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Biosolids Treatment - Drying

Biosolids are the nutrient-rich organic materials resulting from the treatment of domestic sewage at a wastewater treatment facility. Through biosolids management, solid residue from wastewater treatment is processed to reduce or eliminate pathogens and minimize odors, forming a safe, beneficial product for reuse, in accordance with governmental regulations.

Biosolids can be applied as fertilizer to improve and maintain productive soils and stimulate plant growth. They also are used to fertilize gardens and parks and reclaim mining sites, or as fuel for gas or steam production.

Drying is a common method of reducing the volume and eliminating most of the moisture content of biosolids. Convection or conduction heat drying systems produce a granular or pelletized end product that meets US EPA “Class A” biosolids standards for safe reuse in land application.

At Siemens, our sludge dryers and drying filter presses have demonstrated proven performance in thousands of municipal and industrial applications.  Each offers its own merits as a stand-alone product, while creating additional synergy of cost-reduction and dewatering effectiveness when integrated into turnkey systems. Our systems include:

  • Convective thermal dryer
  • Triple-pass drum dryer
  • Single-pass drum dryer
  • Counter-rotating chamber dryer
  • Thin film dryer

Siemens provides pilot treatment systems and analytical testing to document the efficacy of treatment prior to installation. We also provide parts and service on all of our equipment, as well as equipment which may have been provided by other manufacturers.

 Biosolids 101
 Municipal Residuals Management & Biosolids Reduction

Case Study: Indirectly Heated Dryer Systems Turns Sludge into Usable Product

 In October 2003, Newport installed an indirect dryer called the Dragon Dryer® system from Siemens Water Technologies.  A belt press ahead of the dryer dewaters the sludge to about 16% solids.  The sludge cake then enters the dryer system, where it is dried to 90% or higher solids content.  The city has virtually eliminated sludge by transforming it into a safe, money-generating byproduct.

 Read Full Biosolids Drying Case Study

Biosolids Drying Case Study

Biosolids Drying Contact Surface Dryer System


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