Tag:secondary settling tank

№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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№10-2|2010

WASTEWATER TREATMENT

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UDC 628.356.57.001.5

SHVETSOV V. N., MOROZOVA K. M., Smirnova I. I., Semenov M. Yu., Lezhnev M. L., Ryzhakov G. G., Gubaydullin T. M.

The Use of Bioblocks at Wastewater Treatment Facilities

Summary

Results of the laboratory study of an aeration tank operation for the purpose of technological comparison of two new modified bioblocks, BBZ-45P-14 and BBZ-65P-10, having the similar surface structure but different geometric parameters are presented. It is shown that these bioblocks can be used successfully in aeration tanks for immobilization of microorganisms of activated sludge. The tests of loading material samples have been carried out at biomass density in bioblocks of 0,3–0,36 kg/kg, at equivalent concentration of sludge in the system – 2,3 g/l. The bioblock BBZ-65P-10 is used preferably in aeration tanks, BBZ-45P-14 – in aeration tanks with low load on activated sludge, blocks of aftertreatment for additional clarification of water treated biologically and in biofilters for build-up of biological film. The comparison of results of tests on rate of activated sludge adhesion obtained with new types of bioblocks and BBZ-65 tested earlier makes it possible to conclude that the adhesion process goes off more intensively on rougher surfaces of modified models of bioblocks.

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№10|2016

WASTEWATER TREATMENT

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UDC 628.33

Kevbrina M. V., Bogomolov M. V., Streltsov S. A., Belov N. A., Kolbasov G. A.

Optimization of the mode of sludge removal from secondary settling tanks

Summary

In the process of upgrading the Moscow Novokur’ianovskie wastewater treatment facilities the scraper mechanism for activated sludge collection in 54 m diameter secondary settling tanks was replaced by SO-54 sludge sucker. Since it was the first experience of using sludge suckers at the Kur’ianovskie wastewater treatment facilities it was decided to carry out experimental tests of the operation of the secondary settling tanks equipped with sludge suckers as well as to develop and approbate the method of efficient activated sludge collection and removal from the bottom of the settling tanks. The operation of SO-54 sludge sucker in different modes was analyzed. It was shown that the design of the settling tank provided for the operation control by switching off and on the suction pipes of the upper level of the sludge suckers, i. e. eliminating the use of complicated instruments. Regulating the operation of the suction pipes of the upper level of the sludge suckers with a time switch provides for maintaining the optimal height of the activated sludge layer. Switching off the suction pipes of the upper level of the sludge suckers results in the increased concentration of recycle sludge. As a result of changing SO-54 sludge pump operation the dosage of recycle sludge was increased from 4.6 to 7.1 g/l eliminating the effluent quality in relation to suspended solids. This allowed reducing the recycle sludge volume subject to pumping to the aeration tanks, and reducing the number of operating pumps, and power saving.

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Российская ассоциация водоснабжения и водоотведения

Конференция итог

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