CN106495414A - A kind of city sewage deep treatment method - Google Patents

A kind of city sewage deep treatment method Download PDF

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Publication number
CN106495414A
CN106495414A CN201611150472.0A CN201611150472A CN106495414A CN 106495414 A CN106495414 A CN 106495414A CN 201611150472 A CN201611150472 A CN 201611150472A CN 106495414 A CN106495414 A CN 106495414A
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sludge
mud
sewage
treatment method
deep treatment
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CN201611150472.0A
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CN106495414B (en
Inventor
林�智
武祯
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Keda Manufacturing Co., Ltd
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Keda Clean Energy Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/06Sludge reduction, e.g. by lysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/24Separation of coarse particles, e.g. by using sieves or screens
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a kind of city sewage deep treatment method, comprises the following steps:Step one:By sewage by grid remove impurity, sand setting, primary deposition, biological treatment and secondary precipitation so that sewage and sludge initial gross separation;Step 2:Sewage after processing through step one is processed sewage using physics, chemical or biological method, discharge index discharge after disinfection, is reached;Step 3:Sludge after processing through step one is carried out physical wall breaking using grinding, then chemical breaking cellular wall deodorization is carried out by chemical reagent, last filter-press dehydration, the sludge after filter pressing are discharged, reclaimed the water after filter pressing and processed with step 2 again.Using the present invention, can effective deodorizing sterilizing, the moisture content of sludge substantially reduces, and operating cost is low.

Description

A kind of city sewage deep treatment method
Technical field
A kind of the present invention relates to technical field of sewage disposal, more particularly to city sewage deep treatment method.
Background technology
Municipal sewage is all drainings that is collected by sewer pipe, is the various lives dirts for entering sewer pipeline system The mixing water of water, industrial wastewater and urban rainfall runoff.Sanitary sewage be in people's daily life discharge water, this kind of sewage Water quality characteristicses be containing higher Organic substance, such as starch, protein, oils and fatss etc., and nitrogen, phosphorus, etc. inorganic matters, additionally, also Containing pathogenic microorganism and more float.Industrial wastewater is compared to, the water quality of sanitary sewage is typically more stable, concentration Relatively low.Industrial wastewater be in production process discharge waste water, including production technology waste water, recirculated cooling water, flushing waste water and Comprehensive wastewater.Due to various industrial techniques, raw material, the difference for using the watering condition of equipment etc., industrial wastewater Property varies.Rainfall runoff is formed by precipitation or ice dissolution.For laying sewage conduct and storm sewer respectively City, rainfall runoff import storm sewer, for using rain sewage combined sewerage pipeline city, can make rainfall runoff with Municipal sewage is together acted upon.
Existing urban sewage treatment process flow process is as shown in figure 1, municipal sewage retains larger floating thing by grid Or float, inorganic particle larger for proportion is stayed in bottom of pond through aerated grit chamber and primary sedimentation pond, recycle microorganism Metabolism organic pollution is converted into innocuous substance, by secondary sedimentation tank remove biological treatment process in produced by , with sludge form exist biological cast or death organism.Collect aerated grit chamber, primary sedimentation pond and two The pool bottom sludge of secondary sedimentation tank carries out Treatment of Sludge and is allowed to meet discharge standard.
The step of Treatment of Sludge:Sludge is sent into sludge concentration tank first, adopts sedimentation, Bubble-floating Method or centrifuging to drop Low moisture percentage in sewage sludge and minimizing sludge volume;Mud storage pool, conditioning of mud amount and added amount of chemical is entered after sludge condensation;Then, Digested under aerobic or anaerobic condition, make volatile content in sludge be reduced to solid and be relatively difficult to rot and do not send out evil Sludge when smelly;Finally, by the primary of fluidised form, concentration or digested sludge removing moisture, semisolid or solid-state clod are converted into.Through After crossing dehydration, moisture percentage in sewage sludge can be reduced to 80% or so.Sludge moisture content after dehydration is high, is difficult to recycle, and fills occupation of land amount Greatly.And sludge is dehydrated difficulty in itself, difficult mummification recycles mummification high cost, landfill to produce percolate.And have larger stench Taste, attracts mosquito, pollutes environment.
Do not have special deodorization process during municipal sewage treatment, the sludge produced in sewage disposal process is with smelly Taste, this is because containing the such as microorganism such as antibacterial, protozoacide and algae in sludge, causes sludge through long-term procreation Foul.Nowadays the deodorization mode for generally adopting is sludge mesophilic anaerobic digestion technique(As at a kind of sludge of CN104163553A Reason method), but the metabolic conversion time of microorganism is long, the methane and carbon dioxide tolerance of generation is few, is unfavorable for quick process Sludge.
