Conditioner for deep dehydration of sludge as well as preparation method and application of conditioner

Abstract

The invention provides a conditioner for deep dehydration of sludge as well as a preparation method and application of the conditioner, and belongs to the technical field of sludge treatment. The conditioner for deep dehydration of the sludge, provided by the invention, is prepared from the following components in parts by mass: 5 to 10 parts of persulfate, 23 to 35 parts of composite flocculant, 3 to 12 parts of activated carbon, 7 to 16 parts of poly dimethyl diallyl ammonium chloride, 4 to 11 parts of bentonite, 12 to 23 parts of zeolite and 5 to 8 parts of fiber, the composite flocculant comprises polyaluminum chloride and polyferric chloride. Results of the embodiment show that after the conditioner for deep dehydration of the sludge provided by the invention is used for dehydrating the sludge, when the addition amount of the conditioner for deep dehydration of the sludge is 1-8%, the moisture content of the sludge can be reduced to 45.8% at most, and meanwhile, the peculiar smell can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and particularly relates to a conditioner for deep dewatering of sludge, a preparation method thereof, and an application thereof. Background Art

[0002] With the development of urbanization, the increase in population, and the rapid development of industrialization, the discharge of urban domestic sewage and industrial sewage is increasing day by day, thus increasing the output of sludge, a by-product generated in sewage treatment. Sludge has the characteristics of "four highs": one is high water content; the second is high organic matter content, which is very easy to rot and stink; the third is relatively high heavy metal content; the fourth is high pathogen content, containing a large number of bacteria, parasites, and viruses. If sludge is not treated harmlessly and is discarded or simply landfilled at will, it is very easy to pollute the air, soil, and water source, seriously threatening human health and environmental safety. Therefore, how to treat sludge has become an inescapable problem in social development.

[0003] Currently, the main methods for sludge treatment are landfill, composting, and incineration. However, since sludge contains a large amount of water and acidic components, if directly treated, it will not only greatly increase energy consumption, but also the acid solution will corrode the equipment, causing equipment damage and reduced service life, thus greatly increasing the treatment cost. In order to facilitate the effective progress of subsequent treatment, it is necessary to condition and dewater the sludge. Sludge with high water content first needs to add sludge dewatering agents and cooperate with mechanical dewatering to accelerate the removal of interstitial water in the sludge. The factors affecting the sludge dewatering performance mainly include the size and distribution of sludge particles, surface charge, degree of hydration, and interaction between particles. Among them, the size of sludge particles is the most important factor affecting the sludge dewatering performance, because the smaller the sludge particles, the larger the specific surface area of the particles, which means a higher degree of hydration, a greater resistance to filtration, and more agents are required to change the sludge dewatering performance.

[0004] Currently, most of the conditioners used for sludge dewatering are flocculants, including inorganic flocculants (aluminum salts and iron salts), organic flocculants (PAM), and microbial flocculants, etc. Flocculants can react chemically on the surface of sludge colloidal particles and neutralize the charges of sludge colloidal particles, thereby promoting the aggregation of sludge particles into large granular flocs, and at the same time separating water from the sludge particles, thereby improving the dewatering performance of the sludge. However, in the treatment process, the dosage of flocculants is large and the cost is high. Therefore, providing a conditioner with low cost and effective in improving the sludge dewatering performance has become an urgent technical problem in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a conditioner for deep dewatering of sludge, a preparation method thereof, and an application thereof. The conditioner for deep dewatering of sludge provided by the present invention has a low dosage, good dewatering effect on sludge, and can reduce odor at the same time.

[0006] To achieve the above-mentioned invention objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a conditioner for deep dewatering of sludge, which comprises the following components by mass parts: 5-10 parts of persulfate, 23-35 parts of composite flocculant, 3-12 parts of activated carbon, 7-16 parts of polydimethyldiallylammonium chloride, 4-11 parts of bentonite, 12-23 parts of zeolite and 5-8 parts of fiber;

[0008] The composite flocculant comprises polyaluminum chloride and polyferric chloride.

[0009] Preferably, the persulfate is ammonium persulfate, sodium persulfate or potassium persulfate.

