CN104163543B - A kind of waste disposal plant and sewage water treatment method thereof - Google Patents

Abstract

The invention relates to a sewage treatment device and a sewage treatment method thereof, which are used to treat mixed industrial sewage mainly including antibiotic pharmaceutical sewage which is extremely difficult to biodegrade. AA/O tanks, biological aerated filters, flocculation sedimentation tanks and sludge thickening tanks, through mechanical interception, chemical oxidation, multiple biodegradation and chemical flocculation, remove nitrogen and phosphorus, and have achieved good treatment effects. The indicators of effluent CODcr, NH ₃ -N and TP all meet the first-class discharge standard. The treatment effect of this method is stable and reliable, and the operation cost is low. The improved anoxic tank, anaerobic tank, aerobic tank and other biochemical reaction tanks all have independent mud-water automatic separation devices, which eliminates sludge backflow, greatly reduces power consumption, and reduces sewage treatment costs. Double superiority in economy and technology. The coupling method proposed by the invention is not easily affected by the fluctuation of influent water quality and other factors, and has the characteristics of strong process shock resistance, good sludge settling performance, no sludge bulking phenomenon, etc., and has wide application prospects.

Description

A kind of sewage treatment device and sewage treatment method thereof

technical field

The invention relates to the field of sewage treatment, in particular to a sewage treatment device and a sewage treatment method thereof.

Background technique

At present, food, papermaking, printing and dyeing, pharmaceutical, chemical and other enterprises discharge a large amount of sewage in the production process. These sewage belong to organic wastewater. This organic sewage needs to be treated before it can be discharged into nature, otherwise it will be seriously polluted if it is directly discharged into natural water bodies. Water Environment.

In recent years, the problems of water environment pollution and water eutrophication have become increasingly serious. Nitrogen and phosphorus are the main factors causing water eutrophication. With the improvement of public environmental awareness and stricter restrictions on nitrogen and phosphorus discharge at home and abroad, the research and development of economical and efficient organic matter, nitrogen and phosphorus co-processing technology has always been a hot spot in the field of water pollution control engineering.

The mixed industrial wastewater in industrial areas is difficult to treat, especially the mixed industrial wastewater mainly composed of antibiotic production wastewater. Antibiotic production wastewater is a kind of refractory organic wastewater with complex components, high chroma, high biological toxicity, and high concentration of various inhibitory substances. It is currently a difficult and hot spot in sewage treatment at home and abroad. A lot of experimental research work has been done on this kind of wastewater treatment at home and abroad, such as the use of Fenton reagent method, photocatalytic oxidation method, ozone oxidation method and activated sludge method, etc., but these technologies have the disadvantages of large area, large investment and processing Due to the disadvantages of high cost and low compliance rate of wastewater treatment, it is greatly restricted in practical engineering promotion. The first phase project of an industrial area in Fujian Province adopted the coupling technology of "hydrolytic acidification + MSBR + flocculation sedimentation" to treat the mixed industrial wastewater mainly produced by antibiotics in this area. The effluent water quality CODcr, NH ₃ -N and TP and other pollutant discharge indicators can stably meet the requirements of the second-level standard of the national "Comprehensive Wastewater Discharge Standard"(GB8978-1996); the process has a stable treatment effect and is resistant to impact loads. Strong, the process combination is reasonable, but it can only meet the requirements of the second-level discharge standard; the second phase of the project adopts the composite technology of "hydrolytic acidification + MSBR + ozone oxidation + flocculation sedimentation + biological aerated filter", although it can meet the first-level discharge Standard requirements, but occupy a large area, high processing costs, complex operation and management.

The anaerobic/anoxic/aerobic method (ie AA/O method) biological denitrification and phosphorus removal is characterized in that although the process is simple, it can simultaneously remove nitrogen and phosphorus, the total residence time is short, the sludge is not easy to swell, and there is no need for dosing. The cost is low, but the AA/O method has the problem that it is difficult to further improve the phosphorus removal amount and nitrogen removal efficiency after a certain effect is achieved. Although the improved AA/O method combines the advantages of the A/O method and the improved UCT process, that is, an anaerobic/anoxic tank is added before the anaerobic tank, which is conducive to the release of phosphorus by the phosphorus-accumulating bacteria in the anaerobic tank and inhibits the release of filamentous bacteria. The reproduction of sludge and water improves the separation performance of mud and water, improves the operation stability and treatment effect, but there is a large return flow of sludge, which increases the cost of sewage treatment.

