CN105621603B - Sewage biological treatment system returned sludge eluriates technique - Google Patents

Sewage biological treatment system returned sludge eluriates technique Download PDF

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Publication number
CN105621603B
CN105621603B CN201610004244.6A CN201610004244A CN105621603B CN 105621603 B CN105621603 B CN 105621603B CN 201610004244 A CN201610004244 A CN 201610004244A CN 105621603 B CN105621603 B CN 105621603B
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sludge
returned sludge
hydrocyclone
returned
activation
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CN105621603A (en
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莫建炎
江瑞原
王占国
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AOBANG ENVIRONMENTAL PROTECTION INDUSTRY Co Ltd CHANGSHA
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AOBANG ENVIRONMENTAL PROTECTION INDUSTRY Co Ltd CHANGSHA
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    • 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
    • C02F3/02Aerobic processes
    • C02F3/12Activated sludge processes
    • C02F3/1205Particular type of activated sludge processes
    • C02F3/1215Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

Sewage biological treatment system returned sludge eluriates technique.The mud mixture in secondary settling tank is delivered to hydrocyclone by sludge reflux pump;Under the power effect of the sludge reflux pump, the impurity such as hydrocyclone graininess larger to returned sludge Midst density detach, and the smaller mud mixture of the density after separation enters screen by the overflow port of hydrocyclone upper end;The substances such as screen paper scrap, plant fiber and the hair larger to the particle in mud mixture detach, and the returned sludge after Screening Treatment enters sludge activation pond and carries out aeration activation process;Returned sludge after activation process enters in aeration tank, and the active microorganism group in returned sludge increases, and improves the sludge loading in aeration tank, so as to improve sewage treating efficiency.Entire elutriation process only needs sludge reflux pump disposably to be promoted, and simplifies the facility needed for technique, can reduce energy consumption and operating cost.

