本文關(guān)鍵詞：堿解—吹脫聯(lián)合工藝處理吡蟲啉生產(chǎn)廢水的研究　出處：《南京農(nóng)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： 吡蟲啉 咪唑烷 N N-二甲基甲酰胺 堿解反應(yīng) 吹脫

【摘要】：我國是農(nóng)藥生產(chǎn)和使用大國,農(nóng)藥行業(yè)在我國國民經(jīng)濟(jì)中占有重要地位。高效殺蟲劑吡蟲啉被稱為"新煙堿"類化合物,以其高效、低毒、低殘留等特點(diǎn),成為新一代農(nóng)藥的代表。其中最主要的成分是咪唑烷和N,N-二甲基甲酰胺(DMF),導(dǎo)致吡蟲啉生產(chǎn)廢水含有高濃度的有機(jī)氮。因此,如何有效的去除廢水中的咪唑烷和DMF成為處理吡蟲啉生產(chǎn)廢水的關(guān)鍵。本課題研究了模擬廢水中咪唑烷和DMF的最佳堿解條件及反應(yīng)產(chǎn)物;同時(shí)對堿解后的模擬廢水進(jìn)行吹脫實(shí)驗(yàn),確定其最佳吹脫條件。通過DMF和咪唑烷的堿解實(shí)驗(yàn),考察了堿解溫度、廢水pH、堿解時(shí)間等因素對咪唑烷和DMF堿解效果的影響。結(jié)果表明DMF最佳堿解條件為pH等于13、溫度為50℃、堿解時(shí)間為2.5小時(shí)。DMF的堿解率最高能夠達(dá)到96.6%,由初始的3800mg/L降低到128.1mg/L。咪唑烷的最佳堿解條件為廢水pH等于12、溫度為60℃、反應(yīng)時(shí)間為2.5小時(shí)。在該條件下,廢水中咪唑烷的堿解率達(dá)到97.6%,咪唑烷含量由3000mg/L降低到195.5mg/L。通過LC-MS分析發(fā)現(xiàn)咪唑烷的堿解產(chǎn)物主要為咪唑烷酮,DMF的堿解產(chǎn)物為二甲胺和甲酸鹽。在確定咪唑烷和DMF的最佳堿解條件的基礎(chǔ)上綜合考慮,選擇出吡蟲啉生產(chǎn)廢水的最佳堿解反應(yīng)條件:反應(yīng)溫度為60℃、pH為13、反應(yīng)時(shí)間為2.5小時(shí)。在此條件下將吡蟲啉生產(chǎn)廢水進(jìn)行堿解實(shí)驗(yàn),生產(chǎn)廢水中的咪唑烷的堿解率達(dá)到96.9%,DMF的堿解率達(dá)到95.1%。將堿解后的吡蟲啉生產(chǎn)廢水進(jìn)行吹脫實(shí)驗(yàn),通過改變吹脫條件及單因素分析研究pH、溫度、氣液比等對廢水吹脫效果的影響。研究結(jié)果表明吡蟲啉生產(chǎn)廢水堿解后進(jìn)行吹脫的最佳條件為pH為12.3、吹脫溫度為40℃、氣液比為3000:1,在此條件下凱氏氮的去除率達(dá)到95.7%,由吹脫前的839mg/L降低到36mg/L。吹脫出來的氣體可以通過硫酸溶液進(jìn)行吸收,同時(shí)將吸收液進(jìn)行濃縮,回收產(chǎn)生的銨鹽、二甲胺鹽等物質(zhì)。吡蟲啉生產(chǎn)廢水的吹脫工藝設(shè)置在堿解反應(yīng)之后,可利用堿解反應(yīng)后的pH值以及殘溫達(dá)到更高的凱氏氮去除效率,降低廢水處理的成本。吡蟲啉生產(chǎn)廢水經(jīng)堿解吹脫聯(lián)合工藝處理后的凱氏氮含量為36mg/L,COD為2480mg/L,pH為9.69,經(jīng)過適當(dāng)?shù)呐渌{(diào)節(jié)后可進(jìn)行后續(xù)生化處理。
[Abstract]:China is a large country in pesticide production and use, and pesticide industry plays an important role in the national economy. Imidacloprid, a highly effective insecticide, is known as a "new nicotine" compound, which is characterized by its high efficiency, low toxicity and low residue. As a representative of a new generation of pesticides, the most important components are imidazolane and N-dimethylformamide (DMFN), which lead to high concentration of organic nitrogen in imidacloprid wastewater. How to effectively remove imidazolane and DMF from wastewater is the key to the treatment of imidacloprid wastewater. In this paper, the optimal alkali hydrolysis conditions and reaction products of imidazolane and DMF in simulated wastewater were studied. At the same time, the simulated wastewater after alkali hydrolysis was blown off, and the optimal blowing conditions were determined. The alkali hydrolysis temperature and pH of wastewater were investigated by DMF and imidazolane alkali hydrolysis experiments. The effect of alkali hydrolysis time on the alkali hydrolysis of imidazolane and DMF was studied. The results showed that the optimum conditions for alkali hydrolysis of DMF were pH = 13 and temperature 50 鈩，

本文編號：1438302