發(fā)布時(shí)間：2017-12-27 01:35

  本文關(guān)鍵詞：PCB廢水破絡(luò)預(yù)處理控制及對(duì)AAS-BAF工藝處理效能的影響　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 銀硫離子電極 印刷電路板廢水 破絡(luò)預(yù)處理 曝氣生物濾池

【摘要】：印刷電路板(PCB)由于制造過程復(fù)雜,工藝流程長(zhǎng),用水量大,使得產(chǎn)生的廢水污染物種類多,這其中以絡(luò)合態(tài)銅、氨氮、總氮等污染物去除較為困難。本課題選用“硫化鈉破絡(luò)預(yù)處理+缺氧活性污泥(AAS)-曝氣生物濾池(BAF)”組合工藝對(duì)PCB廢水進(jìn)行處理。硫化鈉預(yù)處理過程中藥劑投加控制成為破絡(luò)過程的關(guān)鍵。本研究中對(duì)比了監(jiān)測(cè)ORP或銀硫電極電位來(lái)調(diào)節(jié)加藥量的破絡(luò)預(yù)處理控制方法,并對(duì)方法的可行性進(jìn)行分析,最后考察連續(xù)動(dòng)態(tài)運(yùn)行組合工藝處理PCB廢水的穩(wěn)定性及其對(duì)水中污染物去除情況。研究中對(duì)比了監(jiān)測(cè)水中ORP及銀硫離子電極電位兩種控制PCB廢水破絡(luò)預(yù)處理的方法。結(jié)果表明,在利用ORP監(jiān)測(cè)控制時(shí),由于其檢測(cè)過程響應(yīng)時(shí)間長(zhǎng),易受共存離子干擾等原因,在實(shí)際應(yīng)用中存在一定局限性。利用銀硫離子電極控制時(shí),準(zhǔn)確度和精密度相對(duì)較高,響應(yīng)時(shí)間較短,并且受共存離子干擾小,能夠?qū)崿F(xiàn)對(duì)銅的破絡(luò)預(yù)處理控制。當(dāng)初始總銅的濃度在25~150 mg/L范圍內(nèi)變化時(shí),控制電位值為-750 mV,銅可完全去除,此時(shí)水中硫離子波動(dòng)范圍為2.6~39.6 mg/L。研究了預(yù)處理出水中的硫離子對(duì)缺氧活性污泥處理性能及性狀的影響。結(jié)果表明,硫離子瞬時(shí)沖擊對(duì)缺氧活性污泥反硝化速率會(huì)造成抑制,污泥濃度的增加可降低抑制效果。硫離子長(zhǎng)期存在時(shí)總抑制率為32.3%,單位質(zhì)量活性污泥反硝化速率長(zhǎng)期來(lái)看沒有明顯抑制。硫離子長(zhǎng)期存在會(huì)使污泥濃度有所降低,并且在一定程度上抑制脫氫酶活性。實(shí)際應(yīng)用中可通過適當(dāng)提高初始缺氧活性污泥濃度來(lái)提高其對(duì)硫離子抗沖擊能力,從而保證長(zhǎng)期運(yùn)行有較好的處理效果。最后利用“硫化鈉破絡(luò)預(yù)處理-AAS-BAF”組合工藝來(lái)處理實(shí)際PCB廢水,并考察了通過監(jiān)測(cè)水中銀硫電極電位來(lái)控制預(yù)處理過程的可行性和長(zhǎng)期運(yùn)行下主要污染物的處理效果。結(jié)果表明,利用銀硫電極控制電極電位均值為-617 mV時(shí),能夠快速發(fā)現(xiàn)進(jìn)水銅的波動(dòng),通過電位反饋加藥量,實(shí)現(xiàn)銅的完全去除。通過調(diào)節(jié)組合工藝停留時(shí)間可實(shí)現(xiàn)當(dāng)HRT為4 h時(shí),污泥回流比50%,硝化液回流比為200%條件下,出水總氮在15 mg/L以下,氨氮出水在5 mg/L以下,COD出水在80 mg/L以下,銅在0.5 mg/L以下,SS在30 mg/L以下,pH出水范圍為7.0~8.5之間,均滿足相關(guān)排放要求。
[Abstract]:Due to the complex manufacturing process, long process flow and large water consumption, printed circuit boards (PCB) cause a lot of wastewater pollutants, including complex copper, ammonia nitrogen and total nitrogen. In this study, PCB wastewater was treated by the combination process of "sodium sulfide pre treatment + anoxic activated sludge (AAS) and biological aerated filter (BAF)". The key of the process is to control the dosage of traditional Chinese medicine in the process of sodium sulfide pretreatment. In this study, we compared the control method of monitoring the dosage of ORP or silver sulfur electrode to control the dosage, and analyzed the feasibility of the method. Finally, we investigated the stability of PCB wastewater and the removal of pollutants in water by continuous dynamic operation combined process. In this study, the methods of monitoring the two kinds of PCB wastewater pretreatment by monitoring the ORP and the silver sulfur ion electrode potential in water were compared. The results show that when using ORP monitoring and control, due to the long response time of the detection process, vulnerable to co existing ion interference and other reasons, there are certain limitations in practical applications. When silver sulfur electrode is used to control, the accuracy and precision are relatively high, the response time is short, and the interference of coexisting ions is small, so that the pretreatment of copper can be realized. When the initial total copper concentration is in the range of 25~150 mg/L, the control potential is -750 mV, and the copper can be completely removed. At this time, the sulfur ion fluctuation range is 2.6~39.6 mg/L. The effects of sulfur ions in the pretreatment effluent on the performance and properties of anoxic activated sludge treatment were studied. The results show that the instantaneous impact of sulfur ions can inhibit the denitrification rate of the activated sludge, and the increase of sludge concentration can reduce the inhibition effect. The total inhibition rate of sulfur ions in the long term was 32.3%, and the denitrification rate of unit mass activated sludge had no obvious inhibition in the long term. The long-term existence of sulfur ions can reduce the concentration of sludge and inhibit dehydrogenase activity to a certain extent. In practical application, we can increase the initial anoxic activated sludge concentration to enhance its impact resistance to sulfur ion, so as to ensure long-term operation with good treatment effect. Finally, the combined process of sodium sulfide pretreatment and -AAS-BAF pretreatment was applied to treat the actual PCB wastewater. The feasibility of controlling the pretreatment process and the treatment effect of main pollutants in long-term operation were investigated by monitoring the potential of silver and sulfur electrode in water. The results show that when the average value of electrode potential is -617 mV, the fluctuation of influent copper can be found quickly, and the total removal of copper can be realized through potential feedback and dosage. By adjusting the combination process of residence time can be achieved when the HRT is 4 h, sludge return ratio of 50%, the nitrification liquid reflux ratio is 200%, the effluent total nitrogen below 15 mg/L, the effluent is below 5 mg/L, the effluent COD is below 80 mg/L, copper below 0.5 mg/L, SS 30 mg/L, pH the water is in the range of 7.0~8.5, all meet the relevant discharge requirements.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X76

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本文編號(hào)：1339724