CN1334251A - Process for treating waste water with coal ash - Google Patents
Process for treating waste water with coal ash Download PDFInfo
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- CN1334251A CN1334251A CN 01126600 CN01126600A CN1334251A CN 1334251 A CN1334251 A CN 1334251A CN 01126600 CN01126600 CN 01126600 CN 01126600 A CN01126600 A CN 01126600A CN 1334251 A CN1334251 A CN 1334251A
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- waste water
- aeration tank
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- coal ash
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Abstract
A process for treating waste water containing coal ash generated by flushing coal includes collecting said waste water in deposition pool, depositing, introducing the supernatant into neutralizing and aerating pool, adding 5-15% waste sulfuric acid for acidifying it, adding alkaline calcium carbide dreg liquid for neutralizing and aerating it, adding 10% sodium hypochlorite for disinfecting it, filtering and discharge. Its advantages are high effect and saving water.
Description
Technical field
The present invention relates to the coal is the power station sewage disposal of fuel, more specifically refers to a kind of process for treating waste water with coal ash.
Background technology
As everyone knows, the pollution of shortage of water resources and efflux wastewater has now become worldwide problem, and has caused the universe's attention.Although many work have been done by China aspect water prevention and cure of pollution, law, the rules of relevant water are issued execution in succession, and China's water pollution problems is still relatively more serious.According to the preliminary statistics, the whole nation has 70% waste water unprocessed and directly be disposed to river, river, lake, sea approximately, makes some water resourcess be subjected to severe contamination, so that has lost due use value, causes available water resources to reduce.
In the power station of developed country water utilities management process, the water system of power plant is all considered by the principle of utilizing again after the using in proper order, recycle and handle of water, to reduce total industrial water consumption and efflux wastewater amount, have in addition reach waste water zero emission.
Ore fuel power station is the water rich and influential family, and from economical operation and protection environment, water saving and minimizing efflux wastewater all seem very necessary and important.
With the coal-burning power plant is example, only just to the cleaning wash water (calling in the following text) of coal transporting trestle systematic building thing towards coal waste water be suspension content up to 30000mg/L and above coal ash waste water, contain dashing coal contaminated wastewater environment and being convenient to reclaim fine-dusty coal of a large amount of coal dust grains here for anti-.At present power plant's coal waste water treatment process that liquidates all uses slurry pond is set.Adopt traditional two-stage precipitation treatment process, make after treatment " clear liquid " be disposed to water drain by overflowing certainly.
But owing in coal waste water, contain a large amount of very tiny suspended particles (ickings), though the suspension content of and draining settlement separate through 24 hours～48 hours is generally still at 3000～4000mg/L, sometimes even higher, exceeded the emission standard that stipulate in country and Shanghai City greatly.If adopt conventional flocculation-clarification or flocculation-clarification-technologies such as filtration but big because of floor space, the technical feasibility difference and exist secondary pollution with reclaiming fine-dusty coal quilt negative.
Here it is, and China do not have coal-burning power plant's slurry pond draining ubiquity of Wastewater Concentrated system and press for the problem of solution.
Summary of the invention
At the problem that the coal-burning power plant of above-mentioned no Wastewater Concentrated system exists process for treating waste water with coal ash, the present invention proposes a kind of brand-new process for treating waste water with coal ash.
In order to address the above problem, process for treating waste water with coal ash of the present invention may further comprise the steps;
A will come together in towards coal waste water and carry out preliminary sedimentation in the coal slime pond;
B is in will the waste water behind preliminary sedimentation sending into and in the aeration tank;
C, in and drop into earlier in the aeration tank concentration be 5-15% sulfur waste acid in and waste water in the aeration tank carry out acidification;
D handles with aeration with in carrying out in the alkaline electro rock ballast liquid input and the aeration tank again;
E drops into concentration and is 10% clorox and carries out germicidal treatment in the aeration tank;
F filters the back discharging once more.
Among the described step c, make the pH value of the waste water after acidification in the aeration tank be controlled at 2.5 ± 0.5; In the described steps d, in the waste water in the aeration tank is carried out and in the aeration processing; The pH value of the waste water after it is neutralized is 7-9.Among the described step e, when the waste water in the aeration tank is carried out germicidal treatment, in the ratio of the waste water in clorox and the aeration tank 1 to 1000 ratio input.
