【摘要】：乙二醇生產(chǎn)廢水具有有機(jī)物濃度高,成分復(fù)雜,有一定毒性,難生物降解等特點(diǎn),因此,開發(fā)針對(duì)該類廢水的有效處理技術(shù)非常必要。本研究先采用鐵碳微電解—紫外組合工藝對(duì)乙二醇廢水進(jìn)行預(yù)處理,再采用升流式厭氧污泥床(UASB)工藝做進(jìn)一步處理,以達(dá)到出水要求。研究考察了不同因素對(duì)預(yù)處理及UASB反應(yīng)器運(yùn)行效果的影響,為該工藝處理乙二醇廢水提供參考依據(jù)。首先,對(duì)乙二醇廢水的預(yù)處理進(jìn)行了研究,探討了微電解氧化時(shí)間、初始濃度、紫外照射時(shí)間、照射半徑的變化對(duì)COD去除率的影響,通過(guò)正交試驗(yàn)確定了工藝的最佳運(yùn)行參數(shù)。結(jié)果表明,在鐵碳微電解工段HRT=3.0 h,紫外氧化工段的紫外照射時(shí)間為3.0 h、照射半徑為4.6 cm、原液稀釋10倍的條件下,組合工藝的出水COD去除率可以達(dá)到70%。此外,通過(guò)正交試驗(yàn)得到各個(gè)因素對(duì)處理效果的影響主次順序?yàn)?初始濃度紫外照射時(shí)間照射半徑,其中對(duì)試驗(yàn)結(jié)果影響極為顯著的因素是廢水的初始濃度。在預(yù)處理的基礎(chǔ)上完成了UASB反應(yīng)器的啟動(dòng),研究了UASB反應(yīng)器對(duì)廢水的處理效果。在UASB的啟動(dòng)過(guò)程中通過(guò)控制進(jìn)入反應(yīng)器有毒物質(zhì)的濃度,向反應(yīng)器中投加氫氧化鈉、微量金屬等方法來(lái)提高反應(yīng)器堿度和微生物生長(zhǎng)所需的微量元素,以促進(jìn)反應(yīng)器中微生物快速生長(zhǎng),縮小了UASB反應(yīng)器的啟動(dòng)時(shí)間,進(jìn)而能夠完成UASB反應(yīng)器的快速啟動(dòng)�？疾霼ASB反應(yīng)器啟動(dòng)后乙二醇濃度和pH值對(duì)運(yùn)行效果的影響,結(jié)果表明,進(jìn)水pH控制在7.5~8.5的范圍內(nèi),溫度在27℃~32℃之間,水力停留時(shí)間為10h,進(jìn)水中乙二醇濃度為3000mg/L時(shí),COD去除率可以達(dá)到92%,反應(yīng)器達(dá)到最佳運(yùn)行狀態(tài)。通過(guò)鐵碳微電解—紫外—UASB組合工藝處理后的乙二醇廢水,有機(jī)物濃度大大降低,可滿足后續(xù)的好氧生物處理要求。
[Abstract]:The wastewater from ethylene glycol production has the characteristics of high concentration of organic matter, complex composition, certain toxicity and difficult biodegradation. Therefore, it is necessary to develop an effective treatment technology for this kind of wastewater. In this study, the process of iron-carbon micro-electrolysis combined with UV was used to pre-treat ethylene glycol wastewater, and then the up-flow anaerobic sludge bed (UASB) process was used for further treatment, in order to meet the requirement of effluent. The effects of different factors on pretreatment and operation of UASB reactor were investigated in order to provide a reference for the treatment of ethylene glycol wastewater by this process. Firstly, the pretreatment of ethylene glycol wastewater was studied, and the effects of micro-electrolysis oxidation time, initial concentration, ultraviolet irradiation time and irradiation radius on the removal rate of COD were discussed. The optimum operation parameters were determined by orthogonal test. The results showed that under the conditions of HRT=3.0 h, UV oxidation stage external irradiation time 3.0 h, irradiation radius 4.6 cm, dilution 10 times, the effluent COD removal rate of the combined process could reach 70%. In addition, the effects of various factors on the treatment effect were obtained by orthogonal experiment in the order of initial concentration of ultraviolet irradiation time radiation radius, among which the most significant influence on the experimental results was the initial concentration of wastewater. On the basis of pretreatment, the start-up of UASB reactor was completed, and the effect of UASB reactor on wastewater treatment was studied. During the start-up of UASB, the alkalinity of the reactor and the trace elements needed for microbial growth can be improved by controlling the concentration of toxic substances entering the reactor and adding sodium hydroxide and trace metals into the reactor. In order to promote the rapid growth of microorganisms in the reactor, reduce the start-up time of UASB reactor, and then complete the rapid start of UASB reactor. The effects of ethylene glycol concentration and pH value on the operation effect of UASB reactor after start-up were investigated. The results showed that the influent pH was controlled in the range of 7.5 ~ 8.5, the temperature was 27 鈩，

本文編號(hào)：2296864