bbk 000000
UDC 628.35
Mishukov B. G., Murashev S. V.
Calculation of low-capacity plants with membrane filtration for biological wastewater treatment
Summary
The calculation of standard series of plants for biological treatment of wastewater is set. The plants include a fermentation settling tank and a membrane bioreactor. The method has been approbated for calculating the plants with a capacity less than 500 m3/day. It was determined that increasing the activated sludge dosage from 3 to 5 g/l provided for 1.5 reduction of the size of the treatment facilities; at that increasing the activated sludge dosage more than 3-fold (more than 8 g/l was inexpedient. The size of the plants for 3 and 5 g/l activated sludge dosages with account of 25% volume increase (with correction for reliability) is given. The use of the suggested process flow scheme provides for increasing the efficiency of wastewater treatment. The effluent quality parameters approach the maximum permissible sanitary-hygienic regulations for the discharge into fishery water bodies. At that the use of chemicals for nutrients removal is not foreseen. The use of membrane filtration provides for equalizing and enhancing biological processes by means of possible increase of activated sludge concentration, and also for reducing the size of the plant, increasing the efficiency of wastewater treatment by means of enhanced removal of suspended solids.
Key words
wastewater , biological treatment , nitrification , denitrification , membrane filtration , dephosphorization
|
bbk 000000
UDC 628.336.71
Rublevskaya O. N., Probirsky M. D.
Reconstruction of the sludge incineration plant at the Central wastewater treatment facilities in St. Petersburg
Summary
The need for the reconstruction of the wastewater sludge incineration plant at the Central wastewater treatment facilities of St. Petersburg is substantiated. A short description of the technological processes of sludge incineration, flue gas purification and treatment of wash water generated in the process of gas purification is given. The advanced technologies of sludge pretreatment before incineration, flue gas purification, heat utilization, electric energy generation are presented. The results of the biochemical, toxicity, chemical and radiological studies carried out in SUE «Vodokanal of St. Petersburg» showed the possibility of using wastewater sludge incineration ash in the production of constructional materials. Cementing properties of ash that improve the structure and quality of constructional materials were determined. The use of ash in the production of concrete and bitumen concrete in amount of 10–12% of the concrete weight is also promising. The use of ash will improve the concrete strength by increasing the imporosity of the poured concrete, bitumen concrete. Solving the task of ash beneficial use will become a concluding stage in the package of measures on wastewater sludge utilization and will provide for zero waste process of wastewater treatment.
Key words
sludge , wash water , scrubber , sludge drying , incinerator , flue gases , ash , dry matter
|
bbk 000000
UDC 628.212.2/.3
Vatin N. I., Grekov Mikhail, Leonov L. V., Probirsky M. D., Rublevskaya O. N., Chechevichkin A. V., Iakunin L. A.
Results of the test operation of FOPS® filter for treatment of stormwater runoff from residential areas in St. Petersburg
Summary
In the process of designing facilities for the treatment of surface runoff from residential areas certain difficulties arise with determining the composition and actual concentrations of pollutants required for the calculations. The task of the work was testing the operation on-site of a filter cartridge for the purification of polluted surface runoff flowing into the storm sewer from the residential area during the spring-summer period. The results of the study of the composition of surface runoff from the residential area and possible treatment with the use of a filter cartridge (FOPS®-MU) are presented. It is shown that highways contribute much to the pollution of the surface runoff from the residential areas. The main pollutants are suspended solids, oil products, iron and manganese. It is stated that the use of FOPS® - MU filter provides for the high efficiency of the surface runoff treatment during the entire period (April – September) without any losses of the nominal capacity.
Key words
surface runoff , efficiency of treatment , residential area , sewer manhole , filter cartridge
|
bbk 000000
UDC 628.23
Vasilyev V. M., Malkov A. V., Klementyev M. N.
Places of corrosive gas generation in the sewerage network
Summary
The factors that affect the generation of corrosive gases in the wastewater disposal system, saturation of the gas air environment with corrosive gases in sewers are considered. A number of structural components as well as hydraulic patterns of wastewater flow, its physical properties that enhance the gas generation processes are considered and described. The evaluation and prediction of the places of corrosive gas generation and emission provide for forecasting the measures focused on the reduction of the negative impact of emissions or their complete elimination. The operating services carry out regular sewer network monitoring with the purpose of detecting the places of emission generation. The future work of the services is limited to the isolation of corrosive gases by redistribution in the network, disposal into the atmosphere, neutralization or purification. The results of introducing the design of a pipe drop with a dead blanking in the lower part of the sewer shaft, ejector and pipe air vent are presented.
Key words
sewer , sewerage network , shaft , gas emission , corrosive gases , gas generation
|
|