Description

Sewage biological treatment system returned sludge eluriates technique
Technical field
The present invention relates to town sewage treatment system, returned sludge specifically in town sewage active sludge processing system Eluriate activating process.
Background technology
In town sewage treatment system, sewage generally after preposition setting pot, primary sedimentation tank processing, into hydrolysis acidification or Anaerobic Treatment carries out Aerobic biological process, Aerobic biological process mainly active sludge and biomembrane subsequently into aeration tank Method, sewage enter secondary settling tank after the Aerobic biological process of aeration tank, realize muddy water separation of solid and liquid, after separation of solid and liquid, sewage reaches Mark discharge carries out advanced treating, and sludge then enters corresponding subsequent processing process.
Activated sludge in activated sludge process aeration tank mainly includes four parts:1. the active microorganism with metabolic function Group, 2. microorganism endogenous respiration, autoxidation residue, the microorganism that 3. raw sewage contains is difficult to the organic matter degraded, 4. the inorganic matter that raw sewage contains;Being decomposed in aeration tank in the mainly activated sludge of the dirty Organic substance in water of oxidation has metabolism work( The active microorganism group of energy.In the aeration tank of activated sludge process, MLSS is normally controlled in the range of 2000~4000mg/L, 30~50% active microorganism groups are generally contained only in activated sludge;In activated sludge process operational process, because of activated sludge The density contrast of middle inorganic matter and organic matter, with the extension of run time, the active microorganism group in the activated sludge of aeration tank Content can continuously decrease, and inorganic constituents is then stepped up, and the reduction of active microorganism group will influence sewage in aeration tank Treatment effeciency in the range of certain activated sludge solids gross mass (MLSS), certainly will cause sludge loading to reduce, sewage disposal Efficiency reduces, and under set treatment scale, treatment effect is deteriorated, and under set treatment effect, then treatment scale drops It is low.Therefore, by improving the content of the active microorganism group in aeration tank, then sewage can be effectively improved in aeration tank Treatment effect.
By the reflux of the partial sludge of secondary settling tank in aeration tank, being the active microorganism group content that improves in aeration tank A kind of mode.Existing sludge reflux mode is that sludge a certain amount of in secondary settling tank is pumped directly into aeration with sludge reflux pump Pond, due in the mud mixture of secondary settling tank contain organic/inorganic substance, including the density that setting pot and primary sedimentation tank cannot remove compared with Big fine particle silt, the smaller paper scrap of density, plant fiber and hair etc., the sludge containing these inorganic matters is directly returned It flow in aeration tank, the accumulation of inorganic matter ingredient in aeration tank can be aggravated and increases, lead to the micro- life of activity with metabolic function The content of object group further reduces, so as to more influence treatment effect of the sewage in aeration tank.
Invention content
In view of the deficiencies of the prior art, the present invention proposes that a kind of sewage biological treatment system returned sludge eluriates technique, this Technique carries out the sludge to be flowed back by secondary settling tank elutriation processing, the larger graininess silt of removal returned sludge Midst density, density The substances such as smaller paper scrap, plant fiber and hair, improve returned sludge in active microorganism group content, and to elutriation after Sludge carry out activation process again, be then refluxed in aeration tank, so as to improve the active microorganism in aeration tank in activated sludge Group's ingredient realizes the purpose of the sludge loading for improving aeration tank and sewage treating efficiency.
This sewage biological treatment system returned sludge eluriates the step of technique, referring to Fig. 1:
A, the mud mixture in sewage biological treatment system in secondary settling tank is delivered to hydraulic cyclone by sludge reflux pump Separator;
B, under the effect of the power of the sludge reflux pump, hydrocyclone larger to returned sludge Midst density The impurity such as granular silt are detached, the sundries such as graininess silt after separation by hydrocyclone lower part underflow opening Discharge, the mud mixture containing substances such as the smaller paper scrap of density, plant fiber and hairs after separation is by hydraulic cyclone point Overflow port from device upper end enters screen;
C, the screen carries out the mud mixture of entrance Screening Treatment, it is smaller to the density in mud mixture and The substances such as the larger paper scrap of particle, plant fiber and hair are detached, paper scrap, plant fiber and hair after screening separation etc. Substance is discharged by slag notch, and the returned sludge after Screening Treatment enters sludge activation pond;
D, returned sludge carries out aeration activation process in sludge activation pond;
E, the returned sludge after activation process enters in the aeration tank in sewage biological treatment system, the work in returned sludge Property micropopulation participate in oxygenolysis and enter organic pollution in aeration tank in sewage.Because of active microorganism group in sludge Increase, improve the sludge loading in aeration tank, so as to improve sewage treating efficiency.
The present invention has following technique effect:
1st, present invention process is according to the existing forms of inorganic constituents in returned sludge, successively through hydrocyclone and filter Sieve carries out elutriation separating treatment, successively removes the big inorganic particulate matter of density and the small substance of density, effectively improves returned sludge Middle active microorganism group content, active microorganism group content can improve 15-20% in returned sludge.
