CN109836025A - A kind of accurate sludge drainage system of sewage treatment and method - Google Patents
A kind of accurate sludge drainage system of sewage treatment and method Download PDFInfo
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Abstract
The invention discloses a kind of accurate sludge drainage system of sewage treatment and methods, primary sludge discharge amount and excess sludge discharge amount can be adjusted in real time in line TP detected value, pit level etc. after line TN detected value, concentration of going out in line COD detected value, primary sedimentation tank mud scraper electric current, primary sludge concentration, biological tank sludge concentration, remaining pump house sludge concentration and water outlet according to water inlet, it is advantageously implemented reasonable, the accurate discharge of sludge, promotion system is stablized, it ensures stable water outlet qualified discharge, reduces enterprise's production cost.
Description
Technical field
The present invention relates to technical field of sewage, and in particular to a kind of accurate sludge drainage system of sewage treatment and method.
Background technique
A large amount of sludge can be generated in sewage disposal process, mainly include sieve residue, heavy mud, dross and excess sludge
Deng.Sludge volume accounts for about the 0.3%-0.5% or so of processing water, and if waste water carries out advanced treating, sludge quantity is also possible to increase
0.5-1 times.With increasing for industrial water and domestic water, the amount of black water is also gradually increased, generated sludge quantity
Also it is gradually increased.Activated sludge is also used in sewage disposal process,.In sludge contain a large amount of harmful substances, including heavy metal,
Bacterium, pathogen etc., such as deal with improperly, may cause large effect to environment.By be aerated make by microorganism group at
Activated sludge is sufficiently mixed with dirty organic pollutants substance and contacts, and then degrades and absorb and decompose, the effect of aeration be to
Oxygen necessary to supply microorganism growth and decomposing organic matter in biological tank, and play mixing, make activated sludge and
Organic matter comes into full contact with.In biological tank, the floc sludge particle of suspension being largely visually observed, this part is exactly activity
Sludge wadding body, as organic pollutant is decomposed, aeration tank all has a net increase of a part of activated sludge daily, this part is called remaining work
Property sludge, in excess sludge other than a part needs to flow back, remaining requires to be discharged to and carry out except sewage disposal system
Subsequent appropriateization processing and disposition.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of accurate sludge drainage system of sewage treatment and method, can according into
The online COD detected value of water, primary sedimentation tank mud scraper electric current, primary sludge concentration, biological tank sludge concentration, remaining pump house sludge concentration
Primary sludge discharge amount is adjusted in real time in line TP detected value, pit level etc. after line TN detected value, concentration of going out with water outlet and is remained
Remaining sludge discharge is advantageously implemented reasonable, the accurate discharge of sludge, and promotion system is stablized, and ensures stable water outlet qualified discharge.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
Design a kind of accurate sludge drainage system of sewage treatment, including treatment tank group, primary sludge pump house, residual sludge pump
Room and sludge treatment pond group, the treatment tank group include the intake pool for being sequentially communicated setting, setting pot, primary sedimentation tank group, life
Object pond group, secondary settling tank and outlet canal；The sludge treatment pond group include the pre-concentration pond set gradually, concentration forebay, thickener,
After-bay and digester is concentrated；
The primary sedimentation tank group includes more than one primary sedimentation tank, and primary sludge pump house is equipped with beside the primary sedimentation tank group,
First mattress sinking dredge pump group is equipped in the primary sludge pump house, mattress sinking dredge pump group at the beginning of each primary sedimentation tank is one corresponding is described just heavy
Spoil disposal pump group is used to correspond to the mud discharging in primary sedimentation tank and carries out subsequent processing to concentration after-bay；
The biological tank group includes more than one biological tank, and excess sludge pond is provided with outside the secondary settling tank, described
In mud discharging to excess sludge pond in secondary settling tank, the top in the excess sludge pond is arranged in the excess sludge pump house,
Excess sludge pump group and sludge reflux pump group, the corresponding sludge reflux of each biological tank are equipped in the excess sludge pump house
Pump group and an excess sludge pump group, the sludge reflux pump group are used for the sludge reflux in excess sludge pond to corresponding
Biological tank, the excess sludge pump group are used to the mud discharging in excess sludge pond to pre-concentration pond carrying out subsequent processing；
It is provided with COD on-line detector in the intake pool, feed water flow meter is equipped with before the primary sedimentation tank, in institute
Mud scraper ammeter is equipped in the primary sedimentation tank stated, in the end of the biological tank, primary sludge pump house and excess sludge pump house
It is inside equipped with sludge concentration on-line detector, is equipped with water outlet TP and TN on-line detector in the outlet canal；Before the concentration
Liquidometer and sludge concentration on-line detector are equipped in pond and concentration after-bay.
In the above-mentioned technical solutions, sewage to be processed successively passes through intake pool in processing pond group, setting pot, just heavy
Pond, biological tank, secondary settling tank and outlet canal.The sludge generated in primary sedimentation tank is discharged into concentration after-bay by first mattress sinking dredge pump group
Wait subsequent processing；The sludge generated in secondary settling tank, a part are flowed back into biological tank by sludge reflux pump group, another part
It is discharged into pre-concentration pond by excess sludge pump group and waits subsequent processing.
Activated sludge is sufficiently mixed with organic pollution materials in sewage by aeration in biological tank to contact, and then is degraded and inhaled
It receives and decomposes, as organic pollutant is decomposed, the activated sludge in biological tank is being proliferated always, and the sludge of proliferation subtracts itself
The sludge of oxygenolysis is exactly excess sludge.The water outlet of biological tank is mixed liquor, is flowed in secondary settling tank, and secondary settling tank passes through precipitating
Effect, supernatant water outlet carry out subsequent processing, and sludge a part of secondary settling tank flows back into biological tank, another part excess sludge row
It is put into sludge-tank and waits subsequent processing.Excess sludge pond is set outside secondary settling tank, the mud discharging in secondary settling tank to remaining dirt
In mud sump, then by sludge reflux pump group by a part of sludge reflux to biological tank, another part passes through excess sludge pump group
It is discharged into sludge-tank and carries out subsequent processing.
Preferably, the secondary settling tank is more than one, and the excess sludge pond and corresponding excess sludge pump house are also one
More than a, each secondary settling tank and corresponding excess sludge pond, excess sludge pump house are divided into one group；Or more than one two is heavy
Pond is divided into one group with corresponding excess sludge pond, excess sludge pump house；Wherein, a biological tank corresponds to one group of secondary settling tank
With excess sludge pond, excess sludge pump house；Or more than one biological tank corresponds to one group of secondary settling tank jointly and residue is dirty
Mud sump, excess sludge pump house.
Preferably, coarse rack, intake pump and fine fack, the COD on-line checking are disposed in the intake pool
Instrument is arranged at the fine fack.
Preferably, the biological tank includes the pre- anoxic pond set gradually, anaerobic pond, anoxic gallery and aerobic gallery, institute
State the end that the aerobic gallery is arranged in the sludge concentration on-line detector in biological tank.
Preferably, the just mattress sinking dredge pump group is made of multiple sludge pumps, wherein each sludge pump correspondence is electrically connected with
Frequency converter；The sludge pump includes screw pump and plunger pump: the model EH2650-V-W201 of the screw pump, separate unit flow
For 50m3/ h, lift 20m, power 15KW, the corresponding frequency converter frequency of the screw pump are not less than 10Hz；The plunger pump
Model YB-200, separate unit flow be 25m3/ h, pressure 0.1-2.5MPa, power 22KW, corresponding frequency converter frequency is not
Less than 10Hz.The arranged moisture percentage in sewage sludge of first mattress sinking dredge pump group is lower, is 95% or so, and screw pump flow trim, pressure fluctuation are small,
Vortex is not formed when conveying sludge, and sludge conveying effect lower for moisture content is more preferable.Frequency converter is arranged can be preferably real
Now just in mattress sinking dredge pump group each sludge pump independent control, the quantity that the convenient sludge pump of adjustment in real time opens and closes.
