Biological composite sludge conditioner and application method thereof

Abstract

The invention is applicable to the technical field of sewage treatment, and provides a biological composite sludge conditioner and an application method thereof, the biological composite sludge conditioner comprises a sludge decomposition component A, a sludge recombination component B and a sludge flocculation component C; the sludge decomposition component A comprises camphor, camphor wood oil, limonene, a flavonoid compound, tannin, eucalyptus oil and cineole; the sludge recombination component B comprises plant alkaloid; the sludge flocculation component C comprises mucus protein, polysaccharide substances and kaolin; preferably, the camphor and the camphor wood oil are from camphor tree leaves; the limonene and flavonoid compounds are derived from citrus leaves; the eucalyptus oil and the cineole are from eucalyptus leaves; the tannin is selected from citrus leaves and eucalyptus leaves; the plant alkaloid is selected from tea leaf powder, eggplant leaf powder and boxthorn leaf powder; the mucus protein and polysaccharide substances are from taro powder and Chinese yam powder. According to the scheme, resources can be recycled, secondary pollution is avoided, and environmental friendliness is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a biological composite sludge conditioner and an application method thereof. Background Art

[0002] In today's wastewater treatment industry, the effective treatment and disposal of sludge is a critical and challenging issue. As a byproduct of the wastewater treatment process, sludge not only produces large quantities of wastewater, but its complex physical and chemical properties also present numerous challenges for subsequent handling. Sludge conditioning and compression are crucial steps in the sludge treatment process, playing a crucial role in improving sludge dewatering performance, reducing sludge volume, and facilitating subsequent disposal.

[0003] Currently, chemical conditioning is one of the most widely used methods in sludge conditioning. Among them, the use of inorganic conditioning agents is a common method, such as iron salts (ferric sulfate, ferric chloride, etc.) and calcium salts (mainly calcium hydroxide), which are widely used in sludge conditioning.

[0004] Iron salts, a widely used sludge conditioner, offer certain advantages. They react chemically with colloidal substances in sludge, destabilizing the colloids through electrical neutralization, promoting agglomeration of sludge particles and improving sludge dewatering performance. Furthermore, during the reaction, iron salts form adsorbent iron hydroxides that absorb some organic matter and heavy metals in the sludge, reducing its polluting properties to a certain extent. However, the use of iron salts also has some drawbacks. For one thing, adding large amounts of iron salts can increase the difficulty of final sludge disposal by increasing the ash content. For another, while iron salts work best in acidic conditions, they tend to form precipitation in alkaline conditions, affecting the conditioning effect and potentially causing corrosion to equipment.

[0005] Calcium hydroxide is also widely used as a sludge conditioner. Its main advantages include adjusting the pH of sludge, creating an alkaline environment, inhibiting microbial activity, and reducing spoilage and odor generation during treatment. Furthermore, calcium hydroxide reacts with water in the sludge, generating heat that helps raise the sludge temperature and improves dewatering performance. Furthermore, calcium hydroxide reacts with heavy metals in the sludge to form stable compounds, reducing their mobility and bioavailability. However, the use of calcium hydroxide also has significant drawbacks. First, the addition of calcium hydroxide significantly increases the volume and weight of sludge due to its high density and the formation of calcium hydroxide hydrates upon reaction with water, which increases the burden on subsequent sludge transportation and disposal. Second, excessive use of calcium hydroxide can make the sludge excessively alkaline, potentially posing a risk to the environment and hindering its subsequent resource utilization.

