CN102101722A

CN102101722A - Novel membrane bioreactor for treating pig farm wastewater

Info

Publication number: CN102101722A
Application number: CN 201110052787
Authority: CN
Inventors: 万金保; 余敏
Original assignee: Nanchang University
Current assignee: Nanchang University
Priority date: 2011-03-07
Filing date: 2011-03-07
Publication date: 2011-06-22
Anticipated expiration: 2031-03-07
Also published as: CN102101722B

Abstract

The invention relates to a novel membrane bioreactor for treating pig farm wastewater, which comprises a water distributing tank, a water inlet and outlet pump, a liquid level meter, a flowmeter, a carbon fiber padding, a hollow fiber membrane assembly, an air flowmeter, a PLC (Programmable Logic Controller) system and an aerating head, wherein the carbon fiber padding is fixed in a reactor; the running of the whole reactor is automatically controlled by the PLC system; and when being used for treating pig farm wastewater, the reactor has good decontamination denitrogenating effect and no secondary pollution.

Description

Handle piggery wastewater new membrane bio-reactor

Technical field

The present invention is the treatment facility that relates to the piggery wastewater anaerobic digestion solution.

Background technology

Livestock breeding wastewater, particularly large scale of pig farm waste water have become the many geographic primary pollution sources of China.Present most pig farm adopts solid-liquid separation-anaerobic-aerobic to handle excrement and urine water.Membrane bioreactor (MBR) is as a kind of novel and water technology efficiently, and it has stable effluent quality, surplus sludge volume is few, capacity of resisting impact load is strong, be easy to operation automatically and take up an area of advantages such as few.MBR has obtained certain application as the aerobic treatment reactor of piggery wastewater anaerobic digestion solution in the laboratory, be not very high but the problem that exists is MBR to the clearance of total nitrogen.

Summary of the invention

There is the shortcoming that sludge concentration is low, the total nitrogen removal effect is relatively poor when the objective of the invention is directly to handle the pig farm anaerobic digestion solution, a kind of composite film reactor of handling piggery wastewater is provided at membrane bioreactor.Breeding wastewater is after treatment, and its waste discharge can reach GB18596-2001 " livestock and poultry breeding industry pollutant emission standard ".

The present invention is achieved by the following technical solutions:

The present invention adds carbon fiber bar as carrier filler in the MBR reactor, adopt the carbon fiber bar carrier filler with microbial immobilized cultivation, reaches special process requirements such as denitrogenation, dephosphorization and degradation of organic substances.The intervention of biofilm packing can excite microbic activity, thereby promotes the degraded and the conversion of organic pollutant, nitrogen phosphorus substance etc. in the water.On a section of " microbial film ", by outer and in formed aerobic, amphimicrobian and three kinds of reaction zones of anaerobism.At aerobic zone, aerobic bacteria is converted into nitrate with ammonia nitrogen, and small organic molecule is converted into carbonic acid gas and water (soluble inorganic phosphorus is converted into the intravital ATP of cell), at anaerobic zone, anerobe is converted into nitrogen and oxygen (larger molecular organics that difficulty is decomposed is decomposed into degradable small organic molecule) with nitrate.Final pollution group just is decomposed and changes into the N of effusion water body ₂, CO ₂And H ₂O.Therefore the adding of carbon fiber bar filler more helps the removal of total nitrogen.

This reactor mainly is made up of following component: distribution reservoir, intake pump, under meter, aeration head, carbon fiber bar filler, hollow fiber film assembly, go out water pump, pneumatic pump, self-acting valve, PLC housing.

Described carbon fiber bar filler can be the PAN series fiber of being made by the polyacrylic acid macrofiber, and the 12000 threads set by 7 microns of diameters through the sizing process special processing forms, in case putting into water just can scatter rapidly, adding it all has trickle concaveconvex structure on surface separately, can form huge surface-area.