The excess sludge pump group and sludge reflux pump group are made of multiple submerged centrifugal pumps, wherein each diving is centrifuged
Pump correspondence is electrically connected with frequency converter；The separate unit flow of the submerged centrifugal pump is 180m3/ h, lift 15m, power are
15KW；The corresponding frequency converter frequency of the submerged centrifugal pump is not less than 10Hz.The arranged moisture percentage in sewage sludge of excess sludge pump group is higher,
It is 99% or so, submerged centrifugal pump is all made of in excess sludge pump group and sludge reflux pump group, conveys this higher portion of moisture content
Divide the more efficient of excess sludge.Setting frequency converter can be better achieved each in excess sludge pump group and sludge reflux pump group
The independent control of submerged centrifugal pump, the quantity that the convenient submerged centrifugal pump of adjustment in real time opens and closes.
The invention further relates to a kind of accurate sludge discharging methods of sewage treatment, use above-mentioned sludge drainage system, including the following steps:
(1) the first mattress sinking mud amount of single primary sedimentation tank calculates: just heavy sludge volume accounting valueV in formula
For just heavy sludge volume accounting value, unit m3/h；
Q is primary sedimentation tank inflow, unit m3/ h obtains primary sedimentation tank inflow by the feed water flow meter being arranged before primary sedimentation tank
Value；
η is removal rate, %, in terms of 80%；
Co is inlet COD concentration, and it is dense to obtain influent COD by the COD on-line detector being arranged in intake pool by unit mg/L
Angle value；
P is moisture percentage in sewage sludge, %, and
MLSS is primary sludge concentration, and unit mg/L is examined online by the sludge concentration being arranged in primary sludge pipeline
It surveys instrument and obtains primary sludge concentration；
ρ is precipitating sludge density, with 1000kg/m3Meter；
The first heavy sludge volume of single primary sedimentation tank is Qi, corresponding sludge concentration is MLSSi, then the dirt of all primary sedimentation tank discharges
Total primary sludge concentration MLSS after mud mixingIt is just heavy=∑ (Qi*MLSSi)/∑Qi
(2) the corresponding just mattress sinking dredge pump group of each primary sedimentation tank is carried out according to the first heavy sludge volume accounting value V that step (1) calculates
Spoil disposal, system optimize adjustment according to the variation of primary sludge concentration, primary sludge moisture content general control 90%-93% it
Between (100~70g/L of sludge concentration)；Just heavy sludge volume is directly proportional to primary sludge concentration.It is just heavy when primary sludge concentration reduces
Sludge volume should be reduced therewith；Conversely, primary sludge concentration increases, just heavy sludge volume should increase therewith.By changing just mattress sinking mud
To realize, just heavy sludge volume adjusts the frequency converter frequency of pump group configuration.
According to the method for the first heavy sludge volume of the variation adjustment of primary sludge concentration are as follows:
1. primary sludge concentration range is between 85~75g/L, spoil disposal is carried out according to first heavy sludge volume accounting value V；
2. sludge concentration of sinking originally is greater than 85g/L, just heavy sludge volume accounting value is adjusted to V1=(1+20%) * V, unit
m3/ h, round numbers；
3. just heavy sludge volume accounting value is adjusted to V when sludge concentration is less than 75g/L2=(1-20%) * V, unit m3/ h, takes
Integer；
4. sank sludge volume originally lower than the minimum mud amount that first mattress sinking dredge pump group requires, the first mattress sinking dredge pump group is temporarily ceased
Spoil disposal, stop sludge-drainage time=24- just heavy minimum mud amount that just mattress sinking dredge pump requires of sludge volume * 24/, unit hour；
5. the first of single primary sedimentation tank is sunk when the sum of first heavy sludge volume of each primary sedimentation tank is greater than required just mattress sinking mud total amount
Sludge volume accounting value is adjusted to V3The first heavy sludge volume accounting value of the first heavy sludge volume accounting value/N number of primary sedimentation tank of=primary sedimentation tank
The sum of just mattress sinking mud total amount needed for *, N be the number of primary sedimentation tank；
Individually the corresponding remaining sludge volume of biological tank is Qs, corresponding sludge concentration is MLSSs, then all biological tanks are corresponding arranges
The mixed excess sludge concentration MLSS of the excess sludge putIt is remaining=∑ (Qs*MLSSs)/∑Qs；
(3) the remaining sludge volume of the corresponding excess sludge pump group of single biological tank calculates:
MLSS in formula1For aerobic end sludge concentration, by the sludge concentration that aerobic gallery end in biological tank is arranged in
On-line detector obtains the value, unit mg/L；
MLSS0For preset biological tank sludge target control concentration, unit mg/L；
VBiological tankFor biological tank pool capacity, unit m3；
RSS is returned sludge concentration, and being obtained by the sludge concentration on-line detector being arranged in excess sludge pump house should
Value, unit mg/L；
Under normal circumstances, the discharge amount of excess sludge is directly proportional to biological tank sludge concentration, and biological tank sludge concentration increases,
Excess sludge discharge amount should increase accordingly, and be examined online by the sludge concentration being arranged in biological tank end and excess sludge pump house
Instrument real-time detection sludge concentration is surveyed, according to the sludge concentration detected, excess sludge is realized by control excess sludge pump group
The adjustment of discharge amount.The size of excess sludge discharge amount by open and close excess sludge pump group in sludge pump quantity and
Frequency is adjusted to control.
(4) sludge age is calculated
MLSS in formula1For aerobic end sludge concentration, by the sludge concentration that aerobic gallery end in biological tank is arranged in
On-line detector obtains the value, unit mg/L；
VBiological tankFor biological tank pool capacity, unit m3；
RSS is returned sludge concentration, and being obtained by the sludge concentration on-line detector being arranged in excess sludge pump house should
Value, unit mg/L；
Q is the corresponding remaining sludge volume of single biological tank, unit m3/d；
The control range of default sludge age limits the odd-numbered day maximum sludge volume and most of excess sludge according to the value of sludge age
Small sludge volume:
When the odd-numbered day sludge volume of excess sludge is lower than the minimum sludge volume * 24 that excess sludge sludge pump allows, unit m3/
D, the minimum sludge volume that odd-numbered day runing time=excess sludge odd-numbered day sludge volume/sludge pump of excess sludge sludge pump allows；When
When the value of sludge age SRT reaches preset sludge age minimum value, separate unit excess sludge sludge pump remaining spoil disposal maximum daily
Amount is 4320m3；
When sludge concentration lower limit, that is, 3000mg/L needed for the 4h mean value < of the aerobic end sludge concentration of biological tank, stopping pair
The discharge for the excess sludge pump group answered, until the value of sludge age SRT is restored to preset range；
Every 4h recalculates remaining sludge volume accounting value, when the remaining spoil disposal of the corresponding excess sludge pump group of each biological tank
When amount is greater than required remaining spoil disposal total amount, the remaining sludge volume of the corresponding remaining sludge volume=biological tank of single biological tank is calculated
Residue spoil disposal total amount needed for the sum of the remaining sludge volume accounting value of value/N number of biological tank *.