At present, domestic and foreign studies on the AA/O method and its deformation process mostly focus on domestic sewage, but there are few reports on the direct treatment of industrial wastewater by the AA/O method, especially the fresh industrial wastewater mainly composed of antibiotics and pharmaceuticals. According to reports, there is no report on the direct treatment of industrial waste water mainly composed of antibiotics and pharmaceuticals by the inverted AA/O method. Based on this, the inventor proposed to use the coupling method of "improved inverted AA/O method + biological aerated filter + flocculation sedimentation tank" to treat industrial sewage.

Contents of the invention

The object of the present invention is to provide a sewage treatment device and a sewage treatment method thereof, which can efficiently remove organic matters, simultaneously have high efficiency of denitrification and phosphorus removal, stable and reliable treatment effect, and low operating cost.

To achieve the above object, the present invention adopts the following technical solutions:

A kind of sewage treatment device, it comprises grid, grit chamber, regulating primary sedimentation tank, improved inverted AA/O tank (ie anoxic tank, anaerobic tank, aerobic tank), biological aerated filter tank, flocculation sedimentation tank pool and sludge concentration pool, the outlet of the anoxic pool is connected to the water inlet of the anaerobic pool, the water outlet of the anaerobic pool is connected to the water inlet of the aerobic pool, the anoxic pool, the anaerobic pool and the good The oxygen tanks are equipped with clapboards and mud hoppers, and the clapboards are set in the pools to divide the pools into two areas, one of which is a biochemical reaction area, and the other area is an automatic mud-water separation area. The upper end of the outer wall of the zone is provided with a water inlet, and the upper end of the outer wall of the automatic mud-water separation area is provided with a water outlet. The bucket is set at the bottom of the pool in the mud-water automatic separation area. The angle between the side wall of the mud bucket and the bottom of the pool is 20-70°, and the bottom of the mud bucket is equipped with a mud discharge device.

The angle between the partition and the upper surface of the pool is 20-90°.

The mud discharge device is a mud discharge pump with a perforated pipe.

A sewage treatment method, which adopts the above-mentioned sewage treatment device, and the method adopts the coupling method of "improved inverted AA/O method + biological aerated filter + flocculation sedimentation tank" to treat industrial sewage; The method specifically includes the following steps:

1) The industrial sewage flows into the grit chamber after the large pieces of dirt in the sewage are intercepted by the grille, and the sand is removed by sedimentation;

2) The sewage output from the upper part of the grit chamber flows into the primary sedimentation tank to adjust the water quality and water volume to a uniform level. At the same time, the sewage is fully mixed with the sludge in the tank, and some pollutants in the sewage are removed through the adsorption of the sludge;

3) Adjust the sewage output from the upper part of the primary sedimentation tank to react in turn through the improved inverted AA/O tank, stir in the anoxic tank to adjust the dissolved oxygen in the sewage to 0.2mg/L-0.5mg/L, and at the same time domesticate a class of The denitrifying phosphorus-accumulating bacteria group uses NO ₃ ^- -N as the final electron acceptor, and the denitrifying phosphorus-accumulating bacteria use NO ₃ ^- as the electron acceptor to use the internal carbon source in the sewage to simultaneously Realize denitrification and denitrification, removal of nitrate oxygen and anoxic phosphorus absorption; in the anaerobic pool, the dissolved oxygen content is strictly controlled to ≤0.2mg/L. Molecular organic matter is hydrolyzed into soluble organic matter to improve the biodegradability of sewage water quality, and at the same time fully release phosphorus; stir in the aerobic pool to adjust the dissolved oxygen in the sewage to 2mg/L-3mg/L, domesticate aerobic bacteria, Efficient degradation of organic matter and efficient biological phosphorus removal under the biological metabolism of aerobic bacteria;

4) Part of the sewage supernatant output from the aerobic tank flows back to the anoxic tank, and part of it flows into the biological aerated filter. In the biological aerated filter, through the synergistic effect of mechanical interception, chemical oxidation and biodegradation, the deep biological Degrade pollutants in sewage;

5) The sewage output from the biological aerated filter finally flows into the flocculation-sedimentation tank, and iron-based or aluminum-based flocculants are added to the flocculation-sedimentation tank to further remove residual pollutants through chemical flocculation, and finally achieve discharge standards.

