CN102229464A - Preparation and method for drying sludge through deep dehydrating - Google Patents
Preparation and method for drying sludge through deep dehydrating Download PDFInfo
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- CN102229464A CN102229464A CN2011101466240A CN201110146624A CN102229464A CN 102229464 A CN102229464 A CN 102229464A CN 2011101466240 A CN2011101466240 A CN 2011101466240A CN 201110146624 A CN201110146624 A CN 201110146624A CN 102229464 A CN102229464 A CN 102229464A
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Abstract
The invention relates to a preparation and a treatment method, and especially relates to a preparation and a method for drying sludge through deep dehydrating. The preparation comprises: 0.000002 to 0.00001 parts of an organic polymeric flocculants, 0.00025 to 0.0025 parts of a coagulating modifier, 0.0005 to 0.00375 parts of a sterilizing deodorant, and 0.00025 to 0.0025 parts of a nucleating converting agent. The method comprises the following steps: a sludge gravity thickening initial dehydrating step, a sludge regulating step, a mechanical press-filtrating step, and a filtrate refluxing step. With the preparation and the method provided by the present invention, sludge deep dehydrating processes can be carried out in series, processing efficiency can be improved, and energy consumption can be reduced. The controllability of the method is high. With the method, recycling is realized.
Description
Technical field
The present invention is a kind of prescription and treatment process, particularly a kind of prescription that is used for the mud height dehydration and drying and preparation method thereof.
Background technology
So-called mud is meant the terminal waste of sewage work, and these mud contain a large amount of microorganisms, pathogenic agent, are distributing stench, and what have also contains heavy metal, and the general policy that China disposes sludge treatment is " decrement, safety, a resource utilization ".Wanting reasonable treatment and disposal mud problem, primarily is that moisture is lowered.If sludge water content is reduced to 40% from 97%, its volume reduction rate can reach 0.05.For the mud of burning disposal, because each kg of water is advanced the furnace gas burning and needed in-fighting 800～1000 kilocalorie heats approximately, regardless of which kind of type of furnace this is a unalterable quota, just can reduce combustion-supporting hear rate greatly if the stokehold reduces moisture.And mud is used for brickmaking, potting grain as building materials, and moisture also need reduce to 40%～60%, just can implement later process, and in a word, the dehydration of the height of mud is crucial.For the moisture that how to reduce in the mud, this is current puzzled always in the industry problem, and the dehydration of mud has a basic demand should reduce moisture exactly, but can not destroy the protista in the mud, it be not in general sense " oven dry " but mummification.So-called " mummification " is meant that the medium oxygen level can not be greater than 4%, and temperature can not be higher than 180 ℃.Sludge drying commonly used, dehydration roughly have following several types in the present industry of China:
1, heating power mummification: the finding mode is many in the city at present, for example turns round sleeve mummification, garden dish desiccation machine, low temperature fluidized-bed, paddle drying machine, fume afterheat mummification etc.But which kind of form that don't work all is to remove moisture and do not destroy mud Central Plains tax calorific value with heat energy, is with energy replacement therefore, be " with hot heat exchange ", and be " little to put greatly ", but this is unallowed on technical concept.Result in real world applications is that efficient is low, investment is big, the running cost height.Though application is arranged in the market, this is caving-in bash.
2, mechanical dehydration: common mechanical dehydration has filter press, centrifuge dehydration, belt filter-press dehydration, screw press etc. in the city at present.All this types, the whole moisture of the mud after the dehydration is all about 75%-90%, and it is not thorough to subtract appearance, and moisture descends not remarkable, and the terminal resource utilization is still difficult.Same disadvantage is that investment is big, the running cost height, and effect is undesirable, and tool may to the recycling in road, back.
3, the thermal machine stack combinations is taken off: as mechanical balling-up, heating power mummification, also can see on the market.But this method only is to have improved a point efficiency in a certain link of original base, does not solve the problem of essence.Though having surplus heat under given conditions of having is available, this dependence limitation to heat is very big, 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.Therefore occur some indivedual examples on the market and only be special case, say generally to promote to be difficult to realize.
Summary of the invention
The present invention solves the deficiencies in the prior art, a kind of less energy-consumption is provided, can effectively reduces prescription that is used for the mud height dehydration and drying of sludge water content and preparation method thereof.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of prescription that is used for the mud height dehydration and drying comprises following batching: 0.00025～0.0025 part of 0.000002～0.00001 part of organic polymer coargulator, 0.00025～0.0025 part of coagulation properties-correcting agent, 0.0005～0.00375 part of bactericidal deodorant and nucleation transforming agent.
As preferably, 0.0003～0.002 part of 0.0000025～0.000008 part of described organic polymer coargulator, 0.0003～0.002 part of coagulation properties-correcting agent, 0.00055～0.0035 part of bactericidal deodorant and nucleation transforming agent.
As preferably, described organic polymer coargulator is a cationic polyacrylamide; Described coagulation properties-correcting agent is bodied ferric sulfate; Described bactericidal deodorant is a unslaked lime; Described nucleation transforming agent is the shale breeze.