In addition, the moisture content of municipal sludge up to more than 80%, after untreated sludge is directly filled, landfill yard Earth's surface can form marsh shape, and moisture content therein can slowly escape through the sludge leachate contamination water source and soil to form severe toxicity.Not The sludge of process is difficult by recycling, because water content is too high, as long as producing transport, then means greatly transport Cost is on moisture content(Water content 80% or so).And be sposh, very big difficulty is caused to transport.One of maximum of sludge Utilization orientation be burning electricity generation, and the moisture percentage in sewage sludge not processed is too high, will waste very big heat energy on evaporation moisture.
The process operating cost of sludge is high.At present, traditional method is nursed one's health by dosing coagulant, flocculation aid, Then mechanical dehydration is processed, and forming the walk outward transport that moisture content is 80% or so carries out sanitary landfills, burning disposal, fermentation system Fertilizer, this mode is because the too high surrounding enviroment to landfill yard of moisture content bring extremely disadvantageous impact or ability need to be further dried Enter incinerator to process and fermentation system fertilizer.But the moisture percentage in sewage sludge after mechanical dehydration is biological in sludge the reason for very high Cell and colloid contain substantial amounts of " Interstitial Water " cannot all be extruded by the pressure that traditional mechanical is dehydrated, while moisture percentage in sewage sludge At 80% or so in mucilage shape, hydrone is wrapped up by one layer of colloid, and this region is referred to as " the viscose glue phase region " of sludge, is dirty In the stage that mud dehydration is most difficult to, the method with traditional mechanical dehydration is it is difficult to further remove.So, it is necessary to it is special to take Means crack intercellular structure and sludge " viscose glue phase region " so that partly " Interstitial Water " is discharged, then by mechanism filter-pressing Mode is filtered.Existing wall breaking technology typically has technology, the Strong oxdiative medicament breaking cellular wall skill of high temperature drying technique, machinery and ultrasound wave Art.High temperature drying technique produces the harmful exhausts such as dioxin in sludge handling process, produces secondary pollution to environment.With machinery Cell wall breaking is carried out with the technology of ultrasound wave, in addition to equipment investment is larger, also needs to consume substantial amounts of electric power during operation.So, Operating cost is big.Sludge cell wall breakage method is carried out using Strong oxdiative medicament, due to the sludge concentration height of 80% moisture content, medicament It is difficult to fully be merged, addition is big, and cost is also high.After because adding chemical agent, may be to the subsequent treatment band of sludge Unfavorable factor is carried out.
Therefore, need badly and a kind of processing method of new municipal sewage is provided is removed with solving sludge during existing municipal sewage treatment The smelly time is long, is dehydrated the difficult technical problem of decrement.
Content of the invention
The technical problem to be solved is, there is provided a kind of city sewage deep treatment method, dirty after process The moisture content of mud is substantially reduced, and drying and dehydrating speed is fast.
The technical problem to be solved is also resided in, there is provided a kind of city sewage deep treatment method, effectively can be removed Smelly sterilization, sludge do not attract mosquito.
The technical problem to be solved is also resided in, there is provided a kind of city sewage deep treatment method, through processed Sewage can reach national sewage discharge one-level A standard.
In order to solve above-mentioned technical problem, the invention provides a kind of city sewage deep treatment method, including following step Suddenly:
Step one:By sewage by grid remove impurity, sand setting, primary deposition, biological treatment and secondary precipitation so that sewage and dirt Mud initial gross separation;
Step 2:Sewage after processing through step one is processed sewage using physics, chemical or biological method, after disinfection Reach discharge index discharge;
Step 3:Sludge after processing through step one is carried out physical wall breaking using grinding, then chemistry is carried out by chemical reagent Breaking cellular wall deodorization, last filter-press dehydration, the sludge after filter pressing are discharged, and are reclaimed the water after filter pressing and are processed with step 2 again.
Used as the optimal technical scheme of the city sewage deep treatment method, the step 3 specifically includes following step Suddenly:
A. the mud that collects is sent in collecting pit, then the larger granule of particle diameter in mud is removed by vibrosieve;
B. by vibrating shaker after mud send into stirring stock tank in, and by mud pumping quantitative slurry put into grinder in carry out Grinding, breaking cellular wall;
C. by grinding after mud send into reaction tank in, be initially charged chloride hydrochlorate, add sulfur-containing compound, chlorine-containing compound or Polymeric oxides remove the stink in mud, finally adopt in weak base and mud;
D. in mud, add flocculating setting agent to assemble the mud granule in mud;
E. being dehydrated mud after settlement by pressure filter causes the moisture content of sludge to be down to 25-60%, the sludge row after filter pressing Go out, reclaim the water after filter pressing and processed with step 2 again.