The sludge in the regulating primary sedimentation tank is the sludge discharged from the anoxic tank, anaerobic tank, aerobic tank and flocculation sedimentation tank, which is transported to the regulating primary sedimentation tank through the sludge discharge pump, fully mixed with sewage, and the activated sewage The mud absorbs some pollutants in the sewage; the remaining sludge after the mud-water separation in the adjusted primary sedimentation tank is pumped into the sludge thickening tank for sludge thickening, dehydration, and drying.

The present invention adopts above technical scheme, and its beneficial effect is as follows:

(1) The "improved inverted AA/O method + biological aerated filter + flocculation sedimentation tank" coupling method proposed by the present invention meets the requirements _of GB8978-1996 "Sewage Under the premise of the third-level discharge standard of the "Comprehensive Discharge Standard", the treatment of mixed industrial sewage mainly containing antibiotic pharmaceutical sewage, which is extremely difficult to biodegrade, has achieved good treatment results. The effluent CODcr, NH ₃ -N and TP indicators are all It reaches the "first-class emission standard", and the treatment effect of this process is stable and reliable, and the operation cost is low.

(2) Compared with the combined process of "hydrolytic acidification + MSBR + ozone oxidation + flocculation sedimentation + biological aerated filter", the present invention has smaller footprint, less construction investment, better treatment effect and lower treatment cost , The operation and management are simpler, and its effluent stability reaches the "first-class standard", which has double advantages of economy and technology.

(3) The improved anoxic tank, anaerobic tank, aerobic tank and other biochemical reaction tanks all have independent mud-water automatic separation devices, which eliminates the need for sludge backflow, greatly reduces power consumption, and reduces sewage treatment. cost, the mud-water separation time is controlled at 0.2-2.5h, and each pool can control the sludge concentration according to the operation needs, so that the activated sludge in each pool can grow in their own optimal environment without interfering with each other and being independent of each other. Improved biological treatment efficiency.

(4) Compared with the traditional AA/O method and the improved AA/O method, the improved inverted AA/O method has significantly lower P content in the effluent, and because the anoxic section is located at the beginning of the process, denitrification can preferentially obtain carbon sources, so the reverse The nitrification rate can also be increased by 15% to 39%.

(5) The coupling method proposed by the present invention handles mixed industrial sewage mainly based on antibiotic pharmaceuticals, is not easily affected by fluctuations in influent water quality and other factors, has a process with strong impact load resistance, and is easy to obtain stable CODcr, phosphorus and nitrogen removal, And the separation of biochemical sludge will not affect the microbial activity, the sludge settling performance is good, and there is no sludge bulking phenomenon. The sewage treatment process of the present invention provides a new method for the efficient treatment of mixed industrial sewage mainly including antibiotic pharmaceutical sewage which is extremely difficult to biodegrade, has a very wide application prospect, and also provides a new method for the efficient treatment of other difficult-to-treat mixed industrial sewage new way.

Description of drawings

The present invention will be further described now in conjunction with accompanying drawing:

Fig. 1 is the flow chart of sewage treatment device and sewage treatment method thereof of the present invention;

Fig. 2 is a schematic view of the sewage treatment device structure of the present invention;

Fig. 3 is a second schematic diagram of the structure of the sewage treatment device of the present invention.