A kind of preparation method of mud height dehydration and drying, press following processing step:
(1), mud gravity concentrates preliminary hydro-extraction:
Will be after sewage work handles, form water ratio and be 95%～99% mud and enter into the gravity concentration basin, in transport pipe, add cationic polyacrylamide, behind line-blending, take out to rise and send into the gravity concentration basin, the ion degree of cationic polyacrylamide is 5%～40%, can determine to select for use suitable cationic polyacrylamide model according to mud flocculation sediment lab scale situation, the add-on of cationic polyacrylamide is 0.0002～0.001%, mud carries out preliminary solid-liquid separation in the gravity concentration basin, the water ratio that concentrates back mud is 92%～96%, realize preliminary sludge reduction, the supernatant liquor that is separated is back to Sewage treatment systems;
Will be after sewage work to handle, moisture 95%～99% mud utilizes gravity to concentrate and sloughs the part free water, make moisture percentage in sewage sludge reach 92%～96%, reduce sludge volume, realize preliminary sludge reduction, to alleviate the operating pressure of subsequent handling, can satisfy the requirement of mechanical transport and stirring again.Organic polymer coargulator---cationic polyacrylamide, the ion degree of cationic polyacrylamide requires 5%～40%, determine the cationic polyacrylamide model of employing according to sludge quality, in the gravity concentration basin, carry out preliminary solid-liquid separation, reduce sludge volume, improve the sewage sludge solid substrate concentration, the water ratio that concentrates back mud is 92%～96%, realizes preliminary sludge reduction.
(2), sludge conditioning:
1. after step (1), in mud, add bodied ferric sulfate, bodied ferric sulfate is added in the gravity concentration basin by dosing pump, use magnetic flow meter to measure, the add-on of bodied ferric sulfate is 0.1%～1.0% of a sludge quantity, after the Fe3+ hydrolysis in the bodied ferric sulfate, can destroy the charge balance in the mud micelle, its hydrolysate can be with organism in the mud and heavy metal ion polymerization and is generated colloid hydroxy polymer or precipitation of hydroxide.
2. add unslaked lime through step after 1. in the gravity concentration basin, unslaked lime adds after by the electronic scale metering of being furnished with in the lime jar automatically, and the add-on of unslaked lime is 0.2%～1.5% of a sludge quantity;
3. through step 2. after in the gravity concentration basin shale breeze, the shale breeze adds after by the metering of the electronic scale be furnished with in the storage tank automatically, calculates by mass percentage, the add-on of shale breeze is 0.1%～1.0% of a sludge quantity;
Elder generation's polyaddition ferric sulfate can destroy the charge balance of mud, then with the adding of unslaked lime, PH progressively brings up to 12～13, after the further hydrolysis of Fe3+ in the bodied ferric sulfate, can destroy the charge balance in the mud micelle, its hydrolysate can be with organism in the mud and heavy metal ion polymerization and is generated colloid hydroxy polymer or precipitation of hydroxide.Unslaked lime mainly is deodorization and sterilization and improves PH that adding the shale breeze at last provides skeleton function, makes the mud nucleation.
4. be incorporated in the agitated pool through the mud of step after 3. and fully stir, make mud and coagulation properties-correcting agent, bactericidal deodorant, nucleation transforming agent thorough mixing even;
Method by chemical modification is carried out pre-treatment to the very difficult mud of dehydration, abolish microbial cell wall in the mud, reduce sludge water and sewage sludge solid particulate bonding force, discharge water in combination water, planar water and the cell, improve the dewatering of mud, the accelerate sludge dehydration.
Irreducible water in the mud is adsorbed by solid particulate or is wrapped in cell interior, its peripheral quilt of the water molecules of so-called " constraint " very powerful negative charge is fastening, positive charge in it and water are examined averages out, make dehydration difficult, and can produce multiple high-order and multinuclear complexing ion after the bodied ferric sulfate hydrolysis, big a lot of with specific surface, have enough positively charged ions can with its displacement, the mud colloidal solid is electrically neutralized, reduce current potential, destroyed the positive negative balance of former water nuclear and caused Jie to take off constraint formation " freedom ", made the mechanism filter-pressing water outlet become possibility.And the Fe3+ hydrolysis ability in the bodied ferric sulfate is strong, and along with the raising of Ph, its hydrolysate will polymerization and generated colloid hydroxy polymer or precipitation of hydroxide.The ironic hydroxide that is precipitated out (Fe(OH) 3) finely divided solid matter and colloidalmaterial in the energy planar water, as clay and humic acid etc., it can effectively control foul smell to the oxidation of reducing gas hydrogen sulfide, therefore has decolouring, degerming except that functions such as radioactivity, deodorizing.Unite use with the CaO of back, can be heavy metal-passivated, play the effect that removes heavy metal.
