乳化液废水深度回用处理研究

发布时间：2018-04-25 09:43

  本文选题：乳化液废水 + Fenton氧化　； 参考：《北京交通大学》2017年硕士论文

【摘要】：乳化液废水成分复杂(主要含油、乳化剂和表面活性剂),有机物含量高,油含量高,性质稳定,难降解,能长期滞留在水体和土壤中,污染强度大。因此,对乳化液废水进行零排放/回用深度处理具有重要意义。双膜技术作为高效深度处理技术,近年来在废水回用中得到广泛应用,然而膜技术在处理乳化液废水过程中形成的膜污染制约了它的工业化应用。本研究以北京生态岛物化车间乳化液废水收集、处理处置为基础,分析乳化液废水破乳后的水质特点,通过实验室小试,研究高级氧化-光合细菌(PSB)生化组合工艺强化双膜处理的效果及可行性,并采用动态超滤-反渗透膜研究了深度回用处理的可行性及稳定性。试验首先考察了超声波、臭氧、Fenton几种高级氧化技术对乳化液废水可生化性的影响,同时探讨了提高可生化性效果最佳的Fenton氧化技术的使用条件;再对Fenton氧化清液进行PSB生化处理,探究了光合细菌的生长规律及培养条件,考察光照、DO和HRT等条件对光合细菌处理废水效果的影响,并通过固定化方法强化光合细菌的处理;然后利用超滤-反渗透(UF-RO)进行深度处理,确定运行过程中温度、压力、清洗周期等工艺参数,分析双膜处理效果及膜污染状况。结果表明:(1)在提高破乳后的乳化液废水可生化性的效果上,Fenton氧化超声波氧化臭氧氧化。Fenton氧化体系不仅能提高废水的可生化性,还能降解去除废水中具发色基团的有机物质,使出水呈无色。当Fenton氧化初始pH为2.5,投加Fe2+为 2500 mg/L,[H202]/[Fe2+](mol/mol)比为 40,反应 1 h 后,在 pH 为 9.0～10.0 的条件下静置沉降,可以使废水的B/C由0.16提高到0.52,对废水CODCr的去除率为 60.8%。(2)试验对光合细菌生长规律及培养条件进行分析,确定了光合细菌的生长周期为7天左右,菌体的对数期在培养后的2-4天。对光合细菌生化处理Fenton氧化清液过程的调试和优化,确定在光照微曝气条件下,海藻酸钠包埋的光合细菌处理具有停留时间短、有机物降解效率高的效果。将海藻酸钠包埋的光合细菌与氧化清液按1:4的比例混合,调节混合液pH为7.0～8.0,在30℃恒温光照微曝气条件下,当水力停留时间为60h时,废水CODCr去除效果可以达到73.5%。(3)利用UF-RO处理光合细菌生化出水,结果表明运行膜污染主要为可逆污染。试验确定了系统运行的参数,超滤在进水压力0.1 MPa、进水流量1LPM、产水率90%的条件下常温、恒压错流过滤;反渗透在投加40 mg/L高盐阻垢剂、进水流量0.1 LPM、产水率50%的条件下恒速过滤,脱盐率达98.1%,硫酸根去除率为97.9%,总硬度去除率为99.5%。(4)以试验结果为基础,拟定乳化液废水采用Fenton光合细菌生化处理,生化出水采用UF-RO处理,组合技术可行,理效果。出水无色呈中性,CODCr从2224.3 mg/L降为63.7 mg/L,mg/L降至148.6mg/L,出水水质基本满足《再生水用作工业用(GBT 19923-2005)。
[Abstract]:The composition of emulsion wastewater is complex (main oil, emulsifier and surfactant, organic matter content is high, oil content is high, property is stable, difficult to degrade, can stay in water and soil for a long time, the pollution intensity is high. Therefore, it is of great significance to treat emulsion wastewater with zero discharge / reuse. As a high efficient advanced treatment technology, double membrane technology has been widely used in wastewater reuse in recent years. However, membrane fouling in the treatment of emulsion wastewater has restricted its industrial application. Based on the collection and treatment of emulsion wastewater in Beijing Ecological Island Physico-chemical Workshop, the characteristics of emulsion wastewater after demulsification were analyzed. The effect and feasibility of advanced oxidation-photosynthetic bacteria PSB-biochemistry combination process to enhance the treatment of double membrane were studied, and the feasibility and stability of deep reuse treatment were studied by using dynamic ultrafiltration reverse osmosis membrane. The effects of ultrasonic and ozone Fenton advanced oxidation technologies on the biodegradability of emulsion wastewater were investigated. At the same time, the application conditions of Fenton oxidation technology with the best biodegradability were discussed. Then the PSB biochemical treatment was carried out on the Fenton oxidation liquid, and the growth law and culture conditions of photosynthetic bacteria were studied. The effects of light, do and HRT on the treatment of photosynthetic bacteria wastewater were investigated, and the treatment of photosynthetic bacteria was strengthened by immobilization method. Then the ultrafiltration and reverse osmosis (UF-ROA) were used for advanced treatment to determine the process parameters such as temperature, pressure, cleaning period and so on, and to analyze the effect of double membrane treatment and membrane fouling. The results show that Fenton oxidation ultrasonic oxidation ozone oxidation. Fenton oxidation system can not only improve the biodegradability of wastewater, but also degrade and remove organic substances with chromophore in the emulsion wastewater after demulsification. Make the water colorless. When the initial pH of Fenton oxidation is 2.5, the addition of Fe2 is 2500 mg / L, the ratio of [H202] / [Fe2] mol / mol / mol) is 40, after 1 hour reaction, the sedimentation is static at pH 9.0 ~ 10.0. The B / C of wastewater was increased from 0.16 to 0.52, and the removal rate of CODCr from wastewater was 60.8. The growth rule and culture conditions of photosynthetic bacteria were analyzed. The growth cycle of photosynthetic bacteria was about 7 days, and the logarithmic period of bacteria was 2-4 days after culture. The adjustment and optimization of the process of Fenton oxidation solution by biochemical treatment of photosynthetic bacteria showed that under the condition of light and micro-aeration, the treatment of photosynthetic bacteria embedded with sodium alginate had the effect of short residence time and high degradation efficiency of organic matter. The photosynthetic bacteria entrapped with sodium alginate were mixed with the oxidized liquid at 1:4, and the pH of the mixed solution was adjusted to 7.0 ~ 8.0. Under the condition of 30 鈩，

本文编号：1800823