Detailed ways

As shown in Figure 1, 2 or 3, a sewage treatment device includes a grid 1, a grit chamber 2, a regulating primary sedimentation tank 3, an improved inverted AA/O tank (that is, an anoxic tank 4, an anaerobic tank 5. Aerobic tank 6), biological aerated filter tank 7, flocculation sedimentation tank 8 and sludge concentration tank 9, the outlet of the anoxic tank 4 is connected to the water inlet of the anaerobic tank 5, and the anaerobic tank 5 The water outlet is connected to the water inlet of the aerobic pool 6, and the anoxic pool 4, the anaerobic pool 5 and the aerobic pool 6 are all provided with a dividing plate 10 and a mud bucket 11, and the described dividing plate 10 is located in the pool , the pool is divided into two areas, one of which is a biochemical reaction area 12, and the other area is an automatic mud-water separation area 13, the upper end of the outer wall of the biochemical reaction area 12 is provided with a water inlet, and the mud-water automatic separation area 13 The upper end of the outer wall of the outer wall is provided with a water outlet, and the partition plate 10 is provided with a muddy water inlet and outlet 14 at the middle and lower part near the bottom of the pool, and the mud bucket 11 is arranged at the bottom of the pool in the muddy water automatic separation area 13, and the mud bucket The angle between the side wall of 11 and the bottom of the pool is 20-70 °, and the bottom end of mud bucket 11 is provided with mud discharge device 15.

The included angle between the partition plate 10 and the upper surface of the pool is 20-90°.

The mud discharge device 15 is a mud discharge pump with a perforated pipe.

A sewage treatment method, which adopts the above-mentioned sewage treatment device, and the method adopts the coupling method of "improved inverted AA/O method + biological aerated filter + flocculation sedimentation tank" to treat industrial sewage; The method specifically includes the following steps:

1) The industrial sewage flows into the grit chamber 2 after the large pieces of dirt in the sewage are intercepted by the grid 1, and the sand is removed by sedimentation;

2) The sewage output from the upper part of the grit chamber 2 flows into the regulating primary sedimentation tank 3 to adjust the water quality and water volume to be uniform, and at the same time the sewage is fully mixed with the sludge in the tank, and some pollutants in the sewage are removed through the adsorption of the sludge;

3) Adjust the sewage output from the upper part of the primary sedimentation tank 3 to react in turn through the improved inverted AA/O tank, stir in the anoxic tank 4 to adjust the dissolved oxygen in the sewage to 0.2mg/L-0.5mg/L, and domesticate the A type of denitrifying phosphorus-accumulating bacteria group that uses NO ₃ ^- -N as the final electron acceptor. The denitrifying phosphorus-accumulating bacteria use NO ₃ ^- as the electron acceptor to utilize the internal carbon source in the sewage, through "one carbon dual-use" The method realizes denitrification and denitrification, removal of nitrate oxygen and anoxic phosphorus absorption at the same time; in the anaerobic tank, the dissolved oxygen content is strictly controlled to be ≤0.2mg/L. Soluble macromolecular organic matter is hydrolyzed into soluble organic matter to improve the biodegradability of sewage water quality, and at the same time fully release phosphorus; stir in the aerobic pool to adjust the dissolved oxygen in the sewage to 2mg/L-3mg/L, and domesticate aerobic bacteria Group, under the biological metabolism of aerobic bacteria, efficiently degrades organic matter and efficiently removes phosphorus;

4) Part of the sewage supernatant output from the aerobic tank 6 returns to the anoxic tank 4, and part of it flows into the biological aerated filter 7. In the biological aerated filter 7, through the synergistic effect of mechanical interception, chemical oxidation and biodegradation , continue to deeply biodegrade the pollutants in the sewage;

5) The sewage output from the biological aerated filter 7 finally flows into the flocculation sedimentation tank 8, and iron or aluminum flocculants are added into the flocculation sedimentation tank 8 to further remove residual pollutants through chemical flocculation, and finally achieve discharge standards.

The sludge in the described regulating primary sedimentation tank 3 is the sludge discharged from the anoxic tank 4, the anaerobic tank 5, the aerobic tank 6, the biological aerated filter tank 7 and the flocculation sedimentation tank 8, and is transported by the sludge pump To adjust the primary settling tank 3, fully mix with the sewage, produce activated sludge to absorb some pollutants in the sewage, after adjusting the primary settling tank 3, the remaining sludge is pumped into the sludge thickening tank 9 for sludge concentration, Dehydrate and press dry.

