CN103991954A - Energy-saving and consumption reduction method for sewage treatment plant - Google Patents
Energy-saving and consumption reduction method for sewage treatment plant Download PDFInfo
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- CN103991954A CN103991954A CN201410192388.XA CN201410192388A CN103991954A CN 103991954 A CN103991954 A CN 103991954A CN 201410192388 A CN201410192388 A CN 201410192388A CN 103991954 A CN103991954 A CN 103991954A
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- sludge
- sludge bulking
- bulking
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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
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- Activated Sludge Processes (AREA)
Abstract
The invention relates to an energy-saving and consumption reduction method for a sewage treatment plant. Field investigation and test are carried out on a sewage treatment plant where sludge bulking happens. Reasons for sludge bulking are analyzed, and regulation experiments are carried out for verification. Under other normal influence conditions of sludge bulking, aeration rate is minimized, concentration of dissolved oxygen in an aeration tank is maintained to 1.2-1.5mg/L, appropriate increasing of filamentous bacteria is promoted artificially, SVI is maintained between 200 and 300, slight expansion occurs to sludge, and hydraulic retention time of a secondary sedimentation tank is prolonged or precipitation efficiency is raised by measures such as inclined plate precipitation and the like. Meanwhile, sludge reflux ratio is increased, sludge loss is controlled, it is guaranteed that effluent quality reaches the standard, and energy conservation and consumption reduction are realized. The method has advantages of small investment and simple operation.
Description
Technical field
The present invention relates to technical field of sewage, the energy-saving and cost-reducing method of especially a kind of sewage work.
Background technology
Sludge bulking is ubiquitous problem in the activated sludge process of sewage disposal, even in the intermittent aeration pond that is considered to be difficult for expanding most, also happens occasionally.Once there is serious sludge bulking by the effluent quality of the whole sewage work of impact in Sewage treatment systems, and restive at short notice, jeopardize the normal operation of whole sewage work, even can make a complete set of system crash, and cause huge financial loss.At present the research emphasis of this respect is mainly concentrated on taking cotton-shaped active sludge as study subject, investigate mechanism, Control Measures measure that sludge bulking occurs.
The reason that causes sludge bulking generation is many-sided, aeration deficiency is one of them, and the production restoration that will make the sewage work that sludge bulking has occurred normally often needs excessive aeration, the expenses such as the power that aeration produces account for very large proportion in the overall running cost of sewage work, and this just causes certain waste.
Summary of the invention
The object of the invention is to utilize the not enough mud generation microdilatancy producing of aeration, ensureing under the prerequisite that effluent quality is up to standard and mud does not run off in a large number, to realize the energy-saving and cost-reducing of sewage work.
The technical solution adopted for the present invention to solve the technical problems is:
(1) sewage work that sludge bulking occurs is carried out on the-spot investigation and test, analyze the reason that causes sludge bulking;
(2) regulate and control experimental study, the conclusion of the initiation sludge bulking drawing in checking (1);
(3) in the normal situation of sludge bulking other influences condition, reduce aeration rate, maintain the concentration of dissolved oxygen in aeration tank at 1.2-1.5mg/L, people is for impelling thread fungus to increase in right amount, and SVI remains between 200～300, makes mud generation microdilatancy.
(4) further, increase the hydraulic detention time of second pond or adopt sloping plate deposition measure to improve deposition efficiency, increasing return sludge ratio simultaneously, controlling sludge loss, ensureing that effluent quality is up to standard.
Further, the groundwork of step (1) comprising:
1. the investigation having problems in project profile, technical process, production etc.;
2. the test of Inlet and outlet water water quality index of correlation;
3. the detection analysis of aeration tank mixed solution mud;
4. by analytical test result, tentatively draw the conclusion that causes sludge bulking.
Further, step (2) comprising:
1. propose regulation and control scheme, simulate former factory treatment process or experimental verification is carried out in production scene;
2. experimental result is analyzed, summed up, confirm to cause the reason of sludge bulking;
3. draw and control the measure of sludge bulking and effectively control sludge bulking.
