CN110526550B - Deep dehydration medicament for solid-phase sludge - Google Patents
Deep dehydration medicament for solid-phase sludge Download PDFInfo
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- CN110526550B CN110526550B CN201910773624.XA CN201910773624A CN110526550B CN 110526550 B CN110526550 B CN 110526550B CN 201910773624 A CN201910773624 A CN 201910773624A CN 110526550 B CN110526550 B CN 110526550B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
Abstract
The invention discloses a deep dehydration medicament for solid-phase sludge, which consists of the following substances in percentage by mass: 5 to 20 percent of inorganic flocculant, 0.1 to 1 percent of seepage drag reducer, 79 to 94 percent of curing proppant and 0.1 to 3 percent of wall breaking agent, wherein the inorganic flocculant is polyaluminium chloride, polyferric sulfate, ferric trichloride, aluminum sulfate, polyaluminium ferric silicate, the seepage drag reducer is polyethylene oxide, polydiallyldimethylammonium chloride, acrylamide/sodium acrylate/diallyl dimethylammonium chloride copolymer, humic acid and the like, the curing proppant is fly ash, diatomite, perlite and the like, and the wall breaking agent is potassium permanganate, potassium dichromate, calcium perchlorate, sodium percarbonate and the like. The dehydration medicament is suitable for secondary squeezing dehydration of solid-phase sludge with the water content of about 80 percent to below 60 percent by directly using a squeezing dehydration device such as a high-pressure belt machine, avoids the process problems of secondary dilution and the like of the solid-phase sludge, and does not contain components such as lime and the like which corrode high-temperature equipment and pollute the environment.
Description
Technical Field
The invention belongs to the technical field of sludge dewatering agents, and particularly relates to a composite agent suitable for direct deep dewatering of solid-phase sludge in the process of dewatering the solid-phase sludge by using a high-pressure belt type sludge deep dewatering machine and other devices.
Background
Sludge is a solid, semi-solid and liquid waste produced in the sewage treatment process. With the acceleration of the industrial and urbanization process and the development of the sewage treatment industry, the sewage treatment capacity and the sewage treatment degree are continuously improved, and the yield of the produced sludge is increased day by day. According to the estimation, the sludge yield generated by the municipal, industrial and landscape sewage treatment in China is over 1 hundred million tons/year at present, and the sludge treatment is the implementation guarantee for the final realization of the sewage treatment and is an important link in the field of national water treatment.
The sludge serving as a final product of water treatment has the characteristics of complex components, high water content, high organic matter content, strong hydrophilicity, high dehydration difficulty, high possibility of smelling, serious pollution and the like. The water content of the sludge is generally between 90 and 99 percent, the amount of the sludge is huge, the sludge must be dehydrated before the treatment in order to realize the final effective treatment of the sludge, and the dehydration reduction is an important link for reducing the subsequent treatment cost of the sludge and improving the treatment efficiency of the sludge. Before 2018, the common sludge dewatering standard in the water treatment industry is below 80%, the used dewatering equipment mainly comprises a belt filter press, a screw stacking machine and a centrifugal machine, the 80% sludge subsequent treatment method mainly comprises burying, and secondary pollution and resource waste are serious. With the tightening of the national environmental protection policy, the state at the end of 2018 promotes the standard upgrading of the sludge dewatering reduction, the dewatering rate index is promoted to be below 60 percent, the final treatment modes such as resource utilization, burying, burning and the like are adopted, and the used dewatering equipment is mainly a plate-and-frame filter press.
Aiming at the new sludge dewatering standard with water content of below 60% in 2018, the treatment standard of 80% dewatering equipment established before 2018 is urgent to be upgraded and upgraded, so that the market occupation ratio is high, and the market demand and the technical demand are very urgent. At present, for the technology of upgrading and upgrading the standard of 80% dehydration, the method mainly adopted is to dilute the solid-phase sludge with the water content of 80% to the water content of more than 97% by using water to form slurry, then add a sludge conditioner to carry out conditioning pretreatment, and then use a plate-and-frame filter press to carry out squeezing secondary dehydration to the water content of less than 60%. The process has the problems of complex and repeated processes of secondary dilution, dissolution and dosing and secondary squeezing of solid-phase sludge with water content of 80 percent, repeated dehydration equipment and process, low utilization efficiency, large secondary investment of plate frames and the like.
