CN100439263C

CN100439263C - High efficiency, low energy consumption waste water treating and reutilizing process

Info

Publication number: CN100439263C
Application number: CNB2006100384717A
Authority: CN
Inventors: 郑俊; 王健; 刘光春; 王爱兵
Original assignee: 郑俊
Current assignee: Huaqi Environment Protection Science and Technology Co., Ltd.
Priority date: 2006-02-24
Filing date: 2006-02-24
Publication date: 2008-12-03
Anticipated expiration: 2026-02-24
Also published as: CN1821124A

Abstract

The present invention discloses sewage treating and recycling technology having the advantages of high efficiency and low energy consumption. The present invention is mainly characterized in that a majority of organic pollutants and ammoniacal nitrogen in sewage are transformed and decomposed by utilizing an anoxic filtering pond which has no need of energy consumption and is filled with a filtering layer of suspending biological filtering materials of which the density is less than that of water, and simultaneously, a majority of suspended matter in the sewage is trapped to obtain clear outflow water. Afterwards, an aerobic aerating biological filtering pond is used for biological oxidation treatment, and residual organic pollutants and ammoniacal nitrogen in the sewage are decomposed by oxidation and transformed through metabolism to purify the sewage and to reach the standard of regenerated recycle water which is directly supplied to users. A water-quality index in-line inspecting instrument in installed in a final water-outflow channel of the aerobic aerating biological filtering pond, and the quantity of oxygen supply is regulated by a special control program for maximumly saving energy under the condition of ensuring the quality of outflow water. The integral technology has the advantages of favorable effect of sewage treatment, small land occupation area, low investment and low operating cost, and can simultaneously once directly treat sewage to achieve water quality requirements of regenerated water which can be utilized as resources.

Description

A kind of efficient, low energy consumption waste water treating and reutilizing process

Technical field

The present invention relates to that anoxic that a kind of employing need not energy consumption is filtered and the BAF of less energy-consumption structure is integrated, cities and towns and community life sewage directly can be handled the waste water treating and reutilizing process of middle water reuse standard.

Background technology

Cities and towns and community life sewage are the principal elements that causes China's water to pollute, and the big and dispersion of such sewage quantity mainly contains organic pollutant and plant nutrient such as nitrogen, phosphorus etc. in the sewage.Organic pollutant can carry out oxygenolysis after entering surface water body, the a large amount of dissolved oxygens in the water body in decomposition course, have been consumed, finally make water body generation anoxic and the hydrocoles such as fish that live in the water body can't be breathed and death, its corpse anaerobic digestion in water produces foul gass such as hydrogen sulfide, methane, make smelly, the blackout of water body simultaneously, this water body valley environment situation is worsened.Plant nutrient such as nitrogen, phosphorus enters the eutrophication that can cause water body behind the surface water body, makes algal bloom and influences source quality.Water pollutes the subject matter that has become China's environmental pollution, China is the country that the used water resource lacks relatively simultaneously, the used water resource is well below global mean value per capita, water body constantly is subjected to polluting and causes a lot of places of China the water lack of water to occur, the discharging of large amount of sewage is except that causing water pollution, also caused the waste of water resources, so adopt suitable water technology dispose of sewage and will handle after the sewage direct reuse in the life or industrial production will be very necessary, meet the requirement that China builds a conservation-minded society, also meet the requirement of recycling economy.

China pays much attention to water pollution problems for a long time, built a large amount of sewage works, but because existing technology is mainly limited to Activated Sludge Process and sewage disposal can only be arrived certain emission request, and can not directly handle reuse standard, a kind of measure of pollution abatement at last, and do not reach the purpose of regeneration, and treatment effect instability, hydraulic detention time is long, the construction investment height, floor space is big, the energy consumption height, the running maintenance complexity is so it is good to develop a kind of treatment effect, take up an area of little, invest low, but the waste water treating and reutilizing process that working cost is few and can once sewage directly be handled recycling will meet the Strategy for economic development of China.

