DOI 10.35776/MNP.2019.11.05
UDC 628.385

Litty Yu. V., Kovalev Dmitrii, Kovalev Andrei, Katraeva I. V., Mikheeva El’za, Nozhevnikova A. N.

Use of a vortex layer apparatus for improving the efficiency of methane digestion of wastewater sludge

Summary

Improving the efficiency of anaerobic digestion of wastewater sludge including methane yield and the depth of mineralization of organic matter increasing is an urgent task. As part of the study the effect of wastewater sludge pre-treatment in an apparatus with vortex layer of ferromagnetic particles on the efficiency and kinetic parameters of the subsequent anaerobic digestion of the sludge under thermophilic conditions was investigated. The analysis of the particle size distribution of wastewater sludge before and after treatment in the vortex layer apparatus was carried out. The technological parameters of sludge processing in the vortex layer apparatus provided for increasing methane yield by 3%, degree of decomposition of organic matter by 8–9%, and hydrolysis constants by 4.7%. To estimate the kinetic parameters of the process the modified Gompertz equation and the first-order equation were used.

Key words

wastewater sludges , grain­size composition , apparatus with vortex layer of ferromagnetic particles , methanogenic digestion , kinetic parameters , modified Gompertz equation , first-order equation

bbk 000000

UDC 628.16.067.3

Filatov A. I.

Method of maintaining the steady grain-size composition of rapid filter media

Summary

During the operation of rapid filters the grains of the filter media inevitably wear off and disintegrate which affects adversely the output of the filtration plants. To restore the design grain-size composition of the filter media the upper reduced in size layer is usually removed. This process is fairly labor-intensive and economically unjustified. The consistency of the grain-size composition of rapid filter media can be maintained eliminating labor-intensive processes of manual removal of fine grains and media unloading and rescreening. A method of maintaining the steady grain-size composition directly in the filter by intermittent washing with preestimated stabilization rate is suggested. The formulae for calculating the rate and process stages of stabilization wash are presented.

Key words

rapid filter , filter bed , filtration plant , grain­size composition , intermittent wash , filter media fineness stabilization