CN106495414B - 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
CN106495414B
CN106495414B CN201611150472.0A CN201611150472A CN106495414B CN 106495414 B CN106495414 B CN 106495414B CN 201611150472 A CN201611150472 A CN 201611150472A CN 106495414 B CN106495414 B CN 106495414B
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sludge
mud
sewage
treatment method
deep treatment
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CN106495414A (en
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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 methods, comprising the following steps: step 1: sewage being cleaned by grid, sand setting, primary deposition, biological treatment and secondary precipitation are so that sewage and sludge initial gross separation;Step 2: sewage will be handled using the method for physics, chemistry or biology through step 1 treated sewage, discharge index discharge is reached after disinfection and sterilization;Step 3: will carry out physical wall breaking using grinding through step 1 treated sludge, then carry out chemical broken wall deodorization by chemical reagent, last filter-press dehydration, the sludge discharge after filters pressing, and the water after recycling filters pressing is handled 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
The present invention relates to the technical field of sewage treatment more particularly to a kind of city sewage deep treatment methods.
Background technique
Municipal sewage is all drainings being collected by sewer pipe, is the various lives dirt for being discharged into sewer pipeline system The mixing water of water, industrial wastewater and urban rainfall runoff.Sanitary sewage is the water being discharged in people's daily life, this kind of sewage Water quality characteristics be containing higher organic matter, such as starch, protein, grease and nitrogen, phosphorus, etc. inorganic matters, in addition, also Contain pathogenic microorganism and more suspended matter.It is compared to industrial wastewater, the water quality of sanitary sewage is generally more stable, concentration It is lower.Industrial wastewater is the waste water being discharged in production process, including production technology waste water, recirculated cooling water, flushing waste water and Comprehensive wastewater.Due to various industrial techniques, raw material, using the difference of the watering condition of equipment etc., industrial wastewater Property is multifarious.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 pocessed together.
Existing urban sewage treatment process process is as shown in Figure 1, municipal sewage retains biggish floating material by grid Or suspended matter, the biggish inorganic particle of specific gravity is stayed in bottom of pond by aerated grit chamber and primary sedimentation pond, recycles microorganism Metabolism convert innocuous substance for organic pollutant, by secondary sedimentation tank remove biological treatment process in produced by , with biology cast existing for sludge form or dead organism.Collect aerated grit chamber, primary sedimentation pond and two The pool bottom sludge of secondary sedimentation basin carries out Treatment of Sludge and is allowed to meet discharge standard.
The step of Treatment of Sludge: sending sludge into sludge concentration tank first, uses sedimentation, gas floatation process or centrifugal process to drop Low moisture percentage in sewage sludge and reduction sludge volume;Enter mud storage pool, conditioning of mud amount and added amount of chemical after sludge condensation;Then, It is digested under aerobic or anaerobic condition, so that volatile content is reduced to solid and be relatively not easy to rot and do not send out evil Sludge when smelly;Finally, the primary of fluidised form, concentration or digested sludge are removed moisture, it is converted into semisolid or solid-state clod.Through After crossing dehydration, moisture percentage in sewage sludge can be reduced to 80% or so.Dewatered sludge moisture content is high, is not easy to recycle, and fills land occupation amount Greatly.And sludge itself is dehydrated difficulty, and difficult desiccation recycles desiccation at high cost, and landfill generates percolate.And there is biggish stench Taste attracts mosquito, pollutes environment.
There is no special deodorization process when municipal sewage treatment, the sludge generated in sewage disposal process is with smelly Taste, this is because such as bacterium, protozoan and algae microorganism are contained in sludge, by long-term procreation so that sludge It fouls.Nowadays the deodorization mode generallyd use is sludge mesophilic anaerobic digestion technique (at a kind of sludge of such as CN104163553A Reason method), however the metabolic conversion time of microorganism is long, the methane and carbon dioxide tolerance of generation is few, is unfavorable for quickly handling Sludge.
In addition to this, the moisture content of municipal sludge is up to 80% or more, after untreated sludge directly fills, landfill yard Earth's surface will 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 processing is difficult by resource utilization, because water content is too high, as long as generating transport, means greatly to transport Cost (water content 80% or so) on moisture content.And be sposh, it is created great difficulties to transport.One of maximum of sludge Utilization orientation be power generation by waste combustion, and the moisture percentage in sewage sludge not handled is too high, to waste very big thermal energy in evaporation water.
