A sludge deodorization pretreatment system before pressure filtration

Abstract

The application discloses a sludge pressure filtration deodorization pretreatment system and belongs to the sludge deodorization field. The pretreatment system comprises a stirring reactor, a stirrer, a pesticide spraying device, an oxygen spraying device and a tail gas deodorization device; the stirrer, the pesticide spraying device, the oxygen spraying device and the tail gas deodorization device are arranged in the interior of the stirring reactor; the stirrer is used for stirring the sludge input into the stirring reactor; the pesticide spraying device is internally provided with an odor purifier and is used for spraying the odor purifier into the sludge; the oxygen spraying device is used for delivering oxygen-containing gas into the sludge; and the tail gas deodorization device is used for treating the odor generated in the reaction of the sludge. The odor purifier sprayed by the pesticide spraying device can effectively remove the odor in the sludge, and the oxygen-rich environment can be created by cooperating with the oxygen spraying device, and the tail gas can be further treated by the tail gas treatment device, so that the odor of the sludge is further purified.

Description

TECHNICAL FIELD

[0001] The present application relates to sludge deodorization, in particular to a sludge deodorization pretreatment system before pressure filtration. BACKGROUND

[0002] The primary sludge discharged from the bottom of the primary sedimentation tank contains about 3% to 8% of the same body substance concentration (1% solid matter concentration is equivalent to 100 mL of sludge containing 1 g of solid matter); The organic matter in the primary sludge accounts for about 70% of the solid matter, so the primary sludge is prone to anaerobic state and odor; In view of the above problems, Chinese patent CN117602785A discloses a sludge deodorization system, which comprises a sludge deodorization bin and a negative pressure collection bin, the sludge deodorization bin and the negative pressure collection bin are connected by a negative pressure gas collection pipe outside, a placing cylinder is rotatably connected to the upper middle of the sludge deodorization bin, stirring rods are arranged on the left and right parts of the placing cylinder, the stirring rods are fixedly provided with fixed rods, the upper sides of the fixed rods are fixedly connected with incomplete gears, the two incomplete gears are connected with each other, and the middle sides of the incomplete gears are fixedly connected with fixed shafts, which solves the problems of the existing technology that the gas under the sludge is not easy to discharge, the sludge becomes smelly, the sludge is not convenient to stir, and the sludge deodorization effect is poor. But the above prior art only discharges the already generated malodorous gas in the sludge, but the sludge will still continuously generate malodorous substances, and the problem of sludge odor production has not been fundamentally solved, so there is an urgent need for a sludge deodorization system. SUMMARY

[0003] The purpose of the present application is to provide a sludge deodorization pretreatment system before pressure filtration.

[0004] Technical scheme: A sludge deodorization pretreatment system before pressure filtration, comprising a stirring reactor, a stirrer, a pesticide spraying device, an oxygen spraying device and a tail gas deodorization device; The stirrer, the pesticide spraying device, the oxygen spraying device and the tail gas deodorization device are arranged in the interior of the stirring reactor; The stirrer is used for stirring the sludge input into the stirring reactor; The pesticide spraying device is provided with an odor purifier, which is used for spraying the odor purifier into the sludge; The oxygen spraying device is used for delivering oxygen-containing gas into the sludge; The tail gas deodorization device is used for treating the odor generated in the reaction of the sludge.

[0005] Preferably, the pretreatment system is arranged at 0.8-1.0 m in front of the pressure filter.

[0006] Preferably, the odor purification agent comprises ferric chloride, calcium bentonite, potassium permanganate, 5-15% sodium hypochlorite solution and Ti-containing blast furnace slag, wherein the particle size of the calcium bentonite is 100-200 mesh, the particle size of the Ti-containing blast furnace slag is 50-100 mesh; the agent accounts for 0.2-8% of the mass of the sludge, the calcium bentonite accounts for 0.2-10% of the mass of the agent, the Ti-containing blast furnace slag accounts for 20-50% of the mass of the agent, the ferric chloride accounts for 5-30% of the mass of the agent, and the potassium permanganate accounts for 10-40% of the mass of the agent.