[0010] Preferably, the mass ratio of polyaluminum chloride to polyferric chloride is 1:(1-5).

[0011] Preferably, the particle size of the activated carbon is 20-40 mesh.

[0012] Preferably, the molecular weight of the polydimethyldiallylammonium chloride is 4×10 4 ~3×10 6 .

[0013] Preferably, the particle size of the zeolite is 4-8 mm.

[0014] Preferably, the fiber comprises coconut fiber or cotton fiber; the size of the fiber is 6-25 mm.

[0015] The present invention provides a preparation method of the conditioner for deep dewatering of sludge described in the above technical solutions, which comprises: mixing persulfate, composite flocculant, activated carbon, bentonite, zeolite and fiber, and then adding polydimethyldiallylammonium chloride for mixing to obtain the conditioner for deep dewatering of sludge.

[0016] The present invention provides an application of the conditioner for deep dewatering of sludge described in the above technical solutions or the conditioner for deep dewatering of sludge prepared by the preparation method described in the above technical solutions in the conditioning of deep dewatering of sludge.

[0017] Preferably, the dosage of the conditioner for deep dewatering of sludge is 1-8% of the mass of the sludge.

[0018] The present invention provides a conditioner for deep dewatering of sludge. By mass fraction, it comprises the following components: 5 - 10 parts of persulfate, 23 - 35 parts of composite flocculant, 3 - 12 parts of activated carbon, 7 - 16 parts of polydimethyldiallylammonium chloride, 4 - 11 parts of bentonite, 12 - 23 parts of zeolite, and 5 - 8 parts of fiber; the composite flocculant comprises polyaluminum chloride and polyferric chloride. By adding persulfate with strong oxidizing property, the extracellular polymer of bacteria can be cracked, thereby killing bacteria, reducing bacterial contamination, and promoting the sludge cell wall breaking effect. It can disperse sludge flocs, destroy the floc structure, improve the subsequent dewatering effect. At the same time, in combination with the composite flocculant, activated carbon and zeolite, bacteria can be adsorbed, reducing the odor in the air and the pollution degree of the water quality after dewatering, which is convenient for subsequent treatment; using the composite flocculant composed of polyaluminum chloride and polyferric chloride for dewatering, compared with a single type of flocculant, it still has a good flocculation effect even under the conditions of low temperature and low turbidity, and can effectively separate sludge from water, further improving the dewatering effect; polydimethyldiallylammonium chloride can make the fine particles in the sludge coagulate and destabilize and convert the surface-attached water into free water, thereby reducing the water content in the sludge; at the same time, polydimethyldiallylammonium chloride and fiber can play a synergistic role, aggregating the particles in the sludge through the enmeshment effect, which is beneficial to the separation of free water; bentonite and zeolite can play a synergistic role, improving the stability of the treated sludge and adsorbing the heavy metal components in the sludge, reducing heavy metal pollution. The results of the examples show that after the conditioner for deep dewatering of sludge provided by the present invention is used for dewatering treatment of sludge, when the addition amount of the conditioner for deep dewatering of sludge is 1 - 8%, the water content of the sludge can be reduced to about 47% at most, and at the same time, the odor can be reduced. Detailed Embodiments

[0019] The present invention provides a conditioner for deep dewatering of sludge. By mass fraction, it comprises the following components: 5 - 10 parts of persulfate, 23 - 35 parts of composite flocculant, 3 - 12 parts of activated carbon, 7 - 16 parts of polydimethyldiallylammonium chloride, 4 - 11 parts of bentonite, 12 - 23 parts of zeolite, and 5 - 8 parts of fiber;

[0020] The composite flocculant comprises polyaluminum chloride and polyferric chloride.

[0021] In the present invention, unless otherwise specified, the raw materials used in the conditioner for deep dewatering of sludge provided by the present invention are all commercially available products well-known to those skilled in the art.

