Biochemical carbon source preparation device for biogas slurry and leachate treatment

Abstract

The utility model provides a biochemical carbon source preparation device for biogas slurry and leachate treatment, which comprises a reactor, a primary solid-liquid separator, a secondary solid-liquid separator, a sludge tank, a horizontal centrifuge, an intermediate reflux water tank, a medium-temperature ultrafiltration system and a water production tank, the intermediate reflux water tank is used for storing a liquid phase separated by the secondary solid-liquid separator and the horizontal centrifuge, the medium-temperature ultrafiltration system is used for performing final solid-liquid separation on the mixed liquid, one part of concentrated liquid generated by the medium-temperature ultrafiltration system flows back into the reactor, and the rest of concentrated liquid flows back into the intermediate reflux water tank. The biochemical carbon source preparation device disclosed by the utility model can be used for converting kitchen waste / kitchen waste organic slurry into a high-quality biochemical carbon source to replace a traditional industrial carbon source, so that the operation cost is greatly reduced, insufficient carbon sources in a sewage treatment system are effectively supplemented, the growth environment of microorganisms is optimized, and stable and up-to-standard discharge of effluent is ensured; and the method has remarkable economic and environmental benefits.

Description

Technical Field

[0001] This utility model relates to the field of biogas slurry and leachate treatment technology, and in particular to a biochemical carbon source preparation device for biogas slurry and leachate treatment. Background Technology

[0002] In small and medium-sized food waste / kitchen waste treatment plants, the treatment of biogas slurry after anaerobic fermentation of organic slurry faces numerous challenges, such as low biogas production, high investment in biogas slurry treatment systems, and high operating costs. Meanwhile, leachate from mid-to-late-stage sanitary landfills lacks sufficient organic matter and has a low COD / TN ratio, resulting in poor biochemical treatment effectiveness. Traditional treatment methods require the addition of large amounts of industrial carbon sources (such as sodium acetate and glucose), which is not only costly but also prone to glucose inhibition, leading to low carbon source utilization, high sludge production, and high reagent costs.

[0003] To address the aforementioned issues, this invention proposes a novel biochemical carbon source preparation device. This device utilizes organic slurry from kitchen waste / food scraps for deep, directional fermentation to prepare biochemical carbon sources. Under the comprehensive control of intelligent operating parameters, the directional fermentation of the organic slurry is achieved, converting it into easily degradable organic acids such as acetic acid and butyric acid. This completely replaces traditional industrial carbon sources, reduces operating costs, and improves wastewater treatment efficiency. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a biochemical carbon source preparation device for treating biogas slurry and leachate, which solves the problems of high cost, low utilization rate and large amount of sludge production in the prior art for industrial carbon source treatment of biogas slurry and leachate.

[0005] To achieve the above and other related objectives, this utility model provides a biochemical carbon source preparation device for treating biogas slurry and leachate, comprising the following components:

[0006] A reactor for directional fermentation of a bio-carbon source, wherein the reactor is connected to a secondary solid-liquid separator via a primary solid-liquid separator;

[0007] A sludge tank, one end of which is connected to the sludge outlet of a secondary solid-liquid separator, and the other end of which is connected to a horizontal centrifuge;

[0008] The intermediate reflux tank is used to store the liquid phase separated by the secondary solid-liquid separator and the horizontal centrifuge. The intermediate reflux tank pumps the mixed liquid in it to the medium-temperature ultrafiltration system through the ultrafiltration feed water pump.

[0009] The intermediate temperature ultrafiltration system is used for the final solid-liquid separation of the mixture. The intermediate temperature ultrafiltration system is equipped with an ultrafiltration feed water filter at the front end. A portion of the concentrate produced by the intermediate temperature ultrafiltration system is returned to the reactor through the return pipe, and the remaining concentrate is returned to the intermediate return water tank.

[0010] The product water tank is used to store the product water of the medium-temperature ultrafiltration system, and the biochemical carbon source in the product water tank is transported to the carbon source transfer pump through the carbon source transfer pump.

[0011] In one embodiment of the present invention, the slurry that has completed directional fermentation and produced acid in the reactor is pumped to a primary solid-liquid separator for solid-liquid separation by a reactor discharge pump. The material after primary solid-liquid separation enters a secondary solid-liquid separator for gravity separation. The liquid phase at the top of the secondary solid-liquid separator overflows to the intermediate return water tank through the water outlet pipe.

[0012] In one embodiment of this utility model, a sedimentation inclined plate is provided in the secondary solid-liquid separator, and the inclined plate is set at an angle of 65% to 80%; a sludge hopper is provided at the bottom of the secondary solid-liquid separator, and the outlet of the sludge hopper is connected to the separator sludge discharge pump, through which the sludge is transported to the sludge tank.

