CN110054287A - A method of passing through control mixed liquor characteristics decelerating membrane pollution in SNAD technique - Google Patents

A method of passing through control mixed liquor characteristics decelerating membrane pollution in SNAD technique Download PDF

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Publication number
CN110054287A
CN110054287A CN201910396596.4A CN201910396596A CN110054287A CN 110054287 A CN110054287 A CN 110054287A CN 201910396596 A CN201910396596 A CN 201910396596A CN 110054287 A CN110054287 A CN 110054287A
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China
Prior art keywords
mixed liquor
membrane
membrane pollution
sludge
passing
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Pending
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CN201910396596.4A
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Chinese (zh)
Inventor
刘广青
郭佳
苏本生
刘小锦
刘琪
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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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
    • C02F3/28Anaerobic digestion processes
    • C02F3/2853Anaerobic digestion processes using anaerobic membrane bioreactors
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/02Temperature
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/06Controlling or monitoring parameters in water treatment pH
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/08Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/22O2
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/14Maintenance of water treatment installations

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  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention discloses a kind of by the method for control mixed liquor characteristics decelerating membrane pollution in SNAD technique, by SNAD technique in conjunction with MBR, realizes decelerating membrane pollution by parameters such as SMP, EPS, viscosity, relative hydrophobicities in control sludge mixing.The present invention can reduce membrane fouling rate, the fouling membrane period was up to 100 days by adjusting the pollution factor in mixed liquor;The film being contaminated can restore the 95% of former membrane flux after clear water is washed.In addition, technological operation provided by the invention is simple, is conducive to significantly reduce operating cost, reduces energy consumption.

