Optimization of the process of anaerobic-aerobic purification of waste waters of food production using the spatial separation of stages

Rustem Khabibullin,Rahat Bhat,Andrey Petrov,Olga Ivanchenko,A Borodinecs,N Vatin,V Sergeev

doi:10.1051/matecconf/201824518003

Rustem Khabibullin, Rahat Bhat + Show 5 more

Open Access

https://doi.org/10.1051/matecconf/201824518003

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Abstract

The advanced energyand resource saving technologies for purification of industrial waste waters from the food production include both anaerobic biotechnologies, and the combined ones, which include anaerobic and aerobic purification steps. They possess such advantages as economic efficiency, high purification efficiency, minimal formation of excess sludge and ability to obtain alternative energy carrier - biogas. The aim of this investigation was to perform optimization of the process of anaerobic-aerobic biological purification of wastewaters from the milk treatment enterprise. During our investigation we have studied relations between the efficiency of the process of anaerobic-aerobic biological purification of wastewaters of the milk treatment enterprise and specific organic load. We investigated influence of the spatial separation of the anaerobic step of purification with directed succession of the microbial community, which performs the sequence of destruction of the organic compound on the process efficiency. It was shown, that the preliminary anaerobic purification of wastewaters from the milk treatment enterprise allows one to significantly reduce organic load at the aerobic stage of the purification facilities and remove up to 85% of the organic compound. With increase of the specific organic load from 1.4 up to 2.8 kg COD·m -3·days-1 we see a drastic improvement of the efficiency characteristics both for anaerobic and aerobic stages. The redox-potential of the fermentation medium depends on the metabolitic activity of the microbial community and might be used as an efficiency characteristics for destruction of the organic compound at the anaerobic stage, and as an indicator for the oxygen saturation of the medium at the aerobic stage of purification.

Highlights

Nowadays in order to improve efficiency of the anaerobic processes of the liquid waste processing and wastewater purification one uses various methods for intensification and optimization of the processes.The method for the microbial community formation is based on complex and multi-stage character of the microbial biodestruction processes of the complex organic substrates
Separation of the anaerobic process phases is used for intensification of the methanogenic fermentation in a continuous mode during the effluents treatment even for rather simple contaminations
That specific flow rate D of the wastewater being purified and total concentration of the organic compounds S are the key parameters, which denote the microbial methabolism in continuous cultivation conditions

Summary

Introduction

Nowadays in order to improve efficiency of the anaerobic processes of the liquid waste processing and wastewater purification one uses various methods for intensification and optimization of the processes. Separation of the anaerobic process phases is used for intensification of the methanogenic fermentation in a continuous mode during the effluents treatment even for rather simple contaminations (carbons etc.). They appear to be more useful at purification of wastewaters with more complicated contaminations, including proteins, amino acids, fats [2]. To assess the efficiency of the microbial community, which provides anaerobic destruction of the organic compound at spatial separation of the anaerobic stage It is known, that specific flow rate D of the wastewater being purified and total concentration of the organic compounds S are the key parameters, which denote the microbial methabolism in continuous cultivation conditions.

Short description of the mode

Findings

Purification mode