CN210736473U - Pig farm waste water anaerobism is produced hydrogen and circulation retrieval and utilization processing apparatus - Google Patents
Pig farm waste water anaerobism is produced hydrogen and circulation retrieval and utilization processing apparatus Download PDFInfo
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Abstract
The utility model discloses a pig farm waste water anaerobism is produced hydrogen and circulation retrieval and utilization processing apparatus, including the grid canal, the MAP sedimentation tank, the waste water equalizing basin, anaerobism hydrogen production ware, the absorption tower, good oxygen biochemical pond, mix sedimentation tank and disinfection pond, the delivery port of grid canal connects the water inlet of MAP sedimentation tank, the delivery port on MAP sedimentation tank upper portion connects the water inlet of waste water equalizing basin through first play water pump, the delivery port of waste water equalizing basin passes through the water inlet that second play water pump connects anaerobism hydrogen production ware, the gas outlet on anaerobism hydrogen production ware top is through first pipeline, gaseous booster pump connects the absorption tower, the hydrogen outlet at absorption tower top connects the air inlet of air pocket through the second pipeline. The utility model discloses realize the purpose of the hydrogen of pig farm waste water anaerobism to showing and promoting the hydrogen efficiency of anaerobism and improving the hydrogen production reactor volume load, obtaining hydrogen purity and being greater than 90%, and can reduce the carbon emission of scale pig farm more than 80%, realize the target of pig farm waste water conversion living beings clean energy.
Description
Technical Field
The utility model relates to a hydrogen and circulation retrieval and utilization processing apparatus are produced to pig farm waste water anaerobism belongs to agricultural cultivation waste water treatment field, has realized pig farm waste water and has produced clean energy hydrogen and carry out waste water treatment back cyclic utilization's target at anaerobic treatment process.
Background
The pig farm waste water belongs to high-concentration organic waste water, and is one of the main 'abominant' causing rural water environment pollution due to the high-concentration ammonia nitrogen, soluble phosphorus and COD substances. Anaerobic fermentation is a necessary and preferred process in the course of its treatment, and only methane gas is obtained in the current anaerobic process. Methane is the main component of natural gas and methane, a large amount of methane in a pig farm is directly discharged into the atmosphere, and the greenhouse effect generated by methane is more than 20 times larger than that of carbon dioxide. With the progress of science and technology, the phenomenon of hydrogen production in the anaerobic process is more and more emphasized, the product of hydrogen combustion is water, the greenhouse effect is not generated, the hydrogen is the cleanest and most efficient energy, the heat value of the hydrogen is 143.35 kJ/g, which is 2.6 times of methane, so that the hydrogen production has great superiority compared with the methane production during the pig farm wastewater treatment, and the hydrogen production has very important practical significance for solving the problems of carbon emission and environmental pollution caused by the breeding industry.
But the current piggery wastewater anaerobic process only produces methane. The utility model discloses a "a wastewater treatment system of raising pigs" (application number 2012206386350) has explored the anaerobism/good oxygen processing technology after waste water nitrogen phosphorus retrieves, but has not explored the hydrogen technique of anaerobism, more does not have to waste water further cyclic recycling, so about the pig farm waste water hydrogen and the technique and the technology research and development of handling the back retrieval and utilization lack very much. In addition, the invention patent 'a method for culturing high-temperature anaerobic hydrogen-producing granular sludge' (application number 200410088598.0) applies a mode of heating sludge to carry out anaerobic hydrogen production, but does not explore hydrogen production efficiency, a gas purification technology and a subsequent treatment process, does not purify the produced hydrogen, and cannot obtain high-quality hydrogen. In the process of anaerobic hydrogen production, about 30-50% CO is produced2And also small amounts of H2S、NO2And the like, so the purification of the gas after anaerobic hydrogen production is very important, and the purification mode has great influence on the treatment cost. After the high-purity hydrogen is obtained by the method, the carbon dioxide absorption liquid is designed and utilized, and the carbon emission is reduced by more than 80%.
The process design reduces the hydraulic retention time of the aerobic biochemical pool from more than 8-12 hours to less than 4-6 hours, obviously improves the treatment efficiency and reduces the aerobic treatment cost by about more than 30%. In addition, a chemical feeding pipe is arranged at the water inlet of the mixing sedimentation tank, the medicament is uniformly mixed by utilizing the action of hydraulic turbulence to remove soluble phosphorus in water, and then the wastewater is recycled by further adopting a disinfection technology, so that 90% of water is saved in a pig farm. Has very important significance for the wastewater treatment of the large-scale pig farm. Therefore, the method finally realizes the pig farm wastewater anaerobic hydrogen production treatment mode, and provides a new way for the development of biomass clean energy in the pig industry.
Disclosure of Invention
The utility model aims at providing a pig farm waste water anaerobism is produced hydrogen and is circulated retrieval and utilization processing apparatus, and the device is produced hydrogen efficiently, can realize the purpose of pig farm waste water conversion living beings clean energy.