[0007] Preferably, the agent spraying device has two nozzles for spraying 5-15% sodium hypochlorite solution and a mixture of ferric chloride, calcium bentonite, potassium permanganate and Ti-containing blast furnace slag, respectively, and the agent is sprayed every 3-5 minutes.

[0008] Preferably, the oxygen spraying device comprises oxygen lances, oxygen supply pipelines, air flow valves and gas tanks; two oxygen lances are arranged symmetrically at an angle of 40-100° on the same horizontal line, the oxygen lances are Laval nozzles with three nozzles, the oxygen content of the gas in the gas tank is 10-30%, the gas supply speed is 2-10 L / min, and the oxygen is sprayed while the agitator is working.

[0009] Preferably, the tail gas deodorization device is provided with 10-20 Kg of mixed solid of calcium bentonite and Ti-containing blast furnace slag, and the ratio is 1:3.

[0010] Beneficial effects:

[0011] (1) The present application can create an alkaline environment in the whole sludge mixing system by spraying the odor purification agent into the sludge, and the ferric chloride solution added to the sludge can make the sludge alkaline, thereby inhibiting the activity of bacteria, pathogens and odor substances in the sludge, and the ferric chloride can react with the acidic gas (such as hydrogen sulfide, ammonia, etc.) in the sludge to form non-volatile salts. The calcium-based bentonite has a large specific surface area and a porous structure, which can effectively adsorb organic gases and odor molecules in the sludge, such as volatile organic compounds (VOCs) and odor components. The alkaline properties of calcium-based bentonite can also neutralize some acidic gases (such as hydrogen sulfide, ammonia), thereby reducing the release of these gases and odor. The porous structure and large specific surface area of the blast furnace slag enable it to effectively adsorb odor molecules in the air, and the Ti oxide has good catalytic properties, which can promote the degradation of organic matter in the sludge and reduce the generation of odor. Sodium hypochlorite and potassium permanganate are both strong oxidizing agents, which can oxidize organic matter in the sludge. These organic substances are often the main source of odor. Through oxidation reaction, organic matter is converted into odorless or low-odor compounds, thereby reducing odor. Sodium hypochlorite can release hypochlorous acid (HOCl) when it comes into contact with water in the sludge, which has strong bactericidal effect and can remove pathogenic microorganisms in water and sludge, reducing odor caused by microbial activity.

[0012] (2) The oxygen injection device in the present application can create an oxygen-rich environment, which is not conducive to the survival of anaerobic bacteria, inhibits their decomposition of organic matter, prevents the generation of malodorous gas, and further improves the deodorization effect.

[0013] (3) The stirring device in the present application can make the sludge fully react with oxygen and odor-removing agent, improving the deodorization efficiency.

[0014] (4) The calcium-based bentonite and Ti-containing blast furnace slag mixed solid placed in the tail gas deodorization device of the present application further deodorize the tail gas, so as to meet the emission standard, not only solving the problem of sludge odor, but also purifying the tail gas generated in the reaction process, reducing the impact on the environment. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the system principle of the present application. DETAILED DESCRIPTION

[0016] In order to make the technical scheme of the present application clearer, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0017] EMBODIMENT