[0022] By mass parts, the conditioner for deep dewatering of sludge provided by the present invention comprises 5 - 10 parts of persulfate; the persulfate is preferably ammonium persulfate, sodium persulfate or potassium persulfate, and preferably sodium persulfate. As an embodiment of the present invention, the mass parts of the persulfate can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts. By adding persulfate, since persulfate has strong oxidizing property, it can crack the extracellular polymers of bacteria, thereby killing bacteria, reducing bacterial contamination, and promoting the sludge wall-breaking effect. It can disperse sludge flocs, destroy the floc structure, improve the subsequent dewatering effect, and at the same time cooperate with the composite flocculant, activated carbon and zeolite to adsorb bacteria, reduce the odor in the air and the pollution degree of the water quality after dewatering, facilitating subsequent treatment.

[0023] By taking the mass parts of persulfate as 5 - 10 parts, the conditioner for deep dewatering of sludge provided by the present invention comprises 23 - 35 parts of composite flocculant; the composite flocculant comprises polyaluminum chloride and polyferric chloride; the mass ratio of the polyaluminum chloride to the polyferric chloride is preferably 1:(1 - 5). As an embodiment of the present invention, the mass parts of the composite flocculant can be 23 parts, 25 parts, 28 parts, 30 parts, 32 parts or 35 parts; the mass ratio of the polyaluminum chloride to the polyferric chloride can be 1:(2 - 4), and can also be 1:(3 - 4). In the present invention, the flocculant can undergo a chemical reaction on the surface of sludge colloidal particles and neutralize the charges of the sludge colloidal particles, thereby promoting the aggregation of sludge particles into large granular flocs, and at the same time separating water from the sludge particles, thereby improving the dewatering performance of the sludge; by using the composite flocculant composed of polyaluminum chloride and polyferric chloride for dewatering in the present invention, compared with a single type of flocculant, it still has a good flocculation effect even under low-temperature and low-turbidity conditions, can effectively separate the sludge from the water, and further improve the dewatering effect.

[0024] By taking the mass parts of persulfate as 5 - 10 parts, the conditioner for deep dewatering of sludge provided by the present invention comprises 3 - 12 parts of activated carbon; the particle size of the activated carbon is preferably 20 - 40 mesh. As an embodiment of the present invention, the mass parts of the activated carbon can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts or 12 parts. By adding a small amount of activated carbon as an adsorption material, since the activated carbon has a large specific surface area and good adsorption performance, it can effectively adsorb the fine particles, bacteria, eggs and other components in the sludge, and further improve the treatment effect of the sludge.

[0025] By taking the mass parts of persulfate as 5 - 10 parts, the conditioner for deep dewatering of sludge provided by the present invention comprises 7 - 16 parts of polydimethyldiallylammonium chloride; the molecular weight of the polydimethyldiallylammonium chloride is preferably 4×10 4 ~3×10 6. As an embodiment of the present invention, the mass fraction of the polydimethyldiallylammonium chloride may be 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts or 16 parts; the molecular weight of the polydimethyldiallylammonium chloride may be 6×10 4 ~2×10 6 , and may also be 1×10 5 ~1×10 6 . In the present invention, the polydimethyldiallylammonium chloride can reduce the surface charge of the sludge colloid ions by means of electro-neutralization, thereby reducing the adsorption performance of its colloid particles. During the compression process, the fine particles in the sludge can be coagulated and destabilized, and the surface-attached water can be converted into free water, thereby reducing the water content in the sludge; at the same time, the polydimethyldiallylammonium chloride belongs to a linear polymer, which can play the roles of adhesion bridging, net trapping and sweeping during the sludge treatment process, thereby aggregating the tiny sludge particles and improving the sludge sedimentation performance and further enhancing the sludge dewatering performance.

[0026] Calculated based on the mass fraction of the persulfate being 5 to 10 parts, the conditioner for deep sludge dewatering provided by the present invention includes 4 to 11 parts of bentonite. As an embodiment of the present invention, the mass fraction of the bentonite may be 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts or 11 parts. By adding a certain amount of bentonite, the present invention can significantly improve the strength of the sludge solidified body, making the treated sludge more stable and not easily broken; at the same time, bentonite can enhance the stability of heavy metals such as lead and zinc in the sludge, prevent the leakage of these harmful substances, and reduce the potential threat to the environment.

