Aerobic particle sludge method for treating town sewage and aerobic particle sludge thereof

Abstract

The invention provides an aerobic granular sludge method for treating city sewage and the aerobic granular sludge, characterized in that a reactor adopts 8-15 ratio of height-to-diameter and 50-80 percent of drainage rate; air is compressed and filled into the bottom of the reactor; after flocculent sludge is inoculated, the drainage rate increases from 40 percent to 60 percent to 80 percent with the increase of 5 percent to10 percent per month; the operation cycle time shortens from 4-6 hours to 2-3 hours with the shortness of 1 hour per mouth; the sedimentation time decreases from 30-40 minutes to 15-20 minutes with the decrease of 1-2 minutes per week; the stable operation is carried out until the aerobic granular sludge takes 50-85 percent of reaction region volume of the reactor; the obtained aerobic granular sludge has large-sized particle, rapid sedimentation speed, compact structure and strong resistance to the environmental change. The invention overcomes the defects of expanded sludge, floated sludge, giant structure of an aeration tank as well as large occupied area, high investment and operation cost and unstable system operation in the prior art.

Description

Technical field:

[0001] The invention belongs to the technical field of wastewater biological treatment, in particular to an aerobic granular sludge method for treating urban sewage and the aerobic granular sludge. Background technique:

[0002] The U.S. "Biological Wastewater Treatment" (Biological Wastewater Treatment, 1999, 2nd edition, 246-313 pages) mentioned that the activated sludge method was developed by Arden and Lockett in Manchester ( Massachusetts ) The development of sewage treatment plants is the most widely used treatment technology for urban sewage treatment. The activated sludge method uses the metabolic activity of activated sludge to treat wastewater in an aerobic state; activated sludge is a microbial group formed by aerobic microorganisms after a large number of reproductions, as well as some inorganic substances, undecomposed organic substances and Composed of the secretions of microorganisms' own metabolism, air or oxygen enters the mixed liquid in a...

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