Description

A method of passing through control mixed liquor characteristics decelerating membrane pollution in SNAD technique
Technical field
The invention belongs to technical field of sewage, and in particular to one kind passes through control mixed liquor characteristics in SNAD technique The method of decelerating membrane pollution.
Background technique
Membrane bioreactor (membrane bioreactor, MBR) has micro-organism treatment process and membrane separation technique The characteristics of efficient process is reached to waste water is combined, good, sludge produces more traditional biological treatment with effluent quality Measure low advantage.Under micro-oxygen conditions, MBR is combined with SNAD technique, with occupied area, few, easily operated control etc. is excellent Point.But there is a problem of that maximum is fouling membrane for MBR operation stability and process economy.The cleaning and replacement nothing of membrane module Doubting will increase operating cost, and the research to cause of membrane fouling and its influence factor is so that find suitable service condition, this is to mentioning It is significant to reduce operating cost for high film service efficiency.
Summary of the invention
Object of the present invention is under micro- oxygen MBR membrane bioreactor SNAD process conditions, use membrane aperture poly- for 0.3 μm Vinylidene hollow-fibre membrane (PVDF) component detects fouling membrane variation by TMP, passes through using film constant output flow as standard Fouling membrane factor in mud mixed liquid is controlled with decelerating membrane pollution rate:
A method of passing through control mixed liquor characteristics decelerating membrane pollution in SNAD technique, which is characterized in that by SNAD Technique realizes decelerating membrane pollution in conjunction with MBR, through SMP, EPS, viscosity, relative hydrophobicity parameter in control sludge mixing.Film The period is polluted up to 100 days;The film being contaminated can restore the 95% of former membrane flux after clear water is washed.
Further, membrane flux is 7.5L/ (m2H), the carbon source in using glucose as water inlet matrix, influent COD are 200mg/L, dissolved oxygen control is in 0.3-0.6mg/L in reactor, and pH value is in 7.8-8.1, and temperature is at 35 DEG C.
Further, sludge state has two kinds of existing ways of wadding body and particle, using the fortune of high sludge concentration and underload Line mode, sludge concentration 15.0-16.5g/L, by membrane module effect by sludge all retention in the reactor, sludge age without Limit for length, membrane module use interval water-out manners, and every water outlet 12min rests 3min.
Further, SMP concentration is in 4.5-7mg/L in mud mixed liquid, and EPS concentration is in 90-130mg/L, sludge mixing PN/PS range is 0.1-1.3 in SMP in liquid, and PN/PS range is 1.5-3 in EPS.Specifically, can be by protein and polysaccharide summation It is considered as SMP and EPS concentration.
Further, sewage sludge viscosity is 0.7-0.8mPa.s in mixed liquor.
Further, with the increase of membrane pollution resistance, PN/PS ratio increases in LB, mud mixed liquid relative hydrophobicity RH is controlled in 35%-60%.
Further, in mixed liquor Zeta potential in -13.2mV~-18.2mV.The increase of Zeta potential absolute value causes Sludge intermolecular electrostatic repulsion increases, therefore need to be controlled in a certain range.
The advantages of the present invention are mainly reflected in:
Under micro-oxygen conditions, SNAD technique is combined with MBR system, the shearing force that lesser aeration quantity generates is to film dirt Dye souring is weaker, by adjusting the pollution factor in mixed liquor, can reduce membrane fouling rate, effectively be controlled to fouling membrane System.It has been observed that all adhering to a large amount of pollutants in film surfaces externally and internally under scanning electron microscope sem;To each section fouling membrane contribution rate Analysis, film Rm itself is 4%, by pore plugging RPCaused fouling membrane accounts for 24%, as SMP it is main caused by gel layer pollute RbAccount for 37%, as EPS it is main caused by cake layer pollute RcAccount for 35%.In pollution early period, transmembrane pressure TMP is first in rapid increase Trend, it is then gentle, after polluting a period of time, and critical flux is rapidly increased to, completed a pollution period, totally 100 days. The rate of fouling membrane is respectively 0.5kpa/d, 0.18kpa/d, 0.64kpa/d in early, middle, late stage.In addition, provided by the invention Technological operation is simple, is conducive to significantly reduce operating cost, reduces energy consumption.
Detailed description of the invention
Fig. 1 is membrane module figure used in the present invention.
Fig. 2 is the forward and backward SEM scanning electron microscope (SEM) photograph of fouling membrane, wherein figure (a) is clean film wire surface, figure (b) is pollution caudacoria Silk outer surface, figure (c) are film wire inner surface after pollution, and figure (d) is film surface pollutant.
Specific embodiment
To make those skilled in the art more fully understand technical solution of the present invention, below with reference to embodiment to the present invention What is provided is described in detail in SNAD technique by the method for controlling mixed liquor characteristics decelerating membrane pollution.
SNAD technique is 7.5L/ (m in membrane flux in conjunction with MBR by this method2H) under the conditions of, in being mixed to sludge The parameters such as SMP, EPS, viscosity, relative hydrophobicity are controlled, and achieve the purpose that decelerating membrane pollution rate, and the fouling membrane period is reachable 100 days;The film being contaminated can restore the 95% of former membrane flux after clear water is washed.
It mainly comprises the steps that
(1) industrial low ratio of carbon to ammonium waste water (C/N=1), using glucose as carbon source, inlet COD concentration test water inlet: are simulated For 200mg/L, be subject to ammonium chloride, glucose, sodium bicarbonate, sodium dihydrogen phosphate, sodium chloride and using some microelements etc. as Water inlet matrix;
(2) method of operation: dissolved oxygen maintains 0.3-0.6mg/L in reactor, and pH is in 7.8-8.1 range, temperature 35 DEG C, using the method for operation of high sludge concentration and underload, sludge concentration 15.0-16.5g/L, sludge age endless.Using Interval film water-out manners, every water outlet 12min rest 3min.
(3) process is tested:
With the increase of reactor runing time, membrane pollution resistance is gradually increasing, and is remembered with protein and polysaccharide concentration summation For the concentration of SMP or EPS, by the control to sludge concentration, the concentration of SMP is 4.5mg/L-7.0mg/L, and the concentration of EPS is 90mg/L-130mg/L。
PN/PS represents the ratio between protein and polysaccharide concentration, with the increase of reactor runing time, in mud mixed liquid PN/PS increases in 1.3, EPS PN/PS by 0.1 and increases by 3 by 1.5 in SMP, PN/PS increase in either SMP or EPS, all It will increase fouling membrane, therefore by PN/PS control in lower range.
With the increase of running time, PN/PS ratio increases in LB, mud mixed liquid relative hydrophobicity RH control exists Within the scope of 35%-60%, Zeta potential is in -13.2mV~-18.2mV in mixed liquor.In SNAD, Anammox flora generation Long for the period, sludge concentration variation is slower, and sewage sludge viscosity is 0.7-0.8mPa.s or so in mixed liquor, and viscosity change is smaller.
It has been observed that all adhering to a large amount of pollutants in film surfaces externally and internally under scanning electron microscope sem.The contribution of each section fouling membrane Rate analysis, film R itselfmIt is 4%, by pore plugging RPCaused fouling membrane accounts for 24%, as SMP it is main caused by gel layer it is dirty Contaminate RbAccount for 37%, as EPS it is main caused by cake layer pollute RcAccount for 35%.
In pollution early period, transmembrane pressure TMP is first in rapid increase trend, then gentle, after polluting a period of time, and it is fast Speed rises to critical end point, completes a pollution period, totally 100 days.The rate of fouling membrane is respectively in early, middle, late stage 0.5kpa/d、0.18kpa/d、0.64kpa/d。
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from In the case where mind and essence, various types and improvement can be made, these variations and modifications are also considered as protection scope of the present invention.

