Jabari Pouria, Yuan Qiuyan, Oleszkiewicz Jan A
a Department of Civil Engineering , University of Manitoba , Winnipeg , Canada.
Environ Technol. 2018 Sep;39(18):2390-2410. doi: 10.1080/09593330.2017.1355934. Epub 2017 Sep 11.
The potential of hydrolysis/fermentation of activated sludge in sludge holding tank (SHT) to produce additional carbon for the biological nutrient removal (BNR) process was investigated. The study was conducted in anaerobic batch tests using the BNR sludge (from a full-scale Westside process) and the mixture of BNR sludge with conventional non-BNR activated sludge (to have higher biodegradable particulate chemical oxygen demand (bpCOD) in sludge). The BioWin 4.1 was used to simulate the anaerobic batch test of the BNR sludge. Also, the overall effect of FCOD production and nutrient release on BNR efficiency of the Westside process was estimated. The experimental results showed that the phosphorous uptake of sludge increased during hydrolysis/ fermentation condition up to the point when poly-P was completely utilized; afterwards, it decreased significantly. The BioWin simulation could not predict the loss of aerobic phosphorous uptake after poly-P was depleted. The results showed that in the case of activated sludge with relatively higher bpCOD (originating from plants with short sludge retention time or without primary sedimentation), beneficial effect of SHT on BNR performance is feasible. In order to increase the potential of SHT to enhance BNR efficiency, a relatively low retention time and high sludge load is recommended.
研究了污泥储存罐（SHT）中活性污泥水解/发酵为生物营养物去除（BNR）工艺产生额外碳源的潜力。该研究采用厌氧批次试验，使用BNR污泥（来自全尺寸西区工艺）以及BNR污泥与传统非BNR活性污泥的混合物（以使污泥中具有更高的可生物降解颗粒化学需氧量（bpCOD））。使用BioWin 4.1模拟BNR污泥的厌氧批次试验。此外，还估算了溶解性化学需氧量（FCOD）产生和养分释放对西区工艺BNR效率的总体影响。实验结果表明，在水解/发酵条件下，污泥的磷吸收量增加，直至聚磷被完全利用；此后，磷吸收量显著下降。BioWin模拟无法预测聚磷耗尽后好氧磷吸收的损失。结果表明，对于具有相对较高bpCOD的活性污泥（来自污泥停留时间短或没有初沉池的工厂），SHT对BNR性能具有有益影响是可行的。为了提高SHT增强BNR效率的潜力，建议采用相对较短的停留时间和较高的污泥负荷。
