高浓酵母废水中焦糖色素的提取及对污染负荷的影响

Extraction of Caramel Pigment from High-Concentration Yeast Wastewater and its Influence on Pollution Load

为明确高浓酵母废水中焦糖色素对污染负荷的影响,采用超滤浓缩分离法提取高浓酵母废水中的焦糖色素,考察了所提取的焦糖色素的性质、处理前后废水污染性质的变化及其对后续厌氧处理的影响.结果表明:高浓酵母废水中的焦糖色素可提取出来进行资源化利用,其提取得率为15 g/L,提取出的焦糖色素品质达到国家标准;高浓酵母废水经提取焦糖色素后,废水的COD_(Cr)和色度大幅度降低,污染负荷明显下降,可生化性能提高,COD_(Cr)/BOD5比由0.33增加到0.51,从而大幅度提高了后续厌氧处理工艺的效率.文中结果为高浓发酵废水的资源化利用及有效处理提供了一种新的技术路线.

In order to determine the effect of the caramel pigment on the pollution load in high-concentration yeast wastewater,the caramel pigment in the high-concentration yeast wastewater was extracted by means of ultrafiltration membrane separation. Then,the properties of the caramel pigment were investigated,and the influence of the extraction on both the pollution load and the subsequent anaerobic treatment was also explored. The results show that the caramel pigment in the high-concentration yeast wastewater can be extracted for the utilization of resource,with an extraction ratio of 15 g/L and an appearance quality which is up to the national standard. After the extraction,the COD_（Cr）and color of the wastewater and the pollution load significantly decrease,while the biodegradability of COD_（Cr）/BOD5 increases from 0. 33 to 0. 51,and thus the efficiency of the subsequent anaerobic treatment is greatly improved. The research results can provide a new technical route for the resource utilization and effective treatment of high-concentration fermentation wastewater.