The processing operating cost of sludge is high.Currently, traditional method is improved by dosing coagulant, flocculation aid, Then mechanical dehydration is handled, and is formed the walk outward transport that moisture content is 80% or so and is carried 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 influence or ability need to be further dried Into incinerator processing and the system fertilizer that ferments.However the moisture percentage in sewage sludge after mechanical dehydration is very high the reason is that biological in sludge Cell and colloid, which contain a large amount of " Interstitial Water ", all to be squeezed out by the pressure that tradition machinery is dehydrated, while moisture percentage in sewage sludge It is in mucilage shape at 80% or so, hydrone is wrapped up by one layer of colloid, this region is referred to as " the viscose glue phase region " of sludge, is dirty Mud is dehydrated the stage being most difficult to, and is difficult further to remove with the method for traditional mechanical dehydration.So, it is necessary to it is special to take Means crack intercellular structure and sludge " viscose glue phase region ", so that part " Interstitial Water " is discharged, then pass through mechanism filter-pressing Mode filters out.Existing wall breaking technology generally has the technology of high temperature drying technique, machinery and ultrasonic wave, Strong oxdiative medicament broken wall skill Art.High temperature drying technique generates the harmful exhausts such as dioxin in sludge handling process, generates secondary pollution to environment.With machinery Breaking-wall cell is carried out with the technology of ultrasonic wave, other than equipment investment is larger, when operation also needs to consume a large amount of electric power.So Operating cost is big.Sludge cell wall breakage method is carried out using Strong oxdiative medicament, since the sludge concentration of 80% moisture content is high, medicament It is difficult sufficiently to be merged, additive amount is big, and cost is also high.It, may subsequent processing band to sludge because after joined chemical agent Unfavorable factor is carried out.
Therefore, sludge removes when it is urgent to provide a kind of processing methods of new municipal sewage to solve existing municipal sewage treatment The smelly time is long, the difficult technical problem of dehydration decrement.
Summary of the invention
Technical problem to be solved by the present invention lies in, a kind of city sewage deep treatment method is provided, it is dirty after processing The moisture content of mud substantially reduces, and drying and dehydrating speed is fast.
The technical problems to be solved by the invention also reside in, and provide a kind of city sewage deep treatment method, can effectively remove Smelly sterilization, sludge do not attract mosquito.
The technical problems to be solved by the invention also reside in, and provide a kind of city sewage deep treatment method, processed Sewage can reach national sewage discharge level-one A standard.
In order to solve the above-mentioned technical problems, the present invention provides a kind of city sewage deep treatment methods, including following step It is rapid:
Step 1: sewage is cleaned by grid, sand setting, primary deposition, biological treatment and secondary precipitation are so that sewage With sludge initial gross separation;
Step 2: sewage will be handled using the method for physics, chemistry or biology through step 1 treated sewage, disinfection is killed Reach discharge index discharge after bacterium;
Step 3: physical wall breaking will be carried out using grinding through step 1 treated sludge, then passes through chemical reagent progress Chemical broken wall deodorization, last filter-press dehydration, the sludge discharge after filters pressing, the water after recycling filters pressing are handled with step 2 again.
As the optimal technical scheme of the city sewage deep treatment method, the step 3 specifically includes following step It is rapid:
A. the mud being collected into is sent into collecting pit, then the biggish particle of partial size in mud is removed by vibrating screen;
B. the mud after vibrating shaker is sent into stirring stock tank, and quantitative slurry is pumped by mud and is put into grinder It is ground, broken wall;
C. the mud after grinding is sent into reaction tank, chloracid salt is first added, add sulfur-containing compound, chloride containing closes Object or polymeric oxides remove the stink in mud, finally using in weak base and mud;
D. flocculating setting agent is added in mud assembles the mud granule in mud;
E. mud after settlement is dehydrated the dirt after filters pressing so that the moisture content of sludge is down to 25-60% by filter press Mud discharge, the water after recycling filters pressing are handled with step 2 again.
As the optimal technical scheme of the city sewage deep treatment method, the chloracid salt in the step c is chlorine One of sour sodium, sodium chlorite and sodium hypochlorite or combination.