At present, some devices capable of directly performing solid-phase sludge squeezing and dewatering exist in the market, the purpose of upgrading the 80% water-containing sludge dewatering process can be realized, and after a pretreatment agent is added to the solid-phase sludge, the purpose of directly performing secondary squeezing and dewatering on the solid-phase sludge to achieve the water content of the sludge is achieved. Such as a high-pressure belt filter press dehydrator, the equipment and the technology have excellent market prospect and space. However, because no matched, special and efficient secondary dehydration matched reagent for directly pretreating solid-phase sludge exists at present, the technical requirement that the water content of the solid-phase sludge is below 60 percent can not be met by using common lime and common iron-aluminum salt reagents in a matched manner with equipment. Therefore, the application and popularization of the solid-phase sludge secondary dewatering equipment and technology in the market are greatly limited, and the technical advantages of the process design are not fully exerted. The common agents such as lime and the like can not meet the aim of directly conditioning and dehydrating solid-phase sludge to reach the standard, and simultaneously have secondary pollution, and the components of the agents such as lime and the like which have corrosion influence on high-temperature equipment and pollute the environment are not contained in the components.
Disclosure of Invention
The invention aims to solve the problems that solid-phase sludge subjected to dehydration treatment by sludge dehydration equipment such as a belt filter press, a screw stacking machine and a centrifugal machine can only reach about 80% of water content and cannot meet the technical requirements of new sludge dehydration upgrading and transformation with water content of less than 60% in 2018, and provides a deep dehydration medicament which is not required to dilute the solid-phase sludge by adding water, is directly added into the solid-phase sludge with the water content of about 80%, and is directly subjected to secondary squeezing dehydration reduction to the water content of less than 60% by using the dehydration equipment such as the belt filter press, the screw stacking machine and the centrifugal machine.
Aiming at the purposes, the deep dehydration medicament for solid-phase sludge adopted by the invention consists of the following substances in percentage by mass:
5 to 20 percent of inorganic flocculant, 0.1 to 1 percent of seepage drag reducer, 79 to 94 percent of curing proppant and 0.1 to 3 percent of wall breaking agent.
The deep dehydration medicament for the solid-phase sludge preferably comprises the following substances in percentage by mass:
8 to 15 percent of inorganic flocculant, 0.3 to 0.8 percent of seepage drag reducer, 83 to 90 percent of curing proppant and 1 to 2 percent of wall-breaking oxidant.
The inorganic flocculant is one or more of polyaluminium chloride, polyferric sulfate, ferric trichloride, aluminum sulfate and polyaluminum ferric silicate, and preferably polyaluminium chloride.
The seepage drag reducer is one or more of polyethylene oxide, polydiallyl dimethyl ammonium chloride, acrylamide/sodium acrylate/diallyl dimethyl ammonium chloride copolymer and humic acid, and preferably polydiallyl dimethyl ammonium chloride.
The solidified propping agent is one or more of fly ash, diatomite and perlite, and the perlite is preferred.
The wall breaking agent is one or more of potassium permanganate, potassium dichromate, calcium perchlorate and sodium percarbonate, preferably potassium permanganate.
The solid-phase sludge is solid-phase sludge with the water content of 80-85%, the adding amount of the dehydration medicament is 3-10% of the mass of the solid-phase sludge, the inorganic flocculant is dissolved into a solution with the mass concentration of 30-35% by water and then is mixed and added, and the wall breaking agent is dissolved into a solution with the mass concentration of 8-12% by water and then is mixed and added.
The dehydration medicament is a special solid-phase sludge dehydration medicament which is suitable for solid-phase sludge with the water content of about 80 percent after dehydration treatment of equipment such as a belt filter press, a screw stacking machine, a centrifugal machine and the like, directly carries out secondary press dehydration and upgrading to the water content of below 60 percent by adopting the original equipment, and is a special composite sludge conditioner based on the seepage drag reduction, the sludge seepage framework theory, the sludge press dehydration performance improvement theory and the like. The inorganic flocculant in the components releases gap/bound water in the sludge by utilizing the flocculation dehydration function of the inorganic flocculant; seepage flow channels among sludge micelles/groups are established by the seepage flow drag reducer and the solidified propping agent, so that the seepage flow resistance of sludge dewatering is reduced, and the dewatering efficiency is improved; the wall-breaking agent improves the surface/interface activity of the sludge micelle on the basis of oxidizing and decomposing low-molecular organic matters on the outer layer of the sludge micelle, and releases intracellular water and capillary water in the micelle after the decomposition and wall breaking.