2nd, to eluriating treated sludge, then carry out activation process by hydrocyclone and screen separation, make dirt Active microorganism group in mud is in the endogenous respiration phase, after aeration tank is back to, is typically in micro- life of endogenous respiration phase Object group adsorption capacity is strong, and it is that micropopulation decomposes the first step for aoxidizing dirty Organic substance in water to adsorb, therefore, after activated Micropopulation can significantly improve its absorption and oxidation susceptibility to dirty Organic substance in water, so as to improve at the sewage of aeration tank Manage effect.Using the returned sludge after elutriation and activation, the removal rate of dirty organic pollutants can improve 15 in aeration tank ~20%.
3rd, since the hydrocyclone in this technique is set to the front end of system, the power that sludge reflux pump is provided The work operation of hydrocyclone can not only be met, and the sludge of the smaller inorganic matter containing density after separation can be mixed Object is sent into screen, and without in addition setting delivery pump during sludge enters screen, entire elutriation process only needs sludge to return Stream pump is disposable to be promoted, and is simplified the facility needed for technique, can be reduced energy consumption and operating cost.
4th, since returned sludge makes the increase of active microorganism group content in activated sludge in aeration tank, in aeration tank dirt After sewage sludge mixture carries out precipitation separation into subsequent secondary settling tank so that content of organics increases therewith in sludge in secondary settling tank Add, be then conducive to follow-up excess sludge Anaerobic Digestion process steady and continuous operation, and increase the yield of anaerobic digestion biogas.
Description of the drawings
Fig. 1 is present invention process flow chart, and as Figure of abstract;
Fig. 2 is the related device structure diagram for realizing this technique.
Specific embodiment
The mud mixture in secondary settling tank in sewage biological treatment system 3 is delivered to hydraulic cyclone by sludge reflux pump 1 Separator 5;The entrance of sludge reflux pump 1 is connected by the first dredging tube 2 with the sludge blanket of 3 lower part of secondary settling tank, sludge reflux pump 1 The outlet inlet communication that passes through the second dredging tube 4 and hydrocyclone 5.
Under the power effect of the sludge reflux pump 1, returned sludge is from the tangential admission on hydrocyclone top Pipe enters in the hydrocyclone, and high speed rotation flow field is generated in cylindrical cavity, and hydrocyclone 5 is i.e. to reflux The sundries such as the larger fine particle silt of sludge Midst density are detached, so as to fulfill the separation of particles of inorganic material, after separation The sundries such as particles of inorganic material shape discharged by the underflow opening of hydrocyclone lower part, it is smaller containing density after separation The mud mixtures such as paper scrap, plant fiber and hair continue under the power effect of sludge reflux pump 1, by hydrocyclone separation technology The overflow port of device upper end enters screen 7;The overflow port of 5 upper end of hydrocyclone by third dredging tube 6 and screen 7 into Mouth communicates, referring to Fig. 2, by sludge sundries such as the particles of inorganic material shapes of hydrocyclone lower part underflow opening discharge by addition setting The facility put is handled.Without another during returned sludge enters screen 7 by 5 upper end overflow port of hydrocyclone Outer setting delivery pump, entire elutriation process only need sludge reflux pump disposably to be promoted, simplify the facility needed for technique, can subtract Few energy consumption and operating cost.
Screen 7 carries out Screening Treatment to the mud mixture of entrance, and the paper scrap larger to the particle in mud mixture is planted The substances such as fibres and hair are detached, the substances such as larger paper scrap, plant fiber and hair of particle after screening separation by Slag notch is discharged, and the returned sludge after Screening Treatment is entered by the 4th dredging tube 8 in sludge activation pond 9;Screen 7 contains storage mud Slot 7a after the sludge after Screening Treatment falls into storage mud groove 7a, enters sludge activation pond 9 by the 4th dredging tube 8;The filter Sieve 7 preferred rotating cylinder sieves;By substances such as the particle of 7 slag notch of screen exclusion larger paper scrap, plant fiber and hairs separately Processing.
After hydrocyclone and screen carry out elutriation separating treatment, the active microorganism group in returned sludge contains Amount can improve 15-20%.
Returned sludge, which enters, carries out aeration activation process in sludge activation pond 9, the microorganism in sludge is made to be in endogenous and is exhaled The suction phase, the microorganism adsorption ability in the endogenous respiration phase is strong, and aeration intensity is controlled by oxidation-reduction potential (ORP), Aeration tube 9a, aeration tube 9a is set to be supplied by compressed air source unit in sludge activation pond;It is aerated in activating tank, is to active microorganism Group provide oxygen, because matrix (organic matter) concentration is very low in activating tank, micropopulation rely on endogenous metabolism, using itself The plasmic oxidation in the parts such as reserve substance, enzyme, to obtain nutriment, Ze Shi active microorganisms group is in " starvation " shape State.Sludge activation pond 9 is connected by the 5th dredging tube 10 with the aeration tank 11 in sewage biological treatment system.
Returned sludge after activation process enters the aeration tank 11 in sewage biological treatment system, the activity in returned sludge Micropopulation participation oxygenolysis enters the organic pollution in aeration tank in sewage.Because active microorganism group increases in sludge Add, improve the sludge loading in aeration tank, so as to improve sewage treating efficiency.Aeration component 11a in aeration tank 11 into During row aeration, the removal rate of the organic pollution in aeration tank in sewage can improve 15~20%.
This technique successively carries out elutriation processing to the sludge to be flowed back by secondary settling tank by hydrocyclone and screen, Activation process is carried out through sludge activation pond again, is then refluxed in aeration tank, the sludge loading in aeration tank and activity dirt can be improved Active microorganism group ingredient in mud, so as to improve the sewage treating efficiency in aeration tank, it can be achieved that existing sewage treatment plant Upgrading capacity expansion revamping meets one of increasingly strict technological approaches of wastewater treatment effluent quality requirement of country and newly-built dirt The optional method that water treatment plant reduces investment outlay.