[0027] Calculated based on the mass fraction of the persulfate being 5 to 10 parts, the conditioner for deep sludge dewatering provided by the present invention includes 12 to 23 parts of zeolite; the particle size of the zeolite is preferably 4 to 8 mm. As an embodiment of the present invention, the mass fraction of the zeolite may be 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts or 23 parts. In the present invention, the zeolite particles have a certain charge-neutralizing effect, can play a certain flocculation role in the sludge, and form a framework for supporting the flocculation particles; at the same time, the zeolite has a relatively large pore structure, which can play a role in assisting filtration and dewatering, and can adsorb bacteria and organic substances during this process, thereby playing a deodorizing role.

[0028] Based on the mass fraction of persulfate being 5 - 10 parts, the conditioner for deep dewatering of sludge provided by the present invention includes 5 - 8 parts of fiber; the fiber preferably includes coconut fiber or cotton fiber; the size of the fiber is preferably 6 - 25 mm. As an implementation manner of the present invention, the mass fraction of the fiber can be 5 parts, 6 parts, 7 parts or 8 parts; the size of the fiber can be 8 - 20 mm. By adding a small amount of fiber with a longer size in the process of treating sludge, it can play a role of net trapping, aggregating the particles in the sludge, which is beneficial to the separation of free water.

[0029] By adding persulfate with strong oxidizing property, the present invention can crack the extracellular polymers of bacteria, thereby killing bacteria, reducing bacterial contamination, and promoting the sludge wall-breaking effect. It can disperse sludge flocs, destroy the floc structure, and improve the subsequent dewatering effect. At the same time, cooperating with a composite flocculant, activated carbon and zeolite can adsorb bacteria and organic matters, thereby reducing the odor in the air and the pollution degree of the water quality after dewatering, which is convenient for subsequent treatment; using a composite flocculant composed of polyaluminum chloride and polyferric chloride for dewatering, compared with a single type of flocculant, it still has a good flocculation effect even under the conditions of low temperature and low turbidity, can effectively separate sludge from water, and further improve the dewatering effect; poly(dimethyldiallylammonium chloride) can make the fine particles in the sludge coagulate and destabilize and convert the surface-attached water into free water, thereby reducing the water content in the sludge; at the same time, poly(dimethyldiallylammonium chloride) and fiber can play a synergistic role, aggregating the particles in the sludge through net trapping, which is beneficial to the separation of free water; bentonite and zeolite can play a synergistic role, improving the stability of the treated sludge and adsorbing heavy metal components in the sludge, reducing heavy metal pollution.

[0030] The present invention also provides a preparation method of the conditioner for deep dewatering of sludge described in the above technical solution, including: mixing persulfate, composite flocculant, activated carbon, bentonite, zeolite and fiber, and then adding poly(dimethyldiallylammonium chloride) for mixing to obtain the conditioner for deep dewatering of sludge.

[0031] The present invention has no special limitation on the specific method of mixing the persulfate, composite flocculant, activated carbon, bentonite, zeolite and fiber, as long as they can be mixed evenly.

[0032] The preparation method provided by the present invention is simple. Since poly(dimethyldiallylammonium chloride) has a certain viscosity, it can bond other components well together to avoid dispersion. At the same time, poly(dimethyldiallylammonium chloride) has good water solubility, and adding it to the sludge can quickly dissolve in water, so that other components can be evenly dispersed in the sludge and play their roles.

[0033] The present invention also provides an application, including: using the conditioning agent for deep sludge dewatering described in the above technical solution or the conditioning agent for deep sludge dewatering prepared by the preparation method described in the above technical solution to conduct deep dewatering conditioning on sludge, and then performing pressure filtration to obtain the deeply dewatered sludge.

[0034] In the present invention, the dosage of the conditioning agent for deep sludge dewatering is preferably 1-8% of the sludge mass. As an implementation manner of the present invention, the dosage of the conditioning agent for deep sludge dewatering can be 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8% of the sludge mass.

[0035] The conditioning agent for deep sludge dewatering provided by the present invention has a small dosage during sludge treatment and good sludge dewatering effect.