Claims (5)

1. a waste disposal plant, comprise grid, settling pit, regulate preliminary sedimentation tank, modified version inversion A A/O pond, BAF, flocculation sedimentation tank and sludge thickener, it is characterized in that: in described modified version inversion A A/O pond, anoxic pond water outlet is connected with anaerobic pond water-in, described anaerobic pond water outlet is connected with Aerobic Pond water-in, described anoxic pond, dividing plate and bucket is equipped with in anaerobic pond and Aerobic Pond, described dividing plate is located in pond, pond is divided into Liang Ge district, one of them district is biochemical reaction zone, another district is the automatic disengaging zone of muddy water, the outer side wall upper end of described biochemical reaction zone is provided with water-in, the outer side wall upper end of the automatic disengaging zone of described muddy water is provided with water outlet, described dividing plate is being provided with muddy water import and export near the middle and lower part place at the bottom of pond, described bucket is located at bottom the pond of the automatic disengaging zone of muddy water, the sidewall of bucket and the angle at the bottom of pond are 20-70 °, the bottom of bucket is provided with mud discharging device.

2. a kind of waste disposal plant according to claim 1, is characterized in that: the angle of described dividing plate and pond upper surface is 20-90 °.

3. a kind of waste disposal plant according to claim 1, is characterized in that: described mud discharging device is the sludge pump of tape punching pipe.

4. have employed a sewage water treatment method for waste disposal plant as described in claims 1 to 3 any one, it is characterized in that: described method adopts " modified version inversion A A/O method+BAF+flocculation sedimentation tank " coupling process to process industrial sewage; The method specifically comprises the following steps:

1) industrial sewage retains in sewage through grid and flows into settling pit after bulk dirt, and precipitation removes the grains of sand;

2) sewage that settling pit top exports flows into and regulates preliminary sedimentation tank, and regulating water quality and the water yield are to homogenizing, and sewage fully mixes with the mud in pond, by the absorption of mud, except part pollutent in decontaminated water simultaneously;

3) sewage regulating preliminary sedimentation tank top to export reacts through modified version inversion A A/O pond successively, and in anoxic pond, the dirty dissolved oxygen in water of stirring and adjusting is in 0.2mg/L ~ 0.5mg/L, tames out a class with NO simultaneously ₃ ^--N is as the denitrification phosphorus-collecting flora of final electron acceptor(EA), and Denitrifying Phosphate Accumulating Organisms is with NO ₃ ^-as electron acceptor(EA), utilize the internal carbon source in sewage, realize denitrification denitrogenation by " a carbon double-purpose " mode simultaneously, remove nitre state oxygen and anoxic suction phosphorus; In anaerobic pond, control dirty dissolved oxygen in water≤0.2mg/L, under the effect of anaerobion, acidication reaction occurs, insoluble larger molecular organics is hydrolyzed into dissolved organic matter to improve the biodegradability of sewage quality, discharges phosphorus simultaneously; Dissolved oxygen amount in Aerobic Pond in stirring and adjusting sewage is in 2mg/L ~ 3mg/L, tames out aerobic flora, degradation of organic substances and biological phosphate-eliminating under the biological metabolism effect of aerobic bacteria;

4) the sewage supernatant liquor part exported in Aerobic Pond is back to anoxic pond, and a part flows into BAF, in BAF, by mechanical interception, chemical oxidation and biological degradation synergy, continues the pollutent in degree of depth biological degradation sewage;

5) sewage that BAF exports finally flows into flocculation sedimentation tank, adds iron system or AlSnSi alloy, by chemical flocculation effect, remove amounts of residual contamination further, finally realize qualified discharge in flocculation sedimentation tank.

5. a kind of sewage water treatment method according to claim 4, it is characterized in that: the mud in described adjustment preliminary sedimentation tank is the mud that anoxic pond, anaerobic pond, Aerobic Pond bucket and flocculation sedimentation tank are discharged, adjustment preliminary sedimentation tank is delivered to through sludge pump, fully mix with sewage, part pollutent in activated sludge absorption sewage; After regulating preliminary sedimentation tank mud-water separation, remaining mud pumps into sludge thickener again, carries out sludge condensation, dewaters, press dry.