【作者】 徐金兰；

【导师】 张敬东；

【作者基本信息】 武汉大学 ， 环境工程， 2004， 硕士

【摘要】 通过发酵工艺生产乳酸排放的废水含有高浓度的可生物降解的有机物,这些有机物多以碳水化合物及其降解产物为主,而且乳酸生产工艺过程中设备的清洗还会造成乳酸废水中含盐量突然增加。 本文以乳酸废水为研究对象,针对乳酸废水有机物含量高、pH值低以及无机盐含量变化大的特点,在实验室条件下,研究了SBR工艺对有机物的去除效果的影响,其中着重考察了温度、进水COD、微生物浓度、pH值以及进水方式等对乳酸废水中有机物去除效果以及活性污泥性能的影响;通过正交试验,探讨了最佳运行操作模式,并研究了无机盐对有机物去除效果及活性污泥性能的影响。试验结果表明:1、温度控制在16℃～30℃,生物量浓度为3000mg/L左右,有机物去除率高达90%以上;2、适量生活污水的加入可以改善出水效果和污泥性能;3、进水pH值可以控制在4.5左右,可以节约调节pH值用碱量,污泥经过一段时间驯化后处理酸性废水的能力增强;4、未经驯化的活性污泥对NaCl、Na₂SO₄都具有一定的容忍性,其极限允许浓度分别为4.5g/L、7.0g/L,而且NaCl对系统的阻害作用比Na₂SO₄对系统的阻害作用大;5、最佳运行工况为:进水,厌氧1小时,搅拌1.5小时,曝气5小时,沉降1小时,闲置半小时。更多还原

【Abstract】 Lactic acid was produced by fermentation, during which there produced many wastewater containing a great deal of organism with good biologization which are mainly composed of carbon - water compound and its outcome, and with high concentration of salt from cleaning equipment.This paper studies on the effect of the techniques of sequencing batch reactor on the degradation effect of the organism according to lactic acid wastewater with high concentration of organism、 low pH as well as its variety of the salt. In the laboratory the effect factors such as the temperature of the wastewater、 COD of the entering water、 the concentration of activated sludge, pH, the manner of inlet water and so on were given emphasis on; The best working procedure was probed into by orthodox experiment; And it was also investigated how the abio-salt affected the degree of the organism degradation and the performance of the activated sludge. It was shown firstly when the temperature ranged from 16°C to 30°C and the concentration of the activated sludge was about 3000mg/L, the efficiency of the organism degradation were above 90%; Secondly when the activated sludge was undomesticated, the pH of the entering water was controlled with a value of 4.5 so as to economize the dosage of alkali which were used to adjust the pH of the wastewater, After it was domesticated, the treatment ability of the activated sludge to the acid wastewater was enhanced; Thirdly the best working procedure was that after entering water, anaerobic time、 milling time、aerobic time、 sedimentation time and retention time were 11k 1.51k 51k 11k 0.5h respectively; Fourthly undomesticated activated sludge had some enduring capacity on NaCl、 Na₂SO₄ with the utmost concentration of 4.5g/L、 7.0g/L, and the harm to the system of NaCl exceeded that of Na₂SO₄; Lastly entering some municipal wastewater can improve the effect of the out water and activated sludge performance.更多还原