CN105330123A - Formula for deep dehydration of sludge and operation method of formula - Google Patents
Formula for deep dehydration of sludge and operation method of formula Download PDFInfo
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- CN105330123A CN105330123A CN201510793533.4A CN201510793533A CN105330123A CN 105330123 A CN105330123 A CN 105330123A CN 201510793533 A CN201510793533 A CN 201510793533A CN 105330123 A CN105330123 A CN 105330123A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
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Abstract
The invention relates to deep dehydration of sludge, in particular to a formula for deep degradation of sludge and an operation method of the formula. The formula comprises steps as follows: preparation of auxiliary materials, primary treatment of the sludge, thermal refining of the sewage, mechanical filter pressing and backflow of filtrate. According to the formula for deep dehydration of the sludge and the operation method of the formula, continuous treatment can be performed, the treatment efficiency is improved, energy is saved, consumption is reduced, the controllability is high, and recycling is realized.
Description
Technical field
The present invention relates to mud height dehydration, particularly a kind of formula for mud height dehydration and working method thereof.
Background technology
So-called mud generally refers to the terminal waste of sewage disposal, and these mud contain a large amount of microorganisms, pathogenic agent, distribute stench, what have also contains heavy metal, and water ratio is up to more than 95%, after sewage work's simple process, water ratio is still up to about 85%.For these mud, most domestic all adopted the processing mode of landfill in the past, but along with time trickling, this processing mode exposes that floor space is wide, the series of problems such as cause secondary pollution, process not thorough gradually, do not meet the general policy of China to specific resistance to filtration " decrement, safety, resource utilization ", along with domestic to the attention of environment guarantor and the raising of environmental requirement, the direct landfill disposal mode of mud is abandoned gradually, and the modes such as more employing burnings, burning electricity generation, brickmaking, manufacture haydite.Mud after sewage work's belt filter press process, general water ratio is still more than 80%, and such mud has high viscosity, in indefinite form shape, have certain mobility, moisture is wrapped in inside, not easily separated and evaporation, give transport and subsequent disposal bring very large problem.And want reasonable lignin-sludge problem, matter of utmost importance is exactly the moisture in mud will be lowered.If sludge water content is down to 50% from 85%, its volume can reduce to original 30%, for further sludge disposal brings great convenience.For the mud by burning disposal, because every premium on currency enters gasification burning in incinerator, approximately need the heat of in-fighting 900 ~ 1200 kilocalorie, if enter the mud before incinerator to reduce moisture as far as possible, just can greatly reduce combustion-supporting hear rate, reduce cost of disposal, accomplish the requirement of saving energy and reduce the cost.And mud is applied to brickmaking, potting grain as building materials, first its moisture to be down to 40% ~ 50%, just can implement later process.In a word, for the Sludge Disposal Techniques of a new generation, the dehydration of mud, drying technique are keys.For the moisture how reduced in mud, this is current problem always puzzled in the industry.In the current industry of China, conventional sludge dewatering roughly has following several types:
1, heating power mummification: such as turn round sleeve mummification, garden dish desiccation machine, low temperature fluidized bed, blade drier, fume afterheat mummification etc.These are all remove moisture with energy heats, and do not destroy mud Central Plains tax calorific value, and being therefore with energy replacement, is " with hot heat exchange ", and is " little to put greatly ", but this is unallowed in technical concept.Result in real world applications is that efficiency is low, investment is large, and running cost is high.
2, mechanical dehydration: in city, common mechanical dehydration has filter press, centrifuge dehydration, belt type filter-pressing dehydration plant, screw press etc. at present.Mud final moisture after the dehydration of these technology, generally about 75%-87%, subtracts appearance thorough, and moisture declines remarkable, and terminal resourceization utilization is still difficult.Same disadvantage is that investment is large, and running cost is high, and effect is undesirable, may to the non-tool of the recycling in rear road.
3, thermal machine stack combinations takes off: as mechanical balling-up, heating power mummification, market also can be seen.But this method is only improve a point efficiency in a certain link of original base, does not solve the problem of essence.Although having surplus heat under given conditions of having is available, this dependence limitation to heat is very large, because all trades and professions are all in energy-saving and emission-reduction at present, dependable waste heat is fewer and feweri.On the other hand, as household heat source, invest more surprising.