Used as the optimal technical scheme of the city sewage deep treatment method, the chloride hydrochlorate in step c is chlorine One kind or combination in sour sodium, sodium chlorite and sodium hypochlorite.
As the optimal technical scheme of the city sewage deep treatment method, sulfur-containing compound described in step c For sodium pyrosulfate, the one kind in sodium peroxydisulfate, aluminum sulfate, iron sulfate, polyaluminium sulfate, bodied ferric sulfate, PAFS Or combination.
As the optimal technical scheme of the city sewage deep treatment method, chlorine-containing compound described in step c For the one kind in aluminum chloride, iron chloride, sodium chloride, aluminium polychlorid, poly-ferric chloride, PAFC or combination.
As the optimal technical scheme of the city sewage deep treatment method, polymeric oxides described in step c For the one kind in polymer alumina, polymerization oxidation ferrum, polymerization oxidation ferro-aluminum or combination.
As the optimal technical scheme of the city sewage deep treatment method, the chloride hydrochlorate, sulfur-containing compound, contain The addition of chlorine compound or polymeric oxides is the 0.001-0.5% that collecting pit collects sludge weight.
Used as the optimal technical scheme of the city sewage deep treatment method, the vibrating screen mesh mesh number is 10-60 Mesh.
Used as the optimal technical scheme of the city sewage deep treatment method, the grinder includes ball mill, crushes Machine and sand mill.
Implement the embodiment of the present invention, have the advantages that:
City sewage deep treatment method of the present invention improves existing mud discharging processing method, using physical grinding breaking cellular wall and change Learn deodorization breaking cellular wall to combine, reduce sludge returning, realize the breaking cellular wall of coated structure, after chemical reagent with breaking cellular wall Sludge is fully contacted, and significantly, then filter-press dehydration makes the moisture content of sludge be down to 25-60% to deodorizing effect, through process after sludge Than drying and dehydrating speed before process faster.And find to can reach country through the sewage detection after the process of sewage discharge processing module Sewage discharge one-level A standard.
The workflow simple possible of whole sewage disposal system, without the need for hot conditionss and the large-scale instrument of costliness, operation Low cost;Also produce without new pollutant, it is to avoid cause secondary pollution;Environmental protection, safe and reliable.And process after sludge without Smelly, moisture content is low, greatly reduces the volume of sludge, saves sludge freight and processes landfill land used.
Description of the drawings
Fig. 1 is existing urban sewage treatment system process chart;
Fig. 2 is a kind of process chart of city sewage deep treatment method of the invention;
Fig. 3 is a kind of another process chart of city sewage deep treatment method of the invention.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing Step ground is described in detail.
City sewage deep treatment method of the present invention on the basis of existing sewage water treatment method, for prior art Sludge deodorization, bactericidal effect are poor, the high shortcoming of moisture percentage in sewage sludge, improve method for sludge treatment.
As shown in Fig. 2 the present invention provides a kind of city sewage deep treatment method, comprise the following steps:
S100, by sewage by grid remove impurity, sand setting, primary deposition, carries out a biological disposal upon and secondary precipitation is so that sewage and sludge Initial gross separation.
Grid remove impurity:In sewage treatment facility entrance, it is necessary to arrange grid, mainly using physical treatment process retention compared with Big floating thing or float, to mitigate the load of subsequent treatment structures, enable to run well.
Sediment by aeration:This operation is generally located in behind grid remove impurity, it is therefore an objective to remove the larger inorganic particle of proportion.
Primary deposition:Preliminary sedimentation tank has preferable removal effect to inorganic matters, is generally located in before biological treatment structures.
Bio-aeration:Using the metabolism of microorganism, will be in the organic pollution turn of dissolubility, colloidal state in sewage Innocuous substance is turned to, so as to reach the requirement of discharge.
Secondary precipitation:The major function of secondary precipitation is to remove produced by biological treatment process, deposited with sludge form Biological cast or dead organism.