[0013] In one embodiment of this utility model, the bottom of the sludge tank is connected to a sludge pump, which transports the sludge from the sludge tank to a horizontal centrifuge for solid-liquid separation. The solid and liquid separated by the horizontal centrifuge are sold to black soldier fly larvae for breeding, and the separated liquid phase is returned to the intermediate return water tank.

[0014] In one embodiment of this utility model, both the sludge tank and the intermediate return water tank are equipped with a stirrer.

[0015] In one embodiment of the present invention, a central stirrer is provided in the middle of the reactor, and a microporous aeration pipe is provided at the bottom of the reactor, the microporous aeration pipe being connected to a blower.

[0016] In one embodiment of this utility model, an online detection instrument is inserted inside the reactor for real-time monitoring of the pH value and dissolved oxygen concentration inside the reactor; the reactor is also provided with an alkali addition pipe, an enhancer addition pipe and a phosphorus removal agent addition pipe that communicate with its inner cavity.

[0017] In one embodiment of the present invention, the reactor further includes a central intelligent controller, which is electrically connected to a central stirrer, a blower, an alkali addition pipe, a strengthening agent addition pipe, a phosphorus removal agent addition pipe, and a prior detection instrument, and is used to control the pH value, dissolved oxygen concentration, total phosphorus concentration, etc. in the reactor.

[0018] In one embodiment of the present invention, a feed pump is provided at the front end of the reactor for pumping organic slurry into the reactor.

[0019] As described above, the biochemical carbon source preparation device for treating biogas slurry and leachate of this invention has the following beneficial effects:

[0020] 1. The biochemical carbon source preparation device of this utility model can convert kitchen waste / food waste organic slurry into high-quality biochemical carbon source, replace traditional industrial carbon source, significantly reduce operating costs, effectively supplement the carbon source deficiency in the sewage treatment system, optimize the microbial growth environment, promote denitrification and phosphorus removal processes, and ensure stable discharge of effluent that meets standards, thus having significant economic and environmental benefits.

[0021] 2. The central intelligent controller can control the operation of the central agitator, blower, alkali addition pipe, enhancer dosing pipe, and phosphorus removal agent dosing pipe based on the monitoring data of the online detection instruments, so as to realize intelligent control of pH, dissolved oxygen, total phosphorus concentration, etc. in the reactor, promote deep and directional fermentation of organic slurry, reduce sludge production, and lower sludge treatment costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the biochemical carbon source preparation device for treating biogas slurry and leachate disclosed in Embodiment 1 of this utility model.

[0023] Figure 2 This is a structural block diagram of the biochemical carbon source preparation device for treating biogas slurry and leachate disclosed in Embodiment 2 of this utility model.

[0024] Component designation explanation

[0025] 101. Feed pump; 102. Reactor; 103. Alkali dosing pipe; 104. Enhancer dosing pipe; 105. Central agitator; 106. Online monitoring instrument; 107. Blower; 108. Reactor discharge pump; 109. Phosphorus removal agent dosing pipe; 110. Primary solid-liquid separator; 111. Secondary solid-liquid separator; 112. Separator sludge discharge pump; 113. Sludge tank; 114. Sludge pump; 115. Horizontal centrifuge; 116. Intermediate return water tank; 117. Ultrafiltration feed water pump; 118. Medium-temperature ultrafiltration system; 119. Product water tank; 220. Carbon source transfer pump; 221. Ultrafiltration feed water filter. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Example 1

[0028] Please see Figure 1This embodiment provides a biochemical carbon source preparation device for treating biogas slurry and leachate, including a reactor 102, a primary solid-liquid separator 110, a secondary solid-liquid separator 111, a sludge tank 113, a horizontal centrifuge 115, an intermediate reflux water tank 116, a medium-temperature ultrafiltration system 118, and a product water tank 119.

[0029] Reactor 102 is used for directional fermentation of bio-carbon sources. Reactor 102 has a barrel-shaped structure, with a feed pump 101 connected to its front end to pump organic slurry from kitchen waste / food waste into it. A central stirrer 105 is installed inside reactor 102 to ensure uniform mixing and maintain suspension of the materials. A microporous aeration pipe is located at the bottom of reactor 102, connected to a blower 107. The blower 107, in conjunction with the microporous aeration pipe, aerates the reactor 102, controlling the dissolved oxygen concentration within it.

[0030] An online monitoring instrument 106 is installed inside the reactor 102 for real-time monitoring of the pH value and dissolved oxygen concentration within the reactor 102. The reactor 102 also has an alkali addition pipe 103, an enhancer dosing pipe 104, and a phosphorus removal agent dosing pipe 109 connected to its internal cavity. The reactor 102 also includes a central intelligent controller, which is electrically connected to a central stirrer 105, a blower 107, the alkali addition pipe 103, the enhancer dosing pipe 104, the phosphorus removal agent dosing pipe 109, and the pre-installed monitoring instrument, for controlling the pH value, dissolved oxygen concentration, and total phosphorus concentration within the reactor 102.

