Palm oil wastewater anaerobic fermentation treatment process based on coordinated regulation and control of multiple alkaline materials

Abstract

The invention provides a palm oil wastewater anaerobic fermentation treatment process based on coordinated regulation and control of multiple alkaline materials. The palm oil wastewater anaerobic fermentation treatment process comprises the following steps: S1, removing suspended solids and fibrous impurities from palm oil wastewater through a filter; s2, the filtered wastewater is fed into a regulating tank, an alkaline regulating agent is added into the regulating tank, the alkaline regulating agent comprises calcium hydroxide and a synergistic alkaline mineral material, and the synergistic alkaline mineral material comprises one or more of magnesium hydroxide, calcium carbonate, red mud powder or dolomite powder; and S3, introducing the uniformly mixed palm oil wastewater in the adjusting tank into an anaerobic reactor for anaerobic fermentation. According to the invention, the alkaline regulating agent composed of calcium hydroxide and a synergistic alkaline mineral material is added, multiple alkaline minerals are introduced, a stable multi-component buffer system is established, the pH of wastewater is regulated, VFA accumulation is inhibited, sludge granulation is promoted, and anaerobic fermentation efficiency and system stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of anaerobic fermentation, and in particular to an anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials. Background Art

[0002] Palm oil wastewater, a high-concentration organic wastewater generated during palm oil production, is a typical example of industrial wastewater. Its complex water quality characteristics make it challenging to treat. Palm oil wastewater is characterized by high COD, high suspended solids, high oil content, and low pH. Direct discharge without treatment can cause serious environmental pollution. Currently, anaerobic fermentation technology, due to its advantages such as high energy recovery efficiency and low sludge production, has become a leading method for treating high-concentration organic wastewater.

[0003] However, the existing anaerobic fermentation process still has the following problems when treating palm oil wastewater: 1. Traditional processes mostly use a single alkaline substance such as sodium hydroxide or calcium hydroxide to adjust the pH. However, due to the decomposition of oil in palm oil wastewater to produce a large amount of volatile fatty acids (VFA), it is easy to cause pH fluctuations and affect the stability of the system.

[0004] 2. Existing pH adjustment methods often react quickly but are short-lived, and are unable to cope with the acidic substances continuously produced during the anaerobic process, resulting in the need for frequent addition of alkaline substances, which increases operating costs.

[0005] 3. Palm oil wastewater contains a variety of substances that may inhibit the activity of anaerobic microorganisms. The existing single alkaline regulator is difficult to effectively adsorb and remove these inhibitors.

[0006] 4. The high oil content in palm oil wastewater will affect the sedimentation performance and granulation process of anaerobic sludge, and the existing technology lacks effective measures to promote the formation of sludge particles.

[0007] 5. The method of adding alkaline regulator is not accurate and automated enough. Manual operation causes large pH fluctuations, affecting the treatment effect.

[0008] Therefore, it is urgent to develop an anaerobic fermentation treatment process for palm oil wastewater that can synergistically regulate pH value, promote sludge particle formation, and improve system stability, so as to improve treatment efficiency and biogas production. Summary of the Invention

[0009] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide an anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials, which is used to solve the problems of acidic pH, rapid accumulation of volatile fatty acids, lack of a stable buffer system, difficulty in forming anaerobic sludge particles, and limited pH adjustment ability of a single Ca(OH)2 in the anaerobic treatment process of palm oil wastewater in the prior art.

[0010] To achieve the above-mentioned and other related purposes, the present invention provides an anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials, comprising the following steps: S1. First, the palm oil wastewater is passed through a filter to remove suspended matter and fibrous impurities; S2. Sending the filtered wastewater into a regulating tank, and adding an alkaline regulator to the regulating tank, wherein the alkaline regulator includes calcium hydroxide and a synergistic alkaline mineral material, and the synergistic alkaline mineral material includes one or more of magnesium hydroxide, calcium carbonate, red mud powder or dolomite powder; S3. The palm oil wastewater mixed evenly in the regulating tank is introduced into the anaerobic reactor for anaerobic fermentation.

[0011] Furthermore, in step S2, the mass ratio of calcium hydroxide to the synergistic alkaline mineral material is 1:(0.2-1.0).