Each components and parts of this reactor connect like this:

Distribution reservoir (1), intake pump (2), under meter (4) connect successively, link to each other with reactor (5) by water distribution pipe, contact with carbon fiber bar filler (7), aerial fiber film component (8) with go out water pump (10) and be connected, aeration head (6) is arranged on the bottom of reactor, pneumatic pump (14) is connected with air flowmeter (9), and liquidometer (3) places the right top of reactor, and shore pipe (13) is arranged on the bottom of reactor.

Beneficial effect of the present invention is:

(1) the present invention is the improvement of MBR, and the operating process when it handles waste water is continuous water-in and water-out.Microbial film is fixed on filling surface, has formed the stable ecosystem.Can perch the speed of growth is slow, generation time is long bacterium and higher microorganism, as nitrifier, so the hybrid mbr method has higher denitrogenation ability.

(2) biomass is many, no excess sludge.In a single day carbon fiber bar is put into water and just can be scattered rapidly, and adding it all has trickle concaveconvex structure on surface separately, can form huge surface-area, can adsorb a large amount of microorganisms, and promptly microbial biomass is many.Simultaneously, because the apposition growth of microorganism, the microbial film water ratio is lower, and the biomass of reactor unit volume can be up to 5～20 times of activated sludge process, so this device processes effect is better.Perching the biology of more higher trophic level on the microbial film, its food chain is than the length among the MBR, and mud is trapped within inside reactor, has reduced the sludge disposal expense.

(3) the carbon fiber bar filler have environment zero load, non-secondary pollution, the infringement of no species, advantage such as safety, light weight, economic durable and effect are remarkable.

(4) can realize full automatic control to hybrid mbr, be convenient to best flow process is selected and debugged.

Description of drawings

Fig. 1 is a section of structure of the present invention;

Fig. 2 is the carbon fiber bar filler.

Among Fig. 1: 1. distribution reservoir 2. intake pumps 3. liquidometers 4. under meters 5. reactors 6. micro porous aeration heads 7. carbon fiber bar fillers 8. hollow fiber film assemblies 9. air flowmeter 10. go out water pump 11.PLC Controlling System 12. self-acting valves 13. shore pipes 14. pneumatic pumps.

Embodiment

After this hybrid mbr was handled, effluent quality reached GB 18596-2001 " livestock and poultry breeding industry pollutant emission standard " requirement, COD 100～400 mg/L after the film water outlet, NH with certain pig farm anaerobic digestion solution ₃-N 40～80mg/L TP 5～8mg/L.

Specific implementation process is as follows:

(1) piggery wastewater through holding back of mechanical grille, is removed macrobead pollution substance and floating matter in the sewage after the sewage collecting pipe network is collected, and waste water enters methane-generating pit.

(2) waste water flows into methane-generating pit, through efficient anaerobic digestion, after removing most COD acquisition biogas, regulates water quality and quantity through settling tank.

(3) regularly get the water inlet of anaerobic digestion solution as hybrid mbr, system operates to the water of being back to back, through hybrid mbr aerobic/the oxygen nitration denitrification of holding concurrently after, the pollutents such as COD, ammonia nitrogen and phosphorus of removal waste water that can be a large amount of.

Claims

1. handle the piggery wastewater membrane bioreactor, comprise distribution reservoir, turnover water pump, liquidometer, under meter, carbon fiber bar filler, hollow fiber film assembly, air flowmeter, PLC Controlling System, aeration head, pneumatic pump, it is characterized in that:

(1) in membrane bioreactor, adds and fixed carbon cellulose fiber filler;

(2) each components and parts of described reactor connect like this: distribution reservoir (1), intake pump (2), under meter (4) connect successively, link to each other with reactor (5) by water distribution pipe, contact with carbon fiber bar filler (7), hollow fiber film assembly (8) with go out water pump (10) and be connected, aeration head (6) is arranged on the bottom of reactor, pneumatic pump (14) is connected with air flowmeter (9), and liquidometer (3) places the right top of reactor, and shore pipe (13) is arranged on the bottom of reactor.

2. processing piggery wastewater new membrane bio-reactor according to claim 1 is characterized in that: described carbon fiber bar filler is to be gathered by 12000 threads by 7 microns of diameters of polyacrylic acid macrofiber manufacturing to form.