The unslaked lime main component is CaO, and contains with small quantities of calcium carbonate, a spot of lime carbonate of magnesia and some trace elements., magnesium oxide and some trace elements.It has a relatiCaO can with the moisture generation thermopositive reaction in the mud, generate alkaline matter Ca (OH) 2, by improving the pH value and the hydrolysis heat release of mud, can destroy cell tissue and grease based on the cell walls of protein and enzyme, acid RNA, carbohydrate, thereby reach germ-resistant effect, kill microorganisms a large amount of in the mud and bacteriums such as intestinal bacteria, Salmonellas, the mud temperature improves favourable microorganism self hydrolysis.The CaO that adds can also make " binding force " that water molecules is subjected in the mud reduce except the effect that can play deodorization and sterilization, makes the mechanism filter-pressing water outlet become possibility.The added bodied ferric sulfate combined action in CaO and front can form harmless compound and reach heavy metal-passivated ionic effect in conjunction with the part metals ion in the mud, can significantly reduce heavy metal content in the dehydrated sludge cake.
Shale is a kind of natural ore, contain a large amount of organic microbials in the mud, chemical agent conditioning by the front changes sludge characteristics, makes the mud height dehydration become possibility, but the impossible natural separation of the moisture in the mud, must carry out press filtration by machinery, utilize and increase pressure, further destroy the mud structure sludge pressing, the mud height dehydration is become a reality, reach the purpose of reducing sludge volume, mummification.And physical propertys such as the intrinsic thickness of mud, snappiness are unfavorable for directly press filtration of machinery, must consider the requirement of sludge press filtration bearing capacity, and external facts have proved, only form skeleton in mud mechanism filter-pressing is carried out smoothly.Add the shale minerals powder, not only can play absorption, help coagulate, effect such as deodorizing, can also nucleation play skeleton function, help to improve press filtration efficient, further reduce the moisture in the sludge dewatering mud cake, improve the dehydrated sludge cake performance, for road, back thorough disposal or recycling in proper order creates conditions.
Fully stir at stirred pot, mud and cationic polyacrylamide, bodied ferric sulfate, unslaked lime are mixed, each effect of forming of performance improves dewatering efficiency.
(3), mechanism filter-pressing:
1. after step (2), squeeze in the autoclave diaphragm pressure filter with fresh feed pump with the mud that spiral pump is good with modifier treatment, advancing mud pressure is 0.60Mpa～0.80Mpa, the filtering unit that utilizes screen plate in the autoclave diaphragm pressure filter, diaphragm plate and filter cloth to form, compress at oil cylinder under the condition of filter plate, material is carried out preliminary solid-liquid separation, when to advance mud pressure be 0.85MPa～1.0Mpa with fresh feed pump pressure, stop into mud, this moment, mud formed sludge filter cake;
2. through step 1. after, in the diaphragm cavity of autoclave diaphragm pressure filter, feed pressurized air, mud in the filter chamber is fully squeezed, utilize the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, make the further mummification of sludge filter cake, time of filter pressing is 10～20min, pressure remains on 2～15Mpa, and this moment, the sludge filter cake water ratio was 40%～60%;
3. through step 2. after, removal pressure, open the autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by the dump system by the blow-removing system in the autoclave diaphragm pressure filter, sludge filter cake is deposited in indoor naturally, stack thickness at 0.5～1.0 meter, make sludge filter cake moisture under state of nature continue evaporation, left standstill 2～5 days, this moment, the water ratio of sludge filter cake was 20%～40%, and the sludge filter cake mud cake is fragmented into particulate state naturally; Sludge filter cake does not need sunlight to be exposed to the sun, but can not allow filter cake drench.
(4), filtrate refluxes:
Filtrate in the press filtration all is back in the step (1).
Basic technique principle foundation of the present invention:
Moisture in the mud is to be zoogloea and suspended solids formation colloidal structure, and it composes water branch can be divided into fissure water and irreducible water.Because the structure of mud granule surface property and mud group determines, the mud granule surface adsorption is secreted in its metabolic process in the extracellular polymeric of cells in vitro etc. by various charged ions and by microorganism and is formed.These charged ions and extracellular polymeric have very strong retentiveness.These mud granules have been formed mud group, form various capillary channels, therefore, mud is except fissure water, in addition water of all being held by the mud granule surface by quite a few moisture and the water in the capillary channel are formed, these all are combination water, general mud fissure water accounts for about 70%, all the other are about 30%, because mud has high-hydrophilic, not only the combination water of this constraint is to remove with simple mechanical process, is exactly that most fissure water can not can dewater with mechanical expression simply.Therefore, make mud height dehydration, the one, improve the water rate of fissure water, the 2nd, 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, the sludge dewatering with moisture 75%～99% obtains moisture 40% semi-dry sludge, for road, back thorough disposal or recycling in proper order creates conditions.
By mechanical supercharging, the mud through chemical conditioning is carried out high-pressure compressing, under the high pressure effect, further destroy microorganism cells in the mud, the moisture in the mud is deviate from, realize solid-liquid separation, reach mud height dehydration, mummification purpose.
Adopt the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, further destroy microorganism cells in the mud, change the mud structure, the moisture height in the mud is removed, realize solid-liquid separation, reach the sludge drying purpose.
The dehydrated sludge filter cake is harder, is block, does not need other drying and other treatment, significantly reduces mud and stacks the place.Filter cake is met water and is not restored, and has hydrophobicity, and moisture continues evaporation under state of nature, and mud cake is fragmented into particulate state naturally, is realizing that the objectionable impurities in the mud also is able to " stabilization " in " minimizing ".