Preferably, the level value that concentration after-bay is obtained according to the liquidometer in setting after concentration pond, according to concentration after-bay
The actual just heavy sludge volume of liquid level variation control and remaining sludge volume, control mode is constant liquis position control:
The Liquid level of after-bay will be concentrated in a default range in I, and system judges that after-bay is once concentrated per hour
Liquid level variation；
When after-bay inputiing mud volume is concentrated greater than digester inputiing mud volume, the liquid level that after-bay is concentrated rising situation II, will occur, by
Liquid level H before one hour1Rise to H2, at this time, it may be necessary to reduce concentration after-bay inputiing mud volume, adjustment concentration after-bay inputiing mud volume Q2=disappear
Change pond inputiing mud volume Q1；
Concentration after-bay needs reduced mud amount Q3=(H2-H1) * concentration after-bay sectional area, then it is former that after-bay inputiing mud volume=Q is concentratedFirst 1
+QResidue 1=Q3+Q1, Q can be obtainedResidue 1, wherein QFirst 1、QResidue 1Respectively former total first heavy sludge volume and total thickener mud volume；
If the ratio of new concentration after-bay inputiing mud volume and former concentration after-bay inputiing mud volume is a, a=Q1/(Q3+Q1)=Q1/(QFirst 1+
QResidue 1), then the practical just heavy sludge volume of single primary sedimentation tank be adjusted to=primary sedimentation tank originally sinks sludge volume * a；Single biological tank pair
The corresponding original residue sludge volume * a of the real surplus sludge volume answered=biological tank；
When after-bay inputiing mud volume is concentrated less than digester inputiing mud volume, the liquid level that after-bay is concentrated declining situation III, will occur, by
Liquid level H before one hour1Drop to H2, at this time, it may be necessary to increase concentration after-bay inputiing mud volume, adjustment concentration after-bay inputiing mud volume Q2=disappear
Change pond inputiing mud volume Q1,
After-bay, which is concentrated, needs increased mud amount Q3=(H1-H2) * concentration after-bay sectional area, then it is former that after-bay inputiing mud volume=Q is concentratedFirst 1
+QResidue 1=Q1-Q3, Q can be obtainedResidue 1, wherein QFirst 1、QResidue 1Respectively former total first heavy sludge volume and total thickener mud volume；
If new concentration after-bay inputiing mud volume and former concentration after-bay inputiing mud volume ratio are a, then a=Q1/(Q1-Q3).It is then single first
The practical just heavy sludge volume in heavy pond is adjusted to=and the primary sedimentation tank originally sinks sludge volume * a；The individually corresponding real surplus row of biological tank
The corresponding original residue sludge volume * a of the mud amount=biological tank.
Preferably, the level value that concentration after-bay is obtained according to the liquidometer in setting after concentration pond, according to concentration after-bay
The actual just heavy sludge volume of liquid level variation control and remaining sludge volume, control mode be according to resource optimization need to control it is dense
Pit level after contracting:
By the Liquid level that after-bay is concentrated in the range of Hmin~Hmax, according to electricity consumption " spike Pinggu " period, reduce
The thickener of spike period 8:00-12:00,18:00-22:00 runs number of units, achieve the purpose that it is energy-saving, after control concentration
The liquid level in pond is not less than Hmin, the pond blender safe and stable operation after guaranteeing concentration, and pit level is not higher than after control concentration
Hmax avoids concentration after-bay overflow from influencing effluent quality；
Pit level reaches the control node of Hmax, daily 8:00,18:00 in daily 8:00,18:00 after control concentration
Thickener is automatically closed, stops remaining spoil disposal；Pit level is reduced to when Hmin after concentration or timing node has arrived 12:00,22:
When 00, restore the operation of thickener according to digester inputiing mud volume, restores remaining spoil disposal；
When restoring thickener work for the first time, pit level is H after concentration1, the thickener available machine time is denoted as t1, next
Concentration after-bay control timing node 8:00 or 18:00 are denoted as t2, then pit level increasing value after being concentrated per hour after thickener is opened
Δ H=(Hmax-H1)/(t2-t1), concentration after-bay increases inputiing mud volume Δ Q=Δ H* concentration after-bay sectional area=(Hmax- per hour
H1)/(t2-t1) * concentration after-bay sectional area；
Then total practical just heavy sludge volume is adjusted to QJust=∑ Qi/(∑Qi+∑Qs)*(ΔQ+QDigestion), single primary sedimentation tank
Practical just heavy sludge volume Qi=Qi/∑Qi*QJust；Total real surplus sludge volume QIt is surplus=∑ Qs/(∑Qi+∑Qs)*(ΔQ+QDigestion), it is single
The corresponding real surplus sludge volume Q of a biological tanks=Qs/∑Qs*QIt is surplus；
According to digester inputiing mud volume QDigestion=QDense after-bayΔ Q=QFirst 1+QResidue 1, acquire thickener mud volume QResidue 1；QFirst 1、QResidue 1、
QDense after-bayRespectively first heavy sludge volume, thickener mud volume, concentration after-bay inputiing mud volume；
Pit level changes after the primary concentration of judgement per hour, adjusts just heavy sludge volume and remaining spoil disposal as procedure described above
Amount.
Preferably, Liquid level range Hmin~Hmax that after-bay is concentrated is 1.7~3.4m.
Preferably, the adjustment mode of the inputiing mud volume of thickener are as follows:
According to QDense after-bay*MLSSDense after-bay=QResidue 1*MLSSResidue 1+∑(Qi*MLSSi), MLSS can be obtainedResidue 1, according to MLSSResidue 1It adjusts
Whole thickener mud volume；Wherein QDense after-bayFor after-bay inputiing mud volume, MLSS is concentratedDense after-bayFor after-bay sludge concentration, Q is concentratedResidue 1For concentration
Machine mud volume, MLSSResidue 1For thickener mud extraction concentration.
QResidue 1*MLSSResidue 1=QResidue 2*MLSSResidue 2, QResidue 2、MLSSResidue 2The respectively total inputiing mud volume of thickener and thickener is into mud
Sludge concentration；The total inputiing mud volume of thickener per hour is acquired according to solid conservation, in conjunction with thickener processing capacity, determines that thickener is opened
Open number of units.
Preferably, the value that water outlet TP and TN is obtained by the water outlet TP and TN on-line detector being arranged in outlet canal, passes through
The COD on-line detector being arranged in intake pool obtains inlet COD concentration, when sinking that sludge volume is excessive or influent COD is too low originally, holds
It easily causes water outlet TP and TN to increase, therefore total first mattress sinking mud is adjusted according to inlet COD concentration value and the value of water outlet TP and TN
Amount:
When inlet COD concentration value is lower than 200mg/L, and continues 6h or more, suspend just mattress sinking mud, is changed to the continuously row of emptying
Mud；
The variation of water outlet TP and TN is judged every 2h, and when continuous rise trend occurs in the value of water outlet TP or TN, then reduction is first
Mattress sinking dredge pump group frequency converter frequency, to reduce total first heavy sludge volume, until water outlet TP, TN restore normally, adjustment mode are as follows:
12mg/L is risen to when water outlet TP rises to 0.25mg/L or TN, then total first heavy sludge volume is reduced to original two
/ mono-；13mg/L is risen to when water outlet TP rises to 0.35mg/L or TN, then total first heavy sludge volume is reduced to original two
/ mono-；14mg/L is risen to when water outlet TP rises to 0.40mg/L or TN, suspends just mattress sinking mud, is changed to emptying spoil disposal；
If just heavy sludge volume is too small, primary sedimentation tank mud scraper electric current is be easy to cause to increase, influences mud scraper safe operation, because
This, when primary sedimentation tank mud scraper electric current continue it is higher to mud scraper safe operation maximum current 95% when, if effluent quality is normal,
System increases just heavy sludge volume by increasing first mattress sinking dredge pump group frequency converter frequency, guarantees mud scraper operational safety；If water outlet
Water quality is higher, then primary sedimentation tank is changed to emptying spoil disposal, guarantees mud scraper operational safety；
Wherein, the priority of mud scraper current regulation is lower than the priority that water outlet TP and TN regulates and controls, i.e., preferentially according to water outlet
The value of TP and TN regulates and controls total first heavy sludge volume, and then regulates and controls total first mattress sinking mud according to primary sedimentation tank mud scraper electric current
Amount.
The beneficial effects of the present invention are:
1. the present invention can obtain inlet COD concentration by the way that COD on-line detector and flowmeter is arranged in intake pool in real time
And flow, and the data such as primary sludge moisture content, the online TN, TP of water outlet, digestion inputiing mud volume are combined, in effluent quality situation up to standard
Under, accounting in real time adjusts just heavy sludge volume, and the adjustment of first heavy sludge volume is realized by controlling first mattress sinking dredge pump group.
