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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

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REFERENCES

1. Murashev S. V., Solov’eva E. V., Shilova N. K. [The experience of wastewater treatment technology approbation on the basis of a membrane bioreactor at the low-capacity treatment facilities]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2016, no. 2, pp. 52–57. (In Russian).
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