When carrying out acidification, the waste water in the aeration tank is stirred, its reaction times was controlled at 10-15 minute; Underway and when handling, the waste water in the aeration tank is continued to stir, its reaction times was controlled at 5-15 minute; When carrying out germicidal treatment, the waste water in the aeration tank is continued to stir again, make its reaction times be controlled at half an hour approximately.
Among the described step f, when filtering, the mode that waste water is risen to employing membrane filtration in the membrane filter is filtered.
The process of described membrane filtration is followed successively by strainer feed liquor, waste water filtering, strainer and carries out back flushing, filter cake sedimentation, strainer operation circulation, deslagging.
Behind the above-mentioned method of wastewater treatment of the present invention, will reach 99.7% towards the suspended substance removal rate in the coal waste water, organic removal rate reaches 99.5%; In the waste water of being discharged, suspended substance mean value only is 25mg/L, and organism mean value only is 79.5mg/L, pH value average out to about 7.7, and its index all reaches or is lower than the existing emission standard in country and Shanghai City.This treatment process has not only solved the qualified discharge problem of coal-fired power plant's coal mud water, can also realize the purpose of drainage water reuse, has saved the consumption of power plant's service water; In whole wastewater treatment process, suited measures to local conditions to reach the comprehensive regulation purpose of " treatment of wastes with processes of wastes against one another "
Description of drawings
Fig. 1 is by adopted the treatment system synoptic diagram according to the inventive method.
The specific embodiment
Process for treating waste water with coal ash of the present invention may further comprise the steps;
A will rush coal waste water and come together in and carry out preliminary sedimentation in the coal slime pond;
B is during the waste water behind preliminary sedimentation sent into and in the aeration tank;
C, in and the aeration tank in drop into earlier concentration be 5-15% Waste Sulfuric Acid in and the aeration tank in waste water carry out acidification:
D is in dropping into alkaline electro rock ballast liquid and in carrying out in the aeration tank and Air Exposure again;
E drops into concentration in the aeration tank and is 10% clorox and carries out sterilization processing;
F, discharging after again filtering.
Among the described step c, the pH value of the waste water after acidification in the aeration tank is controlled at 2.5 ± 0.5;
In the described steps d, in the waste water in the aeration tank is carried out and in the Air Exposure; Make its neutralization After the pH value of waste water be 7-9.
Among the described step e, when the waste water in the aeration tank is carried out sterilization processing, press clorox with The ratio of the waste water in the aeration tank is 1 to 1000 ratio input.
When carrying out acidification, the waste water in the aeration tank is stirred, make its reaction time control At 10-15 minute;
Underway and when processing, the waste water in the aeration tank is continued to stir, make its reaction time control At 5-15 minute;
When carrying out sterilization processing, the waste water in the aeration tank is continued to stir again, make its reaction time control Built in about half an hour.
Among the described step f, when filtering, waste water lifting is adopted the membrane type mistake in membrane filter The mode of filter is filtered.
The process of described membrane filtration is followed successively by filter feed liquor, waste water filtering, filter and carries out instead Flushing, filter cake sedimentation, filter operation circulation, deslagging.
Embodiment
Please in conjunction with shown in Figure 1, coal handling system will rush coal waste water (flushing water) and come together in through the open drain In the ad hoc coal slime pond, hold back earlier the ickings of larger particles through preliminary sedimentation tank 3, very promote water to prevent card Pump. Behind preliminary sedimentation, contain in a large number fine particle rush coal waste water enter in and aeration tank 4 in, When reaching certain high water level, ad hoc magnetic turning column liquid level meter sends alarm signal, manually makes up a prescription, throws Medicine, compressed air stir. In in and drop into earlier the Waste Sulfuric Acid of 10% concentration, (this in the aeration tank 4 The spent acid that adopts upper steel five factory's pickled plates to discharge in the experiment of invention), because containing a large amount of iron in the spent acid Ion, reaching " flocculation " effect, general dosing terminal point with control pond water ph value reach 2.5 (in The sunk PH transmitter and the PH that are provided with ultrasonic cleaning equipment with the aeration tank show) stirring reaction 10 Minute. Then by calcium carbide slag bath 1 drop into alkaline electro rock ballast liquid in and in the aeration tank 4, with neutralizing acid The property Chi Shui, general control pond water PH is 8.5, continue to stir the aeration rate of whole process 10 minutes Control range is 8～10L/sm2 Drop into 10% NaClO (quite in 1/1000 ratio at last The water free chlorine is about 0.8～1.3mg/L) in the pond, and again through approximately halfhour stirring, the artificial unlatching promotes water Pump 5 is sent the coal waste water that rushes after " flocculation, neutralization, organic substance decomposing sterilization " processed into the membrane type mistake Filter carries out filtration treatment. When in and aeration tank 4 when reaching low liquid level, liquid level gauge sends signal alarm. When being lower than liquid level, liquid level gauge sends signal, automatically stops transport to promote water pump, and filter is also automatic simultaneously Stop transport. Label 2 is roots blower among Fig. 1, its effect be in and aeration tank 4 and calcium carbide slag bath 1 Source of the gas is provided.
