發(fā)布時間：2018-02-17 03:24

  本文關鍵詞： 反滲透濃水 焦化廢水 真空膜蒸餾 Fenton氧化 石灰/純堿軟化　出處：《山東建筑大學》2017年碩士論文　論文類型：學位論文

【摘要】：焦化廢水是煤化工生產(chǎn)過程中產(chǎn)生的污水,雙膜工藝(微濾/超濾-反滲透)在焦化廢水深度處理方面得到廣泛應用,然而反滲透的產(chǎn)水率只有70%~75%,會產(chǎn)生25%~30%的反滲透濃水。隨著工業(yè)污水“零排放”要求的提出,尋求處理效果更好、工藝穩(wěn)定性更強、運行費用更低的反滲透濃水處理工藝,實現(xiàn)廢水零排放目標,已經(jīng)成為煤化工發(fā)展的自身需求和外在要求。論文以華北某焦化企業(yè)污水深度處理站反滲透濃水為研究對象,開展焦化反滲透濃水的膜蒸餾處理實驗室試驗研究,探索構(gòu)建預處理+膜蒸餾的組合處理工藝,主要研究結(jié)論如下:采用石灰/純堿軟化法對焦化反滲透濃水進行軟化處理可有效降低原水硬度。當原水硬度為763.4mg/L,Ca(OH)_2投加量為400mg/L、Na_2CO_3投加量為720mg/L、總硬度去除率為68.3%,總硬度下降為242.0mg/L,噸水處理藥劑費用為1.17元。Fenton氧化法相對于粉末活性炭吸附法,具有去除效率高、藥劑費用低等優(yōu)點,可有效降低焦化反滲透濃水中有機物含量。當原水CODcr為308.3mg/L,在pH為4、H_2O_2/CODcr質(zhì)量比為1:1、H_2O_2/Fe2+摩爾比為20:1條件下,CODcr去除率為53.73%,噸水處理藥劑費用約為1.4元。真空膜蒸餾法可有效處理焦化反滲透濃水,適宜的工藝運行參數(shù)為進料溫度60℃、冷側(cè)真空度0.095Mpa、進料流量1.5L/min;試驗中膜蒸餾出水TDS去除率高達99.9%,CODcr去除率在90%以上,電導率穩(wěn)定在10 us/cm以下。反滲透濃水經(jīng)預處理的膜蒸餾對比試驗結(jié)果顯示,軟化+Fenton氧化+真空膜蒸餾組合工藝具有良好處理效果,膜蒸餾過程中產(chǎn)水通量衰減變緩,出水CODcr20mg/L,TDS10mg/L,電導率10us/cm,出水水質(zhì)優(yōu)良,是可行的焦化反滲透濃水處理工藝。膜清洗研究結(jié)果表明,采用鹽酸、EDTA、次氯酸鈉對膜組件進行組合清洗,最高可恢復93%的膜通量。
[Abstract]:Coking wastewater is a kind of wastewater produced in coal chemical industry. The dual-membrane process (microfiltration / ultrafiltration reverse osmosis) is widely used in advanced treatment of coking wastewater. However, the water production rate of reverse osmosis is only 70%, which will produce 25% 30% of concentrated reverse osmosis water. With the requirement of zero discharge of industrial sewage, the process of treating concentrated reverse osmosis water with better treatment effect, stronger process stability and lower operating cost will be sought. Realizing the zero discharge target of wastewater has become the demand and external requirement of coal chemical industry development. In this paper, the reverse osmosis concentrated water of a coking plant sewage treatment plant in North China is taken as the research object. The experimental study on membrane distillation treatment of concentrated water from reverse osmosis of coking plant was carried out, and the combined treatment process of pretreatment membrane distillation was explored. The main conclusions are as follows: the hardness of raw water can be effectively reduced by lime / soda softening method in the treatment of thick reverse osmosis water of coking plant. When the hardness of raw water is 763.4 mg / L, the addition amount is 400mg / L / L / L / L / L / s / L / s / s / s / s / s / s / s / s / s, the total hardness removal rate is 68.3mg / L, and the total hardness is 68.3mg / L, respectively, and the total hardness removal rate is 68.3mg / L and the total hardness removal rate is 68.3%. The degree dropped to 242.0 mg / L, and the cost of water treatment was 1.17 yuan. Fenton oxidation was compared with powder activated carbon adsorption. It has the advantages of high removal efficiency, low cost and so on. When the CODcr of raw water is 308.3 mg / L, the removal rate of CODcr is 53.73 and the cost of water treatment is about 1.4 yuan under the condition that the mass ratio of the raw water is 308.3 mg / L, and the mass ratio of 1: 1 / C / CODcr is 1: 1. The ratio of Fe2 / Fe2 is 20: 1. Treatment of reverse osmosis concentrated water in coking plant, The suitable process parameters are feed temperature of 60 鈩，

本文編號：1517104