Preferably, Inlet and outlet water water quality index of correlation comprises sludge index, chemical oxygen demand (COD), nitrogen, phosphorus, nutritive element ratio, pH value, dissolved oxygen, sulfide, mixed solution thread fungus biology etc.
The invention has the beneficial effects as follows: by inquiry, experiment, analyze there is the reason of sludge bulking and taken measures to carry out Effective Regulation, in the normal situation of sludge bulking other influences condition, reduce aeration rate, mud generation microdilatancy and do not reduce sewage disposal plant effluent water quality reaching standard, realizes energy-saving and cost-reducing.This invention less investment, easy to operate.
Brief description of the drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is aeration tank sludge index figure of the present invention,
Fig. 2 is the former water of the present invention, the variation diagram of water outlet COD in one week,
Fig. 3 be in the former water of the present invention nitrogen containing spirogram,
Fig. 4 be in the former water of the present invention total phosphorus containing spirogram,
Fig. 5 is the concentration map of dissolved oxygen in Aerobic Pond of the present invention,
Fig. 6 is the former water of the present invention, the variation diagram of water outlet sulfide in one week,
Fig. 7 is testing apparatus schematic diagram of the present invention,
Fig. 8 is the changing trend diagram of SVI of the present invention and COD clearance,
Fig. 9 is sludge loading of the present invention while being 0.25kgCOD/ (kgMLSSd), DO=1.5mg/L, the graph of a relation of SVI and time,
Figure 10 is sludge loading of the present invention while being 0.25kgCOD/ (kgMLSSd), DO=2.0mg/L, the graph of a relation of SVI and time,
Figure 11 is the COD clearance changing conditions figure of sludge loading of the present invention while being 0.25kgCOD/ (kgMLSSd),
Figure 12 is the removal effect figure of DO concentration of the present invention nitrogen, phosphorus while being 1.5mg/L.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, and basic structure of the present invention is only described in a schematic way, and therefore it only shows the formation relevant with the present invention.
Embodiment
1, on the-spot investigation and test
Southern Jiangsu town A/O process spent water treatment plant's day is processed 1.5 ten thousand tons of composite wastewaters, and this factory builds up for 2003, moves substantially well, but the phenomenon of sludge bulking happens occasionally.
(1) sludge index
The sludge index of METHOD FOR CONTINUOUS DETERMINATION aeration tank one week, result as shown in Figure 1.Can find out, the sludge index of aeration tank all, more than 200mL/g, illustrates that sludge bulking has occurred this Sewage Plant.
(2) chemical oxygen demand (COD) (COD)
The former water of equalizing tank and the second pond water outlet that get respectively at one time this Sewage Plant continuous one week every day, detect its chemical oxygen demand (COD) (COD), and result as shown in Figure 2.The COD of the former water of visible this Sewage Plant is between 800～1400mg/L, and COD is between 50m～150mg/L in second pond water outlet, and when the concentration of water outlet COD is during lower than 60mg/L, the emission standard that meets urban wastewater treatment firm and priority industry industry can directly be discharged.
(3) nitrogen, phosphorus
Continuous one week at one time the former water of Qu Gai factory detect the changing conditions of its ammonia nitrogen, total nitrogen and total phosphorus, as shown in Figure 3 and Figure 4, show that the content of total nitrogen in the handled water inlet of this factory is between 150～190mg/L, the content of ammonia nitrogen is in 40mg/L left and right, and the content of phosphorus is between 3～5mg/L.
(4) nutritive element ratio
Measure BOD in former water
5value (in table 1), the nutritive substance that judges this sewage work's waste water is than whether meeting microbial growth demand.
Nutritive element in the former water of table 1 is than table
The content of former water mesophytization oxygen requirement (BOD5) is between 150～200mg/L as can be seen from Table 1, and nutritive ingredient ratio can not meet BOD
5: the requirement of N:P=100:5:1, the phenomenon that exists carbon source and phosphorus nutrition to lack.(5)pH
The pH of raw wastewater is 7～9, and the pH measuring in Aerobic Pond is 7～8, substantially in neutral state, it has been generally acknowledged that the biochemical property of mud in the time that aeration tank pH value is 6.5～8.0 is good.