Contain abundant carbon source in the filtrate in the press filtration, water outlet COD value is at 1200mg/L, BOD5 about 800mg/L, the organic content height, biodegradability is good.The Ph value that goes out filter liquor for the biological treatment of carrying out sewage provides basicity, helps the carrying out of biological sewage treatment about 12.Go out filter liquor and contain Fe3+, can improve dephosphorization efficiency by using.In addition, filtrate is back to the concentrated effect that the gravity concentration basin can significantly improve mud.
Mud behind the mechanical dehydration, since moisture about 75%-90%, need not carry out concentration, directly carry out sludge conditioning and high pressure press filtration operation.In order to improve the transportation performance of mud, when carrying out concentration, should add portion water, after production line goes into to use, the part filtrate after the press filtration can be introduced, temporarily improve moisture percentage in sewage sludge to 92%～96%.
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 mud is carried out modification, organism such as residual polymeric flocculant is decomposed lose effectiveness, and kill various bacteria and microorganism in the mud, decompose cell walls, liberation irreducible water, under the high pressure effect, remove moisture smoothly, mud height dehydration with moisture 75%～99%, obtain moisture 40%～60% semi-dry sludge, really realize the requirement of sludge treatment decrement, for road, back thorough disposal or recycling in proper order creates conditions.2., entire treatment process cold conditions operation, noiselessness does not have the exhaust emissions that the heating of burning causes, and does not rely on any ambient conditions, does not need thermal source, does not more consume primary energy source, effectively reduces energy consumption.Only have press filtration water backflow Sewage Plant to handle, working conditions and environmental interface are extremely good, meet to satisfy safety, civilized operational requirement.3., dewatered sludge chance water does not restore.Have hydrophobicity, and moisture continues evaporation under state of nature, mud cake is fragmented into particulate state naturally, is realizing that the objectionable impurities in the mud also is able to " stabilization " in " minimizing ".4. be not influence the original element of mud to constitute.Sewage sludge solid is increment not, does not also lose calorific value.
As preferably, by following processing step:
(1), mud gravity concentrates preliminary hydro-extraction:
Will be after sewage work handles, form water ratio and be 95.5%～98.5% mud and enter into the gravity concentration basin, in transport pipe, add cationic polyacrylamide, behind line-blending, take out to rise and send into the gravity concentration basin, the ion degree of cationic polyacrylamide is 5%～40%, the add-on of cationic polyacrylamide is 0.00025～0.0008%, mud carries out preliminary solid-liquid separation in the gravity concentration basin, the water ratio that concentrates back mud is 92.5%～95.5%, realize preliminary sludge reduction, the supernatant liquor that is separated is back to Sewage treatment systems;
(2), sludge conditioning:
1. after step (1), add bodied ferric sulfate in mud, bodied ferric sulfate is added in the gravity concentration basin by dosing pump, uses magnetic flow meter to measure, and the add-on of bodied ferric sulfate is 0.11%～0.99% of a sludge quantity;
2. add unslaked lime through step after 1. in the gravity concentration basin, unslaked lime adds after by the electronic scale metering of being furnished with in the lime jar automatically, and the add-on of unslaked lime is 0.21%～1.48% of a sludge quantity, and the Ph value in the pollution progressively brings up to 12～13;
3. through step 2. after in the gravity concentration basin shale breeze, the shale breeze adds after by the metering of the electronic scale be furnished with in the storage tank automatically, calculates by mass percentage, the add-on of shale breeze is 0.11%～0.99% of a sludge quantity;
4. be incorporated in the agitated pool through the mud of step after 3. and fully stir, make mud and cationic polyacrylamide, bodied ferric sulfate, unslaked lime thorough mixing even;
(3), mechanism filter-pressing:
1. after step (2), squeeze in the autoclave diaphragm pressure filter with fresh feed pump with the mud that spiral pump is good with modifier treatment, advancing mud pressure is 0.61Mpa～0.79Mpa, the filtering unit that utilizes screen plate in the autoclave diaphragm pressure filter, diaphragm plate and filter cloth to form, compress at oil cylinder under the condition of filter plate, material is carried out preliminary solid-liquid separation, when to advance mud pressure be 0.86MPa～0.99Mpa with fresh feed pump pressure, stop into mud, this moment, mud formed sludge filter cake;
2. through step 1. after, in the diaphragm cavity of autoclave diaphragm pressure filter, feed pressurized air, mud in the filter chamber is fully squeezed, utilize the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, make the further mummification of sludge filter cake, time of filter pressing is 10～20min, pressure remains on 2.1～14.9Mpa, and this moment, the sludge filter cake water ratio was 41%～59%;
3. through step 2. after, removal pressure, open the autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by the dump system by the blow-removing system in the autoclave diaphragm pressure filter, make sludge filter cake moisture under state of nature continue evaporation, sludge filter cake is deposited in indoor naturally, stacks thickness at 0.55～0.95 meter, leaves standstill 2.5～4.5 days, this moment, the water ratio of sludge filter cake was 21%～39%, and the sludge filter cake mud cake is fragmented into particulate state naturally;
(4), filtrate refluxes:
Filtrate in the press filtration all is back in the step (1).