Summary of the invention

But the purpose of this invention is to provide a kind of low energy consumption waste water treating and reutilizing process that cities and towns and community life sewage can be handled direct reuse.

Technical scheme of the present invention is:

1, sewage at first enters and is filled with the anoxic filtering basin 19 of density less than the suspended biological media filtration layer 2 of water, carrying out anoxic filters, the Chi Rongzhong of suspended biological filter material layer 2 bottoms grows to have with the suspended sludge state and has acidication microorganism and anoxic microorganism 18, the domestication growth has miscellaneous anoxic microorganism on the suspended biological filtrate 2, the acidication microorganism can be hydrolyzed into small organic molecule with larger molecular organics, the anoxic microorganism can transform a large amount of small organic molecules in the sewage and decompose under the condition of aerobic gas not, simultaneously the nitrate-nitrogen reduction in the water is become nitrogen and finishes denitrification process, the nitrogen content that can cause the body eutrophication problem in the water is minimized, simultaneously the most suspended substances matter in the sewage is trapped within the hole between the suspended biological filtrate, make water outlet limpid, and enter out water channel 1 by exhalant region 3.

2, enter aerobic aeration biological filter 20 through the water outlet after 19 processing of anoxic filtering system by rising pipe 1 and carry out oxide treatment, water distribution system 17 tops in the BAF 20 are filled with the spherical light multiporous biological filtrate 7 of density greater than water, this biofilter material has huge specific surface area, crude and the porous in surface, domestication is attached with highdensity obligate microorganism above, by gas blower 15, steam line 16 and highly effective air diffuser system 8 oxygen supply in water that is installed in the pond, make the obligate microorganism under the aerobic respiration effect, by metabolism with remaining organic pollutant in the sewage, ammonia nitrogen carries out oxygenolysis and conversion, organic pollutant finally is decomposed into inorganicss such as carbonic acid gas and water, ammonia nitrogen is oxidized to nitrate, enters clear water zone 6 and final by going out water channel 29 and will reach purifying waste water of regeneration water quality standard by rising pipe 2 10 to supply with the user thereby sewage is purified.

3, for making the stable regeneration water quality standard that reaches of final treat effluent, go out to be equipped with in the water channel 29 the on-line detector device 11 of monitoring organic pollutant, ammonia nitrogen concentration in aerobic aeration biological filter 20, detection data in the water outlet are fed back to the PLC computer workstation system 12 of this technology, come automatic dynamic to adjust the rotating speed of gas blower 15 by special procedure and by umbilical cable 13 by frequency transformer 14, make the oxygen amount of its supply satisfy operating requirement just, farthest energy-conservation under the condition that guarantees effluent quality.

The present invention be need not energy consumption anoxic is filtered and the BAF coupling of less energy-consumption structure forms energy-conservation sewage disposal and regeneration technology; it is high to have the load of processing; energy consumption is low; hydraulic detention time is short; effluent quality is good; the characteristics that sludge yield is few; compare with existing sewage treatment process; its innovative point is the emission request that not only satisfies treating water; but but sewage disposal is arrived direct reuse in industrial circulating water by the present invention; reclaimed water; the standard of municipal administration landscape water; both administered pollution; protected environment; having saved water resources simultaneously, is typical recycling economy Technology.By the sewage that the present invention handles, major control index concentration such as the organic pollutant in its final treat effluent water quality, ammonia nitrogen, suspended substance are well below national reuse of wastewater standard.

Description of drawings:

Fig. 1 is a waste water treating and reutilizing process schematic flow sheet of the present invention

Embodiment:

Below in conjunction with accompanying drawing waste water treating and reutilizing process of the present invention is described further.