(6) dissolved oxygen (DO)
Dissolved oxygen to Aerobic Pond is measured, and result as shown in Figure 5.Dissolved oxygen concentration in Aerobic Pond is all more than 3.0mg/L.In the process of Wastewater Treated by Activated Sludge Process waste water, it has been generally acknowledged that the normal growth needs that can maintain active sludge microorganism when the dissolved oxygen in mixed solution in the time that 2.0mg/L is above.
(7) sulfide
Sulfide mainly comprises acid soluble metal sulfide, deliquescent H
2s, HS
-, S
2-, organic sulfide and insoluble sulfide.The former water of continuous detecting and second pond go out the content one week of Sulfide in water, and result as shown in Figure 6, therefrom can find out that the sulfide content in this sewage work's waste water is approximately 40mg/L, and the sulfide content of water outlet is between 1.5～2mg/L.For whether the sulfide content of further verifying this Sewage Plant is enough to cause sludge bulking, need in conjunction with observing its sludge organism phase.
(8) mixed solution thread fungus biophase
From the aeration tank of this sewage work, get mixed solution sample, thread fungus is observed, choose the colony that wherein accounts for main advantage and record and contrast Eikelboom sorted table, can find out that the advantage phycomycetes in this sewage disposal plant aeration tank active sludge has Sphaerotilus natans, microfilament bacterium and Nocardia bacteria.
Can tentatively judge that in conjunction with the measurement result of each index above the reason that sludge bulking occurs in this sewage work is the nutritive ingredient imbalance of raw wastewater, carbon source and phosphorus nutrition lack.
2, sludge bulking regulation and control and energy-saving and cost-reducing
The treatment process facility of simulated sewage treatment plant, a set of experimental installation is built in contracting, as Fig. 7.Test former water and derive from this sewage treatment plant inflow mouth, returned sluge is taken from the returned sluge pipeline of this factory, and the water of experimental installation aeration tank is taken from sewage disposal plant aeration tank stage casing.Through the test run(s) of two weeks, the data in water outlet and sludge index and Fig. 1, Fig. 2 approached.
In experimentation, keep other operating parameter constant, adopt the nutritive medium of glucose and potassium primary phosphate preparation as the supplementary liquid of carbon source and phosphorus nutrition element, nutritive proportion is approached: C:N:P=100:5:1.Measure the clearance of SVI and COD, observe the changing conditions of bulking sludge.Fig. 8 is SVI and COD clearance trend map over time.Can find out, by adding nutritional supplementation liquid, sludge bulking is under control gradually, through steady running after a while, the value of sludge index SVI drops to 192mL/g, this has determined that it is to cause that the reason of sludge bulking occurs in this sewage work that nutrition lacks, add nutritive substance and can make the mud expanding improve, and in whole process the clearance of COD all more than 80%.
Further, the impact on sludge bulking when investigating respectively dissolved oxygen concentration be 1.5mg/L and 2.0mg/L under the condition of sludge bulking basic controlling, experimental result is as Fig. 9, Figure 10.Can find out, in the time that sludge loading is 0.25kgCOD/ (kgMLSSd), DO=1.5mg/L, sludge index is in 250mL/g left and right, and in the time that increase dissolved oxygen concentration is 2.0mg/L, sludge index slowly reduces.
The system of investigating in two processes is to organic removal situation, and as shown in figure 11, result shows under low load condition, and when dissolved oxygen solubility is lower while being 1.5mg/L, the concentration of water outlet COD is 320mg/L left and right; When dissolved oxygen concentration increases to 2mg/L, the density loss of water outlet COD is 170mg/L left and right.
When reactor DO concentration is 1.5mg/L, when influent ammonium concentration remains on 35～45mg/L, Sludge System still can keep higher nitrification efficiency, and average ammonia nitrogen removal frank can reach more than 85%, as shown in figure 12.
Preferably, maintain aeration tank dissolved oxygen at 1.5mg/L, mud keeps microdilatancy state, and second pond adopts sloping plate deposition measure to improve deposition efficiency, increases return sludge ratio simultaneously, controls sludge loss, ensures that effluent quality is up to standard.