2. the present invention can be such that primary sludge moisture content is effectively reduced, be maintained at by controlling primary sludge sludge volume
On the one hand 90%-93% makes to be buffered into primary sedimentation tank there are relatively stable primary sludge after primary sludge moisture content reduces
The impacts such as water water, carbon source reduction, uniform and stable primary sedimentation tank water outlet；On the other hand make primary sludge in the primary sedimentation tank residence time
Increase, by sludge hydrolysis, acidification, improve the biodegradability of water inlet, macromolecular difficult to degrade is made to be hydrolyzed to small organic molecule,
Primary sedimentation tank water outlet carbon source is further increased, has for system dephosphorization denitrogenation and is obviously promoted effect.
3. the present invention can obtain biological tank end by the way that sludge concentration on-line detector is arranged in biological tank end in real time
Sludge concentration, the discharge amount of excess sludge can be adjusted according to the sludge concentration and aimed concn of biological tank end in real time,
It realizes biological tank concentration science, accurate, stability contorting, increases the stability of biosystem, to promote stable effluent quality
It lays a good foundation.The adjustment of excess sludge discharge amount is realized by control excess sludge pump group；It will by sludge reflux pump group
In a part of sludge reflux to biological tank, guarantee there are enough activated sludge to be reacted in biological tank.
It calculates the first heavy moisture content of each series 4. the present invention passes through, biological tank sludge concentration, digest the associated datas such as inputiing mud volume,
The just heavy and remaining sludge volume of each series of Proper Match, is conducive to the degree of automation for improving mud discharging, increases spoil disposal stability,
The problem of unstable regulation of online data can be made up to the full extent, so that spoil disposal process is more scientific, stable, safety；
Meanwhile the sludge pump in each spoil disposal pump group is controlled by frequency converter, according to required sludge discharge conditioning of mud pump frequency
Sludge discharge is controlled, artificial regulatory bring inexactness can be reduced so that mud discharging is more accurate is conducive to reality
Accurate spoil disposal, intelligent spoil disposal in existing sewage disposal process.This technology is easily installed, operates and controls, convenient in sewage treatment
Enterprise, which promotes, to be applicable in.
5. the present invention has obvious effect for reducing enterprise's production cost: after primary sedimentation tank is discharged carbon source increase, enterprise can
To reduce carbon source medicament investment, production cost is effectively reduced；Moisture content is that the first mattress sinking mud of 90%-93% can be without overrich
Contracting machine is directly entered sludge digestion system, advantageously reduces thickener power consumption and concentration pharmaceutical use, is further reduced life
Produce cost；System, which can according to need, reduces spike period thickener runing time, reduces electricity consumption unit price, is further reduced electricity consumption
Expense.
Detailed description of the invention
Fig. 1 is the processing flow schematic diagram of the accurate sludge drainage system of sewage treatment of the present invention；
Fig. 2 is the flow diagram of first mattress sinking mud；
Fig. 3 is a kind of flow diagram of mode of sludge reflux and excess sludge discharge, wherein each biological tank is corresponding
One group of secondary settling tank and excess sludge pond, excess sludge pump house；
Fig. 4 is the flow diagram of the another way of sludge sludge reflux and excess sludge discharge, plurality of biology
The corresponding one group of secondary settling tank in pond and excess sludge pond, excess sludge pump house.
Specific embodiment
Illustrate a specific embodiment of the invention below with reference to embodiment, but following embodiment is used only to be described in detail
The present invention does not limit the scope of the invention in any way.Related equipment component is as without especially in the examples below
Illustrate, is conventional equipment element；The related raw material of industry is commercially available regular industrial raw material unless otherwise instructed.
Embodiment 1: a kind of accurate sludge drainage system of sewage treatment, referring to figures 1-4, including treatment tank group, just heavy dirt
Dredge pump room, excess sludge pump house and sludge treatment pond group, treatment tank group include the intake pool for being sequentially communicated setting, sand setting
Pond, primary sedimentation tank group, biological tank group, secondary settling tank and outlet canal；Before sludge treatment pond group includes the pre-concentration pond set gradually, concentration
Pond, thickener, concentration after-bay and digester；
Primary sedimentation tank group includes more than one primary sedimentation tank, and primary sludge pump house is equipped with beside primary sedimentation tank group, in just heavy dirt
First mattress sinking dredge pump group is equipped in dredge pump room, mattress sinking dredge pump group at the beginning of each primary sedimentation tank is one corresponding, first mattress sinking dredge pump group is used for will be right
The mud discharging in primary sedimentation tank is answered to carry out subsequent processing to concentration after-bay；
Biological tank group includes more than one biological tank, and excess sludge pond, the dirt in secondary settling tank are provided with outside secondary settling tank
Mud is discharged into excess sludge pond, and the top in excess sludge pond is arranged in excess sludge pump house, is equipped in excess sludge pump house
Excess sludge pump group and sludge reflux pump group, the corresponding sludge reflux pump group of each biological tank and a residual sludge pump
Group, sludge reflux pump group are used for the sludge reflux in excess sludge pond to corresponding biological tank, and excess sludge pump group is used for will
Mud discharging in excess sludge pond carries out subsequent processing to pre-concentration pond；
COD on-line detector is provided in intake pool, primary sedimentation tank before be equipped with feed water flow meter, primary sedimentation tank in
Equipped with mud scraper ammeter, sludge concentration is equipped in the end of biological tank, primary sludge pump house and in excess sludge pump house
On-line detector is equipped with water outlet TP and TN on-line detector in outlet canal；Liquid level is equipped in pond and concentration after-bay before concentration
Meter and sludge concentration on-line detector.
Wherein, secondary settling tank is more than one, and excess sludge pond and corresponding excess sludge pump house are also more than one, each
Secondary settling tank and corresponding excess sludge pond, excess sludge pump house are divided into one group；Or more than one secondary settling tank with it is corresponding
Excess sludge pond, excess sludge pump house are divided into one group；Wherein, the corresponding one group of secondary settling tank of biological tank and excess sludge pond,
Excess sludge pump house, referring to Fig. 3；Or more than one biological tank corresponds to one group of secondary settling tank and excess sludge pond, residue jointly
Sludge pump house, referring to fig. 4.
Coarse rack, intake pump and fine fack are disposed in intake pool, COD on-line detector is arranged in fine fack
Place.Biological tank includes the pre- anoxic pond set gradually, anaerobic pond, anoxic gallery and aerobic gallery, the sludge concentration in biological tank
The end of aerobic gallery is arranged in on-line detector.
First mattress sinking dredge pump group is made of multiple sludge pumps, wherein each sludge pump correspondence is electrically connected with frequency converter；Spoil disposal
Pump includes screw pump and plunger pump: the model EH2650-V-W201 of screw pump, and separate unit flow is 50m3/ h, lift 20m,
Power is 15KW, and the corresponding frequency converter frequency of screw pump is not less than 10Hz；The model YB-200 of plunger pump, separate unit flow are
25m3/ h, pressure 0.1-2.5MPa, power 22KW, corresponding frequency converter frequency are not less than 10Hz.
Excess sludge pump group and sludge reflux pump group are made of multiple submerged centrifugal pumps, wherein each submerged centrifugal pump is equal
Correspondence is electrically connected with frequency converter；The separate unit flow of submerged centrifugal pump is 180m3/ h, lift 15m, power 15KW；Dive under water from
The corresponding frequency converter frequency of heart pump is not less than 10Hz.
