Tag:prefermentation

№6|2022

WASTEWATER TREATMENT

DOI 10.35776/VST.2022.06.03
UDC 628.35:665.666.6

Kevbrina M. V., Gavrilov Dmitrii, Belov N. A., Agarev Anton

Analysis of the operation of acidifiers after the reconstruction of the block of the Liuberetskie Wastewater Treatment Facilities

Summary

Municipal wastewater in Moscow after primary settling contains insufficient organic matter for the sustainable removal of nitrogen and phosphorus to the standard quality during treatment. Therefore, while designing the reconstruction of the old block of the Liuberetskie Wastewater Treatment Facilities in Moscow, the acidification (prefermentation) method was chosen as the most efficient process solution for enriching wastewater with easily decomposable organic matter (obtaining organic acids during acidic fermentation of raw sludge from primary settling tanks). Upon the completion of the reconstruction of the old LWWTF block at the end of 2021, primary sludge acidifiers were put into operation. Launching acidifiers provided for enriching primary water with easily decomposable organic matter (volatile fatty acids, including acetate) resulting in the improved efficiency of denitrification and biological dephosphorization processes in the aeration tanks. Two or three weeks after the acidifiers had been put into the operation mode, the quality of effluent for nitrogen as nitrates and phosphorus as phosphates was meeting the MPC for fisheries. The process parameters of the acidifiers (hydraulic retention time, residence time for dry matter, the rate of volatile fatty acids formation, the degree of recirculation, the dry matter concentration in the incoming flow) corresponded to those recommended in the literature. Possible situations of abnormal operation of acidifiers have been analyzed and recommendations have been developed to eliminate the causes.

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№10|2012

WASTEWATER SLUDGE TREATMENT

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UDC 628.35:661.63

Belov N. A., Kevbrina M. V., Aseyeva V. G., Gavrilin A. M., Gazizova N. G.

Acidification potential of the incoming wastewater and raw sludge at the Moscow wastewater treatment facilities

Summary

The consistency of biological phosphorus elimination process depends on the readily available organic matter concentration in the incoming wastewater. The concentration of this substance in the wastewater at the Moscow wastewater treatment facilities is not high. Acidification is one of the methods of enhancing readily available organic matter concentration. The production of biologically readily available organic matter (volatile fatty acids) of raw sludge and incoming wastewater at the Kouryanovo Wastewater Treatment Facilities was evaluated in an anaerobic batch-flow reactor at various temperature and time values of prefermentation process. On the basis of the experimental results the techniques of evaluating the availability of the organic compounds for phosphate accumulating bacteria (the technique of evaluating acidification potential) was developed. Acidification potential provides for the assessment of acidification process efficiency for the reduction of phosphate-phosphorus in the effluent.

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№5|2013

WATER AND WASTEWATER COMPANIES (VODOKANALS) IN RUSSIA

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UDC 628.35:661.63

KOZLOV M. N., Streltsov S. A., Kevbrina M. V., Gavrilin A. M., Gazizova N. G.

Acidification (prefermentation) as a method of raw sludge stabilization in the process of nutrients removal from wastewater

Summary

The concentration of readily available organic matter determines the stability of biological elimination of phosphate phosphorus from wastewater. Wastewater in Moscow is characterized with low value of this index. The process of raw sludge acidification (prefermentation) is one of the methods of increasing the concentration of readily available organics. The results of laboratory, pilot and industrial-scale testing raw sludge acidification at the Moscow wastewater treatment facilities are presented. Acidification process provides for increasing the concentration of volatile fatty acids in wastewater that improves the stability of phosphate phosphorus elimination in the aeration tanks operating with the technology developed at the University of Cape Town.

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№5|2014

WASTEWATER TREATMENT

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UDC 628.35:661.5

Kevbrina M. V., Gavrilin A. M., Kozlov I. M.

The new form of pre-fermentation process arrangement for removing nutrients from wastewater

Summary

The concentration of readily available organic matter determines the process stability of biological phosphorus removal from wastewater. The low value of this parameter is typical for municipal wastewater in Moscow. Raw wastewater sludge pre-fermentation (acidofication) is one of the methods of increasing the readily available organic matter fraction. A new arrangement of pre-fermentation process has been implemented in the industrial-scale aeration tanks of the Moscow wastewater treatment facilities operating after the process flow scheme of the University of Cape Town (UCT). Compared to the traditional pre-fermentation process flow scheme taking place in a primary settling tank or reactor prefermenter the process is arranged in the first anaerobic zone of the aeration tank. Here, in the absence of mixed liquor mixing, a thickened layer of activated sludge is formed accompanied by pre-fermentation of organic matter sorbed onto sludge. Meanwhile the anaerobic zone carries on its main function in the treatment process related to biological phosphorus release by means of phosphate accumulating bacteria consuming volatile fatty acids. Increasing the concentration of volatile fatty acids in mixed liquor in anaerobic zone by means of pre-fermentation stabilizes phosphate removal from processed wastewater. Arranging pre-fermentation process in the first corridor of the aeration tank is more advanced and cost-effective compared to the traditional process arrangement in settlers-prefermenters owing to saving expenditures on mixing and eliminating construction or upgrade of additional tanks (prefermenters, settling tanks).

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Баннер конференции для ВСТ 3

Wasma23 200x100 stand

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Российская ассоциация водоснабжения и водоотведения

souz ingenerov 02