CN102060423B - Method for acquiring denitrified carbon source by fermenting surplus sludge - Google Patents

Method for acquiring denitrified carbon source by fermenting surplus sludge Download PDF

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Publication number
CN102060423B
CN102060423B CN2010105610941A CN201010561094A CN102060423B CN 102060423 B CN102060423 B CN 102060423B CN 2010105610941 A CN2010105610941 A CN 2010105610941A CN 201010561094 A CN201010561094 A CN 201010561094A CN 102060423 B CN102060423 B CN 102060423B
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carbon source
excess sludge
fermentor tank
utilizing
fermentation
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CN102060423A (en
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韩洪军
胡宏博
马文成
王伟
王冰
李慧强
徐春燕
李雨霏
刘音颂
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing

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Abstract

The invention relates to a method for acquiring a denitrified carbon source, particularly a method for acquiring a denitrified carbon source by fermenting surplus sludge. The method comprises the following steps: 1. carrying out ultrasonic pretreatment on surplus sludge, and fermenting; and 2. aerating the supernatant generated after fermentation, and treating the supernatant by a guano process, wherein effluent water of a reaction tank is the denitrified carbon source acquired by fermenting surplus sludge. The raw material adopted by the method is waste in municipal sewage plants, and therefore, the invention achieves the purpose of changing waste into resources; sludge generated in the sewage plants is treated on the spot to produce a carbon source, thereby saving the transportation expenses; surplus sludge after fermentation is converted into harmless substances, the amount of the sludge is reduced, and the surplus sludge can be further composted or fermented to produce methane or can be landfilled, thereby facilitating the subsequent treatment and lowering the cost; when being used as a carbon source, the generated sludge supernatant has the advantages of high content of short chain fatty acids and high C/N ratio; and the effluent water of the reaction tank can be directly transmitted into a denitrification reaction tank and used as a carbon source.

