Continuous Thermal Hydrolyses: The Key for Wastewater Power Plants

Description:The next generation of Municipal WWTPs will change public perception of waste management from NIMB to pride. Plants will become source of nutrients, bio-energy, heat and potentially bio-plastics. These bio-refineries incorporate features reducing life cycle costs and carbon footprint. When developing solutions to reduce energy costs and carbon footprint, WWTP's operators are generally faced with two options - use less energy and/or produce more energy. While improvements in aeration, pumping and process control are leading to lower energy consumption, biosolids represent a great source for energy production. Enhanced biosolids digestion has now become the benchmark for energy recovery from biosolids with thermal hydrolysis being recognized as the most reliable and effective pretreatment solution for enhanced digestion. Thermal hydrolysis provides a Class A product with high solubilized COD. Currently available thermal hydrolysis systems operate in batch mode which leads to sub-optimal energy utilization and over-sizing of key equipment. Their capital and operational costs have restricted their application to mainly very large WWTPs. The development of continuous thermal hydrolysis process is a revolution in thermal hydrolysis - making it more efficient, more cost effective and more attractive for a wider range of treatment facilities. Over the past 3 years continuous thermal hydrolysis process has been tested in pilot scale and the first reference plant is now in operation in Denmark. This paper will introduce the concept of WWTP using continuous thermal hydrolysis process and present operating results of existing installations, and finally present some insights into the future of Biosolids management.

Authors: Cabral, Christian

Subjects: Wastewater

Tags:ac2012

Citation:2012 BCWWA Annual Conference, Session 16, Penticton

Publication Date:Jul 1st, 2012 Upload Date:Jul 1st, 2012

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