[0036] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Example 1

[0038] A conditioning agent for deep sludge dewatering, by mass parts, consists of the following components: 5 parts of ammonium persulfate, 30 parts of composite flocculant, 6 parts of activated carbon, 8 parts of polydimethyldiallylammonium chloride, 5 parts of bentonite, 16 parts of zeolite and 6 parts of fiber;

[0039] The composite flocculant is polyaluminum chloride and polyferric chloride, and the mass ratio of polyaluminum chloride to polyferric chloride is 1:2; the particle size of the activated carbon is 20-40 mesh; the molecular weight of the polydimethyldiallylammonium chloride is 1×10 5 ~1×10 6 ; the particle size of the zeolite is 4-8 mm; the fiber is coconut fiber, and the size of the fiber is 6-25 mm.

[0040] The preparation method of the conditioning agent for deep sludge dewatering is: mixing ammonium persulfate, composite flocculant, activated carbon, bentonite, zeolite and fiber and stirring evenly, and then adding polydimethyldiallylammonium chloride and stirring evenly to obtain the conditioning agent for deep sludge dewatering.

[0041] Example 2

[0042] The mass ratio of polyaluminum chloride to polyferric chloride is 1:3, and other conditions are the same as those in Example 1.

[0043] Example 3

[0044] The mass ratio of polyaluminum chloride to polyferric chloride is 1:5, and other conditions are the same as those in Example 1.

[0045] Comparative Example 1

[0046] A conditioner for deep dewatering of sludge, by mass, consists of the following components: 5 parts of ammonium persulfate, 25 parts of a flocculant, 6 parts of activated carbon, 8 parts of polydimethyldiallylammonium chloride, 5 parts of bentonite, 16 parts of zeolite, and 6 parts of fiber; the flocculant is polyaluminum chloride, and other conditions are the same as those in Example 1.

[0047] Comparative Example 2

[0048] A conditioner for deep dewatering of sludge, by mass, consists of the following components: 5 parts of ammonium persulfate, 25 parts of a flocculant, 6 parts of activated carbon, 8 parts of polydimethyldiallylammonium chloride, 5 parts of bentonite, 16 parts of zeolite, and 6 parts of fiber; the flocculant is polyferric chloride, and other conditions are the same as those in Example 1.

[0049] Application Examples 1 - 3 and Comparative Application Examples 1 - 2

[0050] Take the same batch of sludge. After measurement, the moisture content of the sludge is 96.2%. Divide it into five equal parts, and then add the conditioners for deep dewatering of sludge provided in Examples 1 - 3 and Comparative Examples 1 - 2 respectively. The dosage of the conditioner for deep dewatering of sludge is 4% of the sludge mass. Stir at a speed of 150 r / min for 10 min, and then feed it into a diaphragm plate and frame filter press for pressure filtration. The pressing pressure is 10 MPa. After the pressure filtration is completed, measure the moisture content in the sludge. The obtained results correspond to Application Examples 1 - 3 and Comparative Application Examples 1 - 2 in sequence, and the results are shown in Table 1:

[0051] Table 1 Moisture content of sludge obtained from Application Examples 1 - 3 and Comparative Application Examples 1 - 2

[0052] Example Moisture content of sludge after deep dehydration / % Application Example 1 56.6 Application Example 2 55.4 Application Example 3 55.7 Comparative Application Example 1 67.4 Comparative Application Example 2 63.6

[0053] As can be seen from Table 1, when using a composite flocculant, compared with using a single polyferric chloride or polyaluminum chloride as the flocculant, the moisture content of the sludge after deep dewatering is significantly better. This shows that the use of the composite flocculant in the present invention can achieve a better dehydration effect, proving that there is a good synergistic effect when polyferric chloride and polyaluminum chloride are used in combination.

