INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada.
School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, China.
Bioresour Technol. 2020 May;303:122954. doi: 10.1016/j.biortech.2020.122954. Epub 2020 Feb 4.
Economic assessment of bio-flocculant production process has been carried out by SuperPro Designer where extracellular-polymeric substances (EPS) were produced using activated sludge fortified with crude glycerol in fermenter followed by centrifugation. Considering EPS concentration of 60 g/L in production fermenter at 96 h, the unit production cost for slime EPS was estimated to be $ 0.95/L. The unit price of S-EPS was sensitive to inoculum size and EPS productivity (EPS concentration and fermentation time) in the fermented broth. Economic analysis was also conducted for EPS aided leachate treatment. The unit leachate treatment cost was 7.78 $/m and was sensitive to S-EPS unit production cost. To get same leachate treatment cost as current industrial practice (4 $/m), S-EPS unit production cost should lower down to $ 0.5/L. The process has several advantages: 1) sludge and crude glycerol valorization for bio-flocculant production 2) Leachate treatment using environment friendly bio-flocculant.
已通过 SuperPro Designer 对生物絮凝剂生产工艺进行经济评估，该工艺使用在发酵罐中用粗甘油强化的活性污泥来生产胞外聚合物（EPS），然后进行离心。考虑到生产发酵罐中 96 小时时 EPS 的浓度为 60 g/L，估算出污泥 EPS 的单位生产成本为 0.95 美元/升。S-EPS 的单价对接种物规模和发酵液中 EPS 生产力（EPS 浓度和发酵时间）敏感。还对 EPS 辅助渗滤液处理进行了经济分析。单位渗滤液处理成本为 7.78 美元/立方米，对 S-EPS 单位生产成本敏感。要使渗滤液处理成本与当前工业实践（4 美元/立方米）相同，S-EPS 的单位生产成本应降低至 0.5 美元/升。该工艺具有以下几个优点：1）污泥和粗甘油的增值用于生物絮凝剂生产；2）使用环保的生物絮凝剂处理渗滤液。