The utility model provides a pig farm waste water anaerobism is produced hydrogen and circulation retrieval and utilization processing apparatus, including the grid canal, the MAP sedimentation tank, the waste water equalizing basin, anaerobism hydrogen production ware, the absorption tower, good oxygen biochemical pond, mix sedimentation tank and disinfection pond, install the grid in the grid canal, the delivery port of grid canal connects the water inlet of MAP sedimentation tank, MAP sedimentation tank bottom deposit export connects deposit recovery unit through first valve, the delivery port on MAP sedimentation tank upper portion connects the water inlet of waste water equalizing basin through first play water pump, the delivery port of waste water equalizing basin connects the water inlet of anaerobism hydrogen production ware through second play water pump, the gas outlet on anaerobism hydrogen production ware top connects the absorption tower through first pipeline, gaseous booster pump, the hydrogen outlet at absorption tower top connects the air inlet of air pocket through the second pipeline, the delivery port on anaerobism hydrogen production ware upper portion connects good oxygen pond through third play water pump, the water outlet at the bottom of the absorption tower is connected with an aerobic biochemical pool through a fourth water outlet pump, the water outlet of the aerobic biochemical pool is connected with the water inlet of a mixed sedimentation pool through a fifth water outlet pump, one path of a precipitated sludge outlet at the bottom of the mixed sedimentation pool is connected with the aerobic biochemical pool through a third pipeline and then respectively through a second valve, the aerobic biochemical pool is connected with an anaerobic hydrogen production reactor through the third valve, the other path of the precipitated sludge outlet is connected with a discharge pipe through a sludge discharge valve, the water outlet of the mixed sedimentation pool is connected with the water inlet of a disinfection pool through a sixth water outlet pump, one path of the water outlet at the top of the disinfection pool is connected with a water distribution pipe in the absorption tower through.
In the above, the MAP sedimentation tank is provided with a magnesium salt adding pipe, a phosphate salt adding pipe and a first stirrer.
In the above, install first pH value monitoring probe, second agitator and acidification pipe in the waste water equalizing basin.
In the above, the anaerobic hydrogen production reactor is provided with a third stirrer.
In the above, the absorption tower is internally provided with a filler, a gas distribution pipe, a second pH value monitoring probe and a water distribution pipe, the top of the absorption tower is provided with an alkali adding pipe, wherein the gas distribution pipe is positioned below the filler, the water distribution pipe is positioned above the filler, the gas distribution pipe is connected with a first pipeline behind a gas booster pump, and the alkali adding pipe is provided with an alkali liquid valve.
In the above, a chemical feeding pipe is arranged at the water inlet of the mixing sedimentation tank.
In the above, the bottom of the disinfection tank 42 is provided with O3A valve, and a UV disinfection lamp is arranged in the tank.
The utility model discloses following positive effect has:
1. the utility model provides a device for producing clean energy hydrogen by piggery wastewater anaerobic. After active sludge in an anaerobic hydrogen production reactor is subjected to strain separation to obtain hydrogen production dominant strains MH-1 and MH-2, the MH-1 and MH-2 are subjected to enrichment culture at the pH value of 5.0 by using sterilized pig farm wastewater containing 0.5% of glycerin under strict anaerobic conditions, then a culture solution is inoculated to an original hydrogen production reactor, and the pH value of inlet water is adjusted to 3.5-4.0, so that the hydrogen production efficiency of the reactor is improved by more than 90%. The anaerobic process of the wastewater is controlled to be four stages of hydrolysis, acidification, acid production and hydrogen production, the traditional anaerobic methane production mode is changed, the aim of converting the wastewater of a pig farm into biomass clean energy is achieved, and a new way is provided for the development of biomass energy in the pig industry.
2. Part of circulating water is added into alkali liquor and then is used as absorption liquid in an absorption tower for removing CO generated by a hydrogen production reactor2、H2S and the like, high-quality hydrogen is obtained, the purity of the hydrogen is about 90 percent, and therefore the hydrogen can be used as an industrial raw material or a fuel, and the wastewater treatment cost is reduced. In addition, the absorption liquid is discharged into the aerobic biochemical pool for treatment, so that on one hand, carbon dioxide generated in the anaerobic process of the wastewater is utilized as a carbon source by autotrophic bacteria such as nitrifying bacteria and the like in the aerobic treatment process, and on the other hand, the alkalinity required by the nitrification reaction of ammonia nitrogen in the aerobic biochemical pool is supplemented, and the method can effectively reduce the carbon emission of the large-scale pig farm by more than 80 percent and has very important significance on the carbon emission reduction of the aquaculture.
3. The anaerobic hydrogen production can degrade COD to a small molecular organic acid stage, provide a high-quality carbon source for aerobic heterotrophic bacteria treatment, and greatly improve the C/N ratio of the aerobic treatment, so that the hydraulic retention time of the aerobic section is prolongedThe time is reduced from 8 to 12 hours to less than 4 to 6 hours, the treatment efficiency is obviously improved, and the aerobic treatment cost is reduced by more than 30 percent. The utility model discloses realize that pig farm waste water anaerobism produces hydrogen and NH4 +-N、PO4 3+The technical goals of recycling and wastewater recycling are realized, and the clean production concept of 'carbon emission reduction' and the recycling economy of the pig industry are realized.
