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Effects of agricultural waste-based conditioner on ultrasonic-aided activated sludge dewatering

机译：农业废弃物基调质剂对超声辅助活性污泥脱水的影响

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The effects of agricultural wastes on ultrasonic-aided activated sludge dewaterability were investigated in this study. Wheat straw powder (WSP), corn stalk powder (CSP) and rice hull powder (RHP) were used as physical conditioners. Several indicators, including capillary suction time (CST), specific resistance to filtration (SRF) and the dewatering process were adopted to characterize the sludge dewaterability. Soluble protein and filtrate polysaccharide were also characterized to estimate their function on sludge dewatering. The results showed that sludge dewaterability was greatly improved by adding WSP or CSP under an ultrasonic intensity of 28 kHz. The SRF was reduced from 1.0 x 10(9) S-2 g(-1) to 0.4 x 10(9) S-2 g(-1) (or less) with a dosage of more than 0.75 g/g dry solid (DS). The moisture content of the sludge cake decreased from 93% to 80% and from 94% to 79% by adding WSP and CSP with ultrasonication. However, no visible enhancements were observed in sludge dewaterability by adding RHP. Moreover, the addition of these agricultural wastes contributed to an increase in the high heating value of dewatered sludge, and ultrasonication further improved the sludge low heating value by reducing the moisture content. The synergistic mechanism of sludge conditioned by agricultural wastes and ultrasonication was attributed to agricultural wastes forming a permeable and rigid lattice structure and ultrasonication cracking the sludge structure.
机译：本研究探讨了农业废弃物对超声辅助活性污泥脱水性能的影响。小麦秸秆粉（WSP），玉米秸秆粉（CSP）和稻壳粉（RHP）被用作物理调理剂。污泥的脱水能力表征采用了几种指标，包括毛细管抽吸时间（CST），比过滤阻力（SRF）和脱水过程。还对可溶性蛋白和滤液多糖进行了表征，以评估其在污泥脱水中的功能。结果表明，在28 kHz的超声强度下，加入WSP或CSP可大大提高污泥的脱水性。 SRF从1.0 x 10（9）S-2 g（-1）减少到0.4 x 10（9）S-2 g（-1）（或更小），剂量大于0.75 g / g干固体（DS）。通过超声处理添加WSP和CSP，污泥饼的水分含量从93％降低到80％，从94％降低到79％。但是，通过添加RHP，没有观察到污泥脱水性的明显增强。此外，添加这些农业废物有助于提高脱水污泥的高热值，并且超声处理通过减少水分含量进一步提高了污泥的低热值。农业废料和超声处理对污泥的协同作用机理归因于农业废料形成了可渗透的刚性晶格结构，超声处理使污泥结构开裂。

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