Compound enzyme preparation for reducing urban sludge

Abstract

The invention discloses a compound enzyme preparation for reducing urban sludge, which contains 50% to 60% of bromelain, 5% to 10% of lysozyme and the balance of yeast leavening. The compound enzyme preparation provided by the invention can significantly reduce the yield of sludge, and facilitate the improvement of effluent quality indices and water quality after being added in an activated sludge pond.

Description

technical field [0001] The invention relates to an enzyme preparation, in particular to a compound enzyme preparation for urban sludge reduction. Background technique [0002] With the progress of urbanization and the improvement of environmental quality standards, the sewage treatment rate and degree of sewage treatment are also increasing and deepening, and the output of sludge is also greatly increased. In 2003, the annual sludge (dry weight) in the country Yields approximately 130 x 10 4 t, and is increasing at a rate of more than 10% per year. If all the urban sewage is treated, the sludge (dry weight) will be about 840×10 4 t. During the biological treatment of sewage, a large amount of biological sludge is produced, which needs to be separated, stabilized, digested, dehydrated and disposed of. This requires a lot of infrastructure investment and high operating costs; from treatment to final disposal, the operating cost of sludge is about 40% (drying) to 65% (incin...

AI Technical Summary

Problems solved by technology

However, the BOD value of sludge is generally very high. In this case, the dissolved oxygen in the sludge is far from meeting the needs of microorganisms for aerobic respiration, and microorganisms generally cannot fully perform aerobic digestion.

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