Therefore, prescription that is used for the mud height dehydration and drying provided by the invention and preparation method thereof, serialization is handled, and improves processing efficiency, cuts down the consumption of energy controllability height, recycle.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1:
Pending sludge quantity is 1000 tons (about 1000 cubes), and moisture percentage in sewage sludge 99% adds medicament: 250 kilograms of 2 kilograms of cationic polyacrylamides, 250 kilograms of bodied ferric sulfates, 500 kilograms of unslaked limes and shale breezes.
(1), mud gravity concentrates preliminary hydro-extraction:
Will be after sewage work handles, form water ratio and be 99% mud and be incorporated into the gravity concentration basin for 1000 cubes, the adding ion degree is 30% cationic polyacrylamide in transport pipe, behind line-blending, take out to rise and send into the gravity concentration basin, the add-on of cationic polyacrylamide is 2 kilograms, mud carries out preliminary solid-liquid separation in the gravity concentration basin, the water ratio that concentrates back mud is 96%, and sludge volume is 250 cubes
, realize preliminary sludge reduction, the supernatant liquor that is separated is back to Sewage treatment systems;
(2), sludge conditioning:
1. after step (1), add bodied ferric sulfate in mud, bodied ferric sulfate is added in the gravity concentration basin by dosing pump, uses magnetic flow meter to measure, and the adding total amount of bodied ferric sulfate is 250 kilograms;
2. add unslaked lime through step after 1. in the gravity concentration basin, unslaked lime adds after by the electronic scale metering of being furnished with in the lime jar automatically, and the adding total amount of unslaked lime is 500 kilograms;
3. add the shale breeze through step after 2. in the gravity concentration basin, the shale breeze adds after by the electronic scale metering of being furnished with in the storage tank automatically, and the adding total amount of shale breeze is 250 kilograms;
4. be incorporated in the agitated pool through the mud of step after 3. and fully stir, make mud and cationic polyacrylamide, bodied ferric sulfate, unslaked lime thorough mixing even;
(3), mechanism filter-pressing:
1. after step (2), squeeze in the autoclave diaphragm pressure filter with fresh feed pump with the mud that spiral pump is good with modifier treatment, advancing mud pressure is 0.80Mpa, the filtering unit that utilizes screen plate in the autoclave diaphragm pressure filter, diaphragm plate and filter cloth to form, compress at oil cylinder under the condition of filter plate, material is carried out preliminary solid-liquid separation, when advancing mud pressure and be 1.0Mpa with fresh feed pump pressure, stop into mud, this moment, mud formed sludge filter cake;
2. through step 1. after, in the diaphragm cavity of autoclave diaphragm pressure filter, feed pressurized air, mud in the filter chamber is fully squeezed, utilize the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, make the further mummification of sludge filter cake, time of filter pressing is 20min, pressure remains on 2Mpa, and this moment, the sludge filter cake water ratio was 60%;
3. through step 2. after, removal pressure, open the autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by the dump system by the blow-removing system in the autoclave diaphragm pressure filter, make sludge filter cake moisture under state of nature continue evaporation, sludge filter cake is deposited in indoor naturally, stacks thickness at 1.0 meters, leaves standstill 5 days, this moment, the water ratio of sludge filter cake was 40%, and the sludge filter cake mud cake is fragmented into particulate state naturally;
(4), filtrate refluxes:
Filtrate in the press filtration all is back in the step (1).
Handle the back by the present invention: mud height that 1. will moisture 99% dewaters, obtain moisture 40% semi-dry sludge, volume reduces to 16.7 cubes from 1000 cubes, real realize the requirement of sludge treatment decrement, for the thorough method of disposal of mud such as the mud landfill in road, back, burning, brickmaking or recycling create conditions.2. entire treatment process cold conditions operation, noiselessness does not have the exhaust emissions that the heating of burning causes, and does not need thermal source, does not more consume primary energy source, effectively reduces energy consumption.3. dewatered sludge chance water does not restore.Have hydrophobicity, and moisture continues evaporation under state of nature, mud cake is fragmented into particulate state naturally, is realizing that the objectionable impurities in the mud also is able to " stabilization " in " minimizing ".4. not influencing the original element of mud constitutes.Sewage sludge solid is increment not, does not also lose calorific value, and the mud mud cake superior calorific value of water ratio 40% is about 1000 kilocalories.
Embodiment 2: pending sludge quantity is 1000 tons (about 1000 cubes), and moisture percentage in sewage sludge 99% adds medicament: 500 kilograms of 5 kilograms of cationic polyacrylamides, 500 kilograms of bodied ferric sulfates, 2000 kilograms of unslaked limes and shale breezes.