[0006] In summary, existing sludge conditioners have some difficult-to-overcome shortcomings, failing to meet increasingly stringent environmental protection requirements and the practical needs of sludge treatment. Therefore, developing a new, highly effective sludge conditioner that can overcome the shortcomings of existing technologies and improve sludge treatment and disposal efficiency is of great practical significance and has broad application prospects. Summary of the Invention

[0007] The purpose of the present invention is to provide a biocomposite sludge conditioner and its application method to solve the problem that the agents used in the prior art sludge conditioners have some difficult-to-overcome shortcomings and cannot meet the increasingly stringent environmental protection requirements and the actual needs of sludge treatment.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: In a first aspect, the present invention provides a biological composite sludge conditioner, comprising a sludge decomposition component A, a sludge reorganization component B, and a sludge flocculation component C;

[0009] The components of the sludge decomposition component A include camphor, camphor oil, limonene, flavonoids, tannins, eucalyptus oil, and cineole;

[0010] The components of the sludge reconstitution component B include plant alkaloids;

[0011] The components of the sludge flocculation component C include mucus protein, polysaccharide substances and kaolin.

[0012] Preferably, the camphor and camphor oil come from camphor leaves; the limonene and flavonoids come from citrus leaves; the eucalyptus oil and cineole come from eucalyptus leaves; the tannins come from citrus leaves and eucalyptus leaves; the alkaloids come from tea leaf powder, eggplant leaf powder and wolfberry leaf powder; and the mucin and polysaccharides come from taro powder and yam powder.

[0013] Preferably, the mass fractions of each component in the sludge decomposition component A are 10-20 parts of camphor leaf powder, 10-20 parts of citrus leaf powder, and 5-10 parts of eucalyptus leaf powder;

[0014] The mass fractions of the components in the sludge recombinant component B are 10-20 parts of tea leaf powder, 5-10 parts of eggplant leaf powder, and 1-5 parts of wolfberry leaf powder;

[0015] The mass proportions of the components in the sludge flocculation component C are 1-5 parts of taro powder, 1-5 parts of yam powder, and 5-10 parts of kaolin.

[0016] The second aspect of the present invention provides a method for applying the biocomposite sludge conditioner according to the first aspect of the present invention, comprising the following steps:

[0017] S1, sludge decomposition:

[0018] Add sludge decomposition component A to the sludge-water mixture of the sewage treatment plant, stir it for the first time, adjust the pH to 6.0-9.0, let it stand for 3-4 hours at 20-38℃, then keep it at 0-20℃, let it stand for another 4-6 hours, and stir it again;

[0019] S2, sludge reorganization:

[0020] After the sludge decomposition is completed, add sludge reconstitution component B, adjust the pH to 6.0-9.0, and stir;

[0021] S3, sludge flocculation:

[0022] Add sludge flocculation component C, adjust the pH to 6.0-9.0, and stir to flocculate smaller sludge particles into larger ones;

[0023] S4, filter press dehydration:

[0024] Use a plate and frame filter press to filter and dehydrate. According to needs, control the pressure, time and moisture content of the filtration to obtain the corresponding product.

[0025] Preferably, the added amount of the sludge decomposition component A in S1 is 1‰-5‰ of the mass of the sludge-water mixture.

[0026] Preferably, the initial stirring speed in S1 is 120-160 rpm and the time is 30-60 min.

[0027] Preferably, the secondary stirring in S1 has a speed of 50-80 rpm and a time of 30-60 min.

[0028] Preferably, the addition amount of the sludge recombinant component B in the S2 is 2‰-10‰ of the mass of the sludge-water mixture; the stirring speed of the S2 is 30-60 rpm, and the stirring time is 30-60 min.

[0029] Preferably, the addition amount of the sludge flocculation component C in the S3 is 0.1‰-1‰ of the mass of the mud-water mixture; the stirring speed of the S3 is 20-40rpm, and the stirring time is 1-5min.

[0030] Preferably, the working pressure of the filter press in S4 is controlled at 0.5-1.0 MPa, the filter press time is 20-60 min, the moisture content of the sludge obtained by the filter press is below 40%, and the obtained product is used as a raw material for biofuel.

[0031] Preferably, the working pressure of the filter press in S4 is controlled at 0.2-0.5Mpa, the filter press time is 20-60min, the moisture content of the sludge filtered out is below 50%, and the obtained product is used as a raw material for bio-organic fertilizer, nutrient soil, soil improvement and repair.