Granule sedimentation in water all occurs in above-mentioned technological process during sediment by aeration, primary deposition and secondary precipitation Process, so as to form sludge in bottom of pond, realizes sewage purpose detached with sludge.Due to the discharge that sewage and sludge are had nothing in common with each other Standard and processing method, are therefore separately processed to sewage and sludge below by S101 and S102 steps.
S101, will process sewage through the sewage after S100 step process using physics, chemical or biological method, and sterilization is killed Discharge index discharge is reached after bacterium.
Physics, chemical or biological method is adopted to process to reach row in separated sewage out in the S101 steps Put index.Detection finds that sewage processed by the invention can reach national sewage discharge one-level A standard(GB 18918-2002), Disposed of in its entirety cost is 1/5th or so of conventional desliming cost of sewage disposal.
S102, will be carried out physical wall breaking through the sludge after S100 step process using grinding, then is carried out by chemical reagent Chemical breaking cellular wall deodorization, last filter-press dehydration, the sludge after filter pressing are discharged, and are reclaimed the water after filter pressing and are used S101 step process again.
Existing urban sewage treatment system generally for precipitation collect the sludge that obtains directly using sedimentation, Bubble-floating Method or Centrifuging then carries out processed to reduce moisture percentage in sewage sludge and reduce sludge volume, and when finally discharging, the moisture content of sludge is 80%, its deodorization process is digested under aerobic or anaerobic condition, makes volatile content in sludge be reduced to solid sludges phase Perishable over the ground and do not stink of, this kind of deodorization process digestion period is not long, and deodorizing effect is not good, be unfavorable for quick process dirty Mud.
Research worker finds that the high main cause of sludge moisture content after mechanical dehydration is because of biological cells in sludge and glue Body contains substantial amounts of " Interstitial Water " cannot all be extruded by the pressure that traditional mechanical is dehydrated, while moisture percentage in sewage sludge is 80% In mucilage shape during left and right, hydrone is wrapped up by one layer of colloid, and this region is referred to as " the viscose glue phase region " of sludge, is sludge dewatering The stage being most difficult to, the method with traditional mechanical dehydration are it is difficult to further remove.
For this purpose, the present inventor is obtained in detail below by cleverly design process flow and repetition test day and night Technical thought:
It is mud that in the present invention, Treatment of Sludge collects the sludge for obtaining, and the moisture content of mud reaches 80-98%, now due to aqueous Rate is high, and the good fluidity of mud, mud granule are may be homogenously dispersed in water.And the larger granule of particle diameter is removed after vibrosieve screening Go, the mud after filtration is put into grinder and is ground, on the one hand, the particle diameter of granule in mud can be reduced;On the other hand, flow The more preferable mud of dynamic property is more easy to realize breaking the above-mentioned coated formed by mud granule and water under the high frequency grinding of grinder Structure, allow hydrone can separate out, be separated from mud granule.The wound that the deodorization reagent that later stage adds is manufactured from breaking cellular wall It is fully contacted with mud granule, the effect is significant of deodorizing sterilizing.It is dehydrated finally by conventional filter-pressing process, sludge containing now Water rate as little as 25-60%, far below the moisture content of sludge 80% or so after the process of existing sludge treatment technique.
It should be noted that described grinder includes the ball millings such as ball mill, disintegrating machine, sand mill and disintegrating apparatus, depending on The concrete character of sludge carries out corresponding selection.
As shown in Fig. 2 the preferred version of city sewage deep treatment method of the present invention, comprises the following steps:
S200, by sewage by grid remove impurity, sand setting, primary deposition, carries out a biological disposal upon and secondary precipitation is so that sewage and sludge Initial gross separation.
S201, will process sewage through the sewage after S200 step process using physics, chemical or biological method, and sterilization is killed Discharge index discharge is reached after bacterium.
S202, the mud that collects is sent in collecting pit, then removes the larger granule of particle diameter in mud by vibrosieve.
Present invention sludge source to be dealt with is the sludge that each sedimentation tank bottom of pond is collected in sewage disposal process, with containing Water rate is high, and microorganism is more, and taste is smelly, and processing cost is high and the features such as difficult dehydration.The mud decrement effect difference of prior art is because Traditional wall breaking technology is difficult to the coated structure for destroying sludge, and therefore Direct Dehydration is difficult.The present invention does not but directly carry out dense Contracting dehydration, makes mud moisture content be retained in 80-98%(Depending on the sludge character of different regions), now the good fluidity of mud, dirty Mud granule can be well dispersed in water, so as to the grinding of next step mud.
S203, by vibrating shaker after mud send into stirring stock tank in, and by mud pumping quantitative slurry input grinding Be ground in machine, breaking cellular wall.