[0054] Example 4

[0055] A conditioner for deep dewatering of sludge, by mass, consists of the following components: 7 parts of sodium persulfate, 25 parts of a composite flocculant, 8 parts of activated carbon, 7 parts of polydimethyldiallylammonium chloride, 6 parts of bentonite, 12 parts of zeolite, and 5 parts of fiber;

[0056] The composite flocculant is polyaluminum chloride and polyferric chloride, and the mass ratio of polyaluminum chloride to polyferric chloride is 1:3; the particle size of the activated carbon is 20 - 40 mesh; the molecular weight of the poly(dimethyldiallylammonium chloride) is 1×10 5 ~1×10 6 ; the particle diameter of the zeolite is 4 - 8 mm; the fiber is coconut fiber, and the size of the fiber is 6 - 25 mm.

[0057] The preparation method of the conditioner for deep dewatering of sludge is as follows: Mix persulfate, composite flocculant, activated carbon, bentonite, zeolite and fiber evenly by stirring, and then add poly(dimethyldiallylammonium chloride) and stir evenly to obtain the conditioner for deep dewatering of sludge.

[0058] Example 5

[0059] The dosage of the composite flocculant is 30 parts, and other conditions are the same as those in Example 4.

[0060] Example 6

[0061] The dosage of the composite flocculant is 35 parts, and other conditions are the same as those in Example 4.

[0062] Comparative Example 3

[0063] The dosage of the composite flocculant is 5 parts, and other conditions are the same as those in Example 4.

[0064] Comparative Example 4

[0065] The dosage of the composite flocculant is 60 parts, and other conditions are the same as those in Example 4.

[0066] Application Examples 4 - 6 and Comparative Application Examples 3 - 4

[0067] The test methods and test conditions of Application Examples 4 - 6 and Comparative Application Examples 3 - 4 are the same as those of Application Example 1.

[0068] After the deep dewatering treatment of Application Examples 4 - 6 and Comparative Application Examples 3 - 4, the moisture content of the sludge is shown in Table 2:

[0069] Table 2 Moisture content of sludge obtained from Application Examples 4 - 6 and Comparative Application Examples 3 - 4

[0070] Example Moisture content of sludge after deep dehydration / % Application Example 4 56.2 Application Example 5 55.8 Application Example 6 55.6 Comparative Application Example 3 71.5 Comparative Application Example 4 62.3

[0071] As can be seen from Table 2, when the dosage of the conditioner for deep sludge dewatering remains unchanged, with the increase of the composite flocculant in the conditioner for deep sludge dewatering, the moisture content of the dewatered sludge shows a slight decrease, indicating that appropriately increasing the dosage of the composite flocculant can improve the dewatering effect of the conditioner for deep sludge dewatering; by comparing the data of Application Examples 3-4, it can be seen that when the dosage of the composite flocculant drops significantly, the dewatering effect of the conditioner for deep sludge dewatering also drops significantly, but when the dosage of the composite flocculant increases significantly, the dewatering effect of the conditioner for deep sludge dewatering also shows a downward trend. This is because when the dosage of the conditioner for deep sludge dewatering is the same, the higher the dosage of the composite flocculant, the lower the relative dosage of other components, which will instead affect the dewatering effect of the conditioner for deep sludge dewatering.

[0072] Example 7

[0073] A conditioner for deep sludge dewatering, by mass, consists of the following components: 7 parts of sodium persulfate, 30 parts of composite flocculant, 8 parts of activated carbon, 9 parts of polydimethyldiallylammonium chloride, 7 parts of bentonite, 13 parts of zeolite and 5 parts of fiber;

[0074] The composite flocculant is polyaluminum chloride and polyferric chloride, and the mass ratio of polyaluminum chloride to polyferric chloride is 1:3; the particle size of the activated carbon is 20-40 mesh; the molecular weight of the polydimethyldiallylammonium chloride is 1×10 5 ~1×10 6 ; the particle size of the zeolite is 4-8 mm; the fiber is coconut fiber, and the size of the fiber is 6-25 mm.

[0075] The preparation method of the conditioner for deep sludge dewatering is: mix sodium persulfate, composite flocculant, activated carbon, bentonite, zeolite and fiber and stir evenly, then add polydimethyldiallylammonium chloride and stir evenly to obtain the conditioner for deep sludge dewatering.

[0076] Example 8

[0077] The dosage of sodium persulfate is 10 parts, and other conditions are the same as those in Example 7.