[0032] The present invention has at least the following beneficial effects:

[0033] (1) The present invention provides a biocomposite sludge conditioner and its application method. The raw materials are all derived from plants, most of which are waste materials and are easy to obtain, which is a resource recycling;

[0034] (2) The biocomposite sludge conditioner and its application method provided by the present invention do not contain any chemical substances, are non-toxic and harmless to the environment, and do not cause secondary pollution;

[0035] (3) The present invention provides a biocomposite sludge conditioner and its application method. The dehydrated sludge does not contain pathogens such as pathogens, viruses, pests, etc. that are harmful to organisms, and is environmentally friendly.

[0036] (4) The present invention provides a biocomposite sludge conditioner and its application method. The dehydrated sludge has a high carbon content, low viscosity, is easy to be fluffy, and has wide resource utilization. DETAILED DESCRIPTION

[0037] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0038] Example 1

[0039] This embodiment provides a biocomposite sludge conditioner, which includes the following components:

[0040] ①. Sludge decomposition component A:

[0041] The sludge decomposition component A includes camphor leaf powder, eucalyptus leaf powder, and citrus leaf powder.

[0042] Dry the above leaves and grind them into 100-150 mesh powder. The proportion of each component by mass is as follows: 10-20 parts of camphor leaf powder, 10-20 parts of citrus leaf powder, and 5-10 parts of eucalyptus leaf powder, and mix them evenly.

[0043] The camphor and camphor oil in camphor leaves not only have an inhibitory and bactericidal effect on a variety of bacteria, fungi and viruses, but also have a killing effect on insects.

[0044] The limonene, flavonoids, tannins, etc. in citrus leaves have a killing effect on various bacteria, fungi and viruses, and have a preventive effect on many insects. They are natural insecticides.

[0045] Eucalyptus oil, cineole, tannins, etc. in eucalyptus leaves have strong antibacterial and bactericidal effects, which can destroy the cell membranes of microorganisms and inhibit their growth and reproduction.

[0046] The above leaf components are mixed together to inhibit the reproduction and kill the microorganisms in the sludge, and have a good inhibitory effect on the protozoa and metazoans in the sludge. They can decompose the flocs in the sludge, disintegrate the flocs, release the water in the flocs, and break up the microbial cells to release the water in the cells, thereby improving the dehydration efficiency of the sludge.

[0047] ②. Sludge recombinant component B:

[0048] The sludge recombinant component B includes tea leaf powder, eggplant leaf powder and wolfberry leaf powder.

[0049] The above three alkaloid-containing leaves are dried separately, crushed and ground into 100-150 mesh powder, and the components are configured in the following proportions by mass: 10-20 parts of tea leaf powder, 5-10 parts of eggplant leaf powder, and 1-5 parts of wolfberry leaf powder, and mixed and stirred evenly.

[0050] The leaves of the above three plants all contain alkaloids, which can change the charge of organic matter and have an adsorption effect, adsorbing the disintegrated free sludge together to form smaller sludge aggregates, further separating water from the sludge.

[0051] ③. Sludge flocculation component C:

[0052] Mix 1-5 parts of taro powder, 1-5 parts of yam powder and 5-10 parts of kaolin by mass and stir evenly.

[0053] Taro and yam contain mucus, the main components of which are mucus protein and polysaccharides, which have strong adsorption and flocculation properties; kaolin also has strong adsorption properties. The combination of the three substances has strong adsorption and flocculation properties, which can flocculate the reconstituted small sludge particles into large sludge particles, further separate the mud and water, and improve the dehydration effect.

[0054] Example 2

[0055] This embodiment provides an application method of a biological composite sludge conditioner, comprising the following steps:

[0056] The first step is sludge decomposition:

[0057] The activated sludge from the secondary sedimentation tank of a municipal sewage treatment plant is discharged into a sludge storage tank or sludge storage tank. At this point, the activated sludge is a mixture of mud and water with a high water content. Component A of the sludge conditioner is added at a rate of 1‰-5‰ and a stirring speed of 120-160rpm for 30-60 minutes to fully and evenly disperse the sludge conditioner component A into the mixture. The mixture is allowed to stand for 3-4 hours at a pH of 6.0-9.0 and at an air temperature of 20-38°C. The mixture is then allowed to stand for 4-6 hours at an air temperature of 0-20°C. The mixture is then stirred again at a rate of 50-80rpm for 30-60 minutes to completely decompose the flocs, shatter the microbial cells, and fully release the water within the flocs and cells.