Drawings
Fig. 1 is a process flow diagram of the present invention.
In the figure, 1-grid channel, 2-grid, 3-MAP sedimentation tank, 4-magnesium salt pipe, 5-first stirrer, 6-phosphate salt pipe, 7-first valve, 8-sedimentation recovery device, 9-fourth valve, 10-first water outlet pump, 11-wastewater adjusting tank, 12-first pH value monitoring probe, 13-second stirrer, 14-acidification pipe, 15-second water outlet pump, 16-anaerobic hydrogen production reactor, 17-first pipeline, 18-gas booster pump, 19-third stirrer, 20-absorption tower, 21-gas distribution pipe, 22-filler, 23-second pH value monitoring probe, 24-alkali adding pipe, 25-alkali liquid valve, 26-second pipeline, 27-gas collecting bag, 28-a third water outlet pump, 29-a discharge pipe, 30-an aerobic biochemical tank, 31-a water distribution pipe, 32-a fourth water outlet pump, 33-a fourth pipeline, 34-a fifth water outlet pump, 35-a mixed sedimentation tank, 36-a medicine feeding pipe, 37-a mud valve, 38-a third pipeline, 39-a second valve, 40-a third valve, 41-a sixth water outlet pump, 42-a disinfection tank, 43-O3Valve, 44-UV sterilizing lamp.
Detailed Description
As shown in figure 1, the utility model provides a pair of pig farm waste water anaerobism is produced hydrogen and circulation retrieval and utilization processing apparatus, the device includes grid canal 1, MAP sedimentation tank 3, waste water equalizing basin 11, anaerobism hydrogen production reactor 16, absorption tower 20, good oxygen biochemical pond 30, mix sedimentation tank 35 and disinfection pond 42, installation grid 2 in the grid canal 1, grid canal 1's delivery port connects the water inlet of MAP sedimentation tank 3, be provided with in the MAP sedimentation tank 3 with magnesium salt pipe 4, with phosphorus salt pipe 6 and first agitator 5, 3 bottom sediment outlets of MAP sedimentation tank connect sediment recovery unit 8 through first valve 7, the delivery port on 3 upper portions of MAP sedimentation tank connects the water inlet of waste water equalizing basin 11 through first play water pump 10.
A first pH value monitoring probe 12, a second stirrer 13 and an acidification pipe 14 are installed in a wastewater adjusting tank 11, a water outlet of the wastewater adjusting tank 11 is connected with a water inlet of an anaerobic hydrogen production reactor 16 through a second water outlet pump 15, the anaerobic hydrogen production reactor 16 is provided with a third stirrer 19, and a gas outlet at the top end of the anaerobic hydrogen production reactor 16 is connected with an absorption tower 20 through a first pipeline 17 and a gas booster pump 18.
The absorption tower 20 is internally provided with a filler 22, an air distribution pipe 21, a second pH value monitoring probe 23 and a water distribution pipe 31, the top of the absorption tower 20 is provided with an alkali adding pipe 24, wherein the air distribution pipe 21 is positioned below the filler 22, the water distribution pipe 31 is positioned above the filler 22, the air distribution pipe 21 is connected with a first pipeline 17 behind a gas booster pump 18, the alkali adding pipe 24 is provided with an alkali liquor valve 25, and a hydrogen outlet at the top of the absorption tower 20 is connected with an air inlet of an air collecting bag 27 through a second pipeline 26.
The water outlet at the upper part of the anaerobic hydrogen production reactor 16 is connected with an aerobic biochemical pool 30 through a third water outlet pump 28, the water outlet at the bottom of the absorption tower 20 is connected with the aerobic biochemical pool 30 through a fourth water outlet pump 32, the water outlet of the aerobic biochemical pool 30 is connected with the water inlet of a mixed sedimentation pool 35 through a fifth water outlet pump 34, and a chemical feeding pipe 36 is arranged at the water inlet of the mixed sedimentation pool 35.
One path of a precipitated sludge outlet at the bottom of the mixed sedimentation tank 35 is connected with the aerobic biochemical tank 30 through a third pipeline 38 and then respectively through a second valve 39, is connected with the anaerobic hydrogen production reactor 16 through a third valve 40, the other path is connected with a discharge pipe through a sludge discharge valve 37, and a water outlet of the mixed sedimentation tank 35 is connected with a water inlet of a disinfection tank 42 through a sixth water outlet pump 41.
The bottom of the disinfection tank 42 is provided with an O3A valve 43, a UV disinfection lamp 44 is arranged in the tank, one path of the water outlet at the top of the disinfection tank 42 is connected with the water distribution pipe 31 in the absorption tower 20 through a fourth valve 9 and a fourth pipeline 33, and the other path is connected with the discharge pipe 29.
