Deodorization pretreatment system before sludge filter pressing

Abstract

The invention discloses a deodorization pretreatment system before sludge filter pressing, and belongs to the field of sludge deodorization. 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 stirring reactor; the stirrer is used for stirring the sludge input into the stirring reactor; a peculiar smell purifying agent is arranged in the spraying device and is used for spraying the peculiar smell purifying agent into the sludge; the oxygen spraying device is used for conveying oxygen-containing gas into the sludge; and the tail gas deodorization device is used for treating odor generated in the reaction of the sludge. Odor in sludge can be effectively removed through an odor purifying agent sprayed by the pesticide spraying device, an oxygen-enriched environment can be created in cooperation with the oxygen spraying device, tail gas is further treated through the tail gas treatment device, and therefore the odor of the sludge is further purified.

Description

Technical Field

[0001] The invention relates to sludge deodorization, in particular to a sludge deodorization pretreatment system before sludge filter pressing. Background Art

[0002] The primary sludge discharged from the bottom of the primary sedimentation tank contains a solid matter concentration of about 3% to 8% (1% solid matter concentration is equivalent to 100mL of sludge containing 1g of solid matter); organic matter accounts for about 70% of the solid matter in the primary sludge, so the primary sludge is very easy to become anaerobic and produce odor; in view of the above problems, Chinese patent CN117602785A discloses a sludge deodorization system, including a sludge deodorization bin and a negative pressure collection bin, the sludge deodorization bin is connected to the outer side of the negative pressure collection bin through a negative pressure gas collecting pipe, the sludge deodorization bin is rotatably connected to a placement cylinder on the upper part of the middle side, the placement cylinder is provided with stirring rods on the left and right sides, the stirring rod is fixedly provided with a fixed rod, the upper side of the fixed rod is fixedly connected with an incomplete gear, the two incomplete gears are meshed and connected with each other, and the middle side of the incomplete gear is fixedly connected with a fixed shaft, which solves the problem that the gas under the sludge is not easy to discharge in the prior art, causing the sludge to become smelly, it is inconvenient to stir the sludge, and the sludge deodorization effect is poor. However, the above prior art only discharges the malodorous gases that have been generated in the sludge, but the sludge will still continue to produce malodorous substances, and the problem of sludge odor generation has not been fundamentally solved, so a sludge deodorization system is urgently needed. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a sludge deodorization pretreatment system before filter pressing.

[0004] Technical solution: A sludge deodorization pretreatment system before filter pressing, comprising a stirring reactor, an agitator, a spray device, an oxygen spray device and a tail gas deodorization device; the agitator, the spray device, the oxygen spray device and the tail gas deodorization device are arranged inside the stirring reactor; the agitator is used to stir the sludge input into the stirring reactor; the spray device has a built-in odor purifier for spraying the odor purifier into the sludge; the oxygen spray device is used to transport oxygen-containing gas into the sludge; the tail gas deodorization device is used to treat the odor generated by the sludge during the reaction.

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

[0006] Preferably, 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, wherein 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 agent accounts for 0.2%-8% of the mass of the sludge, while the calcium-based 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 spraying device has two nozzles, which respectively spray a mixture of 5-15% by mass sodium hypochlorite solution and ferric chloride, calcium-based bentonite, potassium permanganate and Ti-containing blast furnace slag, and spray the agent once every 3-5 minutes.

[0008] Preferably, the oxygen spray device includes an oxygen gun, an oxygen supply pipeline, an air flow valve and a gas tank; two oxygen guns are arranged and symmetrically arranged on the same horizontal line with an angle of 40°-100°, the oxygen gun is a Laval type nozzle with 3 nozzles, the oxygen content of the gas in the gas tank is 10%-30%, the gas supply speed is 2-10L / min, and the gas is sprayed while the agitator is working.

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

[0010] Beneficial effects:

[0011] (1) The present invention sprays an odor purifier into the sludge. After the ferric chloride solution is added to the sludge, the entire sludge mixed system will be alkaline and the temperature will rise, so that the sludge is in an alkaline environment, thereby inhibiting the activity of bacteria, pathogens and odor substances in the sludge, and the ferric chloride can react with acidic gases (such as hydrogen sulfide, ammonia, etc.) in the sludge to form non-volatile salts. Calcium-based bentonite has a large specific surface area and a porous structure, and 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 and ammonia), thereby reducing the release of these gases and odor. The porous structure and large specific surface area of ​​blast furnace slag enable it to effectively adsorb odor molecules in the air. 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 oxidants that can oxidize organic matter in the sludge. These organic substances are often the main source of odor. Through oxidation reactions, organic matter is converted into odorless or low-odor compounds, thereby reducing odor. Sodium hypochlorite can release hypochlorous acid (HOCl) when it meets water in sludge. It has a strong bactericidal effect and can remove pathogenic microorganisms in water and sludge, reducing odor caused by microbial activity.

