【摘要】：內(nèi)循環(huán)式厭氧反應(yīng)器(Internal circulation anaerobic reactor,IC)是荷蘭PAQUES公司于80年代中期在UASB反應(yīng)器的基礎(chǔ)上研發(fā)的第三代高效厭氧反應(yīng)器。IC反應(yīng)器處理生化性差的高濃度工業(yè)廢水時,反應(yīng)初期產(chǎn)氣量少,不足以形成高效的液壓混合,使得污泥停留在反應(yīng)器底部,影響了廢水與污泥之間的傳質(zhì),從而限制了該反應(yīng)器的應(yīng)用范圍。紡織業(yè)是我國重要的傳統(tǒng)工業(yè),每年排放大量的印染廢水,因此,開展印染廢水的處理研究具有重要的意義。為了克服IC反應(yīng)器在工程應(yīng)用中的局限性,本文采用改進(jìn)型的IC厭氧反應(yīng)器處理印染廢水。不同于一般的IC反應(yīng)器,改進(jìn)型IC厭氧反應(yīng)器在第一反應(yīng)室與進(jìn)口混合區(qū)設(shè)置循環(huán)管,強(qiáng)化了污泥與污染物基質(zhì)之間的混合和傳質(zhì),提高了反應(yīng)器的處理效果。主要研究結(jié)果如下:(1)本試驗(yàn)利用顆粒污泥作為接種污泥,在外循環(huán)流量為420L/h下,逐步提高印染廢水比例來馴化顆粒污泥,經(jīng)過48天完成啟動階段。隨著印染廢水比例的增加,COD去除率從93.8%降至85%,出水VFA濃度呈現(xiàn)上升趨勢。通過提高進(jìn)水流量和進(jìn)水濃度來逐步地提高容積負(fù)荷,使其從4.8 kg COD/(m3·d)提高到9.6 kg COD/(m3·d),COD去除率達(dá)到75%,其中最高為87.2%,產(chǎn)氣量從1.5 L/(L·d)增加到2.92 L/(L·d)。反應(yīng)器在穩(wěn)定運(yùn)行后,容積負(fù)荷為8.4kg COD/(m3·d)時,COD去除率達(dá)到85%,出水中VFA穩(wěn)定在200 mg/L以下。(2)改進(jìn)型IC厭氧反應(yīng)器最佳的外循環(huán)流量為420 L/h(上升流速為23.9 m/h),在該流速下COD去除率達(dá)到85%。過低的上升流速(0.1 m/h)會引起泥水的混合不均和反應(yīng)器內(nèi)存在死角區(qū),降低COD去除效率,而過大的上升流速(40.9 m/h)會加強(qiáng)污泥間碰撞,造成污泥破碎。(3)對接種污泥和穩(wěn)定運(yùn)行后的顆粒污泥進(jìn)行特性研究,發(fā)現(xiàn)隨著反應(yīng)器的運(yùn)行,顆粒粒徑分布發(fā)生變化,粒徑2mm的顆粒污泥占總質(zhì)量比例從77.9%增加到85.5%。顆粒污泥表面存在許多不同形狀的空隙和洞穴。接種前后的顆粒污泥中都存在大量的產(chǎn)甲烷菌,主要是甲烷桿菌、甲烷鬢毛菌、甲烷繩菌。(4)對改進(jìn)型IC厭氧反應(yīng)器在上升流速分別為23.9 m/h和0.1m/h兩種情況下的動力學(xué)特性進(jìn)行研究,發(fā)現(xiàn)Grau second-order和Modified Stover-Kincannon動力學(xué)模型都適用,R20.98,其線性相關(guān)性高。
[Abstract]:The internal circulation anaerobic reactor (Internal circulation anaerobic) is the third generation of high efficiency anaerobic reactor based on the UASB reactor developed by Netherlands PAQUES Company in the mid-1980s. When the reactor is used to treat high concentration industrial wastewater with poor biodegradability, the initial gas production of the reactor is less. It is not enough to form efficient hydraulic mixing, which makes the sludge stay at the bottom of the reactor, which affects the mass transfer between wastewater and sludge, thus limiting the application of the reactor. Textile industry is one of the most important traditional industries in our country, and a large amount of printing and dyeing wastewater is discharged every year. Therefore, it is of great significance to study the treatment of printing and dyeing wastewater. In order to overcome the limitation of IC reactor in engineering application, an improved IC anaerobic reactor was used to treat dyeing wastewater. Different from the conventional IC reactor, the improved IC anaerobic reactor is equipped with circulating tubes in the first reactor and the inlet mixing zone, which enhances the mixing and mass transfer between sludge and pollutant matrix, and improves the treatment efficiency of the reactor. The main results are as follows: (1) in this experiment, granular sludge was used as inoculation sludge, and the proportion of printing and dyeing wastewater was gradually increased to acclimate the granular sludge under the external circulation flow rate of 420L/h. After 48 days, the start-up stage was completed. With the increase of the proportion of printing and dyeing wastewater, the removal rate of VFA decreased from 93.8% to 85wt%, and the effluent VFA concentration showed an increasing trend. By increasing the influent flow rate and influent concentration, the volumetric load was gradually increased from 4.8 kg COD/ (m 3 d) to 9.6 kg COD/ (m 3 d). The removal rate of COD was 75%, of which the highest was 87.2%, and the gas production increased from 1.5 L / (L d) to 2.92 L / (L d). After stable operation, the COD removal rate of the reactor is 85mg / h when the volumetric loading is 8.4kg COD/ (m3 / d), and the VFA in the effluent is below 200 mg/L. (2) the optimal external circulation flow rate of the improved IC anaerobic reactor is 420L / h (the rising velocity is 23.9 m/ h), and the removal rate of COD reaches 85g / h at this flow rate. Too low up flow rate (0.1 m / h) will lead to uneven mixing of mud water and dead corner zone in reactor, which will reduce COD removal efficiency, while too high rising velocity (40.9 m / h) will enhance sludge collision. (3) the characteristics of the inoculated sludge and the granular sludge after stable operation were studied. It was found that the particle size distribution changed with the operation of the reactor, and the proportion of granular sludge with the particle size of 2mm increased from 77.9% to 85.5%. There are many different forms of voids and caverns on the granular sludge surface. There are a lot of methanogenic bacteria in granular sludge before and after inoculation, mainly methanobacterium, methanophora. (4) the kinetic characteristics of the improved IC anaerobic reactor were studied under the condition of rising velocity of 23.9 m / h and 0.1m/h, respectively. It was found that the kinetic models of Grau second-order and Modified Stover-Kincannon were both suitable for R20.98, and the linear correlation was high.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X791

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本文編號：2191945