好氧颗粒污泥处理高含盐废水研究

试验采用序批式摇床反应器(SSBR)在高含盐废水中利用不同类型接种污泥培养出了好氧颗粒.结果表明,好氧颗粒污泥能够有效处理高含盐废水并且具有很好的抗盐度冲击能力.当废水盐度小于10 g/L NaCl并且进水基质为葡萄糖时,利用好氧颗粒污泥处理该废水可以取得70.3%～97.6%的TOC去除率.当进水盐度达到35 g/L NaCl并且进水基质为难降解Vc废水时,利用好氧颗粒污泥处理该含盐废水能够取得与相同基质相同运行条件下淡水废水中相似的70%的TOC去除率.试验在含盐废水中得到了粒径为0.5～3 mm的好氧颗粒污泥,其沉降速度大大高于淡水对照组中得到的好氧颗粒污泥沉降速度.相对淡水对照组中好氧颗粒污泥,含盐废水中好氧颗粒具有污泥产率更低、污泥活性(OUR)更高、颗粒稳定性更好的优势.从不同接种污泥类型来看,好氧絮状污泥和厌氧颗粒污泥接种都能快速实现污泥好氧颗粒化,但絮状污泥接种实现好氧颗粒化所需的时间更短.另外,在相同运行条件下,接种好氧絮状污泥反应器取得的TOC去除效果优于接种厌氧颗粒污泥反应器,但厌氧颗粒污泥接种具有更强的抗盐度冲击能力.

Experimental Investigation of High Saline Wastewater Treatment Using Aerobic Granules

Complete aerobic granulation could be achieved in shaking sequencing batch reactors (SSBR) with saline wastewater respectively inoculated conventional activated sludge and anaerobic granules. Pretty good specific TOC removal rates could be achieved without inoculating the halo-bacteria at the start-up time. When the salinity was less than 10g/L NaCl with the synthetic glucose-rich wastewater as substitute, the TOC removal efficiency was in the range of 70.3%~97.6%. After the salinity was 35g/L NaCl and the influent was completely changed to Vc wastewater as substrate, similar TOC removal efficiency about 70% could be achieved compared with the performance of fresh Vc wastewater treatment under the same condition. The granules in saline wastewater had a diameter of 0.5~3mm, and saline aerobic granules had much higher settling velocity, higher oxygen utilization rate (OUR), lower sludge production and better structural integrity than those of the granules from fresh wastewater. Saline aerobic granules showed perfect protecting-ability against the saline shock and could quickly recover from long term sharp saline change. Due to the different sludge inoculation, the aerobic granules from aerobic flocs had superior TOC removal performance and inferior saline shock protecting-ability compared with the aerobic granules from anaerobic granules.