In recent years, domestic Sludge Disposal Techniques was rapidly developed, and particularly sheet frame barrier film high pressure pressure filtering technique is fully applied, and moisture percentage in sewage sludge is controlled in less than 60% substantially, for the follow-up disposal of mud creates good condition.But, the domestic unit utilizing the mud of this class methods process, a lot of terminal process not relating to mud, during lignin-sludge, due to the restriction of technology and academic expertise aspect, generally all only consider the reduction of sludge water content, to the medicament added in sludge disposal process remaining in mud cake, thus bring the impact consideration of the follow-up disposal of mud inadequate thus.Mud cake after such as general disposal methods, water ratio can control about 55%, but mud cake includes a large amount of residual sulphuric anhydride, iron ion, calcium ion and lime mud, and pH value, 9-10, even reaches 12.These are when sludge incineration, burning electricity generation, dispose and atmospheric environment protection brings and has a strong impact on to the safety of burning facility, flue gas.Be applied to the building material industries such as brickmaking at mud, then can have a strong impact on fragment of brick shaping, fire and last fragment of brick quality.
Summary of the invention
The technical problem that the present invention mainly solves is, a kind of formula for mud height dehydration solving a kind of less energy-consumption, can effectively reduce sludge water content and be particularly suitable for making brick from sludge and working method thereof.
To achieve these goals, the present invention is by the following technical solutions:
1, for formula and the working method thereof of mud height dehydration, it is characterized in that carrying out according to the following steps:
(1), auxiliary material prepares:
Coagulant precipitation agent, bactericidal deodorant, modified skeletal agent;
Described coagulant precipitation agent is polymerize aluminum chloride; Described bactericidal deodorant is clorox; Described modified skeletal agent is diatomite breeze;
(2), mud tentatively configures:
Will after sewage work's pressure filter process, forming water ratio is the mud of 80% ~ 87%, join mud reception tank, thin up, forming water ratio is the sludge slurry of 90% ~ 94%, makes it the requirement meeting mechanical transport and stirring, and at utmost can be applicable to subsequent technique, then rise in modified pond through transport pipe under the effect of slush pump, carry out subsequent operations;
(3), mud modifier treatment:
1., after step (2), start the stirring in the modified pond of mud, while sludge slurry is squeezed on limit, quantitative polymerize aluminum chloride is added in the modified pond of mud, polymerize aluminum chloride is added in the modified pond of mud by dosing pump, adding of polymerize aluminum chloride is measured by magnetic flow meter, and the add-on of polymerize aluminum chloride is 0.5% ~ 1.5% of sludge quantity;
Al in polymerize aluminum chloride
3+after hydrolysis, can destroy the charge balance in mud micelle, its hydrolysate can be polymerized with organism in mud and heavy metal ion and generate colloid hydroxy polymer or precipitation of hydroxide.
2., through step 1. after in the modified pond of mud, add clorox, adding of clorox is measured by magnetic flow meter, and the add-on of clorox is 0.01% ~ 0.02% of sludge quantity;
3., through step 2. after in the modified pond of mud adds diatomite in powder, automatic feeding after diatomite in powder is measured by the electronic scale be furnished with in storage tank, calculate by mass percentage, the add-on of diatomite breeze is 0.2% ~ 0.4% of sludge quantity;
First polyaddition aluminum chloride can destroy the charge balance of mud, adding then with clorox, due to the strong oxidation of clorox, and the Al in polymerize aluminum chloride
3+after further hydrolysis, can destroy the charge balance in mud micelle, its hydrolysate can be polymerized with organism in mud and heavy metal ion and generate colloid hydroxy polymer or precipitation of hydroxide.Clorox is deodorization and sterilization and strong oxidation mainly, finally adds diatomite in powder and plays decolouring, absorption and coagulation, and provide skeleton function, make the agglomerating cohesion of mud.