Embodiment 2: a kind of accurate sludge discharging method of sewage treatment uses the sludge drainage system in embodiment 1, including following step
It is rapid:
(1) the first mattress sinking mud amount of single primary sedimentation tank calculates: just heavy sludge volume accounting valueV in formula
For just heavy sludge volume accounting value, unit m3/h；
Q is primary sedimentation tank inflow, unit m3/ h obtains primary sedimentation tank inflow by the feed water flow meter being arranged before primary sedimentation tank
Value；
η is removal rate, %, in terms of 80%；
Co is inlet COD concentration, and it is dense to obtain influent COD by the COD on-line detector being arranged in intake pool by unit mg/L
Angle value；
P is moisture percentage in sewage sludge, %, and
MLSS is primary sludge concentration, and unit mg/L is examined online by the sludge concentration being arranged in primary sludge pipeline
It surveys instrument and obtains primary sludge concentration；
ρ is precipitating sludge density, with 1000kg/m3Meter；
The first heavy sludge volume of single primary sedimentation tank is Qi, corresponding sludge concentration is MLSSi, then the dirt of all primary sedimentation tank discharges
Total primary sludge concentration MLSS after mud mixingIt is just heavy=∑ (Qi*MLSSi)/∑Qi
(2) the corresponding just mattress sinking dredge pump group of each primary sedimentation tank is carried out according to the first heavy sludge volume accounting value V that step (1) calculates
Spoil disposal, and according to the first heavy sludge volume of the variation of primary sludge concentration adjustment:
1. primary sludge concentration range is between 85~75g/L, spoil disposal is carried out according to first heavy sludge volume accounting value V；
2. sludge concentration of sinking originally is greater than 85g/L, just heavy sludge volume accounting value is adjusted to V1=(1+20%) * V, unit
m3/ h, round numbers；
3. just heavy sludge volume accounting value is adjusted to V when sludge concentration is less than 75g/L2=(1-20%) * V, unit m3/ h, takes
Integer；
4. sank sludge volume originally lower than the minimum mud amount that first mattress sinking dredge pump group requires, the first mattress sinking dredge pump group is temporarily ceased
Spoil disposal, stop sludge-drainage time=24- just heavy minimum mud amount that just mattress sinking dredge pump requires of sludge volume * 24/, unit hour；
5. the first of single primary sedimentation tank is sunk when the sum of first heavy sludge volume of each primary sedimentation tank is greater than required just mattress sinking mud total amount
Sludge volume accounting value is adjusted to V3The first heavy sludge volume accounting value of the first heavy sludge volume accounting value/N number of primary sedimentation tank of=primary sedimentation tank
The sum of just mattress sinking mud total amount needed for *, N be the number of primary sedimentation tank；
The remaining sludge volume of the corresponding excess sludge pump group of single biological tank is Qs, corresponding sludge concentration is MLSSs, then institute
There is the mixed excess sludge concentration MLSS of excess sludge of the corresponding discharge of biological tankIt is remaining=∑ (Qs*MLSSs)/∑Qs；
(3) the remaining sludge volume of the corresponding excess sludge pump group of single biological tank calculates:
MLSS in formula1For aerobic end sludge concentration, by the sludge concentration that aerobic gallery end in biological tank is arranged in
On-line detector obtains the value, unit mg/L；
MLSS0For preset biological tank sludge target control concentration, unit mg/L；
VBiological tankFor biological tank pool capacity, unit m3；
RSS is returned sludge concentration, and being obtained by the sludge concentration on-line detector being arranged in excess sludge pump house should
Value, unit mg/L；
(4) sludge age is calculated
MLSS in formula1For aerobic end sludge concentration, by the sludge concentration that aerobic gallery end in biological tank is arranged in
On-line detector obtains the value, unit mg/L；
VBiological tankFor biological tank pool capacity, unit m3；
RSS is returned sludge concentration, and being obtained by the sludge concentration on-line detector being arranged in excess sludge pump house should
Value, unit mg/L；
Q is the corresponding remaining sludge volume of single biological tank, unit m3/d；
The control range of default sludge age limits the odd-numbered day maximum sludge volume and most of excess sludge according to the value of sludge age
Small sludge volume:
When the odd-numbered day sludge volume of excess sludge is lower than the minimum sludge volume * 24 that excess sludge sludge pump allows, unit m3/
D, the minimum sludge volume that odd-numbered day runing time=excess sludge odd-numbered day sludge volume/sludge pump of excess sludge sludge pump allows；When
When the value of sludge age SRT reaches preset sludge age minimum value, separate unit excess sludge sludge pump remaining spoil disposal maximum daily
Amount is 2900m3；
When sludge concentration lower limit, that is, 3000mg/L needed for the 4h mean value < of the aerobic end sludge concentration of biological tank, stopping pair
The discharge for the excess sludge pump group answered, until the value of sludge age SRT is restored to preset range；
Every 4h recalculates remaining sludge volume accounting value, when the remaining spoil disposal of the corresponding excess sludge pump group of each biological tank
When amount is greater than required remaining spoil disposal total amount, the remaining sludge volume of the corresponding remaining sludge volume=biological tank of single biological tank is calculated
Residue spoil disposal total amount needed for the sum of the remaining sludge volume accounting value of value/N number of biological tank *.
The level value that concentration after-bay is obtained according to the liquidometer in setting after concentration pond becomes according to the liquid level of concentration after-bay
Change the actual just heavy sludge volume of control and remaining sludge volume, control mode is constant liquis position control:
The Liquid level of after-bay will be concentrated in a default range in I, and system judges that after-bay is once concentrated per hour
Liquid level variation；
When after-bay inputiing mud volume is concentrated greater than digester inputiing mud volume, the liquid level that after-bay is concentrated rising situation II, will occur, by
Liquid level H before one hour1Rise to H2, at this time, it may be necessary to reduce concentration after-bay inputiing mud volume, adjustment concentration after-bay inputiing mud volume Q2=disappear
Change pond inputiing mud volume Q1；
Concentration after-bay needs reduced mud amount Q3=(H2-H1) * concentration after-bay sectional area, then it is former that after-bay inputiing mud volume=Q is concentratedFirst 1
+QResidue 1=Q3+Q1, Q can be obtainedResidue 1, wherein QFirst 1、QResidue 1Respectively former total first heavy sludge volume and total thickener mud volume；
If the ratio of new concentration after-bay inputiing mud volume and former concentration after-bay inputiing mud volume is a, a=Q1/(Q3+Q1)=Q1/(QFirst 1+
QResidue 1), then the practical just heavy sludge volume of single primary sedimentation tank be adjusted to=primary sedimentation tank originally sinks sludge volume * a；Single biological tank pair
The corresponding original residue sludge volume * a of the real surplus sludge volume answered=biological tank；
When after-bay inputiing mud volume is concentrated less than digester inputiing mud volume, the liquid level that after-bay is concentrated declining situation III, will occur, by
Liquid level H before one hour1Drop to H2, at this time, it may be necessary to increase concentration after-bay inputiing mud volume, adjustment concentration after-bay inputiing mud volume Q2=disappear
Change pond inputiing mud volume Q1,
After-bay, which is concentrated, needs increased mud amount Q3=(H1-H2) * concentration after-bay sectional area, then it is former that after-bay inputiing mud volume=Q is concentratedFirst 1
+QResidue 1=Q1-Q3, Q can be obtainedResidue 1, wherein QFirst 1、QResidue 1Respectively former total first heavy sludge volume and total thickener mud volume；
If new concentration after-bay inputiing mud volume and former concentration after-bay inputiing mud volume ratio are a, then a=Q1/(Q1-Q3).It is then single first
The practical just heavy sludge volume in heavy pond is adjusted to=and the primary sedimentation tank originally sinks sludge volume * a；The individually corresponding real surplus row of biological tank
The corresponding original residue sludge volume * a of the mud amount=biological tank.