Claims (7)

1. a kind of pass through the method for control mixed liquor characteristics decelerating membrane pollution in SNAD technique, which is characterized in that by SNAD work Skill realizes decelerating membrane pollution in conjunction with MBR, through SMP, EPS, viscosity, relative hydrophobicity parameter in control sludge mixing.
2. passing through the method for control mixed liquor characteristics decelerating membrane pollution, feature in SNAD technique according to claim 1 It is, membrane flux is 7.5L/ (m2H), the carbon source in using glucose as water inlet matrix, influent COD 200mg/L, reactor Middle dissolved oxygen control is in 0.3-0.6mg/L, and pH value is in 7.8-8.1, and temperature is at 35 DEG C.
3. passing through the method for control mixed liquor characteristics decelerating membrane pollution, feature in SNAD technique according to claim 2 It is, sludge state there are two kinds of existing ways of wadding body and particle, and using the method for operation of high sludge concentration and underload, sludge is dense Degree is 15.0-16.5g/L, and by membrane module effect, by sludge, all in the reactor, sludge age endless, membrane module is adopted for retention With interval water-out manners, every water outlet 12min rests 3min.
4. passing through the method for control mixed liquor characteristics decelerating membrane pollution, feature in SNAD technique according to claim 3 It is, SMP concentration is in 4.5-7mg/L in mud mixed liquid, EPS concentration PN/ in SMP in 90-130mg/L, mud mixed liquid PS range is 0.1-1.3, and PN/PS range is 1.5-3 in EPS.
5. passing through the method for control mixed liquor characteristics decelerating membrane pollution, feature in SNAD technique according to claim 4 It is, sewage sludge viscosity is 0.7-0.8mPa.s in mixed liquor.
6. passing through the method for control mixed liquor characteristics decelerating membrane pollution, feature in SNAD technique according to claim 5 It is, with the increase of membrane pollution resistance, PN/PS ratio increases in LB, and mud mixed liquid relative hydrophobicity RH is controlled in 35%- 60%.
7. passing through the method for control mixed liquor characteristics decelerating membrane pollution, feature in SNAD technique according to claim 6 It is, Zeta potential is in -13.2mV~-18.2mV in mixed liquor.
CN201910396596.4A 2019-05-13 2019-05-13 A method of passing through control mixed liquor characteristics decelerating membrane pollution in SNAD technique Pending CN110054287A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1600705A (en) * 2004-09-30 2005-03-30 清华大学 Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution
CN1974439A (en) * 2006-12-07 2007-06-06 江南大学 Method of inhibiting membrane contamination of membrane bioreactor
CN101700931A (en) * 2009-11-13 2010-05-05 江南大学 Method for regulating and controlling sludge quality in membrane bioreactor
CN103058373A (en) * 2013-01-04 2013-04-24 哈尔滨工业大学 Method for slowing down membrane pollution to A/O-MBR (membrane biologic reactor)
CN109179654A (en) * 2018-09-06 2019-01-11 北京化工大学 It is a kind of to flow up SNAD technique quick start method in the aerobic membrane bioreactor that declines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1600705A (en) * 2004-09-30 2005-03-30 清华大学 Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution
CN1974439A (en) * 2006-12-07 2007-06-06 江南大学 Method of inhibiting membrane contamination of membrane bioreactor
CN101700931A (en) * 2009-11-13 2010-05-05 江南大学 Method for regulating and controlling sludge quality in membrane bioreactor
CN103058373A (en) * 2013-01-04 2013-04-24 哈尔滨工业大学 Method for slowing down membrane pollution to A/O-MBR (membrane biologic reactor)
CN109179654A (en) * 2018-09-06 2019-01-11 北京化工大学 It is a kind of to flow up SNAD technique quick start method in the aerobic membrane bioreactor that declines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张原洁: "微氧升流式膜生物反应器SNAD启动与机制研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 *

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Application publication date: 20190726

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