As shown in figure 1, after the pigsty is washed, the wastewater is collected to a grid channel 1 through a drainage ditch and a sewage pipeline, the wastewater is subjected to flow into an MAP sedimentation tank 3 automatically after granular impurities such as floating or large feed and excrement are removed through a grid 2, and the pigsty is subjected to a dry excrement cleaning mode.
After the wastewater enters the MAP sedimentation tank 3, after the water inlet amount reaches half of the tank volume, the first stirrer 5 is started, and the rotating speed is controlled to be 150 plus 350 rpm. According toAdding magnesium salt and phosphorus salt into the wastewater through a magnesium salt adding pipe 4 and a phosphorus salt adding pipe 6, adjusting the rotating speed of the first stirrer 5 to be two thirds of the original rotating speed after water inlet and medicine adding are finished, and continuing stirring for 10-15 min. The magnesium salt is chemically pure, analytically pure or industrially useful MgCl2、MgSO4And one of MgO, which is prepared into saturated solution before being added, and the phosphorus salt is NaH which is chemically pure, analytically pure or industrially used2PO4、Na2HPO4、Na3PO4、KH2PO4、K2HPO4And H3PO4One of the two is prepared into saturated solution before adding, the adding amount of the magnesium salt solution and the phosphorus salt solution is controlled to be 1.0-1.3:1 in molar ratio of magnesium salt to phosphorus salt, and the amount of the phosphorus salt is controlled to be equal to NH in the pig farm wastewater4 +The molar ratio of-N is 0.6-0.8: 1. The solvent water for preparing the saturated solution of magnesium salt and phosphorus salt comes from the top of the disinfection tank 42, so that the consumption of fresh water is saved, and the total amount of discharged wastewater is reduced.
And (3) enabling precipitates generated after the chemical reaction in the MAP sedimentation tank 3 to enter a sedimentation recovery device 8 through a first valve 7 at the bottom to obtain nitrogen and phosphorus sediments, and utilizing the nitrogen and phosphorus sediments as slow release fertilizers. The MAP recovery device 8 can adopt Chinese patent 'a device for recycling struvite from wastewater nitrogen and phosphorus' (application number 201420458242.0), the sediment generated by the MAP reaction sedimentation tank 3 is white, after dehydration and drying by the MAP recovery device 8, the content of magnesium ammonium phosphate is higher than 85 percent, and the magnesium ammonium phosphate can be recovered as high-quality chemical raw materials or agricultural slow-release fertilizers, thereby realizing the circular economy concept of the aquaculture industry.
The supernatant of the MAP sedimentation tank 3 enters a wastewater adjusting tank 11 through a first water outlet pump 10, the pH value of the wastewater is adjusted to 3.5-4.0 through an acid adding pipe 14 under the stirring of a second stirrer 13, the acid used for adjusting the pH value of the wastewater is hydrochloric acid, and the acid enters an anaerobic hydrogen production reactor 16 through a second water outlet pump 15.
The anaerobic hydrogen production reactor 16 takes residual activated sludge of a sewage plant as a filler, and is firstly heated at 70 ℃ for 0.5h and then added into the anaerobic hydrogen production reactor 16, so that methane bacteria are killed, the sludge VSS is 6-8g/L, and the volume ratio of mud to water is 1: 2.5-4.5. Stirring for 20min by a third stirrer 19 every 1 hour after water is fed,the operation period comprises the following steps when the hydraulic retention time is 12 h: water is fed for 0.5h, reaction is carried out for 10h, precipitation is carried out for 1h, water is discharged for 0.5h, and water is fed again after water discharge. After the operation is carried out for 30 days in the way, the sterilized pig farm wastewater is used as a culture medium, and hydrogen production dominant bacteria species are separated from the anaerobic activated sludge in the anaerobic hydrogen production reactor 16 under strict anaerobic conditions to obtain hydrogen production dominant bacteria species MH-1 and MH-2. Performing enrichment culture of MH-1 and MH-2 at pH 5.0 with sterilized pig farm wastewater containing 0.5% glycerol under strict anaerobic condition, wherein each ml of enrichment culture solution contains 1 × 1017-1025After MH-1 and MH-2 are added, the mixture and anaerobic sludge in the anaerobic hydrogen production reactor 16 are added into the anaerobic hydrogen production reactor 16 again according to the volume ratio of 1:1 of muddy water. After mixing with anaerobic sludge, no water is fed within 48 hours, stirring is carried out at intervals of 1 hour, the reactor is kept stand after 48 hours, and supernatant is discharged. Then, feeding the wastewater into the pig farm according to the volume ratio of the muddy water to the waste water of 1:1.5, repeating the operation, and discharging supernatant after 48 hours; repeating for 4-6 times, and increasing the water inlet volume ratio to 1: 2.5; the process mode improves the hydrogen production efficiency of the reactor by more than 40 percent.