The level value that after-bay Liquid level obtains concentration after-bay according to the liquidometer in setting after concentration pond is concentrated, according to
The actual just heavy sludge volume of liquid level variation control and remaining sludge volume, control mode that after-bay is concentrated are the need according to resource optimization
Control pit level after being concentrated:
The Liquid level of after-bay will be concentrated in the range of Hmin~Hmax, such as 1.7~3.4m.According to electricity consumption, " spike is flat
Paddy " period, the thickener for reducing spike period 8:00-12:00,18:00-22:00 run number of units, reach energy-saving mesh
, the liquid level of control concentration after-bay is not less than Hmin, the pond blender safe and stable operation after guaranteeing concentration, control concentration after-bay
Liquid level is not higher than Hmax, and concentration after-bay overflow is avoided to influence effluent quality；
Pit level reaches the control node of Hmax, daily 8:00,18:00 in daily 8:00,18:00 after control concentration
Thickener is automatically closed, stops remaining spoil disposal；Pit level is reduced to when Hmin after concentration or timing node has arrived 12:00,22:
When 00, restore the operation of thickener according to digester inputiing mud volume, restores remaining spoil disposal；
When restoring thickener work for the first time, pit level is H after concentration1, the thickener available machine time is denoted as t1, next
Concentration after-bay control timing node 8:00 or 18:00 are denoted as t2, then pit level increasing value after being concentrated per hour after thickener is opened
Δ H=(Hmax-H1)/(t2-t1), concentration after-bay increases inputiing mud volume Δ Q=Δ H* concentration after-bay sectional area=(Hmax- per hour
H1)/(t2-t1) * concentration after-bay sectional area；
Then total practical just heavy sludge volume is adjusted to QJust=∑ Qi/(∑Qi+∑Qs)*(ΔQ+QDigestion), single primary sedimentation tank
Practical just heavy sludge volume Qi=Qi/∑Qi*QJust；Total real surplus sludge volume QIt is surplus=∑ Qs/(∑Qi+∑Qs)*(ΔQ+QDigestion), it is single
The corresponding real surplus sludge volume Q of a biological tanks=Qs/∑Qs*QIt is surplus；
According to digester inputiing mud volume QDigestion=QDense after-bayΔ Q=QFirst 1+QResidue 1, acquire thickener mud volume QResidue 1；QFirst 1、QResidue 1、
QDense after-bayRespectively first heavy sludge volume, thickener mud volume, concentration after-bay inputiing mud volume；
Pit level changes after the primary concentration of judgement per hour, adjusts just heavy sludge volume and remaining spoil disposal as procedure described above
Amount.
The adjustment mode of the inputiing mud volume of thickener are as follows:
According to QDense after-bay*MLSSDense after-bay=QResidue 1*MLSSResidue 1+∑(Qi*MLSSi), MLSS can be obtainedResidue 1, according to MLSSResidue 1It adjusts
Whole thickener mud volume；Wherein QDense after-bayFor after-bay inputiing mud volume, MLSS is concentratedDense after-bayFor after-bay sludge concentration, Q is concentratedResidue 1For concentration
Machine mud volume, MLSSResidue 1For thickener mud extraction concentration.
QResidue 1*MLSSResidue 1=QResidue 2*MLSSResidue 2, QResidue 2、MLSSResidue 2The respectively total inputiing mud volume of thickener and thickener is into mud
Sludge concentration；The total inputiing mud volume of thickener per hour is acquired according to solid conservation, in conjunction with thickener processing capacity, determines that thickener is opened
Open number of units.
The queuing capability of thickener opening sequence can be set in system.Such as:
Work as QResidue 2≦110m3/ h opens 1 small-sized thickener (power 132kw)；
Work as 110m3/h<QResidue 2≦150m3/ h opens 2 small-sized thickeners (power 132kw)；
Work as 150m3/h<QResidue 2≦200m3/ h opens 1 large-scale thickener (power 215kw)；
Work as 200m3/h<QResidue 2≦310m3/ h opens 1 large-scale thickener (power 215kw), 1 small-sized thickener (power
132kw)；
Work as 310m3/h<QResidue 2≦400m3/ h opens 2 large-scale thickener (power 215kw)；
Work as 400m3/h<QResidue 2≦510m3/ h opens 2 large-scale thickener (power 215kw), 1 small-sized thickener (power
132kw)；
Work as 510m3/h<QResidue 2≦600m3/ h opens 3 large-scale thickener (power 215kw)；
Work as 600m3/h<QResidue 2≦710m3/ h opens 3 large-scale thickener (power 215kw), 1 small-sized thickener (power
132kw)。
System judges that pit level changes after being once concentrated, and adjusts thickener inputiing mud volume as procedure described above per hour.
The value that water outlet TP and TN is obtained by the water outlet TP and TN on-line detector being arranged in outlet canal, by intake pool
The COD on-line detector of setting obtains inlet COD concentration, is adjusted according to inlet COD concentration value and the value of water outlet TP and TN total
First heavy sludge volume:
When inlet COD concentration value is lower than 200mg/L, and continues 6h or more, suspend just mattress sinking mud, is changed to the continuously row of emptying
Mud；
The variation of water outlet TP and TN is judged every 2h, and when continuous rise trend occurs in the value of water outlet TP or TN, then reduction is first
Mattress sinking dredge pump group frequency converter frequency, to reduce total first heavy sludge volume, until water outlet TP, TN restore normally, adjustment mode are as follows:
12mg/L is risen to when water outlet TP rises to 0.25mg/L or TN, then total first heavy sludge volume is reduced to original two
/ mono-；13mg/L is risen to when water outlet TP rises to 0.35mg/L or TN, then total first heavy sludge volume is reduced to original two
/ mono-；14mg/L is risen to when water outlet TP rises to 0.40mg/L or TN, suspends just mattress sinking mud, is changed to emptying spoil disposal；
When primary sedimentation tank mud scraper electric current continue it is higher to mud scraper safe operation maximum current 95% when, if effluent quality
Normally, system increases just heavy sludge volume by increasing first mattress sinking dredge pump group frequency converter frequency, guarantees mud scraper operational safety；If
Effluent quality is higher, then primary sedimentation tank is changed to emptying spoil disposal, guarantees mud scraper operational safety；
Wherein, the priority of mud scraper current regulation is lower than the priority that water outlet TP and TN regulates and controls, i.e., preferentially according to water outlet
The value of TP and TN regulates and controls total first heavy sludge volume, and then regulates and controls total first mattress sinking mud according to primary sedimentation tank mud scraper electric current
Amount.
The present invention is described in detail above in conjunction with embodiment, but person of ordinary skill in the field can manage
Solution, without departing from the purpose of the present invention, can also change each design parameter in above-described embodiment, be formed
Multiple specific embodiments are common variation range of the invention, are no longer described in detail one by one herein.
Claims (10)
1. a kind of accurate sludge drainage system of sewage treatment, which is characterized in that including treatment tank group, primary sludge pump house, residue
Sludge pump house and sludge treatment pond group, the treatment tank group include the intake pool, setting pot, primary sedimentation tank for being sequentially communicated setting
Group, biological tank group, secondary settling tank and outlet canal；The sludge treatment pond group includes the pre-concentration pond set gradually, forebay is concentrated, is dense
Contracting machine, concentration after-bay and digester；
The primary sedimentation tank group includes more than one primary sedimentation tank, primary sludge pump house is equipped with beside the primary sedimentation tank group, in institute
It states and is equipped with first mattress sinking dredge pump group in primary sludge pump house, mattress sinking dredge pump group at the beginning of each primary sedimentation tank is one corresponding, the just mattress sinking mud
Pump group is used to correspond to the mud discharging in primary sedimentation tank and carries out subsequent processing to concentration after-bay；
The biological tank group includes more than one biological tank, and excess sludge pond is provided with outside the secondary settling tank, and described two is heavy
In mud discharging to excess sludge pond in pond, the top in the excess sludge pond is arranged in the excess sludge pump house, in institute
It states and is equipped with excess sludge pump group and sludge reflux pump group in excess sludge pump house, the corresponding sludge reflux pump group of each biological tank
And an excess sludge pump group, the sludge reflux pump group are used for the sludge reflux in excess sludge pond to corresponding biology
Pond, the excess sludge pump group are used to the mud discharging in excess sludge pond to pre-concentration pond carrying out subsequent processing；
It is provided with COD on-line detector in the intake pool, feed water flow meter is equipped with before the primary sedimentation tank, described
Mud scraper ammeter is equipped in primary sedimentation tank, in the end of the biological tank, primary sludge pump house and in excess sludge pump house
Equipped with sludge concentration on-line detector, water outlet TP and TN on-line detector is equipped in the outlet canal；In the concentration forebay and
Liquidometer and sludge concentration on-line detector are equipped in concentration after-bay.
