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Vermicomposting is at suitable methods for stabilization and converting of sewage sludge into useful products. To investigate the effects of bulking material on vermicompost quality, an experiment was conducted in a factorial design with three replications. In this experiment, the final dried sludge in lagoons was mixed with bulking materials (woodchips, three leaves, and wheat straw) in four mixing proportion with swage sludge (0, 15, 30 and 45%, V/V). Chemical properties of bulking materials, sewage sludge, and produced vermicomposts were determined. Vermicomposts had relatively low pH and electrical conductivity (EC). The nutrients content of vermicompost, especially N, P, Fe, and Zn, were high. These properties showed its suitable quality for use in agriculture. Heavy metals concentrations of vermicomposts, except Zn, were lower than recommended values by EPA. Mixing of Bulking materials with sewage sludge decreased pH, N, Pb, Co, and Cd, but increased Ca, Mg, Fe, Cu, Mn, Zn, and Ni content of produced vermicomposts. In most cases, the concentrations of nutrients were higher in 30% mixing proportion. Therefore, 30% (v/v) mixing of bulking material with sewage sludge is recommended for vermicompost production. A vermicompostagem é um métodos adequados para a estabilização e conversão de lodo de esgoto em produtos úteis. Para investigar o efeito de aumentar o volume de material sobre a qualidade do vermicomposto, foi conduzido um experimento em esquema fatorial com três repetições. Neste experimento, o lodo final seco em lagoas foi misturado com materiais de volume (lascas de madeira, três folhas e palha de trigo) em quatro proporções de mistura (0, 15, 30 e 45% V / V) com lodo de esgoto. Propriedades químicas dos materiais de amontoamento, lodo de esgoto e vermicompostos produzidos foram determinados. Vermicomposto apresentaram pH relativamente baixo e CE. O seu teor de nutrientes, especialmente N, P, Fe e Zn foram elevados. Essas propriedades mostrou sua qualidade adequada para utilização na agricultura. Concentrações de metais pesados de vermicompostos, com exceção do zinco, foram menores do que os valores recomendados pela EPA. A mistura de materiais Bulking com lodo de esgoto diminuiu o pH, N, Pb, Co e Cd, mas aumentou a concentração de Ca, Mg, Fe, Mn, Cu, Zn, Ni no vermicomposto produzido. Na maioria dos casos, as concentrações de nutrientes foram maiores na proporção de 30% de mistura Portanto, recomenda-se a mistura de materiais ao lodo na proporção de 30% para a produção de vermicomposto

Contribution of organic bulking materials on chemical quality of sewage sludge vermicompost