The conical part at the top end of the anaerobic hydrogen production reactor 16 is a gas collection chamber, hydrogen and carbon dioxide gas generated by the anaerobic hydrogen production reactor 16 uniformly enter the absorption tower 20 from a gas distribution pipe 21 at the bottom of the absorption tower 20 through a first pipeline 17 and a gas booster pump 18, the pH value of liquid entering the absorption tower from a water distribution pipe 31 is adjusted to be more than 8.5 through an alkali adding pipe 24 and an alkali liquor valve 25 so as to absorb the carbon dioxide in the gas, and effluent at the bottom of the absorption tower 20 is sent to an aerobic biochemical pool 30 through a fourth water outlet pump 32. Carbon dioxide generated in the anaerobic process is used as a carbon source of nitrifying bacteria in the aerobic treatment stage, and simultaneously, the alkalinity required by the ammonia nitrogen nitration reaction in the aerobic tank 30 is supplemented, so that the carbon emission of the large-scale pig farm can be effectively reduced by more than 80%. The purified hydrogen gas enters a gas collecting bag 27 through a second pipe 26 at the top of the absorption tower 20.
The effluent of the anaerobic hydrogen production reactor 16 enters an aerobic biochemical pool 30 of an aerobic biochemical pool 30 through a third water outlet pump 28, the activated sludge MLSS in the aerobic biochemical pool 30 is 3000-7000mg/L, and the hydraulic retention time is 4-6 h. The effluent of the aerobic biochemical tank 30 enters a mixing sedimentation tank 35 through a fifth effluent pump 34, a phosphorus removing agent is added through a dosing pipe 36, and the phosphorus removing agent is uniformly mixed by utilizing the hydraulic self-turbulence effect to remove soluble phosphorus in the water. The dephosphorizing agent adopts saturated solution of aluminum sulfate, aluminum trichloride or ferric trichloride, and the hydraulic retention time of the mixed settling tank is 2-3 h.
The sludge settled at the bottom of the mixed sedimentation tank 35 returns to the aerobic biochemical tank 30 through the sludge discharge valve 37, the third pipeline 38 and the second valve 39, and returns to the anaerobic hydrogen production reactor 16 through the sludge discharge valve 37, the third pipeline 38 and the third valve 40, so that the discharge amount of the residual activated sludge can be reduced. The effluent of the mixing sedimentation tank 35 enters a disinfection tank 42 through a sixth effluent pump 41, and the bottom of the disinfection tank 42 is provided with O3Valve 43, UV disinfection lamp 44 arranged in the tank, with O3And sterilizing by cooperating with ultraviolet rays, wherein a part of the effluent at the top of the sterilizing tank 42 is discharged for later use through the discharge pipe 29, and a part of the effluent enters the water distribution pipe 31 through the fourth valve 9 and the fourth pipeline 33 for recycling.
Application example one:
3000 large-scale piggery wastewater in a certain city in Guangdong province is taken as an implementation object, a piggery is implemented in a dry manure cleaning mode, and the COD (chemical oxygen demand) of the wastewater for flushing the piggery is 1470mg/L and the ammonia nitrogen is 270 mg/L. The wastewater is gathered to a grid channel 1 through a drainage ditch and a sewage pipeline, the floating feed, excrement and other granular impurities are removed through a grid 2, the wastewater enters an MAP sedimentation tank 3, after the water inlet amount reaches half of the tank volume, a first stirrer 5 is started, and the rotating speed is controlled to be 210 rpm.
In the MAP precipitation tank 3, industrial MgCl is respectively added through a magnesium salt adding pipe 4 and a phosphate salt adding pipe 62And Na3PO4The saturated solution, the solvent water for preparing the saturated solution of magnesium salt and phosphorus salt comes from the top of the disinfection tank 42 to discharge water, thus saving the consumption of fresh water and reducing the total amount of discharged wastewater. According to the total amount of the wastewater, NH in the medicament and the wastewater of the pig farm is controlled4 +The molar ratio of N to P to Mg is 1:0.8:0.8, the rotation speed of the first stirrer 5 is adjusted to 140rpm after water feeding and medicine adding are finished, and stirring is continued for 15 min. The MAP reaction settling tank 3 is operated intermittently. The precipitate that produces after the chemical reaction is finished is white, gets into sediment recovery unit 8 through first valve 7 in bottom, and MAP recovery unit 8 adopts chinese patent "one kind carries out guanite resource recovery to waste water nitrogen phosphorusDevice (application No. 201420458242.0), dewatering and drying to obtain MAP precipitate with magnesium ammonium phosphate content higher than 85%.
