發(fā)布時(shí)間：2019-01-19 15:33

【摘要】：論文按照“源頭治理”的思路,提出采用“混凝沉降法+物理吸附”聯(lián)合處理工藝處理腈綸紡絲后紡廢水。分別考察并確定了絮凝沉降、混凝沉降、活性炭物理吸附,以及活性炭再生等工序較適宜的工藝條件,并借助Zeta電位分析、FESEM、激光粒度分析等現(xiàn)代分析測試技術(shù)對絮凝沉降、混凝沉降、活性炭物理吸附等過程機(jī)理進(jìn)行了初步探討,所得實(shí)驗(yàn)結(jié)果和主要結(jié)論如下:(1)采用絮凝沉降法處理腈綸紡絲后紡廢水,以處理后水樣的濁度為主要考察指標(biāo),篩選并確定PAC為較適宜的絮凝劑,通過單因素條件實(shí)驗(yàn)和正交實(shí)驗(yàn)考察并確定較適宜的絮凝沉降工藝條件,優(yōu)化條件下的重復(fù)實(shí)驗(yàn)結(jié)果顯示處理后水樣的平均濁度為0.51NTU,濁度去除率達(dá)到86.64%。(2)采用混凝沉降法處理腈綸紡絲后紡廢水,以PAC為絮凝劑,CPAM為助凝劑,以處理后水樣的濁度為主要考察指標(biāo),通過單因素條件實(shí)驗(yàn)和正交實(shí)驗(yàn)考察并確定較適宜的混凝沉降工藝條件,優(yōu)化條件下的重復(fù)實(shí)驗(yàn)結(jié)果顯示處理后水樣的平均濁度為0.22NTU,濁度去除率達(dá)到96.30%。(3)活性炭靜態(tài)物理吸附:.以CODcr為主要考察指標(biāo),通過對比篩選實(shí)驗(yàn),確定4#活性炭(材質(zhì)煙煤)為較適宜的物理吸附劑,考察并確定較適宜的活性炭靜態(tài)吸附工藝條件,重復(fù)實(shí)驗(yàn)結(jié)果顯示處理后水樣的平均濁度為0.13NTU1NTU,濁度去除率達(dá)到97.81%;平均CODcr為 10.3mg·L-150mg·L-1, CODcr去除率達(dá)到85.4%,達(dá)到后紡廢水回用的經(jīng)濟(jì)技術(shù)指標(biāo)要求。(4)采用低溫加熱再生方法對飽和活性炭進(jìn)行再生,確定活性炭低溫加熱再生方式為馬弗爐(空氣氛)加熱和較適宜的再生工藝條件,此條件下,再生循環(huán)次數(shù)1～3次時(shí),再生后活性炭的綜合恢復(fù)率均可達(dá)到70%以上。(5)對“混凝+物理吸附”工藝的處理成本進(jìn)行了初步估算,結(jié)果表明,活性炭循環(huán)使用四次時(shí),每處理1噸腈綸紡絲后紡廢水的成本大約為0.45元,顯示出很強(qiáng)的成本優(yōu)勢。
[Abstract]:According to the idea of "Source treatment", the combined treatment process of "coagulation and sedimentation physical adsorption" was put forward to treat acrylic fiber spinning wastewater. The proper technological conditions of flocculation settlement, coagulation sedimentation, activated carbon physical adsorption and activated carbon regeneration were investigated and determined respectively. The flocculation settlement was measured by Zeta potential analysis, FESEM, laser particle size analysis and other modern analytical techniques. The mechanism of coagulation sedimentation and physical adsorption of activated carbon were preliminarily discussed. The experimental results and main conclusions were as follows: (1) flocculation sedimentation method was used to treat acrylic fiber spinning wastewater, and the turbidity of treated water sample was taken as the main index of investigation. PAC was selected as the most suitable flocculant. The optimum flocculation conditions were determined by single factor experiment and orthogonal experiment. The results of repeated experiments under optimized conditions showed that the average turbidity of treated water was 0.51NTU. The turbidity removal rate reached 86.64. (2) the flocculation sedimentation method was used to treat the acrylic spinning wastewater. PAC was used as flocculant, CPAM as coagulant aid, and the turbidity of treated water as the main index of investigation. Through single factor experiment and orthogonal experiment, the optimum conditions of coagulation sedimentation were determined. The results of repeated experiments under optimized conditions showed that the average turbidity of treated water sample was 0.22 NTU. Turbidity removal rate reached 96.30. (3) static physical adsorption of activated carbon:. Taking CODcr as the main index of investigation, through the comparative screening experiment, we determined the activated carbon (coal of raw material) as the more suitable physical adsorbent, investigated and determined the more suitable technology condition of the static adsorption of activated carbon. The results of repeated experiments showed that the average turbidity of treated water was 0.13 NTU1NTU, and the turbidity removal rate reached 97.81%. The average CODcr was 10.3mg L-150mg L -1, and the removal rate of CODcr reached 85.4%, which met the economic and technical requirements for the reuse of waste water. (4) the saturated activated carbon was regenerated by low temperature heating. It is determined that the regeneration method of activated carbon under low temperature heating is a suitable process condition for heating and regeneration in muffle furnace (air atmosphere). Under this condition, when the regeneration cycle is 1 ~ 3 times, The comprehensive recovery rate of regenerated activated carbon can reach more than 70%. (5) the treatment cost of "coagulation physical adsorption" process is preliminarily estimated. The results show that when the activated carbon is recycled four times, The cost of treating 1 ton of acrylic spinning wastewater is about 0.45 yuan, which shows a strong cost advantage.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X783.4

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