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>Process optimization and effect of thermal, alkaline, H 2 O 2 oxidation and combination pretreatment of sewage sludge on solubilization and anaerobic digestion
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Process optimization and effect of thermal, alkaline, H 2 O 2 oxidation and combination pretreatment of sewage sludge on solubilization and anaerobic digestion
This study investigated the feasibility of enhancing anaerobic digestion of sewage sludge with triple, dual, and individual pretreatment of waste activated sludge with heat, alkalinity, and hydrogen peroxide. These pretreatments disrupt sludge flocs, organisms’ cell walls, extracellular polymeric substance, and intracellular organic matter, which increase biodegradability and hydrolysis rate of activate sludge. In addition, the influence of various variables on methane production was analyzed using the response surface methodology with the quadratic model. Eventually, an optimized temperature and chemical concentration for the highest methane production and lowest chemical usage is suggested. The highest amount of methane production was obtained from the sludge pretreated with triple pretreatment (heat (90?°C), alkaline (pH?=?12), and hydrogen peroxide (30?mg H2O2/g TS)), which had better performance with 96% higher methane production than that of the control sample with temperature of 25?°C approximately and a pH?=?8. Response surface methodology with a quadratic model was also used for analyzing the influence of temperature, pH, and hydrogen peroxide concentration on anaerobic digestion efficiency. It was revealed that the optimized temperature, pH, and hydrogen peroxide concentration for maximizing methane production and solubilization of sludge and minimizing thermal energy and chemical additives of the pretreatments are 83.2?°C, pH?=?10.6 and 34.8?mg H2O2/g TS, respectively, has the desirability of 0.67. This study reveals that triple pretreatment of waste activated sludge performed better than dual and individual pretreatment, respectively, in all desirable output parameters including increasing methane production as the most important output, increasing in COD solubilization, protein and polysaccharide, and decreasing in VSS solubilization.
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机译：本研究调查了增强厌氧消化污泥的可行性，以热，碱度和过氧化氢的废物活性污泥的三倍，双重和单独预处理。这些预处理破坏了污泥絮状物，生物体的细胞壁，细胞外聚合物物质和细胞内有机物，这增加了活性污泥的生物降解性和水解速率。此外，使用与二次模型的响应面方法分析各种变量对甲烷产生的影响。最终，提出了最优化的甲烷生产和最低化学用途的优化温度和化学浓度。从具有三重预处理的污泥（热（90Ω·℃），碱性（pHα=β12）和过氧化氢（30×Mg H 2 O 2 / G TS））的污泥获得最高量的甲烷生产。性能具有96％的甲烷产生，比对照样品的温度约为25Ω°C和pH值，pH？=？8。用二次模型的响应表面方法也用于分析温度，pH和过氧化氢浓度对厌氧消化效率的影响。揭示了优化的温度，pH和过氧化氢浓度，用于最大化污泥的甲烷生产和溶解和最小化预处理的热能和化学添加剂是83.2℃，pH？= 10.6和34.8？Mg H 2 O 2 / g分别具有0.67的可取性。本研究表明，在所有所需输出参数中，分别在所有所需的输出参数中表现出的废物活性污泥的三重预处理，包括将甲烷产量增加，作为最重要的输出，COD溶解，蛋白质和多糖的增加，以及对VSS溶解的降低。
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