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Using sulfite pretreatment to improve the biodegradability of waste activated sludge

机译：采用亚硫酸盐预处理改善废物活性污泥的生物降解性

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This study presents a novel strategy to improve the biodegradability of waste activated sludge (WAS) based on sulfite pretreatment. Experiments were conducted to demonstrate the effects of sulfite on the WAS and its biodegradability by sulfite pretreatment. The results show that the concentration of the released substrate in the sulfite (0.2–0.48 g S L ~(?1) ) pretreated WAS increased 2–5 times after 12–36 h, at a pH of 5–7, compared with the WAS without pretreatment. The concentration of soluble chemical oxygen demand (SCOD) produced had a strong correlation with the concentration of sulphurous acid (H _(2) SO _(3) ), suggesting that H _(2) SO _(3) may directly cause the lysis of microorganisms in WAS. Biogenic sulfide production (BSP) was applied for the assessment of anaerobic biodegradability. The results indicated that the biodegradability of the WAS after sulfite pretreatment improved by approximately 51% compared with the control system. Moreover, the rate of sulfate/sulfite reduction in the Experimental reactor was 1.62 times higher than the value in the Control reactor, thereby further confirming the improvement observed in the biodegradability of the sulfite pretreated WAS. The released substrates and produced sulfide can be further applied as renewable sources of energy.
机译：本研究提出了一种新的策略，提高废物活性污泥（AS）的生物降解性基于亚硫酸亚硫酸盐预处理。进行实验以证明亚硫酸盐对亚硫酸盐预处理的影响及其生物降解性。结果表明，亚硫酸盐中释放的基材的浓度（0.2-0.48g sl〜（β1））在12-36小时后，在5-7的pH值后，在12-36小时后增加2-5次，而是没有预处理。所产生的可溶性化学需氧量（SCOC）的浓度与硫酸浓度强烈相关（H _（2）所以_（3）），表明H _（2）所以_（3）可以直接导致微生物的裂解是。将生物硫化物生产（BSP）应用于厌氧生物降解性的评估。结果表明，与对照系统相比，亚硫酸盐预处理后的生物降解性约为51％。此外，实验反应器中的硫酸盐/亚硫酸盐的速率比对照反应器中的值高1.62倍，从而进一步证实在预处理的亚硫酸盐的生物降解性中观察到的改善。释放的基材和产生的硫化物可以进一步应用于可再生能源。

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