Some particle diameters larger granule also there is in mud, and the large-size particle such as input grinder can have a strong impact on and grind Mill effect, therefore for removing the larger granule of particle diameter in mud the step for setting, specifically, according to the property of different sludge Shape, may be selected the vibrating screen mesh mesh number in the range of 10-60 mesh.
The larger granule of the particle diameter that screens out delivers to slag bath, and the mud after filtering then delivers to stirring stock tank, is persistently stirring Under, the solid particle of mud can be suspended in water, it is to avoid lamination occur.
Will mud put into grinder in be ground, breaking cellular wall, on the one hand, the particle diameter of granule in mud can be reduced;The opposing party Face, the more preferable mud of mobility are more easy to realize breaking the above-mentioned bag formed by mud granule and water under the high frequency grinding of grinder Wrap up in type structure, allow hydrone can separate out, be separated from mud granule.Using the breaking cellular wall mode of the present invention, shell-broken effect More preferably, the dehydration rate of sludge is higher.
S204, by grinding after mud send in reaction tank, be initially charged chloride hydrochlorate, add sulfur-containing compound, chloride Compound or polymeric oxides remove the stink in mud, finally adopt in weak base and mud.
The mud that sends in reaction tank can pass through the parcel due to passing through grinding breaking cellular wall, the chemical reagent put in reaction tank Wound in type structure is fully contacted with the microorganism of inside, deodorization, sterilization.The chemical reagent release sequence of wherein reaction tank For:1st, chloride hydrochlorate;2nd, sulfur-containing compound, chlorine-containing compound or polymeric oxides;3rd, weak base.Chloride hydrochlorate has deodorizing sterilizing concurrently Effect, and response speed is especially fast, addition is few;Sulfur-containing compound and chlorine-containing compound are conventional deodorization reagent, and are polymerized Muriatic deodorizing effect is obvious.According to the sludge of different sewage treatment plant, composition performance is different, carries out different species and use The collocation of amount.It is eventually adding in a small amount of weak base and mud, while helping be dehydrated.
Preferably, chloride hydrochlorate is the one kind in sodium chlorate, sodium chlorite and sodium hypochlorite or combination.Sulfur-containing compound is Sodium pyrosulfate, one kind in sodium peroxydisulfate, aluminum sulfate, iron sulfate, polyaluminium sulfate, bodied ferric sulfate, PAFS or Combination.Chlorine-containing compound be aluminum chloride, iron chloride, sodium chloride, aluminium polychlorid, poly-ferric chloride, in PAFC A kind of or combination.Polymeric oxides are polymer alumina, polymerization oxidation ferrum, the one kind in polymerization oxidation ferro-aluminum or combination.More than , depending on sludge character, addition is generally the 0.001- of collecting pit sludge weight for the species of various chemical reagent selections and consumption 0.5%.As above chemical agent is all that sludge is being added after physical wall breaking, therefore, it is possible in the little situation of addition Under play the effect of good deodorizing sterilizing.
Sludge ammonia level after process can be reduced to original less than 20%, and hydrogen sulfide gas are substantially zeroed after testing, Produce without new pollutant simultaneously, it is to avoid secondary pollution is caused to environment.
S205, adds flocculating setting agent to assemble the mud granule in mud in mud.
The flocculating setting agent that the present invention is adopted mainly has Flokal B and cationic flocculant, depending on different sewage process The Sludge Property of factory, composition are different and select suitable flocculant species and consumption.
S206, mud after settlement is dehydrated by pressure filter and causes the moisture content of sludge to be down to 25-60%, after filter pressing Sludge discharge, reclaim filter pressing after water use S201 step process again.
Sludge is sent into by pressure filter by membrane pump, under the mechanical pressure that pressure filter is provided, sludge is enable with most in short-term Between, to greatest extent water in coated structure is discharged, the water of discharge is flowed in the materialization life processing pond of sewage discharge processing module, And sludge is then discharged.Detect the performance indications of the sludge that the sludge after finding through processed is obtained with former processing method to such as Under:
1st, the moisture percentage in sewage sludge after processed by the invention is down to 25-60% from 80%;
2nd, raw sewage at a temperature of 100 degree takes around more than 5 hours and could dry substantially, and the sludge after process is in 100 degree of temperature Under degree, just can dry completely within about 1.5 hours;
3rd, raw sewage can not dry under room temperature natural conditions substantially naturally, and after process, sludge is under room temperature natural conditions(27 DEG C, cloudy), just dry in the sun can do completely within about 5 hours;
4th, there is obvious maggot in raw sewage, attract mosquito, and foul smelling taste, the sludge after process there is no maggot, do not inhale in a large number Draw mosquito, and be destitute of smell substantially.
