A carbonyl composite carbon source biological carbon supplement and preparation method thereof

Abstract

The invention relates to the technical field of sewage treatment. The invention particularly discloses a carbonyl composite carbon source biological carbon supplementing agent and a preparation methodthereof. The biological carbon supplementing agent is prepared by taking starch liquefied slurry as a raw material, adding an organic acid, controlling a reasonable pH value, converting starch into acarbonyl intermediate product under the action of a saccharification catalytic enzyme, then adding the organic acid and alcohol, and controlling the temperature so as to generate a carbonyl compoundbeneficial to the growth of microorganisms. The product not only ensures the functional requirements of the carbon supplementing agent, but also does not introduce salt and other harmful ions, and meanwhile, the starch is used as a renewable resource, so that the raw materials are rich in source and low in price. The biological carbon supplementing agent provided by the invention can be widely applied to the field of sewage pretreatment, enhances the microbial activity, promotes the microbial denitrification reaction, and particularly has the obvious advantages of small dosage, short microbialadaptation period and easiness in management and use under the condition of lower water temperature in winter.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a biological carbon supplement for promoting biological denitrification. Background technique [0002] As the country attaches great importance to the ecological environment, especially the management of ecological river basins, the quality of water discharged into the water environment is strictly controlled, and the standards are gradually improved. China's current sewage treatment plant (station) discharge standard implements the national standard GB 18918-2002 pollutant discharge standard for urban sewage plants. The maximum allowable value of total nitrogen in the first grade A of this discharge standard is 15mg / L, and ammonia nitrogen is 8mg / L; much higher than In the surface water environment index standard, the water quality of Class V should be lower than 2.0mg / L. A large amount of high-nitrogen wastewater will be discharged into the water body, causing a large ...

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Problems solved by technology

Glucose is generally used as an ideal carbon replenishing agent, which is easy for microorganisms to absorb, but the control of the dosing position and dosage is relatively strict. If the control is not done properly, it will easily cause filamentous bacteria to multiply, cause sludge swelling, and degrade the quality of the effluent from the sedimentation tank; Organic acid salt carbon supplements can be roughly divided into low-molecular straight-chain organic acid salts and aromatic benzene-ring organic acid salts. Low-molecular-weight direct-chain organic acid salts are conducive to microbial absorption, while aromatic benzene-ring organic acid salts are hardly directly absorbed by microorganisms. use, and organic acid salt carbon supplements are likely to cause changes in pH and salinity, and the dosage will be greatly limited; alcohol carbon supplements are generally ethanol or methanol, which are dangerous chemicals and have special effects during use and management. Great limitations; although the by-products of chemical production enterprises are cheap, their components are complex and unstable. Harmful and toxic substances are likely to cause fatal harm to the sewage treatment system and cause the entire biological system to collapse.