【摘要】：吉林省是我國的玉米之鄉(xiāng),玉米深加工產(chǎn)業(yè)為吉林省的經(jīng)濟建設(shè)與發(fā)展起到了巨大的作用。但玉米深加工企業(yè)是用水大戶,也是排污大戶,做好玉米深加工企業(yè)廢水的深度處理工作,實現(xiàn)處理后廢水的資源最大化,是保護吉林省生態(tài)環(huán)境、實現(xiàn)節(jié)水減排和保證其米玉深加工產(chǎn)業(yè)健康發(fā)展的基礎(chǔ)。本研究是國家水體污染控制與治理科技重大專項“遼河源頭區(qū)水污染綜合治理技術(shù)及示范研究”項目子課題中的部分內(nèi)容。論文以吉林省某典型玉米深加工企業(yè)為依托,針對該企業(yè)二級廢水處理工藝出水PO43--P含量過高,致使其后續(xù)的廢水深度處理工藝無法正常運行的問題,采用接觸過濾的方法,對二級出水(深度處理工藝的進水)進行以除磷為主要目的試驗研究,以期為企業(yè)深度處理工藝恢復(fù)正常運行提供技術(shù)支持。接觸過濾工藝集混凝、沉淀、過濾工藝于一體,具有占地省、資金投入少的特點。在研究過程中,首先采用PAC、FeCl3和CaO三種混凝劑,進行混凝除磷小試研究,篩選出CaO為適合的混凝劑;然后在企業(yè)現(xiàn)場,以二級廢水處理工藝出水為研究對象,進行接觸過濾中試研究,研究了濾速、CaO投加量等參數(shù)對進水中的PO43--P、濁度、COD和NH4+-N等的去除效果,優(yōu)化得到了系統(tǒng)的最佳運行工況。主要結(jié)論如下:(1)小試結(jié)果表明,在水中PO43--P為70mg/L左右的條件下,CaO投加量為250mg/L時,可去除97%以上的PO43--P(上清液PO43--P1mg/L);而PAC、FeCl3投加量分別在1500mg/L和750mg/L時,對PO43--P的去除率才僅為90%左右。綜合考慮投加藥劑的經(jīng)濟性及除磷效果,選定CaO為后續(xù)接觸過濾工藝的混凝藥劑。(2)中試結(jié)果表明,當(dāng)進水T在33-35℃、pH在6.0-6.5、濁度在10-35NTU,、PO43--P在30-60mg/L、COD在30-90mg/L,NH4+-N在10-50mg/L時,控制濾速為2m/h,CaO投加量為200mg/L時,中試裝置可穩(wěn)定運行16-18h,出水濁度在1NTU內(nèi),出水pH在9.3-9.5之間,水頭損失約在2-3.5m。同時,可去除進水中97%以上PO43--P、35%-45%的COD和25%-35%的NH4+-N,且濾層在一周期內(nèi)的含污量約為5 kg/m3。綜上所述,接觸過濾工藝可有效去除二級出水中高濃度的PO43--P,提高廢水深度處理工藝的進水水質(zhì)。
[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 擄35 鈩，

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