Description

A kind of method of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source
Technical field
The present invention relates to a kind of method of obtaining the denitrification denitrogenation carbon source.
Background technology
Present widely used denitrification process generally adopts the process integration of nitration denitrification; Generally comprising space or time go up anaerobism, anoxic, aerobic three kinds of states alternately, through adjustment with optimize spatial and temporal distributions and the reflux type of array mode and the quantity thereof of three kinds of states, the purpose that the position reaches efficient denitrification.Wherein need a large amount of organism in the denitrogenation of denitrification section.Because the actual C/N of China's municipal effluent is lower, and keeps away at nitrated section and unavoidable will consume a part of carbon source, often in denitrification process, can not satisfy the needs of denitrifying bacterium, the deficiency of organic carbon source has had a strong impact on the sewage denitrification and dephosphorization effect.The municipal sewage plant solves the method that the insufficient method bag of carbon source generally adopts additional carbon at present.The additional carbon that adds has methyl alcohol and acetate etc.Though the methyl alcohol nitric efficiency is high, the toxicity of itself can cause potential dangerous to environment; Though the toxicity of ethanol and acetate does not have methyl alcohol strong, cost is higher.
And on the other hand, excess sludge is the solid waste that produces in the WWT, and how enormous amount deals carefully with these mud, has become the problem that countries in the world are paid close attention to.In recent years, development trend of sludge treatment is a recycling sludge.
Summary of the invention
The object of the invention provides a kind of method of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source.
The method of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source is carried out according to the following steps: the excess sludge that, municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 5～10min; Get into storage pool then; Being added in the fermentor tank, is that 20～30 ℃, pH value are anaerobically fermenting 5～7 days under 5.5～6.5 the condition in temperature again; Two, carry out aeration in the supernatant entering reaction tank that step 1 fermentation back produces, making dissolved oxygen concentration is 4～6mg/L, adopts the struvite method to handle then, and the reaction tank water outlet is the denitrification denitrogenation carbon source of utilizing the excess sludge fermentation to obtain; The ultrasonic power that wherein ultrasonic pretreatment adopts in the step 1 is 5KW; The mud dosage that is added in the step 1 in the fermentor tank accounts for 15%～20% of fermentor tank TV, and adds the employing intermittent type, adds once in per 2 days.
The raw material that the present invention adopts all is the refuse of municipal sewage plant, uses the present invention to have the purpose of changing waste into resources; And the mud on-the-spot disposal that produces in Sewage Plant, the production carbon source has been saved trucking costs; The remaining mud in fermentation back has also been accomplished innoxious and purpose minimizing, and further compost or fermentation methane production or landfill disposal are beneficial to subsequent disposal, and be with low cost; The mud supernatant that produces as carbon source short-chain fat acid content up to more than 90%; COD is 3000mg/L, and the C/N ratio is up to 14～16: 1, and sludge fermentation efficient 100～120mgSCFAsg-1VSS; It is thus clear that the reaction tank water outlet can be delivered directly in the anti-nitration reaction pond and use as carbon source.
The present invention adopts normal temperature fermentation, does not establish warming apparatus, and the insulation measure only is set, and outer wall is made thermal insulation layer with the heat-insulation and heat-preservation porous plastics, and is less demanding on the equipment, practices thrift cost, is more suitable for promoting the use of on a large scale.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the method that this embodiment utilizes the excess sludge fermentation to obtain the denitrification denitrogenation carbon source is carried out according to the following steps: the excess sludge that, municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 5～10min; Get into storage pool then; Being added in the fermentor tank, is that 20～30 ℃, pH value are anaerobically fermenting 5～7 days under 5.5～6.5 the condition in temperature again; Two, carry out aeration in the supernatant entering reaction tank that step 1 fermentation back produces, making dissolved oxygen concentration is 4～6mg/L, adopts the struvite method to handle then, and the reaction tank water outlet is the denitrification denitrogenation carbon source of utilizing the excess sludge fermentation to obtain; The ultrasonic power that wherein ultrasonic pretreatment adopts in the step 1 is 5KW; The mud dosage that is added in the step 1 in the fermentor tank accounts for 15%～20% of fermentor tank TV, and adds the employing intermittent type, adds once in per 2 days.
Excess sludge pumps into through sludge pump and carries out ultrasonic pretreatment in the ultrasonic device in this embodiment step 1; Ultrasonic device is that bulk/volume buying obtains.
Excess sludge carries out ultrasonic pretreatment in this embodiment step 1; Purpose is to make a considerable amount of microorganism walls fragmentations in the mud structure of matter; Tenuigenin and enzyme are released; Intracellular organic matter supplies microorganism growth as substrate, and the tenuigenin that is released out gets into biosystem as supplementary carbon source from the anaerobism section; And can improve biological degradation rate, reduce surplus sludge volume.
Be anaerobically fermenting in this embodiment step 1, so fermentation equipment need totally-enclosed.