The supernatant of the MAP sedimentation tank 3 enters a wastewater adjusting tank 11 through a first water outlet pump 10, and enters an anaerobic hydrogen production reactor 16 through a second water outlet pump 15 after the pH value of the wastewater is adjusted to 4.0 by adding hydrochloric acid through an acid adding pipe 14 under the stirring of a second stirrer 13. The anaerobic hydrogen production reactor 16 takes residual activated sludge of a sewage plant of a petrochemical enterprise as a filler, the residual activated sludge is heated at 70 ℃ for 0.5h and then is added into the anaerobic hydrogen production reactor 16, the inoculated sludge VSS is 6.3g/L, the volume ratio of the sludge to the water is 1:2.9, the anaerobic hydrogen production reactor 16 is stirred by a third stirrer 19 for 20min every 1h after water enters, the hydraulic retention time is 12h, and the operation period comprises: water is fed for 0.5h, reaction is carried out for 10h, precipitation is carried out for 1h, water is discharged for 0.5h, and water is fed again after water discharge. After the operation is carried out for 30 days in the way, the sterilized pig farm wastewater is used as a culture medium, and hydrogen production dominant bacteria species are separated from the anaerobic activated sludge in the anaerobic hydrogen production reactor 16 under strict anaerobic conditions to obtain hydrogen production dominant bacteria species MH-1 and MH-2. Performing enrichment culture of MH-1 and MH-2 at pH 5.0 with sterilized pig farm wastewater containing 0.5% glycerol under strict anaerobic condition, wherein each ml of enrichment culture solution contains 1 × 1017-1025After MH-1 and MH-2 are added, the mixture and anaerobic sludge in the anaerobic hydrogen production reactor 16 are added into the anaerobic hydrogen production reactor 16 again according to the volume ratio of 1:1 of muddy water. After mixing with anaerobic sludge, no water is fed within 48 hours, stirring is carried out at intervals of 1 hour, the reactor is kept stand after 48 hours, and supernatant is discharged. Then, feeding the wastewater into the pig farm according to the volume ratio of the muddy water to the waste water of 1:1.5, repeating the operation, and discharging supernatant after 48 hours; repeating the steps for 4 times, increasing the volume ratio of the water inlet to be 1:2, stirring every 1 hour, standing the reactor after 48 hours, and discharging the supernatant. Repeating the steps for 4 times, increasing the volume ratio of the water inlet to be 1:2.5, stirring every 1 hour, standing the reactor after 48 hours, and discharging the supernatant. Gas generated by the anaerobic hydrogen generating reactor 16 enters the absorption tower 20 through the first pipeline 17, the gas booster pump 18 and the gas distribution pipe 21, and then NaOH saturated solution is added through the alkali adding pipe 24 and the alkali liquor valve 25 to adjust the pH value of liquid entering the tower from the water distribution pipe 31 to 9, so that the hydrogen concentration is 93%. The quality of anaerobic effluent is COD 620.3mg/L and ammonia nitrogen131 mg/L and soluble phosphorus 23.1 mg/L.
The effluent of the anaerobic hydrogen production reactor 16 enters an aerobic biochemical pool 30 through a third effluent pump 28 and a carbon dioxide absorption liquid at the bottom of the absorption tower 20 through a fourth effluent pump 32, the activated sludge MLSS is 3400mg/L, and the hydraulic retention time is 4 hours. The pH value of the effluent is 6.5, the COD52.3mg/L, the ammonia nitrogen is 7.1 mg/L, and the soluble phosphorus is 16.3 mg/L. The effluent of the aerobic biochemical tank 30 enters a mixed sedimentation tank 35 through a fifth effluent pump 34, industrial aluminum sulfate saturated solution is added through a dosing pipe 36 to remove soluble phosphorus in the water, and the hydraulic retention time of the mixed sedimentation tank 35 is 2.5 hours. The sludge settled at the bottom of the mixed settling tank 35 returns to the aerobic biochemical tank 30 through a sludge discharge valve 37, a third pipeline 38 and a second valve 39, and returns to the anaerobic hydrogen production reactor 16 through the sludge discharge valve 37, the third pipeline 38 and a third valve 40. The effluent of the mixing sedimentation tank 35 enters a disinfection tank 42 through a sixth effluent pump 41, and O arranged at the bottom of the disinfection tank 42 is utilized3 Valve 43 and in-tank UV sterilizing lamp 44 to produce O3And ultraviolet rays are matched for disinfection and sterilization, part of effluent at the top of the disinfection tank 42 is recycled for standby through a discharge pipe 29 and another valve and is used as solvent water for preparing saturated solution of magnesium salt and phosphorus salt and solvent water for preparing saturated solution of aluminum sulfate, and part of effluent is directly recycled as absorption liquid through a fourth valve 9, a fourth pipeline 33 and a water distribution pipe 31. The effluent quality is COD33.0mg/L, ammonia nitrogen 3.5 mg/L, and soluble phosphorus 0.6 mg/L.
Application example two:
1000 large-scale piggery wastewater in a certain city in Guangdong province is taken as an implementation object, a piggery is implemented in a dry manure cleaning mode, the wastewater for washing the piggery is collected to a grating channel 1 through a drainage ditch and a sewage pipeline, granular impurities such as floating or large feed, excrement and the like are removed through a grating 2, the wastewater enters an MAP sedimentation tank 3, after the water inlet amount reaches half of the tank volume, a first stirrer 5 is started, the rotating speed is controlled to be 300rpm, and the wastewater quality is COD1501mg/L, ammonia nitrogen 243 mg/L and soluble phosphorus 63 mg/L.
