Abstract
Improving energy efficiency of WWTPs (Waste Water Treatment Plants) is crucial action of modern wastewater treatment technology. Technological treatment process optimization is important but the main goal will not be achieved without increasing production of renewable energy from sewage sludge in anaerobic digestion process which is most often used as sludge stabilization method on large WWTP's. Usually, anaerobic digestion reactors used for sludge digestion were designed with reserve and most of them is oversized. In many cases that reserve is unused. On the other hand, smaller WWTPs have problem with management of sewage sludge due to lack of adequately developed infrastructure for sludge stabilization. Paper shows an analysis of using a technological reserve of anaerobic digestion reactors at large WWTP (1 million P.E.) for sludge stabilization collected from smaller WWTP in a co-digestion process. Over 30 small WWTPs from the same region as the large WWTP were considered in this study. Furthermore, performed analysis included also evaluation of potential sludge disintegration pre-treatment for co-digestion efficiency improvement.
Highlights
Dynamic development of renewable energy is one of the priority of energy Policy In Poland
A specific case of co-digestion is situation when basis and additional materials are both sewage sludge, for example basis material form large WWTP and additional material are form transported from medium and small WWTPs located near a large plant
Paper presents potential development proposals for use available anaerobic digestion reactors volume for co-digestion process with sewage sludge form small and medium WWTP, localized nearby a large object. This scenario helps to solve the problem of sewage sludge produced in small and medium WWTP and allows to increase renewable energy production on large WWTP
Summary
Dynamic development of renewable energy is one of the priority of energy Policy In Poland. Anaerobic digestion is one of the most popular methods for renewable energy production In this process, because of proper conditions and special equipment, activity of naturally occurring bacteria leading to organic carbon mineralization is multiplied. Paper presents potential development proposals for use available anaerobic digestion reactors volume for co-digestion process with sewage (excess) sludge form small and medium WWTP, localized nearby a large object. This scenario helps to solve the problem of sewage sludge produced in small and medium WWTP and allows to increase renewable energy production on large WWTP (in sections called as “Central Plant”). As a step of performed analysis, potential impact of thermal disintegration of excess sludge before an anaerobic digestion process was investigated
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