[0018] As Figure 1As shown, a sludge pre-deodorization pretreatment system before filter pressing is arranged at 0.8-1.0 m in front of the filter press, the pretreatment system comprises a stirring reactor internally provided with an agitator, a medicine spraying device (with built-in odor purifier) and an oxygen spraying device, and a tail gas deodorization device (with built-in 10-20 Kg calcium bentonite mixed with Ti-containing blast furnace slag at a ratio of 1:3). The stirring reactor and the tail gas deodorization device are both arranged on the ground, and the stirring reactor is connected with the medicine spraying device, the oxygen spraying device and the tail gas deodorization device through pipelines. A pressure valve is installed between the tail gas deodorization device and the stirring reactor, and a gas detector is built in the tail gas deodorization device. When it is necessary to deodorize the sludge, the sludge is first transported into the stirring reactor, the agitator in the stirring reactor starts to stir the sludge at a stirring speed of 30-150 rpm for 0.5-3 hours, while the two nozzles of the medicine spraying device spray the odor purifier every 3-5 min, each spraying lasts for 10-20 seconds, and the total amount of the sprayed medicine accounts for 0.2%-8% of the mass of the sludge. The odor purifier comprises 5-15% sodium hypochlorite solution and other four kinds of solid mixtures (100 mesh-200 mesh calcium bentonite accounting for 0.2%-10% of the mass of the medicine, 50 mesh-100 mesh Ti-containing blast furnace slag accounting for 20%-50% of the mass of the medicine, 5-30% of the mass of the medicine of ferric chloride, and 10-40% of the mass of the medicine of potassium permanganate), which are sprayed by the two nozzles respectively.

[0019] Then the oxygen spraying device opens the gas flow valve, the gas with oxygen content of 10-30% in the gas tank is transported into the sludge through the oxygen conveying pipeline through two oxygen guns arranged symmetrically on the same horizontal line with an included angle of 40°-100° and each carrying three nozzles, the odor gas generated in the reaction of the sludge is introduced into the deodorization device through the connecting pipeline, and the odor gas is further treated in the deodorization device. When the detected gas reaches the emission standard, the gas is discharged.

[0020] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A sludge deodorization pretreatment system before filter press, characterized in that, It includes a stirred reactor, an agitator, a spraying device, an oxygen spraying device, and an exhaust gas deodorization device; the agitator, spraying device, and oxygen spraying device are located inside the stirred reactor; the agitator is used to stir the sludge fed into the stirred reactor; the spraying device has an internal odor purifier for spraying the odor purifier into the sludge; the oxygen spraying device is used to deliver oxygen-containing gas into the sludge; and the exhaust gas deodorization device is used to treat the odor generated by the sludge during the reaction. The odor purifier includes ferric chloride, calcium-based bentonite, potassium permanganate, a sodium hypochlorite solution with a mass fraction of 5-15%, and Ti-containing blast furnace slag. The particle size of the calcium-based bentonite is 100-200 mesh, and the particle size of the Ti-containing blast furnace slag is 50-100 mesh. The reagent accounts for 0.2%-8% of the sludge mass, while the calcium-based bentonite accounts for 0.2%-10% of the reagent mass, the Ti-containing blast furnace slag accounts for 20%-50% of the reagent mass, the ferric chloride accounts for 5-30% of the reagent mass, and the potassium permanganate accounts for 10-40% of the reagent mass.

2. The sludge deodorization pretreatment system before filter press filtration according to claim 1, characterized in that, The pretreatment system is located 0.8-1.0m in front of the filter press.

3. The sludge deodorization pretreatment system before filter press filtration according to claim 1, characterized in that, The spraying device has two nozzles that spray a mixture of sodium hypochlorite solution (5-15% by mass) with ferric chloride, calcium-based bentonite, potassium permanganate, and Ti-containing blast furnace slag, with the agent being sprayed once every 3-5 minutes.

4. The sludge deodorization pretreatment system before filter press filtration according to claim 1, characterized in that, The oxygen injection device includes an oxygen lance, an oxygen delivery pipeline, an airflow valve, and a gas tank; two oxygen lances are set up symmetrically on the same horizontal line at an angle of 40°-100°. The oxygen lances are Laval type nozzles with three nozzles. The oxygen content of the gas in the gas tank is 10%-30%, and the gas supply rate is 2-10L / min. The gas is injected while the agitator is working.

5. The sludge deodorization pretreatment system before filter press filtration according to claim 1, characterized in that, The exhaust gas deodorization device contains 10-20 kg of a mixture of calcium-based bentonite and Ti-containing blast furnace slag in a ratio of 1:3.

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