In the MAP precipitation tank 3, industrial MgCl is respectively added through a magnesium salt adding pipe 4 and a phosphate salt adding pipe 62And Na3PO4Saturated solution, solvent water for preparing saturated solution of magnesium salt and phosphorus salt comes from the top of the disinfection tank 42, and the saturated solution is obtainedThe consumption of fresh water is saved, and the total amount of wastewater discharge is reduced. According to the total amount of the wastewater, NH in the medicament and the wastewater of the pig farm is controlled4 +The molar ratio of N to P to Mg is 1:0.8:0.8, the rotation speed of the first stirrer 5 is adjusted to 200rpm after water feeding and medicine adding are finished, and stirring is continued for 10 min. The MAP reaction settling tank 3 is operated intermittently. The precipitate produced after the chemical reaction is white and enters a precipitation recovery device 8 through a first valve 7 at the bottom, the MAP recovery device 8 adopts a Chinese patent 'a device for recycling struvite from nitrogen and phosphorus in wastewater' (application number 201420458242.0), and the MAP precipitate 9 is obtained after dehydration and drying, and the content of magnesium ammonium phosphate is higher than 87%.
And the supernatant of the MAP sedimentation tank 3 enters a wastewater adjusting tank 11 through a first water outlet pump 10, and enters an anaerobic hydrogen production reactor 16 through a second water outlet pump 15 after the pH value of the wastewater is adjusted to 3.5 by adding hydrochloric acid through an acid adding pipe 14 under the stirring of a second stirrer 13. The anaerobic hydrogen production reactor 16 takes residual activated sludge of a sewage plant of a petrochemical enterprise as a filler, the residual activated sludge is heated for 0.5h at 70 ℃, then the residual activated sludge is added into the reactor, methane bacteria are killed, hydrogen production microorganisms are obtained, the sludge VSS is inoculated to be 6.51g/L, the volume ratio of sludge to water is 1:2.8-3.0, the anaerobic hydrogen production reactor 16 is stirred for 20min by a third stirrer 19 every 1 hour after water enters, the hydraulic retention time is 12h, and the operation period comprises the following steps: water is fed for 0.5h, reaction is carried out for 10h, precipitation is carried out for 1h, water is discharged for 0.5h, and water is fed again after water discharge. After the operation is carried out for 30 days in the way, the sterilized pig farm wastewater is used as a culture medium, and hydrogen production dominant bacteria species are separated from the anaerobic activated sludge in the anaerobic hydrogen production reactor 16 under strict anaerobic conditions to obtain hydrogen production dominant bacteria species MH-1 and MH-2. Performing enrichment culture of MH-1 and MH-2 at pH 5.0 with sterilized pig farm wastewater containing 0.5% glycerol under strict anaerobic condition, wherein each ml of enrichment culture solution contains 1 × 1017-1020After MH-1 and MH-2 are added, the mixture and anaerobic sludge in the anaerobic hydrogen production reactor 16 are added into the reactor 16 again according to the volume ratio of 1:1 of muddy water. After mixing with anaerobic sludge, no water is fed within 48 hours, stirring is carried out at intervals of 1 hour, the reactor is kept stand after 48 hours, and supernatant is discharged. Then, feeding the wastewater into the pig farm according to the volume ratio of the muddy water to the waste water of 1:1.5, repeating the operation, and discharging supernatant after 48 hours; after the process is repeated for 4 times, the process is repeated,the volume ratio of the inlet water is increased to 1:2, stirring is carried out every 1 hour, the reactor is kept stand after 48 hours, and the supernatant is discharged. Repeating the steps for 4 times, increasing the volume ratio of the water inlet to be 1:2.5, stirring every 1 hour, standing the reactor after 48 hours, and discharging the supernatant. Gas generated by the anaerobic hydrogen generating reactor 16 enters the absorption tower 20 through the first pipeline 17, the gas booster pump 18 and the gas distribution pipe 21, and then NaOH saturated solution is added through the alkali adding pipe 24 and the alkali liquor valve 25 to adjust the pH value of liquid entering the tower from the water distribution pipe 31 to be 9, so that the concentration of the obtained hydrogen is 90%. The water quality of the effluent of the anaerobic hydrogen production reactor 16 is COD770mg/L, ammonia nitrogen 125 mg/L and soluble phosphorus 27 mg/L.
