TECHNOLOGIES OF SEWAGE SLUDGE RECYCLING OF TREATMENT PLANT

Keywords: biogas, sewage water, sludge, anaerobic digestion, gasification

Abstract

 The sewage treatment facilities in Lviv are built according to technological schemes that do not involve the use of sewage sludge. An analysis of the use and disposal of sewage sludge indicates that only a small part of them is used as a fertilizer or burned. The vast majority of sediments are stored on the sludge sites which affects the environment negatively.

The purpose of the work is an experimental study of the possibility of sewage sludge recycling of Lviv sewage treatment plants by technologies of anaerobic fermentation and gasification.

As a result of experiments on anaerobic fermentation of fresh sewage sludge, it has been found that they have a sufficient biogas potential. In particular, in a biogas reactor at a mesophilic regime, the degree of destruction of organic matter of sediments is in the range from 71 to 79.8% during the processing of 25 days. The specific output of biogas is 0.3 m3/m3∙day with a volumetric concentration of methane in biogas of 62.5 to 67.1%.

The energy-efficient technology for the disposal of sediment from sludge sites was developed. It consists of two stages, namely the production of fuel pellets from the sludge and the thermochemical processing of granules by the method of partial gasification. According to the developed technology, fresh sludge was processed from Lviv sewage treatment plants. As a result of partial gasification, the flammable gas, coke residue, and condensate were obtained. The output of combustible comprised 1.24 m3/kg. The heat of combustion of combustible gas came to 6.93 MJ/m3. The yield of the coke oven residue accounted for 35% of the dry weight of the granules. The condensate contains dissolved organic compounds, with CHC constituting
110.4 g O2/dm3.

During the processing, the volume of sludge is from 6 to 8 times decrease. Ash can be used for the production of building materials. The condensate can be disposed of in an anaerobic reactor.

Author Biography

V. Klius

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Institute of Renewable Energy of NAS of Ukraine, head of bioenergy department, senior researcher. Ph.D. since the 1980 year.

Research area: bioenergy, gasification of biomass, organic waste utilization.

Publications: 65 scientific publications, including 18 patents.

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Published
2018-04-30
How to Cite
Klius, V. (2018). TECHNOLOGIES OF SEWAGE SLUDGE RECYCLING OF TREATMENT PLANT. Vidnovluvana Energetika, (1 (52), 78-84. Retrieved from https://ve.org.ua/index.php/journal/article/view/13