Inverted denitrification process film bioreactor

Abstract

The invention provides a novel inverted denitrogenation membrane bioreactor, which belongs to the water treatment equipment technical field. The invention is characterized in that the inverted denitrogenation membrane bioreactor consists of non-woven fabric padding, reaction vessels, an aeration device, a temperature control device and a membrane component. An anaerobic ammonium oxidation reaction vessel is a closed device with anaerobic ammonium oxidation bacterium adopting non-woven fabric for attachment growth; a nitrosification reaction vessel is an open device with effluent adopting membrane effluent. Non-woven fabric which has a larger extent of porosity (the aperture is 3 micrometres) and a roughened surface is suitable for the attachment of the anaerobic ammonium oxidation bacterium which grow slowly, and has low cost and light weight; and the membrane component adopts a hollow fibrous membrane (the material is polypropylene, the average aperture is 0.1 micrometre, and the membrane area is 0.2 m<2>). The inverted denitrogenation membrane bioreactor has the advantages that: the attachment of microorganism is excellent, and stromata and gas-liquid-solid three-phase are mixed evenly, thereby easily achieving the required operating parameter, and saving cost and operating expense. The reactor is applicable to a process which performs anaerobic ammonium oxidation and nitrosification in succession, and is a novel biological denitrogenation reactor with wide market application prospect.

Description

technical field [0001] The invention belongs to the technical field of water treatment equipment and relates to an inverted membrane bioreactor for denitrification process. Background technique [0002] With the increasingly stringent discharge standards, the removal of ammonia nitrogen in wastewater has attracted increasing attention. Aiming at the shortcomings of the traditional biological denitrification process of first nitrification and then denitrification, such as high energy consumption and high operating costs, in the past ten years, domestic and foreign scholars have developed a number of biological denitrification processes, such as SHARON-ANAMMOX ( S inglereactor H high activity A mmonia R emoval O ver N itrite, AN aerobic AMM onia OX idation) combined process, nitrosation-ANAMMOX combined process, CANON ( C completely A autotrophic N itrogen removal O ver N itrite) process and OLAND ( O xygen L limited A autotrophic N itrification and D enitr...

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Problems solved by technology

However, these biological denitrification processes also have some problems: the growth rate of the bacteria in the reactor is slow, the carbon source and dissolved oxygen in the water will inhibit the bacteria, the process conditions are relatively harsh, and the operation is complicated, etc.

However, this combined process also has disadvantages: the denitrification efficiency of the whole process depends on the matrix ratio of ammonia nitrogen and nitrite nitrogen in the effluent in the nitrification stage, and the degree of nitrification restricts the operation of the combined process; The produced nitrate nitrogen will inhibit the anaerobic ammonium oxidation bacteria (ANAMMOX bacteria); too high or too low COD concentration may have adverse effects on the process operation

At present, the reactors operating the nitrosation-anammox process at home and abroad mainly include: fixed bed reactors, fluidized bed reactors, sequencing batch reactors, and air stripping reactors, etc., but these reactors are in operation. There are some problems: such as uneven film formation when the fluidized bed reactor is running, the oxygen transfer rate of the fixed bed reactor and the sequencing batch reactor is poor, and the nitrogen generated by the air lift reactor makes the sludge particles float up and block the outlet pipe Wait

Trace amounts of oxygen have a reversible inhibitory effect on ANAMMOX bacteria. The first step in the operation of the anaerobic ammonium oxidation process - the pure cultivation of ANAMMOX bacteria requires a strict anaerobic environment. The ordinary reactor is not a closed device and cannot Perform anaerobic culture and anaerobic reaction

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