The effluent of the anaerobic hydrogen production reactor 16 enters an aerobic biochemical pool 30 through a third effluent pump 28 and the effluent at the bottom of the absorption tower 20 through a fourth effluent pump 32, the MLSS of the activated sludge is 3400mg/L, and the hydraulic retention time is 4 hours. The pH value of effluent is 6.3, the COD43.8mg/L, the ammonia nitrogen is 5.2 mg/L, and the soluble phosphorus is 18.3 mg/L. The effluent of the aerobic biochemical tank 30 enters a mixed sedimentation tank 35 through a fifth effluent pump 34, and industrial aluminum sulfate saturated solution is added through a dosing pipe 36 on the mixed sedimentation tank 35 to remove soluble phosphorus in the water. The hydraulic retention time of the mixed sedimentation tank 35 is 2.5h, the settled sludge at the bottom of the mixed sedimentation tank 35 flows back to the aerobic biochemical tank 30 through a sludge discharge valve 37, a third pipeline 38 and a second valve 39, and flows back to the anaerobic hydrogen production reactor 16 through the sludge discharge valve 37, the third pipeline 38 and a third valve 40. The effluent of the mixing sedimentation tank 35 enters a disinfection tank 42 through a sixth effluent pump 41, and O arranged at the bottom of the disinfection tank 42 is utilized3 Valve 43 and in-tank UV sterilizing lamp 44 to produce O3And ultraviolet rays are matched for disinfection and sterilization, part of effluent at the top of the disinfection tank 42 is recycled for standby through a discharge pipe 29 and another valve and is used as solvent water for preparing saturated solution of magnesium salt and phosphorus salt and solvent water for preparing saturated solution of aluminum sulfate, and part of effluent is directly recycled as absorption liquid through a fourth valve 9, a fourth pipeline 33 and a water distribution pipe 31. The effluent quality is COD28.2mg/L, ammonia nitrogen 3.1 mg/L, and soluble phosphorus 0.7 mg/L.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A pig farm wastewater anaerobic hydrogen production and recycling treatment device is characterized by comprising a grid channel, an MAP sedimentation tank, a wastewater adjusting tank, an anaerobic hydrogen production reactor, an absorption tower, an aerobic biochemical tank, a mixed sedimentation tank and a disinfection tank, wherein a grid is arranged in the grid channel, a water outlet of the grid channel is connected with a water inlet of the MAP sedimentation tank, a sediment outlet at the bottom of the MAP sedimentation tank is connected with a sediment recovery device through a first valve, a water outlet at the upper part of the MAP sedimentation tank is connected with a water inlet of the wastewater adjusting tank through a first water outlet pump, a water outlet of the wastewater adjusting tank is connected with a water inlet of the anaerobic hydrogen production reactor through a second water outlet pump, a gas outlet at the top end of the anaerobic hydrogen production reactor is connected with the absorption tower through a first pipeline and a gas booster pump, a hydrogen outlet at the top of the absorption tower is connected with a gas inlet of a gas collecting bag through a second, the water outlet at the bottom of the absorption tower is connected with an aerobic biochemical pool through a fourth water outlet pump, the water outlet of the aerobic biochemical pool is connected with the water inlet of a mixed sedimentation pool through a fifth water outlet pump, one path of a precipitated sludge outlet at the bottom of the mixed sedimentation pool is connected with the aerobic biochemical pool through a third pipeline and then respectively through a second valve, the aerobic biochemical pool is connected with an anaerobic hydrogen production reactor through the third valve, the other path of the precipitated sludge outlet is connected with a discharge pipe through a sludge discharge valve, the water outlet of the mixed sedimentation pool is connected with the water inlet of a disinfection pool through a sixth water outlet pump, one path of the water outlet at the top of the disinfection pool is connected with a water distribution pipe in the absorption tower through.
2. The device for the anaerobic hydrogen production and recycling treatment of the wastewater in the pig farm according to claim 1, wherein the MAP sedimentation tank is provided with a magnesium salt adding pipe, a phosphate salt adding pipe and a first stirrer.
3. The device for producing hydrogen by anaerobic fermentation and recycling the wastewater in the pig farm according to claim 1, wherein a first pH value monitoring probe, a second stirrer and an acid adding pipe are arranged in the wastewater adjusting tank.
4. The device for treating the wastewater in the pig farm by anaerobic hydrogen production and recycling according to claim 1, wherein the anaerobic hydrogen production reactor is provided with a third stirrer.
5. The device for producing hydrogen from pig farm wastewater by anaerobic fermentation and recycling the wastewater as claimed in claim 1, wherein the absorption tower is internally provided with a filler, a gas distribution pipe, a second pH value monitoring probe and a water distribution pipe, the top of the absorption tower is provided with an alkali adding pipe, the gas distribution pipe is positioned below the filler, the water distribution pipe is positioned above the filler, the gas distribution pipe is connected with a first pipeline behind a gas booster pump, and the alkali adding pipe is provided with an alkali liquid valve.
6. The device for the treatment of the wastewater in the pig farm for the production of hydrogen by anaerobic fermentation and the recycling of the wastewater according to claim 1, wherein a chemical feeding pipe is arranged at a water inlet of the mixing sedimentation tank.
7. The device for the anaerobic hydrogen production and recycling treatment of the wastewater in the pig farm according to claim 1, wherein O is arranged at the bottom of the disinfection tank3A valve, and a UV disinfection lamp is arranged in the tank.
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