[0078] Comparative Example 5

[0079] The dosage of sodium persulfate is 0 part, and other conditions are the same as those in Example 7.

[0080] Application Examples 7-8 and Comparative Application Example 5

[0081] The test methods and test conditions of Application Examples 7-8 and Comparative Application Example 5 are the same as those in Application Example 1.

[0082] The moisture content of the sludge after deep dehydration in Application Examples 7 - 8 and Comparative Application Example 5 is shown in Table 3 as follows:

[0083] Table 3 Moisture content of the sludge obtained in Application Examples 7 - 8 and Comparative Application Example 5

[0084] Example Moisture content of sludge after deep dehydration / % Application Example 7 56.1 Application Example 8 54.3 Comparative Application Example 5 76.8

[0085] As can be seen from Table 3, after omitting the addition of sodium persulfate, the dehydration effect of the conditioner for deep sludge dehydration drops significantly, indicating that persulfate has a good effect on improving the dehydration efficiency of the conditioner for deep sludge dehydration.

[0086] Example 9

[0087] The dosage of activated carbon is 12 parts, and other conditions are the same as those in Example 7.

[0088] Comparative Example 6

[0089] The dosage of activated carbon is 0 part, and other conditions are the same as those in Example 7.

[0090] Application Example 9 and Comparative Application Example 6

[0091] The testing methods and conditions of Application Example 9 and Comparative Application Example 6 are the same as those of Application Example 1.

[0092] The moisture content of the sludge after deep dehydration in Application Example 9 and Comparative Application Example 6 is shown in Table 4 as follows:

[0093] Table 4 Moisture content of the sludge obtained in Application Example 9 and Comparative Application Example 6

[0094] Example Moisture content of sludge after deep dehydration / % Application Example 9 56.9 Comparative Application Example 6 63.7

[0095] As can be seen from Table 4, after omitting the addition of activated carbon, the influence on the dehydration effect of the conditioner for deep sludge dehydration is relatively small. However, through the inventor's observation, it is found that after adding activated carbon for treatment, the peculiar smell emitted by the sludge after deep dehydration decreases significantly, indicating that activated carbon can adsorb bacteria and other pungent odors in the sludge.

[0096] Example 10

[0097] The dosage of polydimethyldiallylammonium chloride is 13 parts, and other conditions are the same as those in Example 7.

[0098] Example 11

[0099] The dosage of polydimethyldiallylammonium chloride is 16 parts, and other conditions are the same as those in Example 7.

[0100] Comparative Example 7

[0101] The dosage of polydimethyldiallylammonium chloride is 0 part, and other conditions are the same as those in Example 7.

[0102] Application Examples 10 - 11 and Comparative Application Example 7

[0103] The test methods and test conditions of Application Examples 10 - 11 and Comparative Application Example 7 are the same as those in Application Example 1.

[0104] After deep dehydration treatment, the moisture content of the sludge in Application Examples 10 - 11 and Comparative Application Example 7 is shown in Table 5:

[0105] Table 5 Moisture content of the sludge obtained in Application Examples 10 - 11 and Comparative Application Example 7

[0106] Example Moisture content of sludge after deep dehydration / % Application Example 10 53.9 Application Example 11 52.4 Comparative Application Example 7 76.4

[0107] It can be seen from Table 5 that after omitting the addition of polydimethyldiallylammonium chloride, the dehydration effect of the conditioner for deep sludge dehydration drops significantly. Meanwhile, within a suitable range, the dehydration effect of the conditioner for deep sludge dehydration increases moderately with the increase in the dosage of polydimethyldiallylammonium chloride, indicating that the dehydration effect of the conditioner for deep sludge dehydration can be significantly improved by adding polydimethyldiallylammonium chloride in the present invention.

[0108] Application Example 12

[0109] The dosage of the conditioner for deep sludge dehydration is 1% of the sludge mass, and other conditions are the same as those in Application Example 1.

[0110] Application Example 13

[0111] The dosage of the conditioner for deep sludge dehydration is 2% of the sludge mass, and other conditions are the same as those in Application Example 1.

