CN101376538A

CN101376538A - Powdered activated charcoal strengthened built-in beam type membrane bioreactor

Info

Publication number: CN101376538A
Application number: CNA2007101484401A
Authority: CN
Inventors: 亚蕾
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-29
Filing date: 2007-08-29
Publication date: 2009-03-04

Abstract

The invention relates to a treatment process for enhancing a membrane bioreactor by using powdery activated carbon. The process adopts a novel bundle-type hollow fibrous membrane assembly. By adding powdery activated carbon, the biological system is allowed to form granular sludge with good settling property more easily, thereby reducing the blockage of the sludge in the hollow fibrous membrane. Additionally, the synergistic effect between the powdery activated carbon and the membrane bioreactor can adsorb and decompose the organic substances that are hard to be biologically degraded in the waste water, and improve the treatment capacity of the system and the water quality of the effluent. The specially-designed bundle-type hollow fibrous membrane assembly exhausts the air completely during the operation, prevents the sludge blockage and ensures good air-purging effect and stable water head drop (WHD).

Description

The powdered activated charcoal strengthened built-in beam type membrane bio-reactor

Technical field:

The present invention is a kind of novel, the efficient water technology that effects such as charcoal absorption, biological degradation, membrane sepn are organically combined, and is mainly used in many aspects such as the pre-treatment of micro-polluted drinking water source, municipal wastewater processing and industrial sewage processing.

Background technology:

Present China's water resources critical shortage, according to 1996 to the investigation of 149 countries and regions in the world, China's water resources ownership per capita comes 109 in the world, only is 1/4 of world average level.Meanwhile, China's water utilization rate is low, and the water serious waste such as China in 2002 per ten thousand yuan of gross national product water withdrawals 537m3, is 4 times of world average level.China's recycling rate of water used by the industries less than 60%, lower by 15%～25% than developed country, the imbalance between supply and demand of water resources becomes increasingly conspicuous.

Obtain extensive support from city domestic sewage and industrial effluent reusing fresh water in recent years with the idea of saving limited Freshwater resources, membrane bioreactor (Membrane Bioreactor, MBR) the technology technology embodiment of this idea just.Membrane bioreactor is in conjunction with growing up on traditional biological treatment and the membrane separation technique basis.But in the engineering of membrane bioreactor is used, thereby dirty stifled frequent back flushing and unreasonable energy dissipation, the too high problem of running cost of causing of membrane module designs of flux decline that cause of film exists always.And also ubiquity of the problem that some hardly degraded organic substances can not effectively be removed in membrane bioreactor in industrial sewage is handled.Therefore, the engineering of present built-in membrane bioreactor is used strategic point two problems to be solved: the one, continue to optimize membrane module structure, and reduce the energy consumption of film silk aeration cleaning, the stability of raising membrane flux; The 2nd, the reinforced film biological reactor processing power, the clearance of increase hardly degraded organic substance improves effluent quality.

Summary of the invention:

The invention provides a kind of novel built-in pencil membrane module, bubble aeration during this membrane module adopts, the aeration end is in the membrane module bottom, and the water side is on membrane module top.Because the film silk has fixedly adopted the structure of getting one's things ready, the upper membrane silk adopts even multi beam structure, even tight structure is adopted in middle bottom, add the bottom gas distribution structure of uniform aeration, formed good slug flow fluidised form, hollow fibre filament aeration cleaning performance is good, and power consumption is low, avoided a large amount of air wastes in other membrane module aeration cleaning process, the bad situation of film cleaning performance takes place.

In engineering is used, in biochemical reactor, add a certain proportion of Powdered Activated Carbon, and replace second pond to carry out mud-water separation with this novel built-in beam type membrane module, because the crown_interception of hollow-fibre membrane, biophase is very abundant in the system, and sludge quantity also increases substantially, and can reach the scope of 10g/l～15g/l, this will bring three advantages: the one, and the increase of sludge quantity has reduced the required volume of biochemical system, has improved volumetric efficiency; The 2nd, some biophase tunicles that run off are easily held back, and the also corresponding enhancing of system processing power is as the denitrogenation dephosphorizing ability of system; The 3rd, because the effect of hollow-fibre membrane, system's effluent quality increases substantially, and suspended substance, bacterium are reduced to the level that is fit to reuse.And adding of Powdered Activated Carbon also brought a series of synergistic effects: the first, Powdered Activated Carbon makes the easier granule sludge that becomes of mud, compares with floc sludge, and granule sludge can reduce the dirt of film silk stifled; The second, because Powdered Activated Carbon to constantly the washing away of film silk, reduces the accumulation of film silk surface organic matter, make the film silk can keep higher flux level always; Three, the adsorption of gac can be enriched in some unmanageable organism in the system, and by the biological degradation of spoil disposal and long period, this part material obtains removing, and this has just strengthened the removal ability of membrane bioreactor to hardly degraded organic substance.