As the optimal technical scheme of the city sewage deep treatment method, sulfur-containing compound described in the step c For sodium pyrosulfate, one of sodium peroxydisulfate, aluminum sulfate, ferric sulfate, polyaluminium sulfate, bodied ferric sulfate, polymeric aluminum sulfate iron Or combination.
As the optimal technical scheme of the city sewage deep treatment method, chlorine-containing compound described in the step c For one of aluminium chloride, iron chloride, sodium chloride, aluminium polychloride, poly-ferric chloride, polyaluminum ferric chloride or combination.
As the optimal technical scheme of the city sewage deep treatment method, polymeric oxides described in the step c For one of polymer alumina, polymerization oxidation iron, polymerization oxidation ferro-aluminum or combination.
As the optimal technical scheme of the city sewage deep treatment method, the chloracid salt, contains sulfur-containing compound The additional amount of chlorine compound or polymeric oxides is the 0.001-0.5% that collecting pit collects sludge weight.
As the optimal technical scheme of the city sewage deep treatment method, the vibrating screen mesh mesh number is 10-60 Mesh.
As the optimal technical scheme of the city sewage deep treatment method, the grinder includes ball mill, is crushed Machine and sand mill.
The implementation of the embodiments of the present invention has the following beneficial effects:
City sewage deep treatment method of the present invention improves existing mud discharging processing method, using physical grinding broken wall It is combined with chemical deodorizing broken wall, reduces sludge returning, realized the broken wall of coated structure, pass through chemical reagent and broken wall Sludge afterwards comes into full contact with, and deodorizing effect is significant, and then filter-press dehydration makes the moisture content of sludge be down to 25-60%, after processing Sludge is faster than drying and dehydrating speed before processing.And it can reach through treated the sewage detection discovery of sewage discharge processing module National sewage discharge level-one A standard.
The workflow simple possible of entire sewage disposal system, without hot conditions and expensive large-scale instrument, operation It is at low cost;Also it is generated without new pollutant, avoids secondary pollution;It is environmentally protective, securely and reliably.And handle after sludge without Smelly, moisture content is low, greatly reduces the volume of sludge, saves sludge freight and processing landfill land used.
Detailed description of the invention
Fig. 1 is existing urban sewage treatment system process flow chart;
Fig. 2 is a kind of process flow chart of city sewage deep treatment method of the present invention;
Fig. 3 is a kind of another process flow chart of city sewage deep treatment method of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing Step ground detailed description.
City sewage deep treatment method of the present invention is on the basis of existing sewage water treatment method, for the prior art Sludge deodorization, bactericidal effect are poor, and the high disadvantage of moisture percentage in sewage sludge improves method for sludge treatment.
As shown in Fig. 2, the present invention provides a kind of city sewage deep treatment method, comprising the following steps:
S100 cleans sewage by grid, sand setting, primary deposition, biological treatment and secondary precipitation so that sewage with Sludge initial gross separation.
Grid removal of impurities: in sewage treatment facility entrance, it is necessary to grid is set, mainly using physical treatment process retention compared with Big floating material or suspended matter enables to run well to mitigate the load of subsequent processing structures.
Sediment by aeration: this process is generally located in grid removal of impurities below, it is therefore an objective to remove the biggish inorganic particle of specific gravity.
Primary deposition: primary sedimentation tank has preferable removal effect to inorganic matter, is generally located in front of biological treatment structures.
Bio-aeration: will be in the organic pollutant turn of dissolubility, colloidal state in sewage using the metabolism of microorganism Innocuous substance is turned to, to reach the requirement of discharge.
Secondary precipitation: the major function of secondary precipitation be in removal biological treatment process caused by, deposited with sludge form Biological cast or dead organism.
It all will appear what particle in water settled in above-mentioned process flow during sediment by aeration, primary deposition and secondary precipitation Process realizes the purpose that sewage is separated with sludge to form sludge in bottom of pond.The discharge being had nothing in common with each other due to sewage and sludge Standard and processing method, therefore sewage and sludge are separately handled below by S101 and S102 step.
Sewage after S100 step process is handled sewage using the method for physics, chemistry or biology by S101, and disinfection is killed Reach discharge index discharge after bacterium.