[0012] Furthermore, in step S2, the dosage of the alkaline regulator in the wastewater is 0.5%-1%, that is, 5-10 kg of alkaline regulator is added to 1 ton of wastewater, so that the pH value of the wastewater in the regulating tank is stabilized between 6.8-7.2.

[0013] Furthermore, the alkaline regulating agents are all powders with an average particle size of less than 100 μm.

[0014] Specifically, the average particle size of calcium hydroxide is 10-30 μm, the average particle size of magnesium hydroxide is 5-20 μm, the average particle size of calcium carbonate or dolomite powder is 20-50 μm, and the average particle size of red mud powder is greater than 100 μm.

[0015] Magnesium hydroxide provides Mg 2+ , Ca2 + Mg 2+ They work together to form bridge structures on extracellular polymeric substances (EPS) and fatty acids, increasing the strength, density, and sedimentation of anaerobic granular sludge. They also form insoluble salts with volatile fatty acids, reducing their toxicity and slowing acid accumulation. The slow-release components in calcium carbonate, dolomite, or red mud gradually dissolve, providing delayed regulation of VFA bursts and load fluctuations, inhibiting drastic pH drops. Compared to the "rapid adjustment and rapid drop" of Ca(OH)2, this is more conducive to maintaining the long-term stable operation of anaerobic systems. Red mud has a porous structure and can adsorb oils, heavy metals, phosphorus, and phenolic substances. It can also serve as a support for microbial attachment, improving startup speed and strain stability. Red mud powder is a powder with a particle size of less than 100μm after drying and pulverization. The smaller the particle size, the greater the specific surface area and the better the adsorption effect. Its pH value is also greater than 9.

[0016] Further, the adjusting tank and the anaerobic reactor are provided with stirring and mixing devices. The stirring and mixing device in the adjusting tank preferably adopts a low-speed plug flow type stirrer with a rotation speed of 30-60 rpm, which ensures that the alkaline control agent is fully mixed with the wastewater while avoiding excessive stirring to increase energy consumption. The rotation speed of the stirring and mixing device in the anaerobic reactor is controlled at 20-40 rpm, and the device is intermittently operated for 10-20 minutes per hour. The stirring and mixing device preferably adopts frequency conversion control, and the stirring intensity can be automatically adjusted according to the amount of wastewater in the tank.

[0017] Further, the anaerobic reactor is further provided with a liquid level meter, a temperature sensor, a pressure sensor, a biogas flow meter, a biogas gas analyzer and a pH meter. The liquid level meter adopts an ultrasonic liquid level meter to monitor the liquid level change in the reactor in real time; the temperature sensor adopts a PT100 thermal resistance to monitor the temperature in the reactor and is linked with the heating system; the pressure sensor monitors the gas phase pressure in the reactor to prevent overpressure; the biogas flow meter adopts a thermal gas mass flow meter to accurately measure the gas production; the biogas gas analyzer monitors the gas content of methane, carbon dioxide and hydrogen sulfide in the biogas online; and the pH meter adopts an industrial online pH electrode to monitor the pH value change in the reactor in real time.

[0018] In an embodiment of the present application, a double-path powder automatic metering and adding device is arranged above the adjusting tank and is used for adding calcium hydroxide and the synergistic alkaline mineral material, respectively, to directly add the solid powder into the adjusting tank. This adding mode is more accurate and automatic, and the control system automatically adjusts the adding amount of calcium hydroxide and the synergistic alkaline mineral material according to the real-time monitoring result of the pH value of the wastewater, so as to ensure that the pH value of the wastewater is maintained within the target range.

[0019] In another embodiment of the present application, a pneumatic conveying system is arranged above the adjusting tank to realize dust-free transfer of the alkaline control agent, and then the alkaline control agent is mixed with water flow to form a homogeneous mixture for adding.

[0020] Further, the pneumatic conveying system comprises a powder storage tank, a pneumatic conveying pipeline, a water flow supply pipeline and a Venturi mixing injector. The lower end of the powder storage tank is connected with the pneumatic conveying pipeline, the pneumatic conveying pipeline uses compressed air to convey the powder to the Venturi mixing injector, the water flow supply pipeline conveys water flow to the Venturi mixing injector, and the alkaline control agent and the water flow are mixed in the Venturi mixing injector to form alkaline slurry which is added to the adjusting tank. This adding mode avoids dust flying and improves the operation environment quality and adding uniformity.