The invention has the following beneficial effects:
1. the dehydration medicament is a novel medicament used for direct secondary dehydration of solid-phase sludge, is suitable for solid-phase sludge with the water content of 80 percent after dehydration by sludge dehydration equipment such as a belt filter press, a screw stacking machine, a centrifugal machine and the like, and is upgraded to the solid-phase sludge secondary squeezing dehydration medicament with the water content of below 60 percent by direct secondary dehydration decrement upgrading by the sludge dehydration equipment. The treatment mode belongs to an innovative treatment mode for secondary dehydration of solid-phase sludge.
2. The dehydration medicament avoids the complex and repeated processes of secondary dilution, dissolution and addition and squeezing of solid-phase sludge with water content of 80%, realizes dehydration after direct addition of chemicals to the solid-phase sludge with water content of 80%, improves the dehydration index to be below 60%, realizes upgrading transformation from direct dehydration with water content of about 80% to water content of below 60% through solid-phase sludge squeezing equipment, can fully develop and meet the market requirements on the secondary dehydration medicament and technology for the solid-phase sludge, and solves the technical problem of realizing direct squeezing equipment dehydration of the solid-phase sludge.
3. The dehydration medicament is suitable for being matched with sludge dehydration equipment such as a high-pressure belt machine and the like capable of continuously dehydrating sludge, realizes continuity and secondary direct dehydration reduction of solid-phase sludge, greatly improves the sludge treatment capacity of batches such as plate frames and the like, reduces the occupied land and realizes movable sludge emergency dehydration engineering.
4. The dehydration medicament does not contain medicament components such as lime, chlorine root substances and the like which pollute high-temperature equipment and the environment, has no negative influence on subsequent sludge resource treatment and utilization, has good environmental adaptability and simple and convenient adding operation, and can realize the direct adding of the medicament into solid sludge to realize dehydration.
Detailed Description
The present invention will be described in further detail with reference to examples, but the scope of the present invention is not limited to these examples.
Example 1
The dehydrating agent of this example consists of:
inorganic flocculant: 5g of polyaluminum chloride;
seepage drag reducer: 0.1g of polyethylene oxide;
curing the propping agent: 94.8g of fly ash;
wall breaking agent: 0.1g of potassium permanganate.
Example 2
The dehydrating agent of this example consists of:
inorganic flocculant: 20g of polyaluminum chloride;
seepage drag reducer: 1.0g of polyethylene oxide;
curing the propping agent: 76.0g fly ash;
wall breaking agent: 3.0g of potassium permanganate.
Example 3
The dehydrating agent of this example consists of:
inorganic flocculant: 10g of polyaluminum chloride;
seepage drag reducer: 0.5g of polyethylene oxide;
curing the propping agent: 89.0g of fly ash;
wall breaking agent: 0.5g of potassium permanganate.
Example 4
The dehydrating agent of this example consists of:
inorganic flocculant: 10g of polymeric ferric sulfate;
seepage drag reducer: 0.5g of polydiallyldimethylammonium chloride;
curing the propping agent: 89.0g of diatomaceous earth;
wall breaking agent: 0.5g of potassium dichromate.
Example 5
The dehydrating agent of this example consists of:
inorganic flocculant: 10g of ferric chloride;
seepage drag reducer: 0.5g acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer;
curing the propping agent: 89.0g of perlite;
wall breaking agent: 0.5g of calcium perchlorate.
Example 6
The dehydrating agent of this example consists of:
inorganic flocculant: 10g of aluminum sulfate, the mass percentage content is 10%;
seepage drag reducer: 0.5g acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer;
curing the propping agent: 89.0g of perlite;
wall breaking agent: 0.5g of sodium percarbonate.
Example 7
The dehydrating agent of this example consists of:
inorganic flocculant: 15g of aluminium sulphate;
seepage drag reducer: 0.5g acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer;
curing the propping agent: 84.0g of perlite;
wall breaking agent: 0.5g of sodium percarbonate.