[0058] The second step is sludge reorganization:

[0059] After the sludge is decomposed, add 2‰-10‰ of sludge conditioner component B to utilize the adsorption properties of the plant alkaloids in this component to reconstitute the decomposed sludge into smaller sludge aggregates. The pH is 6.0-9.0, the stirring speed is 30-60 rpm, and the stirring time is 30-60 minutes.

[0060] The third step is sludge flocculation:

[0061] Add 0.1‰-1‰ of sludge conditioner component C, pH 6.0-9.0, stirring speed 20-40rpm, stirring time 1-5min. This will cause smaller sludge particles to flocculate into larger ones, which is beneficial for sludge dewatering and filtration.

[0062] Step 4: filter press dehydration:

[0063] Use a plate and frame filter press to filter and dehydrate. According to the needs, control the pressure, time and moisture content of the filtration to obtain the corresponding product:

[0064] When the working pressure is controlled at 0.5-1.0Mpa and the filtration time is 20-60min, the moisture content of the sludge filtered out is below 40%, the sludge has low viscosity but is not easy to loosen, and the obtained product is suitable for use as a raw material for biofuel.

[0065] When the working pressure is controlled at 0.2-0.5Mpa and the filtration time is 20-60min, the moisture content of the sludge filtered out is below 50%, the sludge has low viscosity and is easy to loosen. The obtained product is suitable for use as raw materials for bio-organic fertilizer, nutrient soil, soil improvement and remediation, etc.

[0066] Example 3

[0067] This example provides a case study of the application of a biocomposite sludge conditioner to slaughterhouse wastewater:

[0068] Sludge thickening tank for slaughterhouse wastewater, mud-water mixture is 50m 3 .

[0069] Step 1: Sludge decomposition

[0070] The addition amount of sludge conditioning component A is 0.15m 3 The sludge conditioner component A was fully and evenly dispersed in the sludge-water mixture at a stirring speed of 140 rpm for 50 minutes. After uniform stirring, the pH reached 7.1 and the local temperature was 15-31°C. After standing for 3 hours, the mixture was stirred at a stirring speed of 70 rpm for 50 minutes to completely decompose the floccules, break up the microbial cells, and fully release the water in the floccules and cells.

[0071] Step 2: Sludge Reconstitution

[0072] After the sludge decomposition is completed, add 0.25m of sludge conditioner component B 3 The adsorption properties of the plant alkaloids in this component are used to reconstitute the decomposed sludge into smaller sludge aggregates. The pH is 7.6, the stirring speed is 40 rpm, and the stirring time is 30 minutes.

[0073] Step 3: Sludge flocculation

[0074] Add sludge conditioner component C 0.01m 3 , pH 7.6, stirring speed 30 rpm, stirring time 2 min. The smaller sludge particles are flocculated into larger sludge particles, which is beneficial to the sludge dewatering by pressure filtration.

[0075] Step 4: Filter Press Dehydration

[0076] The sludge was filtered and dehydrated using a plate and frame filter press, with the operating pressure controlled at 1.0 MPa and the filtration time at 30 minutes. The sludge obtained by filtration had a moisture content of 35%, low viscosity, and was not easy to loosen, making it suitable for use as a raw material for biofuels.

[0077] Example 4

[0078] This example provides a case study of the application of a biocomposite sludge conditioner in petroleum wastewater:

[0079] The petroleum wastewater biochemical system discharges sludge into the sludge concentration tank. The sludge volume in the tank is 100m 3 The sludge in the biochemical pool is relatively fine and contains a certain amount of oil. Therefore, the sludge after filtration has a certain viscosity and is not easy to loosen, making it suitable as a raw material for biofuel. The specific parameters are as follows:

[0080]

[0081] The above shows and describes the basic principles, main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and all variations that come within the meaning and range of equivalents of the claims are intended to be included therein.