[0021] Still further, the lower end of the powder storage tank is connected with the pneumatic conveying pipeline through a rotary feeder for controlling the in-out amount of the powder to ensure sealed and quantitative conveying.

[0022] Alkaline powders such as calcium hydroxide and red mud are prone to moisture absorption and agglomeration. Direct dry dosing can produce large amounts of alkaline dust, which is irritating to the eyes and nose and highly corrosive. A pneumatic conveying system with fully enclosed conveying significantly reduces the risk of occupational hazards on site. Combined with a Venturi mixer, "dry conveying and wet mixing" is achieved. The powder is instantly dispersed in the high-velocity water flow, forming a stable slurry for a more thorough reaction. In the event of a load shock (such as VFA accumulation), the alkali source dosage can be rapidly increased, enhancing the buffer capacity and preventing the anaerobic system from collapsing. Furthermore, wet dispersion reduces the agglomeration and deposition of Ca(OH)2, extending the service life of pipes, pumps, and valves.

[0023] As described above, the anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials of the present invention has the following beneficial effects: 1. This invention introduces a variety of alkaline minerals by adding an alkaline regulator composed of calcium hydroxide and a synergistic alkaline mineral material to establish a stable multi-component buffer system. This system regulates wastewater pH, inhibits VFA accumulation, promotes sludge granulation, and improves anaerobic fermentation efficiency and system stability. Compared with traditional single-source alkalinity regulation methods, this invention significantly improves COD removal and biogas production, reduces H2S concentration, and is suitable for resource utilization of high-concentration organic wastewater such as palm oil wastewater.

[0024] 2. Magnesium hydroxide provides Mg 2+ , Ca2 + Mg 2+ They work together to form bridge structures on extracellular polymers and fatty acids, improve the strength, density and sedimentation of anaerobic granular sludge, and form insoluble salts with volatile fatty acids, reducing their toxicity and slowing down acid accumulation; while the slow-release components in calcium carbonate, dolomite or red mud gradually dissolve, which can hysteresis adjust VFA bursts and load fluctuations, inhibiting the sharp drop in pH, and is more conducive to maintaining the long-term stable operation of the anaerobic system compared to the "quick adjustment and quick drop" of Ca(OH)2.

[0025] 3. The red mud in the synergistic alkaline mineral material has a porous structure and has the function of adsorbing oil, heavy metals, phosphorus, phenolic substances, etc.; it can also serve as a support carrier for microbial attachment, promote the formation of anaerobic sludge particles, and improve the sedimentation and reaction efficiency of the sludge.

[0026] 4. Alkaline materials are automatically added through the pneumatic conveying system, achieving contactless closed transportation, which can avoid the dust hazard caused by dry addition; combined with the Venturi mixing ejector to achieve "dry delivery and wet mixing", the powder is instantly dispersed in the high-speed water flow to form a stable slurry, and the reaction is more thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of the anaerobic fermentation treatment device for palm oil wastewater based on the coordinated regulation of multiple alkaline materials disclosed in Example 1 of the present invention.

[0028] Figure 2 This is a schematic structural diagram of the pneumatic conveying system disclosed in Example 5 of the present invention.

[0029] Component number description: 1. Filter; 2. Equalization tank; 21. Dual-channel automatic powder metering and dosing device; 22. Stirring and mixing device; 3. Anaerobic reactor; 31. Temperature sensor; 32. Liquid level gauge; 33. Pressure sensor; 34. Biogas flow meter; 35. Biogas analyzer; 36. pH meter; 4. Pneumatic conveying system; 41. Powder storage tank; 42. Rotary feeder; 43. Pneumatic conveying pipeline; 44. Water supply pipeline; 45. Compressor; 46. Venturi mixing ejector. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0031] Example 1 This embodiment provides a palm oil wastewater anaerobic fermentation treatment process based on the coordinated regulation of multiple alkaline materials. The device structure used in the anaerobic fermentation treatment process is referenced to Figure 1 , the treatment process includes the following steps: S1. First, pass the palm oil wastewater through filter 1 to remove suspended matter and fibrous impurities.