As shown in Figure 1, sewage at first enters anoxic filtering basin 19, microorganism is divided into two portions in this pond, a part exists with the suspended sludge state as 18 middle and lower parts that are shown in the pond among Fig. 1, comprising acidication microorganism and anoxic microorganism, another part is in the middle and upper part in pond, and main apposition growth is on suspended biological filtrate 2, based on the anoxic microorganism.During work, sewage is entered by anoxic filtering basin water inlet system 1, a part of small organic molecule that can directly penetrate the anoxic microorganism wall is directly absorbed degraded by microorganism in the sewage, and can not directly penetrating the larger molecular organics of anoxic microorganism wall, another part it is hydrolyzed by the acidication microorganism, larger molecular organics is hydrolyzed to small organic molecule, absorb and degrade by adhering to anoxic microorganism on it entering suspended biological filter material layer 2 back, suspended substance in the sewage is held back by suspended biological filter material layer 2 simultaneously, the SS of water outlet is reduced greatly, organic pollutant in this process degradable raw waste water more than 65%, and do not need energy consumption, working cost is extremely low; The treat effluent of anoxic filtering basin enters out water channel 1 and directly enters follow-up aerobic aeration biological filter 20 by rising pipe 1 carries out oxide treatment, by gas blower 15 and airduct 16 and provide by highly effective air diffuser system 8 under the condition of oxygen, utilize aerobic de-carbon microorganism of a large amount of obligates of apposition growth on spherical light multiporous biological filtrate 7 and nitrated microorganism not to have in to the anoxic filtering basin residual organic substances and the ammonia nitrogen of degraded to carry out aerobic thorough decomposition, filteration by fixed bed biofilter material 7 makes water outlet limpid simultaneously, make organism in the final outflow water, ammonia nitrogen, indexs such as SS reach the regeneration water quality standard, but direct reuse.For guaranteeing stable effluent quality and energy-conservation, water quality on-line detector device 11 in the effluent trough is transferred to PLC computer workstation system 12 with the water-quality guideline of measuring, and by its program calculating required oxygen-supplying amount is controlled gas blowers 15 rotating speeds by frequency transformer 14 and accurately supply with, it is required to satisfy biological degradation.

Attempt one according to the present invention technology implement city domestic sewage is handled to middle water reuse example, described in detail:

Certain municipal effluent, the discharge of sewage is 40000 ton per days, enters the preceding pollutent index of this art breading to be: COD=350～400mg/L, BOD=130～170mg/L, SS=250mg/L, ammonia nitrogen=35mg/L.This sewage at first enters 2 anoxic filtering basin, hydraulic detention time HRT=3hr, upflow velocity 2m/h, pond body height overall 6.8m, available depth 6.5m in the pond, suspended biological media filtration floor height 2m wherein, the bottom is provided with the pond height 4m that the suspended sludge state exists acidication microorganism and the existence of anoxic microorganism, suspended biological media filtration layer top clear water layer height 0.5m, through the effluent quality index after this anoxic filtering basin processing be: COD=120～140mg/L, BOD=60～85mg/L, SS=40mg/L, ammonia nitrogen=30mg/L, this water outlet is carried out precision processing from flowing into 4 follow-up aerobic aeration biological filters.Aerobic aeration biological filter height overall 6m, inside is provided with filter plate, filter plate height at the bottom of the pond is 1.2m, special-purpose water distribution filter is installed on the filter plate, the diameter ∮ 2.5～4mm spherical light multiporous biological filtrate that is filled with the 3.5m height is stacked on filter plate top, the high clear water zone of 1.0m is arranged above the biofilter material layer, superelevation 0.3m, in biofilter material layer bottom the oxygen supply in water of highly effective air diffuser system is installed, water outlet after the anoxic filtering basin are handled is adhered in the aerobic aeration biological filter under aerobic de-carbon microorganism of the obligate that is grown on the biofilter material and the nitrated action of microorganisms and is carried out aerobic respiration, the biofilter material layer filters the suspended substance in the water simultaneously, make the pollutent index of final outflow water be: COD≤30mg/L, BOD≤5mg/L, SS≤10mg/L, ammonia nitrogen≤5mg/L reaches national reuse of wastewater standard, and after sterilizing direct reuse.