2. the accurate sludge drainage system of sewage treatment according to claim 1, which is characterized in that the secondary settling tank be one with
On, the excess sludge pond and corresponding excess sludge pump house are also more than one, each secondary settling tank and corresponding excess sludge
Pond, excess sludge pump house are divided into one group；Or more than one secondary settling tank and corresponding excess sludge pond, excess sludge pump house
It is divided into one group；Wherein, a biological tank corresponds to one group of secondary settling tank and excess sludge pond, excess sludge pump house；Or one
A above biological tank corresponds to one group of secondary settling tank and excess sludge pond, excess sludge pump house jointly.
3. the accurate sludge drainage system of sewage treatment according to claim 1, which is characterized in that successively set in the intake pool
It is equipped with coarse rack, intake pump and fine fack, the COD on-line detector is arranged at the fine fack；The biological tank includes
Pre- anoxic pond, anaerobic pond, anoxic gallery and the aerobic gallery set gradually, the sludge concentration on-line detector in the biological tank
The end of the aerobic gallery is set.
4. the accurate sludge drainage system of sewage treatment according to claim 1, which is characterized in that the just mattress sinking dredge pump group is by more
A sludge pump composition, wherein each sludge pump correspondence is electrically connected with frequency converter；The sludge pump includes screw pump and plunger pump:
The model EH2650-V-W201 of the screw pump, separate unit flow are 50m3/ h, lift 20m, power 15KW, the spiral shell
Bar pumps corresponding frequency converter frequency and is not less than 10Hz；The model YB-200 of the plunger pump, separate unit flow are 25m3/ h, pressure
0.1-2.5MPa, power 22KW, corresponding frequency converter frequency are not less than 10Hz.
The excess sludge pump group and sludge reflux pump group are made of multiple submerged centrifugal pumps, wherein each submerged centrifugal pump is equal
Correspondence is electrically connected with frequency converter；The separate unit flow of the submerged centrifugal pump is 180m3/ h, lift 15m, power 15KW；Institute
The corresponding frequency converter frequency of submerged centrifugal pump is stated not less than 10Hz.
5. a kind of accurate sludge discharging method of sewage treatment, which is characterized in that using the sludge drainage system in claim 1, including it is following
Step:
(1) the first mattress sinking mud amount of single primary sedimentation tank calculates: just heavy sludge volume accounting valueV is first in formula
Heavy sludge volume accounting value, unit m3/h；
Q is primary sedimentation tank inflow, unit m3/ h obtains the value of primary sedimentation tank inflow by the feed water flow meter being arranged before primary sedimentation tank；
η is removal rate, %, in terms of 80%；
Co is inlet COD concentration, and unit mg/L obtains inlet COD concentration by the COD on-line detector being arranged in intake pool
Value；
P is moisture percentage in sewage sludge, %, and
MLSS is primary sludge concentration, and unit mg/L passes through the sludge concentration on-line detector being arranged in primary sludge pipeline
Obtain primary sludge concentration；
ρ is precipitating sludge density, with 1000kg/m3Meter；
The first heavy sludge volume of single primary sedimentation tank is Qi, corresponding sludge concentration is MLSSi, then the sludge of all primary sedimentation tank discharges is mixed
Total primary sludge concentration MLSS after conjunctionIt is just heavy=∑ (Qi*MLSSi)/∑Qi
(2) the corresponding just mattress sinking dredge pump group of each primary sedimentation tank is arranged according to the first heavy sludge volume accounting value V that step (1) calculates
Mud, and according to the first heavy sludge volume of the variation of primary sludge concentration adjustment:
1. primary sludge concentration range is between 85~75g/L, spoil disposal is carried out according to first heavy sludge volume accounting value V；
2. sludge concentration of sinking originally is greater than 85g/L, just heavy sludge volume accounting value is adjusted to V1=(1+20%) * V, unit m3/ h,
Round numbers；
3. just heavy sludge volume accounting value is adjusted to V when sludge concentration is less than 75g/L2=(1-20%) * V, unit m3/ h is rounded
Number；
4. sank sludge volume originally lower than the minimum mud amount that first mattress sinking dredge pump group requires, the row of the first mattress sinking dredge pump group is temporarily ceased
Mud stops sludge-drainage time=24- just heavy minimum mud amount that just mattress sinking dredge pump requires of sludge volume * 24/, unit hour；
5. when the sum of first heavy sludge volume of each primary sedimentation tank is greater than required just mattress sinking mud total amount, the first mattress sinking mud of single primary sedimentation tank
Amount accounting value is adjusted to V3The sum of the first heavy sludge volume accounting value of first heavy sludge volume accounting value/N number of primary sedimentation tank of=primary sedimentation tank *
Required just mattress sinking mud total amount, N are the number of primary sedimentation tank；
The remaining sludge volume of the corresponding excess sludge pump group of single biological tank is Qs, corresponding sludge concentration is MLSSs, then all lifes
The mixed excess sludge concentration MLSS of excess sludge of the corresponding discharge in object pondIt is remaining=∑ (Qs*MLSSs)/∑Qs；
(3) the remaining sludge volume of the corresponding excess sludge pump group of single biological tank calculates:
MLSS in formula1For aerobic end sludge concentration, the sludge concentration by the way that aerobic gallery end in biological tank is arranged in is examined online
It surveys instrument and obtains the value, unit mg/L；
MLSS0For preset biological tank sludge target control concentration, unit mg/L；
VBiological tankFor biological tank pool capacity, unit m3；
RSS is returned sludge concentration, obtains the value by the sludge concentration on-line detector being arranged in excess sludge pump house, single
Position mg/L；
(4)
MLSS in formula1For aerobic end sludge concentration, the sludge concentration by the way that aerobic gallery end in biological tank is arranged in is examined online
It surveys instrument and obtains the value, unit mg/L；
VBiological tankFor biological tank pool capacity, unit m3；
RSS is returned sludge concentration, obtains the value by the sludge concentration on-line detector being arranged in excess sludge pump house, single
Position mg/L；
Q is the corresponding remaining sludge volume of single biological tank, unit m3/d；
The control range of default sludge age, the odd-numbered day maximum sludge volume and most float of excess sludge are limited according to the value of sludge age
Mud amount:
When the odd-numbered day sludge volume of excess sludge is lower than the minimum sludge volume * 24 that excess sludge sludge pump allows, unit m3/ d is remained
The minimum sludge volume that the odd-numbered day runing time of remaining sludge sludge pump=excess sludge odd-numbered day sludge volume/sludge pump allows；Work as sludge
When the value of age SRT reaches preset sludge age minimum value, separate unit excess sludge sludge pump remaining sludge volume maximum daily is
4320m3；
When sludge concentration lower limit, that is, 3000mg/L needed for the 4h mean value < of the aerobic end sludge concentration of biological tank, stop corresponding
The discharge of excess sludge pump group, until the value of sludge age SRT is restored to preset range；
Every 4h recalculates remaining sludge volume accounting value, when the remaining sludge volume of the corresponding excess sludge pump group of each biological tank is big
When required remaining spoil disposal total amount, remaining sludge volume accounting value/N of the corresponding remaining sludge volume=biological tank of single biological tank
Residue spoil disposal total amount needed for the sum of the remaining sludge volume accounting value of a biological tank *.