[0032] Specifically, palm oil wastewater contains large amounts of suspended matter and fibrous impurities, which can affect the stability and efficiency of the subsequent anaerobic fermentation process. Therefore, the raw palm oil wastewater is pretreated using an automated filter with a pore size of 0.5-2 mm to remove suspended matter and fibrous impurities. The filter is installed at an angle, allowing trapped solids to slide down the filter surface into the collection tank, preventing filter clogging. The suspended matter content in the filtered wastewater is reduced by over 80%, creating optimal conditions for subsequent treatment.

[0033] S2. Send the filtered wastewater into the regulating tank 2, and add an alkaline regulator to the regulating tank, wherein the alkaline regulator includes calcium hydroxide and a synergistic alkaline mineral material, and the synergistic alkaline mineral material is magnesium hydroxide; 3 kg of calcium hydroxide and 2 kg of magnesium hydroxide are added per ton of wastewater to stabilize the pH at 6.9-7.1; the average particle size of the calcium hydroxide is 20 μm, and the average particle size of the magnesium hydroxide is 10 μm. This particle size distribution can maintain a good sustained release effect and sedimentation balance.

[0034] A dual-channel automatic powder metering and dosing device 21 is installed above the regulating tank, used to add calcium hydroxide and magnesium hydroxide respectively. This device includes two independent storage silos, a metering screw feeder, and a control system. The control system automatically adjusts the dosage of the two alkaline materials based on real-time wastewater pH monitoring to ensure the wastewater pH remains within the target range. A stirring and mixing device 22 is also installed within the regulating tank.

[0035] S3. The palm oil wastewater mixed evenly in the regulating tank is introduced into the anaerobic reactor 3 for anaerobic fermentation.

[0036] The palm oil wastewater, once adjusted to an appropriate pH range and uniformly mixed in the regulating tank, is then transported to the anaerobic reactor via a lift pump and piping system. The anaerobic reactor utilizes an upflow anaerobic sludge blanket (UASB) structure, with an effective volume three times the daily wastewater treatment capacity and a hydraulic retention time of three days. The temperature within the reactor is controlled within the mesophilic range of 35±2°C, which is conducive to the growth and metabolic activity of anaerobic microorganisms.

[0037] The anaerobic reactor is equipped with a stirring and mixing device 22, which combines low-speed mechanical stirring with biogas recirculation to ensure uniform mixing of materials within the reactor and avoid the formation of dead zones. The mechanical stirrer speed is controlled at 20-40 rpm and operates intermittently for 15 minutes per hour. The anaerobic reactor 3 is also equipped with monitoring equipment such as a liquid level meter 32, a temperature sensor 31, a pressure sensor 33, a biogas flow meter 34, a biogas analyzer 35, and a pH meter 36.

[0038] During the anaerobic fermentation process, anaerobic microorganisms decompose the organic matter in palm oil wastewater into gaseous products such as methane and carbon dioxide, as well as simple organic matter. The calcium hydroxide in the alkaline regulator added earlier can quickly neutralize the organic acids produced during the acidification phase, while the magnesium hydroxide continuously and slowly releases alkalinity, maintaining a stable pH value in the system. This effectively prevents acidification of the anaerobic system and improves the system's ability to withstand shock loads.

[0039] During the anaerobic fermentation process, biogas production stabilizes at 385L / kg COD, methane content reaches 70%, and COD removal efficiency reaches 82%. After desulfurization and dehydration, the generated biogas can be used for boiler combustion or power generation, achieving energy recovery. The effluent COD concentration after anaerobic treatment is reduced to 10,000-15,000mg / L, allowing for further aerobic treatment or reuse for farmland irrigation.

