Bacterium-alga coupled sewage treatment device based on energy recycling and application method thereof

Abstract

The invention relates to a bacterium-alga coupled sewage treatment device based on energy recycling and an application method thereof. The bacterium-alga coupled sewage treatment device comprises a pretreatment device, a photobioreactor, alga separation equipment, a continuous flow bioreactor and a secondary sedimentation tank which are connected in sequence, wherein the pretreatment device is connected with a municipal sewage inlet pipe; the photobioreactor is connected with a carbon dioxide gas filling device through a gas filling pipeline; a part of a sludge concentration tank is connectedwith the secondary sedimentation tank, and the other part of the sludge concentration tank is connected with residual sludge of the pretreatment device; carbon dioxide generated after sludge in the sludge concentration tank is subjected to pyrohydrolysis and anaerobic acidification treatment is connected to the photobioreactor through a gas inlet pipeline; and the alga separation equipment is connected with a filter press. The device has the advantages of reasonable structural design, reliable and stable operation, low operation and maintenance cost, high automation and intelligence degree, capability of meeting the use and transformation requirements of vast sewage treatment plants, and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment device coupled with bacteria and algae based on energy recycling and a use method thereof. Background technique [0002] At present, the effluent from the secondary settling tank of domestic and agricultural sewage treatment plants contains high concentrations of inorganic nitrogen and phosphorus. If it is discharged without advanced treatment, it will cause eutrophication of downstream water bodies and damage to ecosystems. When nutrient elements exceed the self-purification capacity of the receiving water body, there will be negative effects: algal blooms, lower dissolved oxygen concentrations, fish kills, pH changes and algal toxin production, etc. [0003] At present, the secondary treatment and tertiary treatment of activated sludge method adopted by most sewage treatment plants add a large amount of carbon source chemicals and phosphorus removal ...

AI Technical Summary

Problems solved by technology

[0003] At present, the activated sludge secondary treatment and tertiary treatment adopted by most sewage treatment plants add a large amount of carbon source chemicals and phosphorus removal chemicals in the process of denitrification and phosphorus removal, which brings high cost of chemical agents

At the same time, the nitrogen and phosphorus resources are converted into nitrogen during the treatment process, and the excess phosphorus-containing sludge is discharged out of the water without recycling.

Moreover, the treatment of excess sludge brings high treatment costs, and the sludge treatment cost accounts for as high as 30-60% of the operating costs of reclaimed water plants

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