[0031] The slurry produced by directional fermentation in reactor 102 is pumped to a primary solid-liquid separator 110 via reactor discharge pump 108 for solid-liquid separation. The material after primary solid-liquid separation enters a secondary solid-liquid separator 111 for gravity separation. The sludge separated by the secondary solid-liquid separator 111 is transported to a sludge tank 113 via separator discharge pump 112. The bottom of the sludge tank 113 is connected to a sludge pump 114, which transports the sludge discharged from the sludge tank 113 to a horizontal centrifuge 115 for solid-liquid separation. The solid and liquid phases separated by the horizontal centrifuge 115 are sold to black soldier fly larvae farms, while the separated liquid phase is returned to an intermediate return water tank 116. The liquid phase at the top of the secondary solid-liquid separator 111 overflows into the intermediate return water tank 116 through an outlet pipe.

[0032] An agitator is installed in the intermediate return water tank 116. The agitator mixes the liquid phase overflowing from the secondary solid-liquid separator 111 with the effluent separated by the horizontal centrifuge 115. The mixture is then pumped to the ultrafiltration inlet water filter 221 by the ultrafiltration inlet water pump 117 to remove fibers and coarse suspended solids. The effluent from the ultrafiltration inlet water filter 221 enters the medium-temperature ultrafiltration system 118 for final solid-liquid separation. The product water from the medium-temperature ultrafiltration system 118 flows into the product water tank 119, which is connected to the carbon source transfer pump 220.

[0033] In the intermediate-temperature ultrafiltration system 118, 10% to 30% of the concentrate is recycled to reactor 102, while the remaining concentrate is recycled to intermediate reflux tank 116. The suspended solids concentration in intermediate reflux tank 116 is 1.5 to 2.0 times that of the effluent from the secondary solid-liquid separator 111. The concentrate is recycled to reactor 102 to further decompose complex organic matter into easily degradable organic matter, thereby increasing the SCOD concentration of the effluent and improving the solubility of suspended solids. The intermediate-temperature ultrafiltration system 118 uses a membrane system that can withstand temperatures up to 80°C, with the pipeline flow rate controlled at 6 m / L and the operating temperature between 52 and 55°C.

[0034] In this embodiment, the secondary solid-liquid separator 111 is provided with a sedimentation inclined plate, the angle of which is 65% to 80%. Furthermore, the bottom of the secondary solid-liquid separator 111 is equipped with a sludge hopper, the outlet of which is connected to the separator sludge discharge pump 112.

[0035] In this embodiment, a stirrer is provided in the sludge tank 113, and the bottom of the sludge tank 113 is provided with an inclined groove that slopes downward toward the sludge pump 114, so that the sludge pump 114 can pump out sludge.

[0036] Example 2

[0037] Please see Figure 2 This embodiment provides the main operating steps of the biochemical carbon source preparation device for treating biogas slurry and leachate as described in Embodiment 1.

[0038] S1. Inoculation and acclimatization:

[0039] Municipal wet sludge is diluted with water at a ratio of 1:5 to 10 and then pumped into reactor 102. The concentration of sludge in the mixed liquor in reactor 102 is controlled at 20 to 40 g / L, and the mixture is continuously aerated for 3 to 5 days to activate the microorganisms in the sludge. Then, kitchen waste / food waste organic slurry is pumped into reactor 102 through feed pump 101, while the central agitator 105 is started to ensure that the materials are evenly mixed and kept in suspension.

[0040] S2, pH intelligent control: Alkali solution is delivered and mixed through alkali addition pipe 103, and the pH in reactor 102 is detected by pH probe in online detection instrument 106 to maintain it between 6.5 and 7.2.

[0041] S3. Intelligent control of dissolved oxygen: Aeration is introduced into the carbon source reactor 102 by blower 107, and the dissolved oxygen concentration in the reactor 102 is detected by the dissolved oxygen probe in the line detection instrument, and the dissolved oxygen concentration in the reactor 102 is controlled between 0.3 and 0.7 mg / L.

[0042] S4. Phosphorus removal control: Phosphorus removal reagent is added to reactor 102 through the phosphorus removal dosing pipe. The ammonia nitrogen released from the organic slurry, the phosphorus removal reagent and phosphate form a precipitate to remove total phosphorus.

[0043] S5. Addition of fortifier: Microbial fortifier is added through fortifier dosing tube 104 to promote the hydrolysis and acidification of organic pulp and increase VFA concentration.

[0044] S6. Solid-liquid separation: The fermented slurry undergoes solid-liquid separation through a primary solid-liquid separator 110 and a secondary solid-liquid separator 111 to remove suspended solids and sludge.