[0040] Example 2 This embodiment provides an anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials. Compared with Example 1, the only difference is that: In step S2, the alkaline regulator includes calcium hydroxide and a synergistic alkaline mineral material. The synergistic alkaline mineral material is selected from magnesium hydroxide and calcium carbonate, that is, 3 kg of calcium hydroxide, 0.65 kg of magnesium hydroxide, and 1.35 kg of calcium carbonate are added per ton of wastewater to stabilize the pH at around 7.2; wherein the average particle size of calcium hydroxide is 20 μm, the average particle size of magnesium hydroxide is 10 μm, and the average particle size of calcium carbonate is 25 μm.

[0041] During the anaerobic fermentation process, the biogas yield stabilized at 410L / kg COD, the methane content reached 71%, the COD removal rate reached 85%, and the effluent COD concentration after anaerobic treatment dropped to 8000-12000mg / L.

[0042] Example 3 This embodiment provides an anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials. Compared with Example 1, the only difference is that: In step S2, the alkaline regulator includes calcium hydroxide and a synergistic alkaline mineral material. The synergistic alkaline mineral material is selected from magnesium hydroxide and red mud powder. That is, 3 kg of calcium hydroxide, 0.65 kg of magnesium hydroxide, and 1.35 kg of red mud powder are added to each ton of wastewater to stabilize the pH at 6.9-7.2; wherein the average particle size of the calcium hydroxide is 20 μm, the average particle size of the magnesium hydroxide is 10 μm, and the average particle size of the red mud powder is 90 μm.

[0043] During the anaerobic fermentation process, the biogas yield stabilized at 430L / kg COD, the methane content reached 70%, the COD removal rate reached 87%, the effluent COD concentration after anaerobic treatment dropped to 8000-12000mg / L, and the H2S concentration in the biogas dropped from 1800 ppm to 820 ppm.

[0044] Example 4 This embodiment provides an anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials. Compared with Example 1, the only difference is that: In step S2, the alkaline regulator includes calcium hydroxide and synergistic alkaline mineral materials, and the synergistic alkaline mineral materials are selected from magnesium hydroxide, calcium carbonate, red mud powder and dolomite powder, that is, 3 kg of calcium hydroxide, 0.5 kg of magnesium hydroxide, 0.5 kg of calcium carbonate, 0.5 kg of red mud powder and 0.5 kg of dolomite powder are added to each ton of wastewater to stabilize the pH at 6.9~7.2; wherein the average particle size of calcium hydroxide is 20 μm, the average particle size of magnesium hydroxide is 10 μm, the average particle size of calcium carbonate is 25 μm, the average particle size of red mud powder is 90 μm, and the average particle size of dolomite powder is 40 μm.

[0045] During the anaerobic fermentation process, the biogas yield stabilized at 445L / kg COD, the methane content reached 73%, the COD removal rate reached 88%, the effluent COD concentration after anaerobic treatment dropped to 5000-10000mg / L, and the H2S concentration in the biogas dropped to 900 ppm.

[0046] Example 5 This embodiment provides an anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials. Compared with Example 1, the only difference is that: A pneumatic conveying system 4 is provided above the regulating tank, which mixes the alkaline regulating agent with the water flow to form a homogeneous mixture and then adds the mixture to achieve dust-free transportation of the alkaline regulating agent.

[0047] refer to Figure 2 The pneumatic conveying system 4 includes a powder storage tank 41, a pneumatic conveying pipeline 43, a water supply pipeline 44 and a venturi mixing injector 46. The lower end of the powder storage tank is connected to the pneumatic conveying pipeline 43 through a rotary feeder 42. The rotary feeder can accurately control the inlet and outlet of the powder to ensure sealing and quantitative delivery. The pneumatic conveying pipeline 43 uses the positive pressure provided by the compressor 45 to transport the powder to the venturi mixing injector 46, and the water supply pipeline transports the water to the venturi mixing injector. After the alkaline regulator and the water are mixed in the venturi mixing injector, an alkaline slurry is formed and added to the regulating tank. Venturi mixing can improve the powder dispersion efficiency and reaction rate, while avoiding the problem of dust flying, and improving the quality of the operating environment and the uniformity of dosing.

[0048] Comparative Example 1 This comparative example provides an anaerobic fermentation treatment process for palm oil wastewater. Compared with Example 1, the only difference is that in step S2, only calcium hydroxide is used as the alkaline regulator, that is, 5 kg of calcium hydroxide is added per ton of wastewater to stabilize the pH at 7.0; wherein the average particle size of the calcium hydroxide is 20 μm.

