度在0~0.1mg/L。在此状态下,试验装置出水的COD、NH_4~+-N、TN、TP、SS浓度最高分别为25mg/L、4.4mg/L、14.7mg/L、0.49mg/L、30mg/L,均满足《城镇污水处理厂污染物排放标准》(GB18918—2002)的排放标准,其中COD、NH_4~+-N、TN、TP都达到了一级A标准;(3)中试系统体现出高有机物去除能力及抗冲击能力强的特点。由于进水COD浓度较低,试验装置内微生物菌群都保持在低有机负荷状态,该状态下的活性污泥能使出水COD浓度降至30mg/L以下,具有高有机物去除的能力。并且出现停水、停电、降温等外部冲击,试验装置对于SS及COD的去除率仍能达到80%以上,表明装置对进水SS及COD浓度变化具有较强的抗冲击负荷能力;但运行过程中的外界因素变化会影响脱氮除磷的效果;(4)当试验装置运行水温在12.5℃以上时,污泥的胞外聚合物、SVI值、脱氢酶活性及比耗氧速率均能显示出此阶段活性污泥具有较强的新陈代谢能力及较好的生物活性。随水温从12.5℃降低的过程,污泥的SVI上升趋势逐渐变缓;胞外聚合物呈先降后升,再降再升的趋势;脱氢酶活性下降趋势趋于平缓;污泥比耗氧速率处于下降速度加快的状态,表明降温对于微生物活性的影响较强。且在水温从10℃降至9℃的过程中,污泥活性出现上升的现象。
[Abstract]:As a new sewage treatment technology, micro-pressure internal circulation multi-phase municipal sewage treatment technology is different from the traditional wastewater treatment technology in structure and aeration mode. The effect of simultaneous denitrification and phosphorus removal in a multi-oxygen region was constructed. The experimental study on the actual municipal wastewater was carried out based on the micro-pressure internal circulation reactor. The water treatment capacity of the plant was 290m3 / d. The scale of the pilot test is reached. The concrete test process includes the start-up, debugging and stable operation of the test, and the removal effect of pollutants and the characteristics of sludge are analyzed. According to the results of four months' operation, the main conclusions are as follows: 1) the sewage sludge was trained directly to start the experiment. The influent rate was 12.10 m3 / h and the reflux ratio was 100%. The concentration of MLSS was about 4 000 mg / L, the ratio of gas to water was 3. 5: 1. HRT was used for 8 hours. The average removal efficiency of SS reached 82 / 97, respectively, and reached the expected treatment effect. The pilot system was successfully debugged. The process parameters of the test device are MLSS 4500000 mg / L, water quantity 10 m3 / h, and gas-water ratio 4.25: 1. (2) in the stable operation stage, the process parameters are MLSS 4500 mg / L, Q = 10 m3 / h, and the ratio of gas to water is 4.25: 1. The sludge age was 24 days, the concentration of do in outlet was more than 1.5 mg / L, and the concentration of do in center was 0.1 mg / L. The highest concentration of CODN NH4 ~ -NX TNN TPSS in the effluent of the test plant was 25 mg / L = 4.4 mg / L = 14.7 mg / L = 0.49 mg / L. 30 mg / L, all meet the discharge standard of pollutant discharge standard (GB18918-2002) of the Municipal sewage treatment Plant (GB18918-2002), in which CODN NH4- NN TN. TP reached the first A standard; The pilot-scale test system has the characteristics of high organic removal ability and strong impact resistance. Because of the low influent COD concentration, the microbial flora in the test plant is kept in low organic loading state. The activated sludge under this condition can reduce the COD concentration of effluent to less than 30 mg / L, and has the ability of high organic removal, and the external shocks such as water shutdown, power outage, cooling and so on. The removal rate of SS and COD can still reach more than 80%, which indicates that the device has strong anti-shock load ability to the change of influent SS and COD concentration. However, the change of external factors during operation will affect the effect of nitrogen and phosphorus removal. 4) when the water temperature is above 12.5 鈩，

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