(1), mud gravity concentrates preliminary hydro-extraction:
Will be after sewage work handles, form water ratio and be 99% mud and be incorporated into the gravity concentration basin for 1000 cubes, the adding ion degree is 30% cationic polyacrylamide in transport pipe, behind line-blending, take out to rise and send into the gravity concentration basin, the add-on of cationic polyacrylamide is 5 kilograms, mud carries out preliminary solid-liquid separation in the gravity concentration basin, the water ratio that concentrates back mud is 94%, sludge volume is 167 cubes, realize preliminary sludge reduction, the supernatant liquor that is separated is back to Sewage treatment systems;
(3), sludge conditioning:
1. after step (1), add bodied ferric sulfate in mud, bodied ferric sulfate is added in the gravity concentration basin by dosing pump, uses magnetic flow meter to measure, and the adding total amount of bodied ferric sulfate is 500 kilograms;
2. add unslaked lime through step after 1. in the gravity concentration basin, unslaked lime adds after by the electronic scale metering of being furnished with in the lime jar automatically, and the adding total amount of unslaked lime is 2000 kilograms;
3. add the shale breeze through step after 2. in the gravity concentration basin, the shale breeze adds after by the electronic scale metering of being furnished with in the storage tank automatically, and the adding total amount of shale breeze is 500 kilograms;
4. be incorporated in the agitated pool through the mud of step after 3. and fully stir, make mud and cationic polyacrylamide, bodied ferric sulfate, unslaked lime thorough mixing even;
(4), mechanism filter-pressing:
1. after step (2), squeeze in the autoclave diaphragm pressure filter with fresh feed pump with the mud that spiral pump is good with modifier treatment, advancing mud pressure is 0.80Mpa, the filtering unit that utilizes screen plate in the autoclave diaphragm pressure filter, diaphragm plate and filter cloth to form, compress at oil cylinder under the condition of filter plate, material is carried out preliminary solid-liquid separation, when advancing mud pressure and be 1.0Mpa with fresh feed pump pressure, stop into mud, this moment, mud formed sludge filter cake;
2. through step 1. after, in the diaphragm cavity of autoclave diaphragm pressure filter, feed pressurized air, mud in the filter chamber is fully squeezed, utilize the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, make the further mummification of sludge filter cake, time of filter pressing is 20min, pressure remains on 5Mpa, and this moment, the sludge filter cake water ratio was 50%;
3. through step 2. after, removal pressure, open the autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by the dump system by the blow-removing system in the autoclave diaphragm pressure filter, make sludge filter cake moisture under state of nature continue evaporation, sludge filter cake is deposited in indoor naturally, stacks thickness at 1.0 meters, leaves standstill 5 days, this moment, the water ratio of sludge filter cake was 35%, and the sludge filter cake mud cake is fragmented into particulate state naturally;
(4), filtrate refluxes:
Filtrate in the press filtration all is back in the step (1).
Handle the back by the present invention: mud height that 1. will moisture 99% dewaters, obtain moisture 35% semi-dry sludge, volume reduces to 15.4 cubes from 1000 cubes, real realize the requirement of sludge treatment decrement, for the thorough method of disposal of mud such as the mud landfill in road, back, burning, brickmaking or recycling create conditions.2. entire treatment process cold conditions operation, noiselessness does not have the exhaust emissions that the heating of burning causes, and does not need thermal source, does not more consume primary energy source, effectively reduces energy consumption.3. dewatered sludge chance water does not restore.Have hydrophobicity, and moisture continues evaporation under state of nature, mud cake is fragmented into particulate state naturally, is realizing that the objectionable impurities in the mud also is able to " stabilization " in " minimizing ".4. not influencing the original element of mud constitutes.Sewage sludge solid is increment not, does not also lose calorific value, and the mud mud cake superior calorific value of water ratio 35% is about 1200 kilocalories.
Embodiment 3: pending sludge quantity is 1000 tons (about 1000 cubes), and moisture percentage in sewage sludge 99% adds medicament: 1500 kilograms of 10 kilograms of cationic polyacrylamides, 1500 kilograms of bodied ferric sulfates, 3750 kilograms of unslaked limes and shale breezes.