4., through step 3. after mud fully stir, mud is fully mixed with coagulant precipitation agent, bactericidal deodorant, modified skeletal agent, and under the effect of shearing force, various groups after mud granule and the medicament added are hydrolyzed constantly collide, form suitable coagulated particles, greatly improve the dewatering of mud;
This mud, by to the very difficult mud that dewaters under normal circumstances, carry out special effect processing, change mud morphology of particles and performance, reduce the bonding force between sludge water and sewage sludge solid particle, discharge water in the interparticle Bound moisture of mud, planar water and microorganism cells, greatly improve the dewatering of mud, and accelerate sludge dehydration process.While reaching mud high-efficiency dehydration, take into account follow-up brickmaking technology requirement, the medicament of interpolation can not have an impact to shaping, the roasting of brickmaking and final product quality not to the utmost, and the aluminium agent added, diatomite are conducive to brickmaking production technique.
Water in mud, be not moisture in general sense, but adsorbed or be wrapped in the irreducible water of cell interior by solid particulate, its periphery of the water molecules be " entrapped " is fastening by very powerful negative charge, positive charge in it and water core averages out, and makes normal dehydration very difficulty.And multiple high-order and multinuclear complexing ion can be produced after polymerize aluminum chloride hydrolysis, much larger with specific surface, have enough positively charged ions can with its displacement, electrical counteract is carried out to mud colloidal solid, reduce Zata current potential, destroy the positive negative balance of former water core and cause medium to depart from constraint formation " freedom ", under effect caught by electrostatic double layer compressive action, absorption charge neutrality effect, adsorption bridging and throw out net, make the potent dehydration of mud energy.And the hydration complexing ion [Al (H in polymerize aluminum chloride
2o)
6]
3+hydrolysis ability is strong, can be hydrolyzed and produce multiple polymerization plasma, as Al
3+, Al (OH)
2+, Al (OH)
3, Al (OH)
4 -, [Al
6(H
2o)
14]
4+, [Al
7(H
2o)
17]
4+, [Al
8(H
2o)
20]
4+, [Al
13(H
2o)
34]
5+deng composition.In the polymerization positive ion energy of wherein high price and the negative charge of mud micelle, and greatly reduce its electrostatic double layer, promote coagulation.And be hydrolyzed the colloid hydroxy polymer or precipitation of hydroxide that produce, can the solid matter of fine dispersion and colloidalmaterial in planar water, as clay and humic acid etc., it can work with the contained heavy metal such as iron, manganese, chromium, lead in sludge slurry, can be heavy metal-passivated, play the effect removing heavy metal, it can also remove fluorochemical and oily substance.Reducing gas Oxidation of Hydrogen Sulfide, effectively control foul smell, therefore there is decolouring, degerming except the function such as radioactivity, deodorizing.With CaO conbined usage below.
Clorox is a kind of strong oxidizer, cell walls based on protein and enzyme, acid RNA, the cell tissue of carbohydrate and grease can be destroyed, thus reach the effect of sterilization, kill microorganisms a large amount of in mud and the bacterium such as intestinal bacteria, Salmonellas, mud deep layer " irreducible water " is released, promote sludge dewatering effect, also have the effect of sterilization, sterilization, deodorizing simultaneously, effectively improve Working environment.
Diatomite is a kind of natural mineral, and its main component is SiO
2(accounting for 65%-90%), Al
2o
3(accounting for 15%-20%), all the other are Fe
2o
3, CaO, MgO and some organism, there is good decolouring, adsorb and help coagulation.Containing a large amount of organic microbial in mud, by chemical agent conditioning above, change sludge characteristics, make mud high-efficiency dehydration become possibility, but moisture in mud can not natural separation, must carry out press filtration by machinery, utilization increases pressure to sludge pressing, further destruction sludge structure, makes the potent dehydration of mud become a reality, reaches the object of reducing sludge volume, mummification.And the physical propertys such as the intrinsic thickness of mud, snappiness, be unfavorable for machinery directly press filtration, must consider the requirement of sludge press filtration bearing capacity, external facts have proved, in mud, only forms skeleton mechanism filter-pressing just can be made to carry out smoothly.Add Diatomite mineral powder, not only can play decolouring, adsorb, help the effects such as solidifying, deodorizing, nucleation can also play skeleton function, contribute to improving efficiency of press filtering, moisture in further reduction sludge dewatering mud cake, improves dehydrated sludge cake performance, for the brickmaking process of rear road or recycling create conditions.
