Tag:sludge index

№10|2011

WASTEWATER TREATMENT

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UDC 628.355.2

Nikolaev Yu. A., KAZAKOVA E. A., GRACHEV V. A., Kevbrina M. V., Dorofeev A. G., Aseyeva V. G., Akmentina A. V.

Biological treatment of municipal wastewater and return flows with the use of granulated sludge

Summary

The experience of aerobic granulated activated sludge formation in the laboratory batch reactor by sedimentation selection with the use of flocculant is described. The sludge is used in the process of low concentrated municipal wastewater and sludge dewatering filtrate (centrate) treatment. The developed technologies of granulated sludge formation provide for the intensification of the wastewater treatment processes; and hence the reduction of the treatment facilities footprint is ensured alongside with the improvement of their operation, reliability and efficient performance.

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№3|2019

WASTEWATER TREATMENT

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UDC 628.356.5

KOZLOV M. N., Kevbrina M. V., Dorofeev A. G.

Secondary settlers: comparison of the calculation methods in designing and analysis of the parameters of efficient operation of the facilities

Summary

The results of the comparison of methods of calculating secondary settlers through the example of a model wastewater treatment plant (domestic method according to SNiP 2.04.03-85, German method according to Germany Standard ATV-DVWK-A131E, American method based on mass flow theory) are presented. It is shown that the surface area of settlers calculated according to Standard ATV has higher values compared to the calculations according to SNiP 2.04.03-85 and American method. The values of the surface area of settling tanks calculated according to SNiP 2.04.03-85 and American method are very close. At the same time the SNiP method is much simpler and requires much less initial parameters than the American method. For the domestic practice of operating secondary settlers it is proposed to introduce a new parameter – «dry matter loading on the settler surface» taken from the mass flow theory. This indicator indicates how much dry matter of the mixed liquor from aeration tanks enters per unit surface of secondary settlers per hour and corresponds to the incoming mass flow. By varying the dry matter loading on the surface of secondary settlers it is possible to provide for the standard suspended solids concentration in effluent. Through the example of the operating 54 m diameter settlers the dependence of the clarification efficiency on this parameter is shown.

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№6|2013

WASTEWATER TREATMENT

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UDC 628.35:661.63

Rouzhitskaya O. A., Gogina Е. S., 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.

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№10|2010

WASTEWATER TREATMENT

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UDC 628.356

Kharkina O. V., Shotina K. V.

Research in Operation of Nitri-Denitrification Aerotanks with Heightened Doses of Activated Sludge

Summary

Specialists of the MSUE Mosvodokanal have developed the technological method making it possible to develop purposefully activated sludge having a sludge index reduced stably for technology of biogenic elements removal and heightened speed of sedimentation. It makes it possible to increase the oxidation capacity of aerotanks as regard the chemical oxygen consumption and ammonium nitrogen. In the issue of pilot studies carried out the rise of oxidation capacity by 1,6–1,7 times owing to the change of technological conditions of the unit operation has been achieved. The method developed makes it possible to reconstruct aerotanks for biological treatment of wastewater for nitrogen and phosphorus without reduction of hydraulic loading.

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№11|2010

WASTEWATER TREATMENT

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УДК 628.315.1: 628.355: 676.2

Shchetinin A. I., Kostin Yu. V., Andreev E. L., Esin M. A., Malbiev B. Yu., Demyanenko E. V., Yurchenko V. A.

Syktyvkar Timber Processing Complex: Solving of Wastewater Treatment Problems

Summary

Peculiarities of the wastewater treatment process of the Syktyvkar timber processing complex typical for pulp and paper industry are described. Data on studies of the problem of activated sludge swelling are presented. It is proposed to solve this problem using the aerobic selector. On the basis of simulation results the scheme of reconstruction of preaerators of inlet flows into an aeration tank is proposed; according to this scheme the wastewater mix and return activated sludge are supplied to the first tunnels of preaerators operating as a selector of bacteria. The article presents a flow chart of wastewater and sludge treatment for retechnologization of existing facilities consisting of the following stages: treatment of wastewater at fine treatment mechanical grates and aerated sand catchers; degassing of wastewater before primary sedimentation tanks; installation of belt filter presses for treatment of excess activated sludge; installation of equipment for additional dewatering of primary sludge and excess activated sludge up to 50% of moisture content; disinfection of wastewater.

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mvkniipr ru 

Российская ассоциация водоснабжения и водоотведения

WST19 200x300

Конференция итог

VAK2