DOI 10.35776/MNP.2020.01.03
UDC 628.355
Zalyotova N. A., Zalyotov S. V.
The study of the response of dehydrogenase activity
of sludge to a change in the process parameters of an aeration tank
Summary
The biological method of wastewater treatment is a comprehensive multicomponent process; the activities of the enzyme system being the key component of it. It is known that dehydrogenases have been one of the most important enzymes the ensure the biological process. The complicated mechanism of the action of enzymes has not been fully described so far; however, in the practice of monitoring biological treatment processes, an indicator of the dehydrogenase activity of sludge is used. The research results provided for supplementing the available information with actual data on the interdependence of the level of dehydrogenase activity of sludge and indicators of individual process parameters of biological treatment. It was shown that the mode of operation of aeration tanks (organic matter load on sludge, dose of activated sludge, etc.) and the values of the initial dehydrogenase activity and dehydrogenase activity of the same sludge sample with weakly concentrated solution (DASН2О) are interconnected and depend on the organic load on sludge. The results of the study can be used to control the biological process of wastewater treatment.
Key words
wastewater , biological treatment , aeration tank , activated sludge , active sludge dosage , dehydrogenase activity , organic matter load on sludge
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UDC 628.35:661.63
Rouzhitskaya O. A., Gogina Elena, Salomeyev V. P.
Using reinforced medium for the enhancement of phosphate and organics removal from wastewater
Summary
The results of investigating advanced phosphate removal from domestic wastewater are presented. The method of advanced wastewater treatment with the use of reinforced medium is suggested. The highest phosphate removal efficiency is achieved with the help of the technology without activated sludge recycling. The enhancing effect of reinforced medium on biological removal of organics is shown. The activity coefficients of the biological process with the use of reinforced medium are determined.
Key words
wastewater , bioreactor , sludge index , biogenic elements , active sludge dosage , dissolved iron , reinforced medium
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UDC 628.35
Iavtushenko Marina, Tarasova O. V., Rouzayev V. I., Belyaeva S. D., Bibyaev A. V., Belyaev M. A.
Commissioning the upgraded biological treatment plant at the Podolsk wastewater treatment facilities
Summary
The results of commissioning the upgraded biological treatment plant at the Podolsk wastewater treatment facilities are presented. The start up of the basic equipment, mixers and recycle pumps installed in anaerobic and anoxic zones; the secondary settler equipment; the new Korean NEUROS NХ-300 air blowers was carried out. The tertiary treatment unit washing regime during commissioning was defined. Commissioning of the UV-disinfection plant was carried out. The operational parameters of the treatment facilities were monitored by the automatic analyzers and sensors data; the laboratory control was carried out as well. Exceeding the incoming wastewater flow compared to the design value was noted; exceeding suspended solids and phosphate concentrations in the incoming wastewater was registered. However, despite the excess of the incoming wastewater flow and increased concentration of pollutants, the treatment facilities ensure advanced elimination of organic matter and nutrients.
Key words
disinfection , reconstruction , wastewater , dephosphatization , aftertreatment , biological treatment plant , nitri-denitrification , in-process control , active sludge dosage , dissolved oxygen
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DOI 10.35776/VST.2021.10.03
UDC 628.35:615.076
Dubovik Ol’ga, Markevich R. M., Gavrilovich Ekaterina, Grebenchikova Irina, Ivanovich Vadim
Improving the hydrobiological analysis of activated sludge
at the Minsk wastewater treatment facilities
Summary
Based on the accumulated experience in operating the Minsk Wastewater Treatment Facilities and a review of information sources, a scheme for the hydrobiological analysis of activated sludge was determined, and a form for recording the results of the analysis was provided. For the quantitative account of filamentous microorganisms, an original five-point system was developed. Based on the literature data analysis, favorable conditions for the mass growth of filamentous microorganisms found in activated sludge were determined. Over a long period of time, including different seasons of the year, the improved methodology was tested for monitoring the state of the sludge suspension at two sites of the treatment facilities: traditional four-line continuous-flow aeration tanks at the first site and bioreactors with cascade denitrification at the second site. The species of filamentous microorganisms, permanently living in wastewater treatment structures, have been identified, and the dominant species have been determined. The results of the analysis of filamentous forms and sedimentation characteristics of activated sludge are compared. Conclusions were made about the features of the biocenosis in the aeration tanks at the first site and in the bioreactors at the second site; about the identity of the species composition of the filamentous bacteria communities, the effect of the wastewater composition and treatment conditions (sludge load, occurrence of zones with different levels of aeration) on the properties of the sludge suspension.
Key words
wastewater treatment , sludge index , activated sludge , active sludge dosage , hydrobiological analysis , filamentous form of microorganisms , point-based system
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