Sludge after dehydration, can be used as fermentation system fertilizer, and drying and dewatering is making fuel, it is also possible to add conduct after flyash Make environmental protection brick, the material of haydite.The decline of moisture content also greatly reduces the volume of sludge, saves sludge freight and place Reason landfill land used.
It should be noted that step S200 of the present invention and the concrete processing methods of S201 are same or similar, but due to existing The recycle-water that the sludge concentration tank of sewage water treatment method is produced contains the impurity such as more microorganism, the inorganic particle of floating, directly Carry out the emission treatment of sewage, it will be apparent that increase cost of sewage disposal and time;And the present invention is through physical grinding, chemistry Sewage discharge processing module is convergeed to again after deodorization, processing pressure is greatly reduced, and processed by the invention after sewage detection It was found that can reach national sewage discharge one-level A standard(GB 18918-2002), disposed of in its entirety cost is conventional desliming sewage disposal / 5th of cost or so.
Last should be noted that above example is only in order to illustrating technical scheme rather than protect to of the invention The restriction of shield scope, although being explained in detail to the present invention with reference to preferred embodiment, one of ordinary skill in the art should Understand, technical scheme can be modified or equivalent, without deviating from the essence of technical solution of the present invention And scope.

Claims (9)

1. a kind of city sewage deep treatment method, it is characterised in that comprise the following steps:
Step one:By sewage by grid remove impurity, sand setting, primary deposition, biological treatment and secondary precipitation so that sewage and dirt Mud initial gross separation;
Step 2:Sewage after processing through step one is processed sewage using physics, chemical or biological method, after disinfection Reach discharge index discharge;
Step 3:Sludge after processing through step one is carried out physical wall breaking using grinding, then chemistry is carried out by chemical reagent Breaking cellular wall deodorization, last filter-press dehydration, the sludge after filter pressing are discharged, and are reclaimed the water after filter pressing and are processed with step 2 again.
2. city sewage deep treatment method as claimed in claim 1, it is characterised in that the step 3 specifically includes following step Suddenly:
A. the mud that collects is sent in collecting pit, then the larger granule of particle diameter in mud is removed by vibrosieve;
B. by vibrating shaker after mud send into stirring stock tank in, and by mud pumping quantitative slurry put into grinder in carry out Grinding, breaking cellular wall;
C. by grinding after mud send into reaction tank in, be initially charged chloride hydrochlorate, add sulfur-containing compound, chlorine-containing compound or Polymeric oxides remove the stink in mud, finally adopt in weak base and mud;
D. in mud, add flocculating setting agent to assemble the mud granule in mud;
E. being dehydrated mud after settlement by pressure filter causes the moisture content of sludge to be down to 25-60%, the sludge row after filter pressing Go out, reclaim the water after filter pressing and processed with step 2 again.
3. city sewage deep treatment method as claimed in claim 2, it is characterised in that the chloride hydrochlorate in step c is One kind or combination in sodium chlorate, sodium chlorite and sodium hypochlorite.
4. city sewage deep treatment method as claimed in claim 2, it is characterised in that sulfur-bearing chemical combination described in step c Thing is sodium pyrosulfate, in sodium peroxydisulfate, aluminum sulfate, iron sulfate, polyaluminium sulfate, bodied ferric sulfate, PAFS Plant or combine.
5. city sewage deep treatment method as claimed in claim 2, it is characterised in that chloride chemical combination described in step c Thing is aluminum chloride, iron chloride, sodium chloride, aluminium polychlorid, poly-ferric chloride, the one kind in PAFC or combination.
6. city sewage deep treatment method as claimed in claim 2, it is characterised in that polymerization oxidation described in step c Thing is polymer alumina, polymerization oxidation ferrum, the one kind in polymerization oxidation ferro-aluminum or combination.
7. city sewage deep treatment method as claimed in claim 2, it is characterised in that the chloride hydrochlorate, sulfur-containing compound, The addition of chlorine-containing compound or polymeric oxides is the 0.001-0.5% that collecting pit collects sludge weight.
8. city sewage deep treatment method as claimed in claim 2, it is characterised in that the vibrating screen mesh mesh number is 10- 60 mesh.
9. city sewage deep treatment method as claimed in claim 2, it is characterised in that the grinder includes ball mill, broken Broken machine and sand mill.
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