(1), mud gravity concentrates preliminary hydro-extraction:
Will be after sewage work handles, form water ratio and be 99% mud and be incorporated into the gravity concentration basin for 1000 cubes, the adding ion degree is 30% cationic polyacrylamide in transport pipe, behind line-blending, take out to rise and send into the gravity concentration basin, the ion degree 30% of cationic polyacrylamide, the add-on of cationic polyacrylamide is 2 kilograms, mud carries out preliminary solid-liquid separation in the gravity concentration basin, the water ratio that concentrates back mud is 92%, sludge volume is 125 cubes, realize preliminary sludge reduction, the supernatant liquor that is separated is back to Sewage treatment systems;
(4), sludge conditioning:
1. after step (1), add bodied ferric sulfate in mud, bodied ferric sulfate is added in the gravity concentration basin by dosing pump, uses magnetic flow meter to measure, and the adding total amount of bodied ferric sulfate is 1500 kilograms;
2. add unslaked lime through step after 1. in the gravity concentration basin, unslaked lime adds after by the electronic scale metering of being furnished with in the lime jar automatically, and the adding total amount of unslaked lime is 3750 kilograms;
3. add the shale breeze through step after 2. in the gravity concentration basin, the shale breeze adds after by the electronic scale metering of being furnished with in the storage tank automatically, and the adding total amount of shale breeze is 1500 kilograms;
4. be incorporated in the agitated pool through the mud of step after 3. and fully stir, make mud and cationic polyacrylamide, bodied ferric sulfate, unslaked lime thorough mixing even;
(5), mechanism filter-pressing:
1. after step (2), squeeze in the autoclave diaphragm pressure filter with fresh feed pump with the mud that spiral pump is good with modifier treatment, advancing mud pressure is 0.80Mpa, the filtering unit that utilizes screen plate in the autoclave diaphragm pressure filter, diaphragm plate and filter cloth to form, compress at oil cylinder under the condition of filter plate, material is carried out preliminary solid-liquid separation, when advancing mud pressure and be 1.0Mpa with fresh feed pump pressure, stop into mud, this moment, mud formed sludge filter cake;
2. through step 1. after, in the diaphragm cavity of autoclave diaphragm pressure filter, feed pressurized air, mud in the filter chamber is fully squeezed, utilize the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, make the further mummification of sludge filter cake, time of filter pressing is 20min, pressure remains on 10Mpa, and this moment, the sludge filter cake water ratio was 43%;
3. through step 2. after, removal pressure, open the autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by the dump system by the blow-removing system in the autoclave diaphragm pressure filter, make sludge filter cake moisture under state of nature continue evaporation, sludge filter cake is deposited in indoor naturally, stacks thickness at 1.0 meters, leaves standstill 5 days, this moment, the water ratio of sludge filter cake was 27%, and the sludge filter cake mud cake is fragmented into particulate state naturally.
(4), filtrate refluxes:
Filtrate in the press filtration all is back in the step (1).
Handle the back by the present invention: mud height that 1. will moisture 99% dewaters, obtain moisture 40% semi-dry sludge, volume reduces to 13.7 cubes from 1000 cubes, real realize the requirement of sludge treatment decrement, for the thorough method of disposal of mud such as the mud landfill in road, back, burning, brickmaking or recycling create conditions.2. entire treatment process cold conditions operation, noiselessness does not have the exhaust emissions that the heating of burning causes, and does not need thermal source, does not more consume primary energy source, effectively reduces energy consumption.3. dewatered sludge chance water does not restore.Have hydrophobicity, and moisture continues evaporation under state of nature, mud cake is fragmented into particulate state naturally, is realizing that the objectionable impurities in the mud also is able to " stabilization " in " minimizing ".4. not influencing the original element of mud constitutes.Sewage sludge solid is increment not, does not also lose calorific value, and the mud mud cake superior calorific value of water ratio 40% is about 1570 kilocalories.
Claims (5)
1. prescription that is used for the mud height dehydration and drying is characterized in that comprising following batching: 0.00025～0.0025 part of 0.000002～0.00001 part of organic polymer coargulator, 0.00025～0.0025 part of coagulation properties-correcting agent, 0.0005～0.00375 part of bactericidal deodorant and nucleation transforming agent.
2. a kind of prescription that is used for the mud height dehydration and drying according to claim 1 is characterized in that comprising following batching: 0.0003～0.002 part of 0.0000025～0.000008 part of described organic polymer coargulator, 0.0003～0.002 part of coagulation properties-correcting agent, 0.00055～0.0035 part of bactericidal deodorant and nucleation transforming agent.
3. a kind of prescription that is used for the mud height dehydration and drying according to claim 1 and 2 is characterized in that: described organic polymer coargulator is a cationic polyacrylamide; Described coagulation properties-correcting agent is bodied ferric sulfate; Described bactericidal deodorant is a unslaked lime; Described nucleation transforming agent is the shale breeze.