The method that the sewage through separating uses physics, chemistry or biology is handled to reach row in the S101 step Put index.Detection discovery, sewage processed by the invention can reach national sewage discharge level-one A standard (GB 18918-2002), Disposed of in its entirety cost is 1/5th or so of conventional desliming cost of sewage disposal.
Sludge after S100 step process is carried out physical wall breaking using grinding, then is carried out by chemical reagent by S102 Chemical broken wall deodorization, last filter-press dehydration, the sludge discharge after filters pressing, the water after recycling filters pressing use S101 step process again.
Existing urban sewage treatment system generally for precipitating collect obtained sludge directly adopt sedimentation, gas floatation process or Centrifugal process is to reduce moisture percentage in sewage sludge and reduce sludge volume, then is carried out dehydrating, and the moisture content of sludge is when finally discharging 80%, deodorization process is digested under aerobic or anaerobic condition, and volatile content in sludge is made to be reduced to solid sludges phase Not perishable over the ground and do not stink of, such deodorization process digestion period is long, and deodorizing effect is bad, is unfavorable for quickly handling dirty Mud.
Researcher has found that the main reason for sludge moisture content after mechanical dehydration is high is because of biological cells in sludge and glue Body, which contains a large amount of " Interstitial Water ", all to be squeezed out by the pressure that tradition machinery is dehydrated, while moisture percentage in sewage sludge is 80% It is in mucilage shape when left and right, hydrone is wrapped up by one layer of colloid, and it is sludge dewatering that this region, which is referred to as " the viscose glue phase region " of sludge, The stage being most difficult to is difficult further to remove with the method for traditional mechanical dehydration.
For this purpose, the present inventor is obtained in detail below by cleverly design process flow and repetition test day and night Technical thought:
The sludge that Treatment of Sludge is collected in the present invention is mud, and the moisture content of mud reaches 80-98%, at this time due to Moisture content is high, and the good fluidity of mud, mud granule may be homogenously dispersed in water.And the biggish particle of partial size is screened through vibrating screen After remove, filtered mud is put into grinder and is ground, on the one hand, can reduce the partial size of particle in mud;Another party Face, the better mud of mobility is easier to realize under the high frequency grinding of grinder breaks the above-mentioned packet formed by mud granule and water Wrap up in type structure, allow hydrone can separate out, be separated from mud granule.What the deodorization reagent that the later period is added was manufactured from broken wall Wound comes into full contact with mud granule, the significant effect of deodorizing sterilizing.It is dehydrated finally by conventional filter-pressing process, sludge is at this time Moisture content down to 25-60%, far below the moisture content of sludge 80% or so after the processing of existing sludge treatment technique.
It should be noted that the grinder includes the ball millings such as ball mill, crusher, sand mill and crushing plant, depending on The specific character of sludge carries out corresponding selection.
As shown in Fig. 2, the preferred embodiment of city sewage deep treatment method of the present invention, comprising the following steps:
S200 cleans sewage by grid, sand setting, primary deposition, biological treatment and secondary precipitation so that sewage with Sludge initial gross separation.
Sewage after S200 step process is handled sewage using the method for physics, chemistry or biology by S201, and disinfection is killed Reach discharge index discharge after bacterium.
The mud being collected into is sent into collecting pit by S202, then removes the biggish particle of partial size in mud by vibrating screen.
Present invention sludge source to be dealt with is the sludge that each sedimentation basin bottom of pond is collected in sewage disposal process, has and contains The features such as water rate is high, and microorganism is more, and taste is smelly, processing cost height and difficult dehydration.The mud decrement effect difference of the prior art be because Traditional wall breaking technology is difficult to destroy the coated structure of sludge, therefore Direct Dehydration is difficult.The present invention does not carry out directly but dense Contracting dehydration, makes mud moisture content be retained in 80-98%(depending on the sludge character of different regions), the good fluidity of mud, dirty at this time Mud particle can be well dispersed in water, so as to the grinding of next step mud.
Mud after vibrating shaker is sent into stirring stock tank by S203, and pumps quantitative slurry investment grinding by mud It is ground in machine, broken wall.
There is also the biggish particle of some partial sizes in mud, the large-size particle such as investment grinder, which can seriously affect, to be ground The step for grinding effect, therefore being arranged is for removing the biggish particle of partial size in mud, specifically, according to the property of different sludge The vibrating screen mesh mesh number within the scope of 10-60 mesh may be selected in shape.