[0112] Application Example 14

[0113] The dosage of the conditioner for deep sludge dehydration is 6% of the sludge mass, and other conditions are the same as those in Application Example 1.

[0114] Application Example 15

[0115] The dosage of the conditioner for deep sludge dehydration is 8% of the sludge mass, and other conditions are the same as those in Application Example 1.

[0116] Comparative Application Example 8

[0117] The dosage of the conditioner for deep sludge dehydration is 10% of the sludge mass, and other conditions are the same as those in Application Example 1.

[0118] Comparative Application Example 9

[0119] The dosage of the conditioner for deep sludge dehydration is 15% of the sludge mass, and other conditions are the same as those in Application Example 1.

[0120] Comparative Application Example 10

[0121] The dosage of the conditioner for deep dewatering of sludge is 0.5% of the sludge mass, and other conditions are the same as those in Application Example 1.

[0122] The moisture content of the sludge after deep dewatering treatment for Application Examples 12 - 15 and Comparative Application Examples 8 - 10 is shown in Table 6 as follows:

[0123] Table 6 Moisture Content of Sludge Obtained from Application Examples 12 - 15 and Comparative Application Examples 8 - 10

[0124] Example Moisture content of sludge after deep dehydration / % Application Example 1 56.6 Application Example 12 73.4 Application Example 13 64.7 Application Example 14 52.9 Application Example 15 48.6 Comparative Application Example 8 47.8 Comparative Application Example 9 47.1 Comparative Application Example 10 75.4

[0125] It can be seen from Table 6 that as the dosage of the conditioner for deep dewatering of sludge gradually increases, the moisture content of the sludge after deep dewatering gradually decreases. When the dosage of the conditioner for deep dewatering of sludge exceeds 8% of the sludge mass, the decrease rate of the sludge moisture content significantly slows down, but the usage cost of the conditioner for deep dewatering of sludge continuously increases. Therefore, the dosage of the conditioner for deep dewatering of sludge is controlled to be 1 - 8% of the sludge mass as the optimal dosage of the conditioner for deep dewatering of sludge.

[0126] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A conditioner for deep dewatering of sludge, by mass fraction, comprises the following components: 5-10 parts of persulfate, 23-35 parts of composite flocculant, 3-12 parts of activated carbon, 7-16 parts of polydimethyldiallylammonium chloride, 4-11 parts of bentonite, 12-23 parts of zeolite and 5-8 parts of fiber; The composite flocculant comprises polyaluminum chloride and polyferric chloride.

2. The conditioner for deep dewatering of sludge according to claim 1, wherein The persulfate is ammonium persulfate, sodium persulfate or potassium persulfate.

3. The conditioning agent for deep dewatering of sludge according to claim 1, wherein The mass ratio of the polyaluminum chloride to the polyferric chloride is 1:(1-5).

4. The conditioning agent for deep dewatering of sludge according to claim 1, wherein The particle size of the activated carbon is 20-40 mesh.

5. The conditioning agent for deep dewatering of sludge according to claim 1, characterized in that, The molecular weight of the polydimethyldiallylammonium chloride is 4×10 4 ~3×10 6 .

6. The conditioner for deep dewatering of sludge according to claim 1, wherein The particle diameter of the zeolite is 4-8 mm.

7. The conditioner for deep dewatering of sludge according to claim 1, wherein The fiber comprises coconut fiber or cotton fiber; the size of the fiber is 6-25 mm.

8. The preparation method of the conditioner for deep dewatering of sludge according to any one of claims 1 to 7, comprising: Mix the persulfate, composite flocculant, activated carbon, bentonite, zeolite and fiber, and then add polydimethyldiallylammonium chloride and mix to obtain a conditioner for deep dewatering of sludge.

9. Application of the conditioner for deep dewatering of sludge according to any one of claims 1-7 or the conditioner for deep dewatering of sludge prepared by the preparation method according to claim 8 in conditioning deep dewatering of sludge.

10. The application according to claim 9, wherein, The dosage of the conditioner for deep dewatering of sludge is 1-8% of the mass of the sludge.