6. the accurate sludge discharging method of sewage treatment according to claim 5, which is characterized in that according in setting after concentration pond
Liquidometer obtain the level value of concentration after-bay, according to the actual just heavy sludge volume of liquid level variation control and residue of concentration after-bay
Sludge volume, control mode are constant liquis position control:
The Liquid level of after-bay will be concentrated in a default range in I, and system judges the liquid level that after-bay is once concentrated per hour
Variation；
When after-bay inputiing mud volume is concentrated greater than digester inputiing mud volume, the liquid level that after-bay is concentrated rising situation, You Yi little II, will occur
When before liquid level H1Rise to H2, at this time, it may be necessary to reduce concentration after-bay inputiing mud volume, adjustment concentration after-bay inputiing mud volume Q2=digester
Inputiing mud volume Q1；
Concentration after-bay needs reduced mud amount Q3=(H2-H1) * concentration after-bay sectional area, then it is former that after-bay inputiing mud volume=Q is concentratedFirst 1+QResidue 1
=Q3+Q1, Q can be obtainedResidue 1, wherein QFirst 1、QResidue 1Respectively former total first heavy sludge volume and total thickener mud volume；
If the ratio of new concentration after-bay inputiing mud volume and former concentration after-bay inputiing mud volume is a, a=Q1/(Q3+Q1)=Q1/(QFirst 1+
QResidue 1), then the practical just heavy sludge volume of single primary sedimentation tank be adjusted to=primary sedimentation tank originally sinks sludge volume * a；Single biological tank pair
The corresponding original residue sludge volume * a of the real surplus sludge volume answered=biological tank；
When after-bay inputiing mud volume is concentrated less than digester inputiing mud volume, the liquid level that after-bay is concentrated declining situation, You Yi little III, will occur
When before liquid level H1Drop to H2, at this time, it may be necessary to increase concentration after-bay inputiing mud volume, adjustment concentration after-bay inputiing mud volume Q2=digester
Inputiing mud volume Q1,
After-bay, which is concentrated, needs increased mud amount Q3=(H1-H2) * concentration after-bay sectional area, then it is former that after-bay inputiing mud volume=Q is concentratedFirst 1+QResidue 1
=Q1-Q3, Q can be obtainedResidue 1, wherein QFirst 1、QResidue 1Respectively former total first heavy sludge volume and total thickener mud volume；
If new concentration after-bay inputiing mud volume and former concentration after-bay inputiing mud volume ratio are a, then a=Q1/(Q1-Q3).Then single primary sedimentation tank
Practical just heavy sludge volume be adjusted to=primary sedimentation tank originally sinks sludge volume * a；The corresponding real surplus sludge volume of single biological tank
The corresponding original residue sludge volume * a of=biological tank.
7. the accurate sludge discharging method of sewage treatment according to claim 5, which is characterized in that according in setting after concentration pond
Liquidometer obtain the level value of concentration after-bay, according to the actual just heavy sludge volume of liquid level variation control and residue of concentration after-bay
Sludge volume, control mode are according to pit level after the control concentration of the needs of resource optimization:
By the Liquid level that after-bay is concentrated in the range of Hmin~Hmax, according to electricity consumption " spike Pinggu " period, spike is reduced
The thickener of period 8:00-12:00,18:00-22:00 runs number of units, achieve the purpose that it is energy-saving, control concentration after-bay
Liquid level is not less than Hmin, the pond blender safe and stable operation after guaranteeing concentration, and pit level is not higher than Hmax after control concentration, keeps away
Exempt from that after-bay overflow influence effluent quality is concentrated；
Pit level reaches the control node of Hmax in daily 8:00,18:00 after control concentration, and daily 8:00,18:00 are automatic
It closes thickener, stop remaining spoil disposal；Pit level is reduced to when Hmin after concentration or timing node has arrived 12:00,22:00
When, restore the operation of thickener according to digester inputiing mud volume, restores remaining spoil disposal；
When restoring thickener work for the first time, pit level is H after concentration1, the thickener available machine time is denoted as t1, next concentration
After-bay control timing node 8:00 or 18:00 are denoted as t2, then pit level increasing value Δ H=after being concentrated per hour after thickener is opened
(Hmax-H1)/(t2-t1), concentration after-bay increases inputiing mud volume Δ Q=Δ H* concentration after-bay sectional area=(Hmax-H per hour1)/
(t2-t1) * concentration after-bay sectional area；
Then total practical just heavy sludge volume is adjusted to QJust=∑ Qi/(∑Qi+∑Qs)*(ΔQ+QDigestion), the reality of single primary sedimentation tank is just
Heavy sludge volume Qi=Qi/∑Qi*QJust；Total real surplus sludge volume QIt is surplus=∑ Qs/(∑Qi+∑Qs)*(ΔQ+QDigestion), it is single raw
The corresponding real surplus sludge volume Q in object ponds=Qs/∑Qs*QIt is surplus；
According to digester inputiing mud volume QDigestion=QDense after-bayΔ Q=QFirst 1+QResidue 1, acquire thickener mud volume QResidue 1；QFirst 1、QResidue 1、QDense after-bay
Respectively first heavy sludge volume, thickener mud volume, concentration after-bay inputiing mud volume；
Pit level changes after the primary concentration of judgement per hour, adjusts just heavy sludge volume and remaining sludge volume as procedure described above.
8. the accurate sludge discharging method of sewage treatment according to claim 7, which is characterized in that the Liquid level model of after-bay is concentrated
Enclosing Hmin~Hmax is 1.7~3.4m.
9. the accurate sludge discharging method of sewage treatment according to claim 7, which is characterized in that the adjustment of the inputiing mud volume of thickener
Mode are as follows:
According to QDense after-bay*MLSSDense after-bay=QResidue 1*MLSSResidue 1+∑(Qi*MLSSi), MLSS can be obtainedResidue 1, according to MLSSResidue 1It adjusts dense
Contracting machine mud volume；Wherein QDense after-bayFor after-bay inputiing mud volume, MLSS is concentratedDense after-bayFor after-bay sludge concentration, Q is concentratedResidue 1Go out for thickener
Mud amount, MLSSResidue 1For thickener mud extraction concentration.
QResidue 1*MLSSResidue 1=QResidue 2*MLSSResidue 2, QResidue 2、MLSSResidue 2The respectively total inputiing mud volume of thickener and thickener is into dirt mud
Concentration；The total inputiing mud volume of thickener per hour is acquired according to solid conservation, in conjunction with thickener processing capacity, determines that thickener opens platform
Number.
10. the accurate sludge discharging method of sewage treatment according to claim 5, which is characterized in that pass through what is be arranged in outlet canal
Be discharged TP and TN on-line detector obtain water outlet TP and TN value, by the COD on-line detector being arranged in intake pool obtain into
Water COD concentration adjusts total first heavy sludge volume according to inlet COD concentration value and the value of water outlet TP and TN:
When inlet COD concentration value is lower than 200mg/L, and continues 6h or more, suspends just mattress sinking mud, be changed to continuously be vented spoil disposal；
Every 2h judge water outlet TP and TN variation, when water outlet TP or TN value there is continuous rise trend, then reduce just mattress sinking
Dredge pump group frequency converter frequency, to reduce total first heavy sludge volume, until water outlet TP, TN restore normally, adjustment mode are as follows:
When water outlet TP rises to 0.25mg/L or TN and rises to 12mg/L, then total first heavy sludge volume be reduced to original two/
One；When water outlet TP rises to 0.35mg/L or TN and rises to 13mg/L, then total first heavy sludge volume be reduced to original two/
One；14mg/L is risen to when water outlet TP rises to 0.40mg/L or TN, suspends just mattress sinking mud, is changed to emptying spoil disposal；
When primary sedimentation tank mud scraper electric current continue it is higher to mud scraper safe operation maximum current 95% when, if effluent quality is just
Often, system increases just heavy sludge volume by increasing first mattress sinking dredge pump group frequency converter frequency, guarantees mud scraper operational safety；If going out
Water water quality is higher, then primary sedimentation tank is changed to emptying spoil disposal, guarantees mud scraper operational safety；
Wherein, the priority of mud scraper current regulation lower than water outlet TP and TN regulation priority, i.e., preferentially according to water outlet TP and
The value of TN regulates and controls total first heavy sludge volume, and then regulates and controls total first heavy sludge volume according to primary sedimentation tank mud scraper electric current.
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