Fully stir in modified pond, mud is mixed with polymerize aluminum chloride, clorox, Diatomite mineral powder, plays the effect of each composition, improve dewatering efficiency.
(4), mechanism filter-pressing:
1., after step (3), with spiral pump, the mud that modifier treatment is good is conveyed in autoclave diaphragm pressure filter, entering mud pressure is 0.50 ~ 0.80Mpa, utilize screen plate in autoclave diaphragm pressure filter, the filtering unit of diaphragm plate and filter cloth composition, compress the condition of filter plate at high-voltage oil cylinder under, with fresh feed pump pressure, preliminary solid-liquid separation is carried out to material, most interstitial water in separated sludge particle, continue into mud 50.0 ~ 60.0min, enter mud pressure to raise gradually, when entering mud pressure and being 1.5Mpa, stop into mud, now in mud, most of segregative interstitial water is removed, mud begins to take shape sludge filter cake,
2., through step 1. after, pressurized air is passed in the diaphragm cavity of autoclave diaphragm pressure filter, mud in filter chamber is fully squeezed, utilize diaphragm pressing technology to carry out high-pressure compressing to sludge filter cake, under High Pressure, the irreducible water of the mud after modifier treatment is separated, the further dehydration and drying of filter cake, time of filter pressing is 50.0 ~ 60.0min, and pressure remains on 5.0 ~ 6.0Mpa, and now sludge filter cake water ratio is 45% ~ 50%;
3., through step 2. after, removal pressure, open autoclave diaphragm pressure filter, by the blow-removing system in autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by dump system, carry out further air-dry or oven dry, make moisture content of the cake be down to less than 40%, then pulverize, and join by a certain percentage in brick-making raw material;
(5), filtrate backflow:
Filtrate in press filtration is all back in step (2).
Basic technique principle foundation of the present invention:
Particle in mud is that zoogloea and suspended solids form colloidal structure, and wherein contained moisture can be divided into fissure water, capillary water, surface adsorption water and internal water.Because the structure of mud granule surface property and mud group determined, mud granule surface adsorption forms by various negatively charged ions and by microorganism extracellular polymeric etc. secreted in cells in vitro in its metabolic process.These negatively charged ions and extracellular polymeric have very strong retentiveness.These mud granules constitute mud group, form various capillary channels, therefore, mud is except fissure water, water in the water separately all held by mud granule surface by quite a few moisture and capillary channel forms, these are all Bound moisture, general mud fissure water accounts for about 70%, all the other are about 30%, because mud has high-hydrophilic, not only the Bound moisture of this constraint can not remove by simple mechanical process, is exactly that most fissure water can not can dewater with mechanical expression simply.Therefore, make mud high-efficiency dehydration, one is the water rate that will improve fissure water, and two is will liberate " irreducible water ".Follow this guiding theory, the present invention utilizes the technological line of " chemical modification+high pressure press filtration ", take the integrated conduct method of chemistry+physics, by the sludge dewatering treatment of moisture 80% ~ 87%, obtain the semi-dry sludge of moisture about 50%, for the thorough disposal of rear road order or recycling create conditions.
By mechanical supercharging, high-pressure compressing is carried out to the mud through chemical conditioning, under High Pressure, destroy microorganism cells in mud further, the moisture in mud is deviate from, realizes solid-liquid separation, reach mud height dehydration, mummification object.
Adopt diaphragm pressing technology to carry out high-pressure compressing to sludge filter cake, under High Pressure, destroy microorganism cells in mud further, change sludge structure, the moisture height in mud is removed, realizes solid-liquid separation, reach sludge drying object.
Dehydrated sludge filter cake is comparatively hard, in block, through simply air-dry, drying and processing, just can directly utilize, for the ultimate sludge disposal such as brickmaking, burning technique.
