Choosing chemicals for wastewater sludge dewatering at small-scale wastewater treatment facilities

Summary

The results of studying the effect of introducing cationic Ultraflok K370 and Ultraflok K390 flocculants with different doses and concentrations of the chemical solution on the efficiency of dewatering aerobically stabilized excess activated sludge in a dehydrator at the wastewater treatment facilities of a cottage village in the Novosibirsk Region are presented. It has been established that Ultraflok K390 flocculant with a 0.1% solution concentration and a flocculant dose of 3.8–4.4 kg/t of dry matter is the optimal chemical for sludge dewatering in a screw dehydrator providing for reducing the sludge moisture content to 81.4–81.7%. Increasing or decreasing the dose and concentration of flocculant solutions results in an increase in moisture content up to 82.1–92.8%. The use of Ultrafloc K370 flocculant provides for achieving 83–84% sludge moisture content at 0.2% solution concentration and chemical dose of 3–3.4 kg/t of dry matter.

Key words

domestic wastewater , flocculant , filter cake , sludge dewatering , dehydrator , sludge treatment

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UDC 628.32.004.69

Bagaev Iurii, Veshkurtsev V. M., Gundyreva Tat’iana, Khutornyuk G. N.

Modernization of Sewerage Treatment Facilities

Summary

The basic technical decisions and a description of the new equipment introduced at sewerage treatment facilities of the city of Novosibirsk are presented. It is told about the methods used when repairing pipelines and capacitive facilities. Modernization is carried out at all stages of treatment: at the main pumping station, mechanical and biological treatment facilities, sludge treatment facilities. Measures carried out make it possible to improve the quality of wastewater treatment, to reduce the discharge of polluting substances into the Ob. Modernization of the operating treatment facilities owing to the use of up-to-date equipment made it possible to improve the reliability of operation of the complex as a whole, to reduce the volume of sludge intended to further utilization, to reduce the negative influence on the environment and improve the city ecology.

Key words

sedimentation tank , modernization , intensification , centrifuge , filter-press , sewerage treatment facilities , grate , grit chamber , methane tank , sludge dewatering , thickener

DOI 10.35776/VST.2021.05.05
UDC 622.794.25

Kotrelev V. M., Polosina Tat’iana, Novikov Gleb, Papush Pavel

Alfa Laval’s latest developments in sludge dewatering with decanter centrifuges

Summary

The innovative technologic solutions developed by Alfa Laval Company and implemented in Aldec G3 decanter centrifuge are considered. Alfa Laval Company produces two types of advanced decanter centrifuges for wastewater sludge dewatering (altogether there are more than 12 types of centrifuges for use in various fields: from the food industry and biopharmaceuticals to dewatering oil sludge or tailings of the mining industry). The use of Aldec G3 decanter centrifuge provides for the maximum reduction in the total cost of wastewater sludge dewatering. Described are the types of repair work for decanter centrifuges carried out in Alfa Laval, the only ISO-certified service center in Russia.

Key words

power saving , wastewater treatment , decanter , sludge dewatering , decanter centrifuge , equipment upgrade

DOI 10.35776/VST.2021.08.02
UDC 628.32

Getmanskii Artem, Shcherbakova Julia, Kukoba Konstantin

Equipment manufactured by ECOS Group within the frames of the Import Substitution Program: relevance and efficiency

Summary

Changes in the financial and economic situation in the country and in the world are pushing companies to develop new and optimize existing technologies. For 15 years, ECOS Group has been manufacturing original block-modular plants with a capacity of up to 1200 m3/day. A new product line of block-modular and container plants with increased productivity up to 7500 m3/day, as well as a product line of own-produced branded electromechanical equipment have been developed. The special design of wastewater treatment plants has a wide range of advantages: high reliability and energy efficiency, stability in operation, seismic resistance and, at the same time, modular flexibility. The assured effective treatment is achieved by means of full equipping and testing of the plant at the manufacturing works. In the process of manufacturing, the Import Substitution Program has been actively used resulting in developing economically competitive, efficiently operating and proven process solutions.

Key words

wastewater treatment , sludge dewatering , dehydrator , screw mechanized screen , sludge drying , block-modular plant , sludge disinfection , drum screen , combined screen , tangential grit chamber , flocculant preparation plant