[0082] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A biological composite sludge conditioner, characterized in that: Including sludge decomposition component A, sludge reorganization component B and sludge flocculation component C; The components of the sludge decomposition component A include camphor, camphor oil, limonene, flavonoids, tannins, eucalyptus oil, and cineole; The components of the sludge reconstitution component B include plant alkaloids; The components of the sludge flocculation component C include mucus protein, polysaccharide substances and kaolin.

2. A biological composite sludge conditioner according to claim 1, characterized in that: The camphor and camphor oil come from camphor leaves; the limonene and flavonoids come from citrus leaves; the eucalyptus oil and cineole come from eucalyptus leaves; the tannins come from citrus leaves and eucalyptus leaves; the alkaloids come from tea leaf powder, eggplant leaf powder and wolfberry leaf powder; and the mucin and polysaccharides come from taro powder and yam powder.

3. A biological composite sludge conditioner according to claim 2, characterized in that: The mass fractions of each component in the sludge decomposition component A are 10-20 parts of camphor leaf powder, 10-20 parts of citrus leaf powder, and 5-10 parts of eucalyptus leaf powder; The mass fractions of the components in the sludge recombinant component B are 10-20 parts of tea leaf powder, 5-10 parts of eggplant leaf powder, and 1-5 parts of wolfberry leaf powder; The mass proportions of the components in the sludge flocculation component C are 1-5 parts of taro powder, 1-5 parts of yam powder, and 5-10 parts of kaolin.

4. A method for using the biocomposite sludge conditioner according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, sludge decomposition: Add sludge decomposition component A to the sludge-water mixture of the sewage treatment plant, stir it for the first time, adjust the pH to 6.0-9.0, let it stand for 3-4 hours at 20-38℃, then keep it at 0-20℃, let it stand for another 4-6 hours, and stir it again; S2, sludge reorganization: After the sludge decomposition is completed, add sludge reconstitution component B, adjust the pH to 6.0-9.0, and stir; S3, sludge flocculation: Add sludge flocculation component C, adjust the pH to 6.0-9.0, and stir to flocculate smaller sludge particles into larger ones; S4, filter press dehydration: Use a plate and frame filter press to filter and dehydrate. According to needs, control the pressure, time and moisture content of the filtration to obtain the corresponding product.

5. The method according to claim 4, characterized in that: The amount of sludge decomposition component A added in S1 is 1‰-5‰ of the mass of the sludge-water mixture; the initial stirring speed in S1 is 120-160 rpm, and the time is 30-60 min.

6. The method according to claim 4, characterized in that: The secondary stirring in S1 is performed at a speed of 50-80 rpm and for a time of 30-60 min.

7. The method according to claim 4, characterized in that: The amount of sludge recombinant component B added to the S2 is 2‰-10‰ of the mass of the sludge-water mixture; the stirring speed of the S2 is 30-60 rpm, and the stirring time is 30-60 min.

8. The method according to claim 4, characterized in that: The amount of the sludge flocculation component C added to the S3 is 0.1‰-1‰ of the mass of the sludge-water mixture; the stirring speed of the S3 is 20-40rpm, and the stirring time is 1-5min.

9. The method according to claim 4, characterized in that: The working pressure of the filter press in S4 is controlled at 0.5-1.0 MPa, the filter press time is 20-60 min, the moisture content of the sludge filtered out is below 40%, and the obtained product is used as a raw material for biofuel.

10. The method according to claim 4, characterized in that: The working pressure of the filter press in S4 is controlled at 0.2-0.5Mpa, the filter press time is 20-60min, the moisture content of the sludge filtered out is below 50%, and the obtained product is used as raw material for bio-organic fertilizer, nutrient soil, soil improvement and repair.

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