Filter cake is met water and is not restored, there is hydrophobicity, and moisture continues evaporation in its natural state, mud cake is fragmented into particulate state naturally, while realization " minimizing ", the objectionable impurities in mud is also able to " stabilization ", even if do not carry out other drying and other treatment, also be applicable to transport transfer, and significantly can reduce mud stacking place.
Filtrate filtrate in press filtration contains residual Al
3+, [Al
13(H
2o)
34]
5+deng complexing ion, filtrate is back to the modified effect that mud reception tank can significantly improve mud.
Receive the mud after mechanical dehydration, due to moisture about 87%-80%, do not need to carry out concentration, directly carry out sludge conditioning and high pressure press filtration operation.In order to improve the transportation performance of mud, part water should be added when modifier treatment, after production line comes into operation, the portion filtrate after press filtration can be introduced, temporarily improving moisture percentage in sewage sludge to 90% ~ 94%.
Effect of the present invention and advantage: 1., the present invention utilizes " chemical modification+high pressure press filtration ", take the integrated conduct method of chemistry+physics, with chemical agent and natural mineral, modification is carried out to mud, to make in mud after belt filter press process, the organic substance decomposings such as residual polymeric flocculant lose effectiveness, and the various bacteria of killing in mud and microorganism, decompose cell walls, liberation " irreducible water ", moisture is removed smoothly under High Pressure, the mud height of moisture 87% ~ 80% is dewatered, obtain the semi-dry sludge of moisture 47% ~ 52%, really realize the requirement of sludge treatment decrement, mud for later process thoroughly disposes or recycling creates conditions.2., the operation of whole treating processes cold conditions, heating without burning the exhaust emissions that causes, not relying on ambient conditions, not needing thermal source, more not consuming the disposable energy, effectively reduce energy consumption.Only have the process of press filtration water backflow Sewage Plant, working conditions and environment well, meet and meet safety, civilized operational requirement.3., process after sludge cake meet water do not restore, there is hydrophobicity, and in its natural state moisture can continue evaporation, mud cake is fragmented into particulate state naturally, realization " minimizing " while, the objectionable impurities in mud is also able to " stabilization ".4., whole process operating process does not affect the original element formation of mud, do not lose sludge calorific value, do not add materials such as iron, calcium oxide and sulphuric anhydrides that brickmaking has a negative impact, the substance advantageous such as the aluminium added, diatomite, in the production of fragment of brick, really accomplish recycling and the ultimate disposal of mud.
The present invention is a kind of formula for mud height dehydration and working method thereof, can continuous treatment, and improve processing efficiency, energy-saving and cost-reducing, controllability is high, can recycle.
Embodiment
Below in conjunction with embodiment, further illustrate content of the present invention.
Embodiment 1:
(1), auxiliary material prepares:
Pending sludge quantity is 100 tons (about 100 cubes), and moisture percentage in sewage sludge 87%, adds medicament: polymerize aluminum chloride 0.5 ton, clorox 0.01 ton and diatomite breeze 0.2 ton;
(2), mud tentatively configures:
Will after sewage work's pressure filter process, forming water ratio is the mud of 80%, join mud reception tank, thin up, forming water ratio is the sludge slurry of 90%, makes it the requirement meeting mechanical transport and stirring, and at utmost can be applicable to subsequent technique, then rise in modified pond through transport pipe under the effect of slush pump, carry out subsequent operations;
(3), mud modifier treatment:
1., after step (2), start the stirring in the modified pond of mud, while sludge slurry is squeezed on limit, quantitative polymerize aluminum chloride is added in the modified pond of mud, polymerize aluminum chloride is added in the modified pond of mud by dosing pump, adding of polymerize aluminum chloride is measured by magnetic flow meter, and the add-on of polymerize aluminum chloride is 0.5% of sludge quantity;
2., through step 1. after in the modified pond of mud, add clorox, adding of clorox is measured by magnetic flow meter, and the add-on of clorox is 0.01% of sludge quantity;
