Primary Sewage Sludge Treatment Using A Spiral Support System

Abstract

Sewage sludge (wastewater treatment solids) is an organic and nutrient resource that is generated during wastewater treatment and is utilized as biosolids in landfills, fertilizer, or compost it requires treatment to reduce the microbial load and the concentration of organic matter and pollutants such as metals. Aerobic digestion has been used for the stabilization of sewage sludge, and the use of biodiscs has been limited to primary sewage rather than sewage sludge. Therefore, this paper shows that the primary sewage sludge from a previously sonicated municipal sewage treatment plant can be stabilized using a spiral support biodisc, which is shown to be an effective mechanism with which to reduce the concentration of pathogenic microorganisms in residual sludge and also reduce the concentration of organic carbon, ammonia-nitrogen (NH3-N), and soluble phosphorus. The experimental results using the spiral support biodisc are better compared to those using the conventional biodisc.

Keywords

• primary sewage sludge, fecal coliforms, stabilization, conventional biodisc, spiral support biodisc