Mass transfer formula according to oxygen in liquid calculates that this treatment plant aeration tank maintains respectively that dissolved oxygen is 4.0,3.0,2.5,2.0, air demand (the results are shown in Table 2) when 1.5mg/L.
Air feed scale under table 2 different dissolved oxygen conditions
As can be seen from Table 2, the dissolved oxygen maintaining in aeration tank is that the needed air demand of 3.0mg/L Shi Gai factory is 1.39 × 10
5m
3/ d; And the dissolved oxygen maintaining in aeration tank is that the needed air demand of 1.5mg/L Shi Gai sewage work is 1.12 × 10
5m
3/ d, has saved 19.4% relatively, calculates by current Jiangsu electricity price for industrial uses, can save every year approximately 20.5 ten thousand yuan, and economic benefit is comparatively remarkable.
Taking above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, relevant staff can, not departing from the scope of this invention technological thought, carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification sheets, must determine its technical scope according to claim scope.
Claims (2)
1. the energy-saving and cost-reducing method of sewage work, is characterized in that, it is implemented in accordance with the following steps:
(1) sewage work that sludge bulking occurs is carried out on the-spot investigation and test, analyze the reason that causes sludge bulking;
(2) regulate and control experimental study, the conclusion of the initiation sludge bulking drawing in checking (1);
(3) in the normal situation of sludge bulking other influences condition, reduce aeration rate, maintain the concentration of dissolved oxygen in aeration tank at 1.2-1.5mg/L, people is for impelling thread fungus to increase in right amount, and SVI remains between 200～300, makes mud generation microdilatancy;
(4) further, the measure such as hydraulic detention time or employing sloping plate deposition that increases second pond improves deposition efficiency, increases return sludge ratio simultaneously, controls sludge loss, ensures that effluent quality is up to standard, and realize and saving energy and reduce the cost,
Further, the groundwork of step (1) comprising:
1. the investigation having problems in project profile, technical process, production etc.;
2. the test of Inlet and outlet water water quality index of correlation;
3. the detection analysis of aeration tank mixed solution mud;
4. by analytical test result, tentatively draw the conclusion that causes sludge bulking,
Further, step (2) comprising:
1. propose regulation and control scheme, simulate former factory treatment process or experimental verification is carried out in production scene;
2. experimental result is analyzed, summed up, confirm to cause the reason of sludge bulking;
3. draw and control the measure of sludge bulking and effectively control sludge bulking.
2. the energy-saving and cost-reducing method of a kind of sewage work as claimed in claim 1, is characterized in that: Inlet and outlet water water quality index of correlation comprises sludge index, chemical oxygen demand (COD), nitrogen, phosphorus, nutritive element ratio, pH value, dissolved oxygen, sulfide, mixed solution thread fungus biology etc.
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| CN201410192388.XA CN103991954A (en) | 2014-05-08 | 2014-05-08 | Energy-saving and consumption reduction method for sewage treatment plant |
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|---|---|---|---|
| CN201410192388.XA CN103991954A (en) | 2014-05-08 | 2014-05-08 | Energy-saving and consumption reduction method for sewage treatment plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111099728A (en) * | 2020-01-17 | 2020-05-05 | 北京工业大学 | Method for starting micro-expansion of shortcut nitrification sludge under condition of low carbon-nitrogen ratio domestic sewage |
| CN112978907A (en) * | 2021-02-09 | 2021-06-18 | 北京工业大学 | Device and method for quickly starting filamentous bacterium sludge expansion under low-temperature condition |
-
2014
- 2014-05-08 CN CN201410192388.XA patent/CN103991954A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111099728A (en) * | 2020-01-17 | 2020-05-05 | 北京工业大学 | Method for starting micro-expansion of shortcut nitrification sludge under condition of low carbon-nitrogen ratio domestic sewage |
| CN112978907A (en) * | 2021-02-09 | 2021-06-18 | 北京工业大学 | Device and method for quickly starting filamentous bacterium sludge expansion under low-temperature condition |
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Application publication date: 20140820 |