The biggish particle of the partial size screened out is sent to slag bath, and filtered mud is then sent to stirring stock tank, in lasting stirring Under, the solid particle of mud can suspend in water, avoid the occurrence of lamination.
It will be ground in mud investment grinder, broken wall, on the one hand, the partial size of particle in mud can be reduced;Another party Face, the better mud of mobility is easier to realize under the high frequency grinding of grinder breaks the above-mentioned packet formed by mud granule and water Wrap up in type structure, allow hydrone can separate out, be separated from mud granule.Using broken wall mode of the invention, shell-broken effect More preferably, the dehydration rate of sludge is higher.
Mud after grinding is sent into reaction tank by S204, and chloracid salt is first added, and adds sulfur-containing compound, containing chlorine Compound or polymeric oxides remove the stink in mud, finally using in weak base and mud.
The mud being sent into reaction tank is since by grinding broken wall, the chemical reagent put into reaction tank can pass through the package Wound in type structure comes into full contact with internal microorganism, deodorization, sterilization.The wherein chemical reagent release sequence of reaction tank Are as follows: 1, chloracid salt;2, sulfur-containing compound, chlorine-containing compound or polymeric oxides;3, weak base.Chloracid salt has deodorizing sterilizing concurrently Effect, and reaction speed is especially fast, additional amount is few;Sulfur-containing compound and chlorine-containing compound are common deodorization reagent, and are polymerize The deodorizing effect of chloride is obvious.According to the sludge of different sewage treatment plant, ingredient performance is different, carries out different type and use The collocation of amount.It is eventually adding in a small amount of weak base and mud, while helping to be dehydrated.
Preferably, chloracid salt is one of sodium chlorate, sodium chlorite and sodium hypochlorite or combination.Sulfur-containing compound is Sodium pyrosulfate, one of sodium peroxydisulfate, aluminum sulfate, ferric sulfate, polyaluminium sulfate, bodied ferric sulfate, polymeric aluminum sulfate iron or Combination.Chlorine-containing compound is aluminium chloride, in iron chloride, sodium chloride, aluminium polychloride, poly-ferric chloride, polyaluminum ferric chloride A kind of or combination.Polymeric oxides are one of polymer alumina, polymerization oxidation iron, polymerization oxidation ferro-aluminum or combination.More than For the type and dosage that various chemical reagent are selected depending on sludge character, additional amount is generally the 0.001- of collecting pit sludge weight 0.5%.Since the above chemical agent is all that sludge is being added after physical wall breaking, situation that can be seldom in additional amount Under play the role of good deodorizing sterilizing.
Treated, and sludge ammonia level can be reduced to original 20% hereinafter, hydrogen sulfide gas is substantially zeroed through detecting, It is generated simultaneously without new pollutant, avoids causing secondary pollution to environment.
S205, flocculating setting agent, which is added, in mud assembles the mud granule in mud.
The flocculating setting agent that the present invention uses mainly has Flokal B and cationic flocculant, depending on different sewage processing The Sludge Property of factory, ingredient is different and selects suitable flocculant type and dosage.
Mud after settlement is dehydrated by filter press so that the moisture content of sludge is down to 25-60%, after filters pressing by S206 Sludge discharge, recycle filters pressing after water use S201 step process again.
Sludge is sent into filter press by diaphragm pump, enables sludge with most in short-term under the mechanical pressure that filter press provides Between, water in coated structure is discharged to greatest extent, the water of discharge flows into the raw processing pond of materialization of sewage discharge processing module, And sludge then discharges.The performance indicator comparison for the sludge that sludge and former processing method of the detection discovery after dehydration obtain is such as Under:
1, the moisture percentage in sewage sludge after processed by the invention is down to 25-60% from 80%;
2, at a temperature of 100 degree, take around 5 hours or more to dry raw sewage substantially, and treated sludge is 100 At a temperature of degree, it can dry completely within about 1.5 hours;
3, raw sewage is unable to naturally dry, sludge is under room temperature natural conditions after processing under room temperature natural conditions substantially (27 DEG C, cloudy) can dry dry for about 5 hours completely;
4, there is apparent maggot in raw sewage, largely attract mosquito, and foul smelling taste, treated, and sludge does not have maggot, Do not attract mosquito, and is destitute of smell substantially.