[0012] (2) The oxygen spraying device in the present invention 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 gases, and further improves the deodorization effect.

[0013] (3) The stirring device in the present invention can make the sludge fully react with oxygen and deodorant, thereby improving the deodorization efficiency.

[0014] (4) The mixed solid of calcium-based bentonite and Ti-containing blast furnace slag placed in the tail gas deodorization device of the present invention further deodorizes the tail gas, thereby meeting the emission standards. It not only solves the problem of sludge odor generation, but also purifies the tail gas generated during the reaction process, reducing the impact on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example

[0018] like Figure 1As shown, a sludge pre-filter deodorization pretreatment system is arranged 0.8-1.0m in front of the filter press, and the pretreatment system includes a stirring reactor with an agitator, a spraying device (with a built-in odor purifier) ​​and an oxygen spraying device, and a tail gas deodorization device (with a built-in 10-20Kg mixed solid of calcium-based bentonite and Ti-containing blast furnace slag, the ratio of which is 1:3). The stirring reactor and the tail gas deodorization device are both arranged on the ground, and the stirring reactor is connected to the spraying device, the oxygen spraying device and the tail gas deodorization device through a pipeline. A pressure valve is installed between the tail gas deodorization device and the stirring reactor, and the tail gas deodorization device has a built-in gas detector. When the sludge needs to be deodorized, the sludge is first transported to a stirring reactor, and the agitator in the stirring reactor starts to stir the sludge at a stirring speed of 30-150 rpm for 0.5-3 hours, and at the same time, two nozzles of the spraying device spray the odor purifier once every 3-5 minutes, and each spraying lasts for 10-20 seconds, and the total amount of the sprayed agent accounts for 0.2%-8% of the sludge mass. The odor purifier includes a sodium hypochlorite solution with a mass fraction of 5-15% and other four solid mixtures (calcium-based bentonite with a particle size of 100-200 meshes accounting for 0.2%-10% of the agent mass, Ti-containing blast furnace slag with a particle size of 50-100 meshes accounting for 20%-50% of the agent mass, ferric chloride accounting for 5-30% of the agent mass, and potassium permanganate accounting for 10-40% of the agent mass), which are sprayed by two nozzles respectively.

[0019] Then the oxygen spray device opens the air flow valve, and the gas with an oxygen content of 10-30% in the gas tank is transported to the sludge through the oxygen pipeline through two oxygen guns with three nozzles and symmetrically set at an angle of 40°-100° on the same horizontal line. The odor generated by the sludge in the reaction enters the deodorization device through the connecting pipe, and the deodorization device further processes the odor. When the detected gas reaches the emission standard, the gas is discharged.

[0020] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A sludge deodorization pretreatment system before filter pressing, characterized in that: It includes a stirring reactor, an agitator, a spraying device, an oxygen spraying device and an exhaust gas deodorizing device; the agitator, the spraying device and the oxygen spraying device are arranged inside the stirring reactor; the agitator is used to stir the sludge input into the stirring reactor; the spraying device has a built-in odor purifier, which is used to spray the odor purifier into the sludge; The oxygen injection device is used to deliver oxygen-containing gas into the sludge; The tail gas deodorization device is used to treat the odor generated by the sludge during the reaction.

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

3. The sludge deodorization pretreatment system before filter pressing according to claim 1 is characterized in that: The odor purifier includes ferric chloride, calcium-based bentonite, potassium permanganate, sodium hypochlorite solution with a mass fraction of 5-15% and Ti-containing blast furnace slag, wherein the particle size of the calcium-based bentonite is 100-200 meshes, and the particle size of the Ti-containing blast furnace slag is 50-100 meshes; the agent accounts for 0.2%-8% of the mass of the sludge, while the calcium-based 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.

4. The sludge deodorization pretreatment system before filter pressing according to claim 3 is characterized in that: The spraying device has two spray heads, which respectively spray a mixture of 5-15% sodium hypochlorite solution and ferric chloride, calcium-based bentonite, potassium permanganate and Ti-containing blast furnace slag, and spray the agent once every 3-5 minutes.

5. The sludge deodorization pretreatment system before filter pressing according to claim 1 is characterized in that: The oxygen spray device includes an oxygen gun, an oxygen supply pipeline, an air flow valve and a gas tank; two oxygen guns are arranged and symmetrically arranged on the same horizontal line with an angle of 40°-100°, the oxygen gun is a Laval type nozzle with 3 nozzles, the oxygen content of the gas in the gas tank is 10%-30%, the gas supply speed is 2-10L / min, and the jet is carried out while the agitator is working.

6. The sludge deodorization pretreatment system before filter pressing according to claim 1 is characterized in that: The tail gas deodorization device is built with 10-20 kg of mixed solids of calcium-based bentonite and Ti-containing blast furnace slag, with a ratio of 1:3.

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