Claims (3)

1. sewage biological treatment system returned sludge eluriates technique, it is characterized in that:
A, the mud mixture in sewage biological treatment system in secondary settling tank is delivered to hydrocyclone separation technology by sludge reflux pump Device;
B, under the effect of the power of the sludge reflux pump, the hydrocyclone graininess larger to returned sludge Midst density Silt impurity is detached, and the graininess silt sundries after separation is discharged by the underflow opening of hydrocyclone lower part, warp Mud mixture containing the smaller paper scrap of density, plant fiber and hair substance after separation is by hydrocyclone upper end Overflow port enters screen;
C, the screen carries out Screening Treatment, and particle smaller to the density in mud mixture to the mud mixture of entrance Larger paper scrap, plant fiber and hair substance is detached, and paper scrap, plant fiber and the hair substance after screening separation are by going out Cinder notch is discharged, and the returned sludge after Screening Treatment enters sludge activation pond;
D, returned sludge carries out aeration activation process in sludge activation pond;
E, the returned sludge after activation process enters in the aeration tank in sewage biological treatment system, and the activity in returned sludge is micro- Biocenose participation oxygenolysis enters the organic pollution in aeration tank in sewage.
2. sewage biological treatment system returned sludge described in accordance with the claim 1 eluriates technique, it is characterized in that:The sludge is lived Change and aeration tube is equipped in pond.
3. sewage biological treatment system returned sludge described in accordance with the claim 1 eluriates technique, it is characterized in that:The screen It is sieved for rotating cylinder.
CN201610004244.6A 2016-01-05 2016-01-05 Sewage biological treatment system returned sludge eluriates technique Active CN105621603B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107265757A (en) * 2017-06-12 2017-10-20 河北卓润环境科技有限公司 Method based on Strong oxdiative and circulation biochemical treatment medical intermediate production waste water
CN107200434A (en) * 2017-06-12 2017-09-26 河北卓润环境科技有限公司 Method based on multidimensional Strong oxdiative and circulation biochemical treatment electroplating wastewater
CN107235599A (en) * 2017-06-12 2017-10-10 河北卓润环境科技有限公司 The method that waste water is produced based on Strong oxdiative and the thin miscellaneous skin of multiple stage circulation biochemical treatment
CN107216001A (en) * 2017-06-12 2017-09-29 河北卓润环境科技有限公司 Method based on multidimensional Strong oxdiative and circulation biochemical treatment pulp black liquor middle-stage wastewater
CN107365012A (en) * 2017-06-12 2017-11-21 河北卓润环境科技有限公司 Method based on multidimensional Strong oxdiative and circulation biochemical treatment refuse leachate
CN107216002A (en) * 2017-06-12 2017-09-29 河北卓润环境科技有限公司 The method that waste water is produced based on multidimensional Strong oxdiative and circulation biochemical treatment coal chemical industry
CN107381931A (en) * 2017-06-12 2017-11-24 河北卓润环境科技有限公司 Method based on Strong oxdiative and circulation biochemical treatment dyestuff intermediate production waste water

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1359859A (en) * 2001-10-27 2002-07-24 江苏宜净环保有限公司 Improved process for primary treatment of sewage in urban area
JP2004041981A (en) * 2002-07-15 2004-02-12 Mitsubishi Heavy Ind Ltd Organic waste water treatment method and its system
CN102241462A (en) * 2011-06-14 2011-11-16 重庆大学 Bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1359859A (en) * 2001-10-27 2002-07-24 江苏宜净环保有限公司 Improved process for primary treatment of sewage in urban area
JP2004041981A (en) * 2002-07-15 2004-02-12 Mitsubishi Heavy Ind Ltd Organic waste water treatment method and its system
CN102241462A (en) * 2011-06-14 2011-11-16 重庆大学 Bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and method

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