During membrane filtration, lifting water pump 5 will rush coal waste water and send into membrane filter, and will be in a large number solid in the waste water The film surface that the body particle is blocked on filter bag forms filter cake, when filter cake reach that the certain thickness resistance increases and When affecting the rate of filtration, filter enters the backwash state automatically. At this moment, filter cake hightails the film table Face is deposited to the filter conical lower portion. When the sediment in the conical bottom runs up to when a certain amount of conical lower portion Slag-discharging valve is opened automatically, and sediment (filter cake) is drained into slag bucket 6, delivers to coal yard.
When filtering, because the particle saturation of microfiltration film is little, the cycle of operation of filter is impossible Very long, generally debug phase setting value is 200s in the early stage, its setting value of normal operating phase 300s～Between the 500s.
Filter cake reaches certain thickness on filter element, when pressure reduction △ P reaches certain value, automatically enters recoil Wash. 2 numerical value are depended in the backwash end, the one, and clear water zone liquid level in chamber on the filter; The secondth, establish Fixed maximum backwash lasts.
When the filter cycle of operation reached 4 cycles, then the bottom residual cake valve was opened automatically, to effluxing Slag. Filter enters next circulation and namely reaches 4 cycles of operation outside deslagging again.
The whole filtration of filter, recoil, tapping process all adopt computer controlled automatic. Filter Device is provided with special-purpose controller, have on it that timing demonstration, error message show, setting value adjust key with And relevant operated key is for manually-operated.
Table 1 and table 2 have been listed in above-described embodiment, 2 the typical test results of coal ash wastewater treatment in actual motion:
Table 1
| Project | Unit | Design load | Measured value | GB GB8978-96 | Shanghai town-brand DBJ08-904-98 | ||
| Water inlet | Water outlet | Water inlet | Water outlet | ||||
| PH value | 7～8 | 6～9 | 7.78 | 7.63 | 6～9 | 6～9 | |
| Suspension | mg/L | ＜30000 | 50 | 9423 | 25 | Primary standard: 70 secondary standards: 200 | 200 |
| Cod codcr | mg/L | 16775.0 | 79.5 | Primary standard: 100 secondary standards: 150 | 300 | ||
| Oil | mg/L | 7.535 | 0.415 | ||||
Annotate:
1. the numerical value in the measured value hurdle is mean value;
2. measuring unit: willow Pu, Shanghai district environmental monitoring station;
3. the cycle filtration time is 500Sec.
Table 2 membrane filter effluent quality
Influent quality is: CODcr (2h)=6869.0mg/L; SS=3500NTU
Annotate:
1.COD test mode is with reference to " People's Republic of China's power industry water, vapour test method rules ".
The cycle filtration time be 300s, sample thief 1.#30s、②
#90s、③
#150s、④
#210s、⑤270
#
s。
3. measuring unit: willow Pudong Development Bank operation section of power plant of Shanghai Electric Power limited company.
Above-mentioned experiment shows:
Utilize the inventive method obtained removal efficiency reach 99.7%, organic removal rate reaches 99.5% The result. It is 25mg/L that Waste Water Treatment goes out aqueous suspension mean value, organic matter mean value (with CODcr represents) be 79.5mg/L, pH value average out to about 7.7. More than three indexs all reach or Be lower than the existing discharge standard in country and Shanghai City.
In the membrane filtration, its filter is owing to adopt porous hydrophilic polytetrafluoroethylene (PTFE) (PTFE) filter membrane, Have stable chemical nature, low, the heatproof, ageing-resistant of coefficient of friction. The filter membrane pore diameter range generally 0.1～10 μ m determine according to waste water suspension granular size, apportionment ratio and character. Utilize microfiltration membranes to show Face filters, and makes suspended particulate in the liquid all be collected in the surface of filter membrane, is at present more solid The liquid separation equipment.