Supernatant C/N ratio that this embodiment step 1 fermentation back produces is 8～12: 1, and the pH value is 5.5～6.5; Handling back pH value through aeration is 7～11, and this is because be dissolved with a large amount of CO in the supernatant 2, the method for use aeration can stripping CO 2, so that the pH value improves.
This embodiment adopts the struvite method to handle, and purpose is further to reduce nitrogen and phosphorus content in the supernatant, and advantage is in removing waste water in the ammonia nitrogen, resulting throw out MgNH 4PO 4Can be used as compound manure, thereby realize the comprehensive utilization of refuse, have tangible economic benefit; Principle is: through in waste water, adding magnesium salts and phosphoric acid salt, make Mg 2+, PO 4 3-With the NH in the waste water 4 +Chemical reaction takes place, and generates double salt MgNH 4PO 46H 2The O deposition, thereby with NH 4 +Remove; Its main chemical reactions is following:
Mg 2++NH 4 ++PO 4 3-+6H 2O→MgNH 4PO 4·6H 2O↓
Mg 2++NH 4 ++HPO 3 2-+6H 2O→MgNH 4PO 4·6H 2O↓+H +
Mg 2++NH 4 ++HPO 3 2-+6H 2O+OH -→MgNH 4PO 4·6H 2O↓+H 2O
The C/N ratio was 14～16: 1 after supernatant was handled through struvite in this embodiment, and COD is 3000mg/L; Its Short-Chain Fatty Acids content is more than 90%, and sludge fermentation efficient 100～120mgSCFAsg-1VSS is it is thus clear that the reaction tank water outlet can be delivered directly in the anti-nitration reaction pond and use as carbon source.
Embodiment two: what this embodiment and embodiment one were different is that the excess sludge that in the step 1 municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 5min; Get into storage pool then; Being added in the fermentor tank, is that 20 ℃, pH value are anaerobically fermenting 7 days under 5.5 the condition in temperature again.Other step and parameter are identical with embodiment one.
Embodiment three: what this embodiment and embodiment one were different is that the excess sludge that in the step 1 municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 10min; Get into storage pool then; Being added in the fermentor tank, is that 30 ℃, pH value are anaerobically fermenting 5 days under 6.5 the condition in temperature again.Other step and parameter are identical with embodiment one.
Embodiment four: what this embodiment and embodiment one were different is that the excess sludge that in the step 1 municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 6～9min; Get into storage pool then; Being added in the fermentor tank, is that 22～28 ℃, pH value are anaerobically fermenting 5.5～6.5 days under 5.8～6.2 the condition in temperature again.Other step and parameter are identical with embodiment one.
Embodiment five: what this embodiment and embodiment one were different is that the excess sludge that in the step 1 municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 8min; Get into storage pool then; Being added in the fermentor tank, is that 25 ℃, pH value are anaerobically fermenting 6 days under 6 the condition in temperature again.Other step and parameter are identical with embodiment one.
Embodiment six: what this embodiment was different with one of embodiment one to five is that the mud dosage that is added in the step 1 in the fermentor tank accounts for 15% of fermentor tank TV.Other step and parameter are identical with one of embodiment one to five.
Embodiment seven: what this embodiment was different with one of embodiment one to five is that the mud dosage that is added in the step 1 in the fermentor tank accounts for 20% of fermentor tank TV.Its step and parameter are identical with one of embodiment one to five.
Embodiment eight: what this embodiment was different with one of embodiment one to five is that the mud dosage that is added in the step 1 in the fermentor tank accounts for 16%～19% of fermentor tank TV.Its step and parameter are identical with one of embodiment one to five.
Embodiment nine: what this embodiment was different with one of embodiment one to five is that the mud dosage that is added in the step 1 in the fermentor tank accounts for 18% of fermentor tank TV.Its step and parameter are identical with one of embodiment one to five.
Embodiment ten: this embodiment is different with one of embodiment one to nine is that to make dissolved oxygen concentration in the step 2 be 5mg/L.Its step and parameter are identical with one of embodiment one to six.
Embodiment 11: what this embodiment was different with one of embodiment one to ten is that aeration adopts single hole film aeration or perforated pipe aerating regulation mode in the step 2.Its step and parameter are identical with one of embodiment one to ten.
Embodiment 12: this embodiment is different with one of embodiment one to 11 is to adopt the struvite method to handle in the step 2, and used magnesium phosphorus amount ratio is that 1: 1, churning time are 20～30min.Its step and parameter are identical with one of embodiment one to 11.
Embodiment 13: the method that this embodiment utilizes the excess sludge fermentation to obtain the denitrification denitrogenation carbon source is carried out according to the following steps: the excess sludge that, municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 8min; Get into storage pool then; Being added in the fermentor tank, is that 25 ℃, pH value are anaerobically fermenting 6 days under 6 the condition in temperature again; Two, carry out aeration in the supernatant entering reaction tank that step 1 fermentation back produces, making dissolved oxygen concentration is 5mg/L, adopts the struvite method to handle then, and the reaction tank water outlet is the denitrification denitrogenation carbon source of utilizing the excess sludge fermentation to obtain; The ultrasonic power that wherein ultrasonic pretreatment adopts in the step 1 is 5KW; The mud dosage that is added in the step 1 in the fermentor tank accounts for 18% of fermentor tank TV, and adds the employing intermittent type, adds once in per 2 days.
The C/N ratio was 16: 1 after supernatant was handled through struvite in this embodiment, and COD is 3000mg/L; Its Short-Chain Fatty Acids content 95%, sludge fermentation efficient 120mgSCFAsg-1VSS, visible, the reaction tank water outlet can be delivered directly in the anti-nitration reaction pond and use as carbon source.