Dewatered sludge, can be used as fermentation system fertilizer, and conduct after flyash can also be added to make fuel in drying and dewatering Make the material of environmental protection brick, 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 the specific processing method of step S200 and S201 of the invention is same or similar, but due to existing The recycle-water that the sludge concentration tank of sewage water treatment method generates contains the impurity such as inorganic particle of more microorganism, 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 to pass through physical grinding, chemistry Sewage discharge processing module is convergeed to after deodorization again, greatly reduces processing pressure, and it is processed by the invention after sewage detection It was found that can reach national sewage discharge level-one A standard (GB 18918-2002), disposed of in its entirety cost is conventional desliming sewage treatment / 5th or so of cost.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention And range.

Claims (8)

1. a kind of city sewage deep treatment method, which comprises the following steps:
Step 1: sewage is cleaned by grid, sand setting, primary deposition, and biological treatment and secondary precipitation are so that sewage and dirt Mud initial gross separation;
Step 2: sewage will be handled using the method for physics, chemistry or biology through step 1 treated sewage, after disinfection and sterilization Reach discharge index discharge;
Step 3: will carry out physical wall breaking using grinding through step 1 treated sludge, then be carried out by chemical reagent chemical Broken wall deodorization, last filter-press dehydration, the sludge discharge after filters pressing, the water after recycling filters pressing are handled with step 2 again;
The step 3 specifically includes the following steps:
A. the mud being collected into is sent into collecting pit, then the biggish particle of partial size in mud is removed by vibrating screen;
B. the mud after vibrating shaker is sent into stirring stock tank, and is pumped in quantitative slurry investment grinder and is carried out by mud Grinding, broken wall;
C. by after grinding mud be sent into reaction tank in, first be added chloracid salt, add sulfur-containing compound, chlorine-containing compound or Polymeric oxides remove the stink in mud, finally using in weak base and mud;
D. flocculating setting agent is added in mud assembles the mud granule in mud;
E. mud after settlement is dehydrated by filter press so that the moisture content of sludge is down to 25-60%, the sludge after filters pressing Discharge, the water after recycling filters pressing are handled with step 2 again.
2. city sewage deep treatment method as described in claim 1, which is characterized in that the chloracid salt in the step c is One of sodium chlorate, sodium chlorite and sodium hypochlorite or combination.
3. city sewage deep treatment method as described in claim 1, which is characterized in that sulfur-bearing chemical combination described in the step c Object is sodium pyrosulfate, sodium peroxydisulfate, aluminum sulfate, ferric sulfate, polyaluminium sulfate, bodied ferric sulfate, one in polymeric aluminum sulfate iron Kind or combination.
4. city sewage deep treatment method as described in claim 1, which is characterized in that chloride containing described in the step c closes Object is one of aluminium chloride, iron chloride, sodium chloride, aluminium polychloride, poly-ferric chloride, polyaluminum ferric chloride or combination.
5. city sewage deep treatment method as described in claim 1, which is characterized in that polymerization oxidation described in the step c Object is one of polymer alumina, polymerization oxidation iron, polymerization oxidation ferro-aluminum or combination.
6. city sewage deep treatment method as described in claim 1, which is characterized in that the chloracid salt, sulfur-containing compound, The additional amount of chlorine-containing compound or polymeric oxides is the 0.001-0.5% that collecting pit collects sludge weight.
7. city sewage deep treatment method as described in claim 1, which is characterized in that the vibrating screen mesh mesh number is 10- 60 mesh.
8. city sewage deep treatment method as described in claim 1, which is characterized in that the grinder includes ball mill, breaks Broken machine and sand mill.
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CN1490262A (en) * 2003-06-11 2004-04-21 贤 金 Process for printing and dyeing waste water treating tower
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EP0764613A2 (en) * 1995-09-22 1997-03-26 Friedrich Teufert Process and plant for purification of municipal and domestic waste water
CN1490262A (en) * 2003-06-11 2004-04-21 贤 金 Process for printing and dyeing waste water treating tower
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CN204434432U (en) * 2015-01-28 2015-07-01 重庆秋之耘环保科技有限公司 A kind of sludge conditioning broken wall reaction unit

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