3., through step 2. after in the modified pond of mud adds diatomite in powder, automatic feeding after diatomite in powder is measured by the electronic scale be furnished with in storage tank, calculate by mass percentage, the add-on of diatomite breeze is 0.2% of sludge quantity;
4., through step 3. after mud fully stir, mud is fully mixed with coagulant precipitation agent, bactericidal deodorant, modified skeletal agent, and under the effect of shearing force, various groups after mud granule and the medicament added are hydrolyzed constantly collide, form suitable coagulated particles, greatly improve the dewatering of mud;
(4), mechanism filter-pressing:
1., after step (3), with spiral pump, the mud that modifier treatment is good is conveyed in autoclave diaphragm pressure filter, entering mud pressure is 0.50Mpa, utilize screen plate in autoclave diaphragm pressure filter, the filtering unit of diaphragm plate and filter cloth composition, compress the condition of filter plate at high-voltage oil cylinder under, with fresh feed pump pressure, preliminary solid-liquid separation is carried out to material, most interstitial water in separated sludge particle, continue into mud 50.0min, enter mud pressure to raise gradually, when entering mud pressure and being 1.5Mpa, stop into mud, now in mud, most of segregative interstitial water is removed, mud begins to take shape sludge filter cake,
2., through step 1. after, pressurized air is passed in the diaphragm cavity of autoclave diaphragm pressure filter, mud in filter chamber is fully squeezed, utilize diaphragm pressing technology to carry out high-pressure compressing to sludge filter cake, under High Pressure, the irreducible water of the mud after modifier treatment is separated, the further dehydration and drying of filter cake, time of filter pressing is 50.0min, and pressure remains on 5.0 ~ 6.0Mpa, and now sludge filter cake water ratio is 45%;
3., through step 2. after, removal pressure, open autoclave diaphragm pressure filter, by the blow-removing system in autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by dump system, carry out further air-dry or oven dry, make moisture content of the cake be down to less than 40%, then pulverize, and join by a certain percentage in brick-making raw material;
(5), filtrate backflow:
Filtrate in press filtration is all back in step (2).
Embodiment 2:
(1), auxiliary material prepares:
Coagulant precipitation agent, bactericidal deodorant, modified skeletal agent;
Described coagulant precipitation agent is polymerize aluminum chloride; Described bactericidal deodorant is clorox; Described modified skeletal agent is diatomite breeze;
(2), mud tentatively configures:
Will after sewage work's pressure filter process, forming water ratio is the mud of 85%, join mud reception tank, thin up, forming water ratio is the sludge slurry of 92%, makes it the requirement meeting mechanical transport and stirring, and at utmost can be applicable to subsequent technique, then rise in modified pond through transport pipe under the effect of slush pump, carry out subsequent operations;
(3), mud modifier treatment:
1., after step (2), start the stirring in the modified pond of mud, while sludge slurry is squeezed on limit, quantitative polymerize aluminum chloride is added in the modified pond of mud, polymerize aluminum chloride is added in the modified pond of mud by dosing pump, adding of polymerize aluminum chloride is measured by magnetic flow meter, and the add-on of polymerize aluminum chloride is 1% of sludge quantity;
2., through step 1. after in the modified pond of mud, add clorox, adding of clorox is measured by magnetic flow meter, and the add-on of clorox is 0.015% of sludge quantity;
3., through step 2. after in the modified pond of mud adds diatomite in powder, automatic feeding after diatomite in powder is measured by the electronic scale be furnished with in storage tank, calculate by mass percentage, the add-on of diatomite breeze is 0.3% of sludge quantity;
4., through step 3. after mud fully stir, mud is fully mixed with coagulant precipitation agent, bactericidal deodorant, modified skeletal agent, and under the effect of shearing force, various groups after mud granule and the medicament added are hydrolyzed constantly collide, form suitable coagulated particles, greatly improve the dewatering of mud;
(4), mechanism filter-pressing:
1., after step (3), with spiral pump, the mud that modifier treatment is good is conveyed in autoclave diaphragm pressure filter, entering mud pressure is 0.6Mpa, utilize screen plate in autoclave diaphragm pressure filter, the filtering unit of diaphragm plate and filter cloth composition, compress the condition of filter plate at high-voltage oil cylinder under, with fresh feed pump pressure, preliminary solid-liquid separation is carried out to material, most interstitial water in separated sludge particle, continue into mud 55min, enter mud pressure to raise gradually, when entering mud pressure and being 1.5Mpa, stop into mud, now in mud, most of segregative interstitial water is removed, mud begins to take shape sludge filter cake,
