發(fā)布時間：2018-10-26 20:31

【摘要】：乙二醇生產(chǎn)廢水具有有機物濃度高,成分復(fù)雜,有一定毒性,難生物降解等特點,因此,開發(fā)針對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—紫外組合工藝對乙二醇廢水進行預(yù)處理,再采用升流式厭氧污泥床(UASB)工藝做進一步處理,以達到出水要求。研究考察了不同因素對預(yù)處理及UASB反應(yīng)器運行效果的影響,為該工藝處理乙二醇廢水提供參考依據(jù)。首先,對乙二醇廢水的預(yù)處理進行了研究,探討了微電解氧化時間、初始濃度、紫外照射時間、照射半徑的變化對COD去除率的影響,通過正交試驗確定了工藝的最佳運行參數(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去除率可以達到70%。此外,通過正交試驗得到各個因素對處理效果的影響主次順序為:初始濃度紫外照射時間照射半徑,其中對試驗結(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,研究了UASB反應(yīng)器對廢水的處理效果。在UASB的啟動過程中通過控制進入反應(yīng)器有毒物質(zhì)的濃度,向反應(yīng)器中投加氫氧化鈉、微量金屬等方法來提高反應(yīng)器堿度和微生物生長所需的微量元素,以促進反應(yīng)器中微生物快速生長,縮小了UASB反應(yīng)器的啟動時間,進而能夠完成UASB反應(yīng)器的快速啟動�？疾霼ASB反應(yīng)器啟動后乙二醇濃度和pH值對運行效果的影響,結(jié)果表明,進水pH控制在7.5~8.5的范圍內(nèi),溫度在27℃~32℃之間,水力停留時間為10h,進水中乙二醇濃度為3000mg/L時,COD去除率可以達到92%,反應(yīng)器達到最佳運行狀態(tài)。通過鐵碳微電解—紫外—UASB組合工藝處理后的乙二醇廢水,有機物濃度大大降低,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：2296864