Example 8
The dehydrating agent of this example consists of:
inorganic flocculant: 5g of polyaluminum ferric silicate;
seepage drag reducer: 0.5g of humic acid;
curing the propping agent: 94.0g of perlite;
wall breaking agent: 0.5g of sodium percarbonate.
Example 9
The dehydrating agent of this example consists of:
inorganic flocculant: 5g of polyaluminum chloride;
seepage drag reducer: 0.5g of humic acid;
curing the propping agent: 89.0g of perlite;
wall breaking agent: 0.5g of potassium permanganate.
In order to prove the beneficial effects of the invention, the inventor adopts the dehydration medicament of the embodiment 1-9 to carry out secondary dehydration on the solid-phase sludge with the water content of about 80 percent, and the specific method is as follows:
preparing an inorganic flocculant into an aqueous solution with the mass concentration of 33% and preparing a wall breaking agent into an aqueous solution with the mass concentration of 10%, then adding all components into the solid-phase sludge, and mechanically stirring for pretreatment for 3 min; then the pretreated solid-phase sludge enters a high-pressure belt type filter-pressing dehydrator for pressing dehydration; the pressure of the high-pressure belt type filter-press dehydrator is more than 0.2MPa, and the press dehydration time is more than 1.5 min. The test equipment yields the mud water content, and the results are shown in table 1.
TABLE 1 results of testing the dewatering performance of solid-phase sludge with different dewatering agents
As can be seen from Table 1, the dehydration medicament provided by the invention can meet the index requirement of below 60% after national standard extraction after being used for direct secondary squeezing dehydration of solid-phase sludge with the water content of 80-85%.
Claims (6)
1. A dehydration medicament for solid-phase sludge is characterized by comprising the following substances in percentage by mass:
5 to 20 percent of inorganic flocculant, 0.1 to 1 percent of seepage drag reducer, 79 to 94 percent of curing proppant and 0.1 to 3 percent of wall breaking agent;
the inorganic flocculant is one or more of polyaluminium chloride, polyferric sulfate, ferric trichloride, aluminum sulfate and polyaluminium ferric silicate;
the seepage drag reducer is one or more of polyethylene oxide, polydiallyl dimethyl ammonium chloride, acrylamide/sodium acrylate/diallyl dimethyl ammonium chloride copolymer and humic acid;
the solidified propping agent is one or more of fly ash, diatomite and perlite;
the wall breaking agent is one or more of potassium permanganate, potassium dichromate, calcium perchlorate and sodium percarbonate,
the solid-phase sludge is solid-phase sludge with the water content of 80-85 percent,
the adding amount of the dehydration medicament is 3-10% of the mass of the solid-phase sludge, wherein the inorganic flocculant is mixed and added after being dissolved into a solution with the mass concentration of 30-35% by water, the wall-breaking agent is mixed and added after being dissolved into a solution with the mass concentration of 8-12% by water,
the solid-phase sludge treated by the dehydrating agent is directly subjected to secondary squeezing dehydration by a belt filter press, a screw stacking machine or a centrifugal machine to reduce the water content to below 60 percent.
2. The dewatering agent for solid-phase sludge according to claim 1, characterized in that the dewatering agent consists of the following substances in percentage by mass:
8 to 15 percent of inorganic flocculant, 0.3 to 0.8 percent of seepage drag reducer, 83 to 90 percent of curing proppant and 1 to 2 percent of wall-breaking oxidant.
3. The dewatering agent for solid-phase sludge according to claim 2, characterized in that: the inorganic flocculant is polyaluminium chloride.
4. The dewatering agent for solid-phase sludge according to claim 2, characterized in that: the seepage drag reducer is poly diallyl dimethyl ammonium chloride.
5. The dewatering agent for solid-phase sludge according to claim 2, characterized in that: the solidified propping agent is perlite.
6. The dewatering agent for solid-phase sludge according to claim 2, characterized in that: the wall breaking agent is potassium permanganate.
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| CN111204824A (en) * | 2020-01-17 | 2020-05-29 | 广东东日环保股份有限公司 | River surge sewage treatment agent and preparation method thereof |
| CN111056729B (en) * | 2020-02-18 | 2022-06-28 | 广州绿邦环境技术有限公司 | Medicament for sludge filter pressing and production process |
| CN111718104A (en) * | 2020-06-19 | 2020-09-29 | 中碳(上海)科技有限公司 | Polysilicate iron chemical conditioner and preparation method thereof |
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