Claims (7)

1. method of utilizing excess sludge fermentation to obtain the denitrification denitrogenation carbon source; The method that it is characterized in that utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source is carried out according to the following steps: the excess sludge that, municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 5～10min; Get into storage pool then; Being added in the fermentor tank, is that 20～30 ℃, pH value are anaerobically fermenting 5～7 days under 5.5～6.5 the condition in temperature again; Two, carry out aeration in the supernatant entering reaction tank that step 1 fermentation back produces, making dissolved oxygen concentration is 4～6mg/L, adopts the struvite method to handle then, and the reaction tank water outlet is the denitrification denitrogenation carbon source of utilizing the excess sludge fermentation to obtain; The ultrasonic power that wherein ultrasonic pretreatment adopts in the step 1 is 5KW; The mud dosage that is added in the step 1 in the fermentor tank accounts for 15%～20% of fermentor tank TV, and adds the employing intermittent type, adds once in per 2 days; Wherein, adopt the struvite method to handle in the step 2, used magnesium phosphorus amount ratio is that 1: 1, churning time are 20～30min.
2. a kind of method of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source according to claim 1; It is characterized in that the excess sludge that in the step 1 municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 6～9min; Get into storage pool then; Being added in the fermentor tank, is that 22～28 ℃, pH value are anaerobically fermenting 5.5～6.5 days under 5.8～6.2 the condition in temperature again.
3. a kind of method of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source according to claim 1; It is characterized in that the excess sludge that in the step 1 municipal wastewater treatment plant is produced carries out ultrasonic pretreatment 8min; Get into storage pool then; Being added in the fermentor tank, is that 25 ℃, pH value are anaerobically fermenting 6 days under 6 the condition in temperature again.
4. according to claim 1,2 or 3 described a kind of methods of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source, the mud dosage that it is characterized in that being added in the step 1 in the fermentor tank accounts for 16%～19% of fermentor tank TV.
5. according to claim 1,2 or 3 described a kind of methods of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source, the mud dosage that it is characterized in that being added in the step 1 in the fermentor tank accounts for 18% of fermentor tank TV.
6. a kind of method of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source according to claim 5, it is characterized in that making in the step 2 dissolved oxygen concentration is 5mg/L.
7. a kind of method of utilizing the excess sludge fermentation to obtain the denitrification denitrogenation carbon source according to claim 6 is characterized in that aeration adopts single hole film aeration or perforated pipe aerating regulation mode in the step 2.
CN2010105610941A 2010-11-26 2010-11-26 Method for acquiring denitrified carbon source by fermenting surplus sludge Expired - Fee Related CN102060423B (en)

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CN102557373A (en) * 2011-08-01 2012-07-11 佛山市水业集团有限公司 Treatment method of excess sludge
CN103663681B (en) * 2013-12-15 2015-05-20 北京工业大学 Device and method for utilizing carbon source in sludge to treat urban sewage through in-depth nitrogen and phosphorus removal by SBR (sequencing batch reactor)
CN105541061A (en) * 2015-12-27 2016-05-04 桂林理工大学 Method for processing slurry with high energy ultrasonic waves
CN105567549B (en) * 2015-12-31 2018-02-23 北京科技大学 A kind of method for reducing ammonia nitrogen concentration in three stage fermentation system flowback biogas slurries
CN105502866B (en) * 2016-02-05 2018-10-09 无锡华光锅炉股份有限公司 A kind of method and system recycling guanite from sludge
CN106219872B (en) * 2016-08-12 2019-05-14 同济大学 The processing method and organic wastewater treating system of organic wastewater
CN106673193A (en) * 2016-11-21 2017-05-17 北京工业大学 Method for performing biological contact and oxidation treatment of low C/N sewage through anaerobic fermentation coupling A<2>/O
CN106477846B (en) * 2016-11-25 2020-02-18 太原理工大学 Method for strengthening microbial electrolysis sludge hydrogen production and recycling struvite by adopting free nitrite
CN108558162B (en) * 2018-04-12 2021-02-12 大连理工大学 Method for recycling residual sludge hydrothermal carbonization liquid
CN110395800B (en) * 2019-08-27 2020-08-04 江南大学 Preparation method and application of external carbon source for denitrification
CN112812280B (en) * 2020-12-31 2022-02-08 清华大学 Method for producing polyhydroxy fatty acid ester coupling denitrification

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JP3844347B2 (en) * 2002-11-18 2006-11-08 株式会社荏原製作所 Method and apparatus for removing and recovering phosphorus from organic wastewater
JP4516025B2 (en) * 2003-11-21 2010-08-04 荏原エンジニアリングサービス株式会社 Method and apparatus for producing / recovering magnesium ammonium phosphate
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CN101654238A (en) * 2009-09-11 2010-02-24 华东理工大学 Method for recovering phosphonium compound from phosphorous excess sludge of urban sewage treatment plant

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