活性污泥吸附联合发酵产酸资源化回收污水碳源

利用活性污泥源头吸附回收污水中的有机碳源，然后进行厌氧发酵产酸，可以改变污水碳源在传统工艺中的迁移与转化途径。研究结果表明，本工艺大大提高了有机碳源的利用率，降低了后续水解释碳成本。在30 min内，活性污泥对污水COD、氨氮和总磷的吸附去除率分别达到69%、57%和58.2%。热碱水解（t=90℃，pH=11）能够实现吸附碳源污泥（富碳污泥）中有机物的快速释放，水解污泥上清液中COD、溶解性蛋白质和溶解性多糖含量分别达到8 173.8、1 508.8和1 936.0 mg·L-1。将获得的有机物进行厌氧发酵产酸，挥发性有机酸总量达到6 025.4 mg·L-1，与普通活性污泥相比，提高了27.7%；但是有机酸的组成和发酵所需时间变化不大。本研究结果为污水处理厂节能降耗以及污泥资源化处理处置提供参考。

Combination of activated sludge adsorption and anaerobic fermentation to recycle wastewater carbon source

The migration and transformation routes of wastewater carbon source in conventional wastewater treatment processes can be changed by using activated sludge to absorb the organic carbon source from wastewater for the anaerobic fermentation to produce acids. The experimental results showed that this technology was able to significantly improve the utilization rate of wastewater carbon source and reduce the cost of subsequent hydrolysis. Within 30 minutes, the removal efficiencies of COD, ammonia and total phosphorus from wastewater by activated sludge adsorption were up to 69%, 57% and 58.2%, respectively. Under the hydrolysis conditions of 90℃ and pH 11, the carbon adsorbed to activated sludge (carbon-rich sludge) could be quickly released, and the concentrations of COD, soluble protein and soluble polysaccharide in the hydrolysis solution were about 8 173.8, 1 508 and 1 936.0 mg·L-1, respectively. Through the anaerobic fermentation of the released carbon, the concentration of total volatile fatty acids (TVFAs) was 6 025.4 mg·L-1, increased by 27.7% in comparison to the common activated sludge method. However, there was not a significant change for the composition of VFAs and the fermentation time. The findings of this study could provide important experiences for the energy saving in wastewater treatment plants and the recycling treatment and disposal of sludge.