4. the preparation method of a mud height dehydration and drying is characterized in that by following processing step:
(1), mud gravity concentrates preliminary hydro-extraction:
Will be after sewage work handles, form water ratio and be 95%～99% mud and enter into the gravity concentration basin, in transport pipe, add cationic polyacrylamide, behind line-blending, take out to rise and send into the gravity concentration basin, the ion degree of cationic polyacrylamide is 5%～40%, the add-on of cationic polyacrylamide is 0.0002～0.001%, mud carries out preliminary solid-liquid separation in the gravity concentration basin, the water ratio that concentrates back mud is 92%～96%, realize preliminary sludge reduction, the supernatant liquor that is separated is back to Sewage treatment systems;
(2), sludge conditioning:
1. after step (1), add bodied ferric sulfate in mud, bodied ferric sulfate is added in the gravity concentration basin by dosing pump, uses magnetic flow meter to measure, and the add-on of bodied ferric sulfate is 0.1%～1.0% of a sludge quantity;
2. add unslaked lime through step after 1. in the gravity concentration basin, unslaked lime adds after by the electronic scale metering of being furnished with in the lime jar automatically, and the add-on of unslaked lime is 0.2%～1.5% of a sludge quantity, and the Ph value in the pollution progressively brings up to 12～13;
3. through step 2. after in the gravity concentration basin shale breeze, the shale breeze adds after by the metering of the electronic scale be furnished with in the storage tank automatically, calculates by mass percentage, the add-on of shale breeze is 0.1%～1.0% of a sludge quantity;
4. be incorporated in the agitated pool through the mud of step after 3. and fully stir, make mud and cationic polyacrylamide, bodied ferric sulfate, unslaked lime thorough mixing even;
(3), mechanism filter-pressing:
1. after step (2), squeeze in the autoclave diaphragm pressure filter with fresh feed pump with the mud that spiral pump is good with modifier treatment, advancing mud pressure is 0.60Mpa～0.80Mpa, the filtering unit that utilizes screen plate in the autoclave diaphragm pressure filter, diaphragm plate and filter cloth to form, compress at oil cylinder under the condition of filter plate, material is carried out preliminary solid-liquid separation, when to advance mud pressure be 0.85MPa～1.0Mpa with fresh feed pump pressure, stop into mud, this moment, mud formed sludge filter cake;
2. through step 1. after, in the diaphragm cavity of autoclave diaphragm pressure filter, feed pressurized air, mud in the filter chamber is fully squeezed, utilize the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, make the further mummification of sludge filter cake, time of filter pressing is 10～20min, pressure remains on 2～15Mpa, and this moment, the sludge filter cake water ratio was 40%～60%;
3. through step 2. after, removal pressure, open the autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by the dump system by the blow-removing system in the autoclave diaphragm pressure filter, make sludge filter cake moisture under state of nature continue evaporation, sludge filter cake is deposited in indoor naturally, stacks thickness at 0.5～1.0 meter, leaves standstill 2～5 days, this moment, the water ratio of sludge filter cake was 20%～40%, and the sludge filter cake mud cake is fragmented into particulate state naturally;
(4), filtrate refluxes:
Filtrate in the press filtration all is back in the step (1).
5. the preparation method of a kind of mud height dehydration and drying according to claim 4 is characterized in that by following processing step:
(1), mud gravity concentrates preliminary hydro-extraction:
Will be after sewage work handles, form water ratio and be 95.5%～98.5% mud and enter into the gravity concentration basin, in transport pipe, add cationic polyacrylamide, behind line-blending, take out to rise and send into the gravity concentration basin, the ion degree of cationic polyacrylamide is 5%～40%, the add-on of cationic polyacrylamide is 0.00025～0.0008%, mud carries out preliminary solid-liquid separation in the gravity concentration basin, the water ratio that concentrates back mud is 92.5%～95.5%, realize preliminary sludge reduction, the supernatant liquor that is separated is back to Sewage treatment systems;
(3), sludge conditioning:
1. after step (1), add bodied ferric sulfate in mud, bodied ferric sulfate is added in the gravity concentration basin by dosing pump, uses magnetic flow meter to measure, and the add-on of bodied ferric sulfate is 0.11%～0.99% of a sludge quantity;
2. add unslaked lime through step after 1. in the gravity concentration basin, unslaked lime adds after by the electronic scale metering of being furnished with in the lime jar automatically, and the add-on of unslaked lime is 0.21%～1.48% of a sludge quantity, and the Ph value in the pollution progressively brings up to 12～13;
3. through step 2. after in the gravity concentration basin shale breeze, the shale breeze adds after by the metering of the electronic scale be furnished with in the storage tank automatically, calculates by mass percentage, the add-on of shale breeze is 0.11%～0.99% of a sludge quantity;
4. be incorporated in the agitated pool through the mud of step after 3. and fully stir, make mud and cationic polyacrylamide, bodied ferric sulfate, unslaked lime thorough mixing even;
(4), mechanism filter-pressing:
1. after step (2), squeeze in the autoclave diaphragm pressure filter with fresh feed pump with the mud that spiral pump is good with modifier treatment, advancing mud pressure is 0.61Mpa～0.79Mpa, the filtering unit that utilizes screen plate in the autoclave diaphragm pressure filter, diaphragm plate and filter cloth to form, compress at oil cylinder under the condition of filter plate, material is carried out preliminary solid-liquid separation, when to advance mud pressure be 0.86MPa～0.99Mpa with fresh feed pump pressure, stop into mud, this moment, mud formed sludge filter cake;
2. through step 1. after, in the diaphragm cavity of autoclave diaphragm pressure filter, feed pressurized air, mud in the filter chamber is fully squeezed, utilize the diaphragm pressing technology that sludge filter cake is carried out high-pressure compressing, under the high pressure effect, make the further mummification of sludge filter cake, time of filter pressing is 10～20min, pressure remains on 2.1～14.9Mpa, and this moment, the sludge filter cake water ratio was 41%～59%;
3. through step 2. after, removal pressure, open the autoclave diaphragm pressure filter, sludge filter cake is come off, and be transported to follow-up workshop by the dump system by the blow-removing system in the autoclave diaphragm pressure filter, make sludge filter cake moisture under state of nature continue evaporation, sludge filter cake is deposited in indoor naturally, stacks thickness at 0.55～0.95 meter, leaves standstill 2.5～4.5 days, this moment, the water ratio of sludge filter cake was 21%～39%, and the sludge filter cake mud cake is fragmented into particulate state naturally;
(4), filtrate refluxes:
Filtrate in the press filtration all is back in the step (1).
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