[0045] S7. Membrane system separation: The mixture is subjected to final solid-liquid separation through the medium-temperature ultrafiltration system 118. The product water is stored in the product water tank 119, 10% to 30% of the concentrate is returned to the reactor 102, and the remaining concentrate is returned to the intermediate return water tank 116.

[0046] S8. Wastewater Treatment: The prepared biochemical carbon source is added to the primary A tank and secondary A tank of the wastewater treatment system to control the influent COD / N ratio between 6 and 8, ensuring that the effluent meets the discharge standards stably.

[0047] In summary, the biochemical carbon source preparation device of this invention can convert organic slurry from kitchen waste / food waste into a high-quality biochemical carbon source, replacing traditional industrial carbon sources, significantly reducing operating costs, effectively supplementing the carbon source deficiency in wastewater treatment systems, optimizing the microbial growth environment, promoting denitrification and phosphorus removal processes, and ensuring stable effluent discharge that meets standards, thus exhibiting significant economic and environmental benefits. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.

[0048] The terms used in this specification, such as "upper", "lower", "left", "right", "front", "back", "middle" and "one", are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A device for preparing a biochemical carbon source for biogas slurry and leachate treatment, characterized by, It includes the following components: A reactor for directional fermentation of a bio-carbon source, wherein the reactor is connected to a secondary solid-liquid separator via a primary solid-liquid separator; A sludge tank, one end of which is connected to the sludge outlet of a secondary solid-liquid separator, and the other end of which is connected to a horizontal centrifuge; The intermediate reflux tank is used to store the liquid phase separated by the secondary solid-liquid separator and the horizontal centrifuge. The intermediate reflux tank pumps the mixed liquid in it to the medium-temperature ultrafiltration system through the ultrafiltration feed water pump. The intermediate temperature ultrafiltration system is used for the final solid-liquid separation of the mixture. The intermediate temperature ultrafiltration system is equipped with an ultrafiltration feed water filter at the front end. A portion of the concentrate produced by the intermediate temperature ultrafiltration system is returned to the reactor through the return pipe, and the remaining concentrate is returned to the intermediate return water tank. The product water tank is used to store the product water of the medium-temperature ultrafiltration system, and the biochemical carbon source in the product water tank is transported to the carbon source transfer pump through the carbon source transfer pump.

2. The biochemical carbon source preparation device according to claim 1, characterized in that, The slurry that has completed directional fermentation and produced acid in the reactor is pumped to the primary solid-liquid separator for solid-liquid separation by the reactor discharge pump. The material after primary solid-liquid separation enters the secondary solid-liquid separator for gravity separation. The liquid phase at the top of the secondary solid-liquid separator overflows to the intermediate return water tank through the water outlet pipe.

3. The biochemical carbon source preparation device according to claim 1 or 2, characterized in that, The secondary solid-liquid separator is equipped with a sedimentation inclined plate with an angle of 65% to 80%. The bottom of the secondary solid-liquid separator is equipped with a sludge hopper, and the outlet of the sludge hopper is connected to the separator sludge discharge pump. The sludge is transported to the sludge tank through the separator sludge discharge pump.

4. The biochemical carbon source preparation device according to claim 1, characterized in that, The bottom of the sludge tank is connected to a sludge pump, which transports the sludge from the sludge tank to a horizontal centrifuge for solid-liquid separation. The solid and liquid separated by the horizontal centrifuge are sold to black soldier fly larvae for breeding, while the separated liquid phase is returned to the intermediate return water tank.

5. The biochemical carbon source preparation device according to claim 1 or 4, characterized in that, Both the sludge tank and the intermediate return water tank are equipped with agitators.

6. The biochemical carbon source preparation device according to claim 1, characterized by The reactor is equipped with a central stirrer in the middle and a microporous aeration pipe at the bottom, which is connected to a blower.

7. The biochemical carbon source preparation device according to claim 6, characterized in that, The reactor is equipped with online monitoring instruments for real-time monitoring of pH and dissolved oxygen concentration. The reactor is also equipped with alkali addition pipe, enhancer addition pipe and phosphorus removal agent addition pipe that connect to its internal cavity.

8. The biochemical carbon source preparation apparatus according to claim 7, characterized in that, The reactor also includes a central intelligent controller, which is electrically connected to a central stirrer, a blower, an alkali addition pipe, a strengthening agent addition pipe, a phosphorus removal agent addition pipe, and a pre-detection instrument, and is used to control the pH value, dissolved oxygen concentration, and total phosphorus concentration in the reactor. 9.The biochemical carbon source preparation device according to claim 1, characterized in that, The reactor is equipped with a feed pump at the front end for pumping organic slurry into the reactor.

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