2., through step 1. after, pressurized air is passed in the diaphragm cavity of autoclave diaphragm pressure filter, mud in filter chamber is fully squeezed, utilize diaphragm pressing technology to carry out high-pressure compressing to sludge filter cake, under High Pressure, the irreducible water of the mud after modifier treatment is separated, the further dehydration and drying of filter cake, time of filter pressing is 55min, and pressure remains on 5.5Mpa, and now sludge filter cake water ratio is 47%;
3., through step 2. after, removal pressure, open autoclave diaphragm pressure filter, by the blow-removing system in autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by dump system, carry out further air-dry or oven dry, make moisture content of the cake be down to less than 40%, then pulverize, and join by a certain percentage in brick-making raw material;
(5), filtrate backflow:
Filtrate in press filtration is all back in step (2).
Embodiment 3:
(1), auxiliary material prepares:
Coagulant precipitation agent, bactericidal deodorant, modified skeletal agent;
Described coagulant precipitation agent is polymerize aluminum chloride; Described bactericidal deodorant is clorox; Described modified skeletal agent is diatomite breeze;
(2), mud tentatively configures:
Will after sewage work's pressure filter process, forming water ratio is the mud of 87%, join mud reception tank, thin up, forming water ratio is the sludge slurry of 94%, makes it the requirement meeting mechanical transport and stirring, and at utmost can be applicable to subsequent technique, then rise in modified pond through transport pipe under the effect of slush pump, carry out subsequent operations;
(3), mud modifier treatment:
1., after step (2), start the stirring in the modified pond of mud, while sludge slurry is squeezed on limit, quantitative polymerize aluminum chloride is added in the modified pond of mud, polymerize aluminum chloride is added in the modified pond of mud by dosing pump, adding of polymerize aluminum chloride is measured by magnetic flow meter, and the add-on of polymerize aluminum chloride is 1.5% of sludge quantity;
2., through step 1. after in the modified pond of mud, add clorox, adding of clorox is measured by magnetic flow meter, and the add-on of clorox is 0.02% of sludge quantity;
3., through step 2. after in the modified pond of mud adds diatomite in powder, automatic feeding after diatomite in powder is measured by the electronic scale be furnished with in storage tank, calculate by mass percentage, the add-on of diatomite breeze is 0.4% of sludge quantity;
4., through step 3. after mud fully stir, mud is fully mixed with coagulant precipitation agent, bactericidal deodorant, modified skeletal agent, and under the effect of shearing force, various groups after mud granule and the medicament added are hydrolyzed constantly collide, form suitable coagulated particles, greatly improve the dewatering of mud;
(4), mechanism filter-pressing:
1., after step (3), with spiral pump, the mud that modifier treatment is good is conveyed in autoclave diaphragm pressure filter, entering mud pressure is 0.80Mpa, utilize screen plate in autoclave diaphragm pressure filter, the filtering unit of diaphragm plate and filter cloth composition, compress the condition of filter plate at high-voltage oil cylinder under, with fresh feed pump pressure, preliminary solid-liquid separation is carried out to material, most interstitial water in separated sludge particle, continue into mud 60.0min, enter mud pressure to raise gradually, when entering mud pressure and being 1.5Mpa, stop into mud, now in mud, most of segregative interstitial water is removed, mud begins to take shape sludge filter cake,
2., through step 1. after, pressurized air is passed in the diaphragm cavity of autoclave diaphragm pressure filter, mud in filter chamber is fully squeezed, utilize diaphragm pressing technology to carry out high-pressure compressing to sludge filter cake, under High Pressure, the irreducible water of the mud after modifier treatment is separated, the further dehydration and drying of filter cake, time of filter pressing is 60.0min, and pressure remains on 6.0Mpa, and now sludge filter cake water ratio is 50%;
3., through step 2. after, removal pressure, open autoclave diaphragm pressure filter, by the blow-removing system in autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by dump system, carry out further air-dry or oven dry, make moisture content of the cake be down to less than 40%, then pulverize, and join by a certain percentage in brick-making raw material;
(5), filtrate backflow:
Filtrate in press filtration is all back in step (2).
