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首页> 外文期刊>Separation and Purification Technology >Exploring the efficacy and mechanism of tannic acid/Fe3+ conditioning for enhancing waste activated sludge dewaterability
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Exploring the efficacy and mechanism of tannic acid/Fe3+ conditioning for enhancing waste activated sludge dewaterability

机译：探索单宁酸/ Fe3 +调理以增强废物活性污泥脱水性的疗效和机制

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摘要

Waste activated sludge (WAS), as a kind of hydrophilic colloid substance, is still a major technical challenge in wastewater treatment industry. For enhancing WAS dewaterability, the approach of tannic acid (TA)/Fe3+ conditioning was verified to be feasible. During conditioning, sludge extracellular protein decreased pronouncedly. fluorescence quenching analysis revealed that Fe3+ reduced the binding sites of extracellular polymeric substances available for TA, and the formed TA-Fe3+ complexes possibly promoted TA aggregates' settlement and compression. Sludge supernatant viscosity, absolute value of zeta potential and pH value also decreased distinctly, and sludge particle size became larger than that of raw sludge or Fe3+-conditioned sludge. Scanning electron microscope suggested that sludge surface morphology became more compacted and denser after TA/Fe3+ conditioning, which was helpful for the release of water trapped in sludge bio-polymeric network. With 0.15 mmol/gTS TA and 0.9 mmol/gTS Fe3+ conditioning, sludge capillary suction time, specific resistance of filtration and water content of dewatered sludge cake were decreased by 76.3%, 94.7% and 13.5%, respectively. The findings not only shed new light on the means of applying natural plant organic polymer coupled with inorganic cation to promote WAS dewaterability but offered a potentially theoretical principle of the utilization of plant waste containing TA in WAS treatment.
机译：作为一种亲水性胶体物质，废物活性污泥（是）仍然是废水处理行业的主要技术挑战。为了增强是脱水性，核实单宁酸（TA）/ Fe3 +调理的方法是可行的。在调理过程中，污泥细胞外蛋白均下降。荧光猝灭分析表明，Fe3 +还原了可用于Ta的细胞外聚合物物质的结合位点，并且形成的TA-Fe3 +络合物可能促进了Ta骨料的沉降和压缩。污泥上清液粘度，Zeta电位的绝对值和pH值也明显降低，污泥粒度比原料污泥或Fe3 + - 监控污泥的污泥尺寸大。扫描电子显微镜表明，TA / Fe3 +调理后污泥表面形态变得更加压实和更密集，这有助于捕获在污泥生物聚合物网络中的水。用0.15mmol / GTS TA和0.9mmol / GTS Fe3 +调节，污泥毛细管吸入时间，脱水污泥饼的脱水滤饼的特异性阻力分别下降76.3％，94.7％和13.5％。该研究结果不仅赋予了应用天然植物有机聚合物的方法，其与无机阳离子相结合，以促进脱水性，但提供了含有TA的植物废物的潜在理论原理。

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