[0049] During the anaerobic fermentation process, the biogas yield is about 310L / kg COD, the methane content is about 60%, the COD removal rate is about 74%, and the COD concentration of the effluent after anaerobic treatment is reduced to 16000-18000mg / L In summary, the present invention, by adding an alkaline control agent composed of calcium hydroxide and a synergistic alkaline mineral material, introduces multiple alkaline minerals to establish a stable multi-component buffer system, regulates wastewater pH, inhibits VFA accumulation, promotes sludge granulation, and improves anaerobic fermentation efficiency and system stability. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. The anaerobic fermentation treatment process for palm oil wastewater based on the coordinated regulation of multiple alkaline materials is characterized in that: The steps include: S1. First, the palm oil wastewater is passed through a filter to remove suspended matter and fibrous impurities; S2. Sending the filtered wastewater into a regulating tank, and adding an alkaline regulator to the regulating tank, wherein the alkaline regulator includes calcium hydroxide and a synergistic alkaline mineral material, and the synergistic alkaline mineral material includes one or more of magnesium hydroxide, calcium carbonate, red mud powder or dolomite powder; S3. The palm oil wastewater mixed evenly in the regulating tank is introduced into the anaerobic reactor for anaerobic fermentation.

2. The anaerobic fermentation treatment process for palm oil wastewater according to claim 1, characterized in that: In step S2, the mass ratio of calcium hydroxide to the synergistic alkaline mineral material is 1:(0.2–1.0).

3. The anaerobic fermentation treatment process for palm oil wastewater according to claim 1, characterized in that: In step S2, the dosage of the alkaline regulator in the wastewater is 0.5% to 1%, so that the pH value of the wastewater in the regulating tank is stabilized between 6.8 and 7.

2.

4. The anaerobic fermentation treatment process for palm oil wastewater according to claim 1, characterized in that: The alkaline regulating agents are all powders with an average particle size of less than 100 μm.

5. The anaerobic fermentation treatment process for palm oil wastewater according to claim 4, characterized in that: The average particle size of calcium hydroxide is 10-30 μm, the average particle size of magnesium hydroxide is 5-20 μm, and the average particle size of calcium carbonate or dolomite powder is 20-50 μm, maintaining a balanced release effect and sedimentation; the average particle size of red mud powder is less than 100 μm.

6. The anaerobic fermentation treatment process for palm oil wastewater according to any one of claims 1 to 5, characterized in that: A dual-path automatic powder metering and dosing device is provided above the regulating tank, which is used for adding calcium hydroxide and synergistic alkaline mineral materials respectively.

7. The anaerobic fermentation treatment process for palm oil wastewater according to any one of claims 1 to 5, characterized in that: A pneumatic conveying system is provided above the regulating tank to realize dust-free transportation of the alkaline regulating agent, which is then mixed with the water flow to form a homogeneous mixture for addition.

8. The anaerobic fermentation treatment process for palm oil wastewater according to claim 7, characterized in that: The pneumatic conveying system includes a powder storage tank, a pneumatic conveying pipeline, a water supply pipeline and a Venturi mixing ejector. The lower end of the powder storage tank is connected to the pneumatic conveying pipeline. The pneumatic conveying pipeline uses compressed air to convey the powder to the Venturi mixing ejector. The air-water supply pipeline conveys the water to the Venturi mixing ejector. The alkaline control agent and the water are mixed in the Venturi mixing ejector to form an alkaline slurry, which is added to the regulating tank.

9. The anaerobic fermentation treatment process for palm oil wastewater according to claim 8, characterized in that: The lower end of the powder storage tank is connected to the pneumatic conveying pipeline through a rotary feeder, and the rotary feeder is used to control the inflow and outflow of powder.

10. The anaerobic fermentation treatment process for palm oil wastewater according to claim 1, characterized in that: The regulating tank and the anaerobic reactor are provided with stirring and mixing devices; the anaerobic reactor is also provided with a liquid level meter, a temperature sensor, a pressure sensor, a biogas flow meter, a biogas analyzer, and a pH meter.

Images