本文關(guān)鍵詞：超聲—電絮凝法處理農(nóng)藥廢水試驗(yàn)研究　出處：《西南交通大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 電絮凝 超聲波 聯(lián)合處理 農(nóng)藥廢水

【摘要】：隨著人口的增加和耕地面積的減少,糧食問(wèn)題已成為制約我國(guó)經(jīng)濟(jì)發(fā)展的一個(gè)重要因素。農(nóng)藥的使用使單位面積糧食產(chǎn)量得到了大幅度的提高。但是同時(shí)也帶來(lái)了許多環(huán)境問(wèn)題。其中對(duì)水環(huán)境的影響尤為嚴(yán)重,因此如何簡(jiǎn)單、高效的處理農(nóng)藥廢水已成為當(dāng)今社會(huì)關(guān)注的熱點(diǎn)。通過(guò)對(duì)國(guó)內(nèi)外處理農(nóng)藥廢水現(xiàn)狀進(jìn)行歸納總結(jié),分析了各種工藝的優(yōu)缺點(diǎn),本文選用電絮凝-超聲法對(duì)農(nóng)藥廢水進(jìn)行處理,并探究其影響因素,確定最佳操作條件。在單獨(dú)電絮凝試驗(yàn)中,通過(guò)對(duì)電解時(shí)間、電解電流、電極間距三個(gè)因素進(jìn)行正交實(shí)驗(yàn),三種因素對(duì)電絮凝處理農(nóng)藥廢水的影響力大小為電解時(shí)間電解電流電極間距。電絮凝處理農(nóng)藥廢水的最佳操作參數(shù)為:電解時(shí)間60min,電極間距3cm,電流密度20mA/cm2,在此條件下,廢水的CODCr、TOC、色度去除率分別可以達(dá)到37.01%、22.89%、51.16%,CODCr的降解動(dòng)力學(xué)過(guò)程符合二級(jí)反應(yīng)動(dòng)力學(xué)。在單獨(dú)超聲波法試驗(yàn)中,通過(guò)對(duì)超聲時(shí)間、超聲功率、廢水初始pH值三個(gè)因素進(jìn)行正交實(shí)驗(yàn),三種因素對(duì)超聲波處理農(nóng)藥廢水的影響力大小為超聲功率超聲時(shí)間pH值。在超聲輻照時(shí)間60min,超聲功率200W,pH為4的條件下,農(nóng)藥廢水的CODCr、TOC、色度去除率分別可以達(dá)到16.42%、11.33%、19.22%,CODCr的降解動(dòng)力學(xué)過(guò)程符合一級(jí)反應(yīng)動(dòng)力學(xué)。此外,降低廢水的pH,會(huì)使廢水的處理效果提高。在電絮凝、超聲波組合工藝試驗(yàn)中,選用分段和聯(lián)合處理兩種組合方式對(duì)農(nóng)藥廢水進(jìn)行了處理,處理效果較好的是聯(lián)合處理方式,聯(lián)合處理70min,CODCr、TOC、色度去除率可達(dá)65.20%、43.13%、70.65%。相比單獨(dú)電絮凝、單獨(dú)超聲波法處效果有了很大的提高。超聲-電絮凝降解動(dòng)力學(xué)過(guò)程符合一級(jí)反應(yīng)動(dòng)力學(xué)。
[Abstract]:With the increase of population and the reduction of cultivated land, the grain problem has become an important factor that restricts the economic development of our country. The use of pesticides has greatly improved the grain output per unit area. But at the same time, there are many environmental problems. The influence of the water environment is particularly serious, so how to treat the pesticide wastewater simply and efficiently has become a hot spot of attention in the society. By summarizing the current situation of pesticide wastewater treatment at home and abroad, the advantages and disadvantages of various processes were analyzed. In this paper, the electrocoagulation and ultrasonic method was applied to treat pesticide wastewater, and its influencing factors were explored, and the best operation conditions were determined. In the separate electrocoagulation test, three factors of electrolysis time, electrolysis current and electrode spacing were orthogonal experiments. The influence of three factors on the electrocoagulation wastewater was electrolysis time and the distance between electrolysis current electrodes. An optimum operation parameters of flocculation treatment of pesticide wastewater, electrolysis time 60min, electrode spacing 3cm, current density 20mA/cm2, under this condition, the removal rate of wastewater CODCr, TOC and chroma can respectively reach 37.01%, 22.89%, 51.16%, the degradation kinetics process of CODCr with two stage reaction kinetics. In the single ultrasonic test, orthogonal experiments were carried out on three factors including ultrasonic time, ultrasonic power and initial pH value of wastewater. The influence of three factors on ultrasonic treatment of pesticide wastewater was pH value of ultrasonic power and ultrasonic time. Under the condition of ultrasonic irradiation time 60min, ultrasonic power 200W and pH 4, the removal rate of CODCr, TOC and chroma of pesticide wastewater can reach 16.42%, 11.33% and 19.22%, respectively. The degradation kinetics of CODCr accords with first-order reaction kinetics. In addition, reducing the pH of the waste water will increase the treatment effect of the wastewater. In the combination process of electrocoagulation and ultrasonic, two combination ways of subsection and joint treatment were selected to treat pesticide wastewater. The combined treatment was the best way to treat pesticide wastewater. Combined treatment of 70min, CODCr, TOC and chroma removal rate could reach 65.20%, 43.13% and 70.65%. Compared with the separate electric flocculation and the single ultrasonic method, the effect has been greatly improved. The kinetic process of ultrasonic electrocoagulation degradation accords with the first order reaction kinetics.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X703

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