Claims

1, a kind of waste water treating and reutilizing process, described waste water treating and reutilizing process is as follows:

(1), sewage at first enters and is filled with the anoxic filtering basin (19) of density less than the suspended biological media filtration layer (2) of water, carrying out anoxic filters, the Chi Rongzhong of suspended biological filter material layer (2) bottom grows to have with the suspended sludge state and has acidication microorganism and anoxic microorganism (18), suspended biological filtrate (2) is gone up the domestication growth miscellaneous anoxic microorganism, the acidication microorganism can be hydrolyzed into small organic molecule with larger molecular organics, the anoxic microorganism can transform a large amount of small organic molecules in the sewage and decompose under the condition of aerobic gas not, simultaneously the nitrate-nitrogen reduction in the water is become nitrogen and finishes denitrification process, the nitrogen content that can cause the body eutrophication problem in the water is minimized, simultaneously the most suspended substances matter in the sewage is trapped within the hole between the suspended biological filtrate, make water outlet limpid, and enter out water channel one (4) by exhalant region (3);

(2), the treat effluent of anoxic filtering basin (19) enters out water channel one (4) and enters aerobic aeration biological filter (20) by rising pipe one (5) carries out oxide treatment, water distribution system (17) top in the BAF (20) is filled with the spherical light multiporous biological filtrate (7) of density greater than water, this biofilter material has huge specific surface area, crude and the porous in surface, domestication is attached with highdensity obligate aerobic microbiological above, by gas blower (15), steam line (16) and be installed on highly effective air diffuser system (8) oxygen supply in water in the pond, make the obligate aerobic microbiological under the aerobic respiration effect, by metabolism with remaining organic pollutant in the sewage, ammonia nitrogen carries out oxygenolysis and conversion, organic pollutant finally is decomposed into carbonic acid gas and water, ammonia nitrogen is oxidized to nitrate, enters clear water zone (6) also finally by going out water channel two (9) and will reach purifying waste water of regeneration water quality standard by rising pipe two (10) to supply with the user thereby sewage is purified;

(3), for making the stable regeneration water quality standard that reaches of final treat effluent, go out the on-line detector device (11) of monitoring organic pollutant, ammonia nitrogen concentration is installed in the water channel two (9) in aerobic aeration biological filter (20), detection data in the water outlet are fed back to PLC computer workstation system (12), come automatic dynamic to adjust the rotating speed of gas blower (15) by special procedure and by umbilical cable (13) by frequency transformer (14), make the oxygen amount of its supply satisfy operating requirement just, farthest energy-conservation under the condition that guarantees effluent quality.

2, waste water treating and reutilizing process as claimed in claim 1, it is characterized in that: the microorganism that participates in reaction in the anoxic filtering basin pond is divided into the acidication microorganism and the anoxic microorganism that exist with suspended state of suspended biological media filtration layer bottom, and miscellaneous anoxic microbial film of apposition growth on the suspended biological filtrate, two portions action of microorganisms emphasizes particularly on different fields, in whole degradation process, all do not need the outside that oxygen and energy consumption are provided, belong to the anoxic degradation process, and the suspended substance in the sewage can be trapped within the suspended biological media filtration layer, make water outlet limpid, biofilter material is the suspension filter bed.

3, waste water treating and reutilizing process as claimed in claim 1, it is characterized in that: participate in the main apposition growth of aerobic microbiological of reaction in the pond, aerobic aeration biological filter on the spherical light multiporous biological filtrate of loading in the pond, and providing under the condition of oxygen, make the obligate aerobic microbiological carry out aerobic respiration, and remaining organic pollutant, ammonia nitrogen in the sewage are carried out oxygenolysis and conversion by its metabolism, also filtration of biofilter material simultaneously, biofilter material is fixing filter bed, highly effective air scatterer supply oxygen.

4, waste water treating and reutilizing process according to claim 1, it is characterized in that: for making the stable regeneration water quality standard and energy-conservation that reaches of final treat effluent, water-quality guideline on-line detector device is installed in the final outflow water canal, and will detect data feedback PLC computer workstation and come automatic dynamic to adjust the rotating speed of gas blower by special procedure by frequency transformer, make the oxygen amount of its supply satisfy operating requirement just.