Can adjust the ratio that adds of Powdered Activated Carbon in engineering is used flexibly, different treatment effects and processing power have formed system function flexibly.Along with excess sludge is discharged Powdered Activated Carbon outside the system, be back to system after can adopting the mode of high temperature or advanced oxidation to regenerate.

Description of drawings:

Fig. 1 is a systematic schematic diagram of the present invention.

Fig. 2 is built-in beam type membrane assembly structure figure.

Embodiment:

As shown in Figure 1, organic waste water 1 enters in the biochemical reaction groove 6,7, can be made as one section anoxic and Aerobic Pond 7 with 6 according to requirement of engineering and form nitrated-denitrification denitrogenation technology, also can be set as two phase anaerobic with 6 and form denitrogenation-dephosphorization process.Simultaneously add a certain amount of Powdered Activated Carbon 2 in system, excess sludge and part Powdered Activated Carbon 8 discharge systems handle and regenerate, and the Powdered Activated Carbon after the regeneration is back to system.In biochemistry pool, place pencil membrane bioreactor 5, the water extraction system after external vacuum pump 3 will be handled, Aeration fan 4 is introduced the aeration cleaning that membrane module carries out the film silk with air.In service in system, water outlet 3 and aeration 4 all are intermitten services.

As shown in Figure 2, be the structure of built-in beam type membrane module, system's water outlet is in the upper end 14, and the air intake aeration is in the lower end 13.Bundle formula film silk is arranged vertically, and 11 are even multi beam structure in the upper end, and middle bottom 12 is even tight structure, and this structure can fully be arranged diffusing air, prevent sludge blockage.Aeration adopts the mesopore aeration, and aeration plate 15 openings are even, are in operation to form good slug flow state.Can be arranged in some this film monomers in the film group in engineering and use, inlet pipe and rising pipe are connected on the house steward, connect corresponding blower fan and vacuum pump.

Claims

1. the powdered activated charcoal strengthened built-in beam type membrane bioreactor technology of organic sewage biological treatment, it is characterized in that: a kind of built-in beam type membrane module of special tectonic adds Powdered Activated Carbon, the cleaning of reinforced film and organic removal in biochemical system.

2. powdered activated charcoal strengthened built-in beam type membrane bioreactor technology according to claim 1, bundle formula membrane module 5 is characterised in that: bundle formula film silk is arranged vertically, 11 are even multi beam structure in the upper end, middle bottom 12 is even tight structure, system's water outlet is in the upper end 14, and the air intake aeration is in the lower end 13.Aeration adopts the mesopore aeration, and aeration plate 15 openings are even, are in operation to form good slug flow state.Can be arranged in some this film monomers in the film group in engineering and use, inlet pipe and rising pipe are connected on the house steward, connect corresponding blower fan and vacuum pump.

3. powdered activated charcoal strengthened built-in beam type membrane bioreactor technology according to claim 1, powdered activated charcoal strengthened technology is characterised in that: the first, system adds a certain proportion of Powdered Activated Carbon 2, control certain water inlet organic loading, can make the mud in the biochemistry pool 6,7 become granule sludge, reduce the dirt of film silk stifled by the reinforcement sludge proterties; The second, Powdered Activated Carbon reduces the accumulation of film silk surface organic matter along with current and aeration constantly wash away the film silk, has strengthened the cleaning of film silk; Three, the adsorption of Powdered Activated Carbon can be enriched in some unmanageable organism in the system, and by the biological degradation of spoil disposal and long period, this part material obtains removing, and has strengthened the removal ability of membrane bioreactor to hardly degraded organic substance.