玉米深加工废水深度处理工艺接触过滤除磷试验研究
发布时间：2019-07-03 12:09
【摘要】：吉林省是我国的玉米之乡,玉米深加工产业为吉林省的经济建设与发展起到了巨大的作用。但玉米深加工企业是用水大户,也是排污大户,做好玉米深加工企业废水的深度处理工作,实现处理后废水的资源最大化,是保护吉林省生态环境、实现节水减排和保证其米玉深加工产业健康发展的基础。本研究是国家水体污染控制与治理科技重大专项“辽河源头区水污染综合治理技术及示范研究”项目子课题中的部分内容。论文以吉林省某典型玉米深加工企业为依托,针对该企业二级废水处理工艺出水PO43--P含量过高,致使其后续的废水深度处理工艺无法正常运行的问题,采用接触过滤的方法,对二级出水(深度处理工艺的进水)进行以除磷为主要目的试验研究,以期为企业深度处理工艺恢复正常运行提供技术支持。接触过滤工艺集混凝、沉淀、过滤工艺于一体,具有占地省、资金投入少的特点。在研究过程中,首先采用PAC、FeCl3和CaO三种混凝剂,进行混凝除磷小试研究,筛选出CaO为适合的混凝剂;然后在企业现场,以二级废水处理工艺出水为研究对象,进行接触过滤中试研究,研究了滤速、CaO投加量等参数对进水中的PO43--P、浊度、COD和NH4+-N等的去除效果,优化得到了系统的最佳运行工况。主要结论如下:(1)小试结果表明,在水中PO43--P为70mg/L左右的条件下,CaO投加量为250mg/L时,可去除97%以上的PO43--P(上清液PO43--P1mg/L);而PAC、FeCl3投加量分别在1500mg/L和750mg/L时,对PO43--P的去除率才仅为90%左右。综合考虑投加药剂的经济性及除磷效果,选定CaO为后续接触过滤工艺的混凝药剂。(2)中试结果表明,当进水T在33-35℃、pH在6.0-6.5、浊度在10-35NTU,、PO43--P在30-60mg/L、COD在30-90mg/L,NH4+-N在10-50mg/L时,控制滤速为2m/h,CaO投加量为200mg/L时,中试装置可稳定运行16-18h,出水浊度在1NTU内,出水pH在9.3-9.5之间,水头损失约在2-3.5m。同时,可去除进水中97%以上PO43--P、35%-45%的COD和25%-35%的NH4+-N,且滤层在一周期内的含污量约为5 kg/m3。综上所述,接触过滤工艺可有效去除二级出水中高浓度的PO43--P,提高废水深度处理工艺的进水水质。
[Abstract]:Jilin Province is the hometown of corn in China. Corn deep processing industry has played a great role in the economic construction and development of Jilin Province. However, corn deep processing enterprises are large water users and sewage users. To do a good job in the advanced treatment of wastewater from corn deep processing enterprises and to maximize the resources of treated wastewater is the basis for protecting the ecological environment of Jilin Province, realizing water saving and emission reduction and ensuring the healthy development of its rice jade deep processing industry. This study is part of the project "Comprehensive Water pollution Control Technology and demonstration Research in the Source area of Liaohe River", which is a major scientific and technological project of water pollution control and control in China. Based on a typical corn deep processing enterprise in Jilin Province, aiming at the problem that the effluent PO43--P content of the secondary wastewater treatment process is too high, which makes the subsequent advanced wastewater treatment process unable to operate normally, the secondary effluent (the influent of the advanced treatment process) is tested and studied with the main purpose of phosphorus removal by contact filtration method. In order to provide technical support for the return of advanced processing process to normal operation. Contact filtration process integrates coagulation, sedimentation and filtration process, which has the characteristics of low occupation of land and less capital investment. In the course of the study, PAC,FeCl3 and CaO were used to study the phosphorus removal by coagulation, and CaO was selected as the suitable coagulant. Then, in the field of the enterprise, the effluent of the secondary wastewater treatment process was taken as the research object, and the pilot-scale study of contact filtration was carried out. The removal efficiency of PO43--P, turbidity, COD and NH4-N in the influent by the parameters such as filtration speed and CaO dosage were studied, and the optimum operating conditions of the system were optimized. The main conclusions are as follows: (1) when the PO43--P in water is about 70mg/L and the dosage of CaO is 250mg/L, more than 97% of PO43--P (PO43--P1mg/L) can be removed, while when the dosage of PAC,FeCl3 is 1500mg/L and 750mg/L, the removal rate of PO43--P is only about 90%. Considering the economy and phosphorus removal effect of the reagent, CaO was selected as the coagulant of the subsequent contact filtration process. (2) the results of pilot test showed that when the influent T was 33 掳35 鈩，
本文编号：2509368
[Abstract]:Jilin Province is the hometown of corn in China. Corn deep processing industry has played a great role in the economic construction and development of Jilin Province. However, corn deep processing enterprises are large water users and sewage users. To do a good job in the advanced treatment of wastewater from corn deep processing enterprises and to maximize the resources of treated wastewater is the basis for protecting the ecological environment of Jilin Province, realizing water saving and emission reduction and ensuring the healthy development of its rice jade deep processing industry. This study is part of the project "Comprehensive Water pollution Control Technology and demonstration Research in the Source area of Liaohe River", which is a major scientific and technological project of water pollution control and control in China. Based on a typical corn deep processing enterprise in Jilin Province, aiming at the problem that the effluent PO43--P content of the secondary wastewater treatment process is too high, which makes the subsequent advanced wastewater treatment process unable to operate normally, the secondary effluent (the influent of the advanced treatment process) is tested and studied with the main purpose of phosphorus removal by contact filtration method. In order to provide technical support for the return of advanced processing process to normal operation. Contact filtration process integrates coagulation, sedimentation and filtration process, which has the characteristics of low occupation of land and less capital investment. In the course of the study, PAC,FeCl3 and CaO were used to study the phosphorus removal by coagulation, and CaO was selected as the suitable coagulant. Then, in the field of the enterprise, the effluent of the secondary wastewater treatment process was taken as the research object, and the pilot-scale study of contact filtration was carried out. The removal efficiency of PO43--P, turbidity, COD and NH4-N in the influent by the parameters such as filtration speed and CaO dosage were studied, and the optimum operating conditions of the system were optimized. The main conclusions are as follows: (1) when the PO43--P in water is about 70mg/L and the dosage of CaO is 250mg/L, more than 97% of PO43--P (PO43--P1mg/L) can be removed, while when the dosage of PAC,FeCl3 is 1500mg/L and 750mg/L, the removal rate of PO43--P is only about 90%. Considering the economy and phosphorus removal effect of the reagent, CaO was selected as the coagulant of the subsequent contact filtration process. (2) the results of pilot test showed that when the influent T was 33 掳35 鈩，
本文编号：2509368
本文链接：https://www.wllwen.com/kejilunwen/nykj/2509368.html