Claims (1)
1., for formula and the working method thereof of mud height dehydration, it is characterized in that carrying out according to the following steps:
(1), auxiliary material prepares:
Coagulant precipitation agent, bactericidal deodorant, modified skeletal agent;
Described coagulant precipitation agent is polymerize aluminum chloride; Described bactericidal deodorant is clorox; Described modified skeletal agent is diatomite breeze;
(2), mud tentatively configures:
Will after sewage work's pressure filter process, forming water ratio is the mud of 80% ~ 87%, join mud reception tank, thin up, forming water ratio is the sludge slurry of 90% ~ 94%, makes it the requirement meeting mechanical transport and stirring, and at utmost can be applicable to subsequent technique, then rise in modified pond through transport pipe under the effect of slush pump, carry out subsequent operations;
(3), mud modifier treatment:
1., after step (2), start the stirring in the modified pond of mud, while sludge slurry is squeezed on limit, quantitative polymerize aluminum chloride is added in the modified pond of mud, polymerize aluminum chloride is added in the modified pond of mud by dosing pump, adding of polymerize aluminum chloride is measured by magnetic flow meter, and the add-on of polymerize aluminum chloride is 0.5% ~ 1.5% of sludge quantity;
2., through step 1. after in the modified pond of mud, add clorox, adding of clorox is measured by magnetic flow meter, and the add-on of clorox is 0.01% ~ 0.02% of sludge quantity;
3., through step 2. after in the modified pond of mud adds diatomite in powder, automatic feeding after diatomite in powder is measured by the electronic scale be furnished with in storage tank, calculate by mass percentage, the add-on of diatomite breeze is 0.2% ~ 0.4% of sludge quantity;
4., through step 3. after mud fully stir, mud is fully mixed with coagulant precipitation agent, bactericidal deodorant, modified skeletal agent, and under the effect of shearing force, various groups after mud granule and the medicament added are hydrolyzed constantly collide, form suitable coagulated particles, greatly improve the dewatering of mud;
(4), mechanism filter-pressing:
1., after step (3), with spiral pump, the mud that modifier treatment is good is conveyed in autoclave diaphragm pressure filter, entering mud pressure is 0.50 ~ 0.80Mpa, utilize screen plate in autoclave diaphragm pressure filter, the filtering unit of diaphragm plate and filter cloth composition, compress the condition of filter plate at high-voltage oil cylinder under, with fresh feed pump pressure, preliminary solid-liquid separation is carried out to material, most interstitial water in separated sludge particle, continue into mud 50.0 ~ 60.0min, enter mud pressure to raise gradually, when entering mud pressure and being 1.5Mpa, stop into mud, now in mud, most of segregative interstitial water is removed, mud begins to take shape sludge filter cake,
2., through step 1. after, pressurized air is passed in the diaphragm cavity of autoclave diaphragm pressure filter, mud in filter chamber is fully squeezed, utilize diaphragm pressing technology to carry out high-pressure compressing to sludge filter cake, under High Pressure, the irreducible water of the mud after modifier treatment is separated, the further dehydration and drying of filter cake, time of filter pressing is 50.0 ~ 60.0min, and pressure remains on 5.0 ~ 6.0Mpa, and now sludge filter cake water ratio is 45% ~ 50%;
3., through step 2. after, removal pressure, open autoclave diaphragm pressure filter, by the blow-removing system in autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by dump system, carry out further air-dry or oven dry, make moisture content of the cake be down to less than 40%, then pulverize, and join by a certain percentage in brick-making raw material;
(5), filtrate backflow:
Filtrate in press filtration is all back in step (2).
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