The use of process for treating waste water with coal ash has not only solved the qualified discharge of coal-fired power plant's coal mud water Problem can also realize the purpose of drainage water reuse, has saved the consumption of power plant's industry water. Whole useless Suit measures to local conditions in the water treatment procedure, the medicine of consumption is with other industrial wastes (Waste Sulfuric Acid and carbide slag) Be main, reached the comprehensive regulation purpose of " treatment of wastes with processes of wastes against one another ", the waste residue that filter is discharged (contains big Measure the duff grain) but return combustion, whole processing technological flow non-secondary pollution. Can push away in the coal-burning power plant The wide application has certain economy and environmental benefit.
In the membrane filter, adopt low pressure, high throughput to filter and reach primary purification, and have operation Temperature range is wide, power consumption is low, noise is little, take up an area province, easy to remove dirt, be convenient to the advantage such as automatically control.
Prove coal ash of the present invention wastewater treatment side through nearly four months debugging and actual motion data Method and treatment system the rushing in processing willow Pudong Development Bank, Shanghai City Coal Transportation System of building according to method The application of coal waste water aspect is successful, has reason to believe, process for treating waste water with coal ash is being processed generating The containing coal waste water aspect and also can achieve the desired result of factory's coal yard drainage system against rain.
In sum, process for treating waste water with coal ash of the present invention be in the present field of waste water treatment first Adopt, not only solved the qualified discharge of coal ash waste water, realized the purpose of drainage water reuse, simultaneously In whole processing method, accomplished again the comprehensive regulation of " waste recycling ". In whole treatment of process streams Non-secondary pollution in the journey, this also is that other method of wastewater treatment can not be compared.
Claims (5)
1, a kind of process for treating waste water with coal ash is characterized in that: this treatment process may further comprise the steps;
A will come together in towards coal waste water and carry out preliminary sedimentation in the coal slime pond;
B is in will the waste water behind preliminary sedimentation sending into and in the aeration tank;
C, in and drop into earlier in the aeration tank concentration be 5-15% sulfur waste acid in and waste water in the aeration tank carry out acidification;
D handles with aeration with in carrying out in the alkaline electro rock ballast liquid input and the aeration tank again;
E drops into concentration and is 10% clorox and carries out germicidal treatment in the aeration tank;
F filters the back discharging once more.
2, process for treating waste water with coal ash as claimed in claim 1 is characterized in that:
Among the described step c, make the pH value of the waste water after acidification in the aeration tank be controlled at 2.5 ± 0.5;
In the described steps d, in the waste water in the aeration tank is carried out and in the aeration processing; The pH value of the waste water after it is neutralized is 7-9;
Among the described step e, when the waste water in the aeration tank is carried out germicidal treatment, in the ratio of the waste water in clorox and the aeration tank 1 to 1000 ratio input.
3, process for treating waste water with coal ash as claimed in claim 2 is characterized in that:
When carrying out acidification, the waste water in the aeration tank is stirred, its reaction times was controlled at 10-15 minute;
Underway and when handling, the waste water in the aeration tank is continued to stir, its reaction times was controlled at 5-15 minute;
When carrying out germicidal treatment, the waste water in the aeration tank is continued to stir again, make its reaction times be controlled at half an hour approximately.
4, process for treating waste water with coal ash as claimed in claim 1 is characterized in that:
Among the described step f, when filtering, the mode that waste water is risen to employing membrane filtration in the membrane filter is filtered.
5, process for treating waste water with coal ash as claimed in claim 4 is characterized in that:
The process of described membrane filtration is followed successively by strainer feed liquor, waste water filtering, strainer and carries out back flushing, filter cake sedimentation, strainer operation circulation, deslagging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01126600 CN1334251A (en) | 2001-08-31 | 2001-08-31 | Process for treating waste water with coal ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01126600 CN1334251A (en) | 2001-08-31 | 2001-08-31 | Process for treating waste water with coal ash |
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| Publication Number | Publication Date |
|---|---|
| CN1334251A true CN1334251A (en) | 2002-02-06 |
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ID=4666612
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|---|---|---|---|
| CN 01126600 Pending CN1334251A (en) | 2001-08-31 | 2001-08-31 | Process for treating waste water with coal ash |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417261A (en) * | 2011-10-14 | 2012-04-18 | 大连理工大学 | Method for treating coal bed gas produced water by combining pre-oxidation aerated oxidation with capacitive deionization |
| CN106830440A (en) * | 2017-03-21 | 2017-06-13 | 西安西热水务环保有限公司 | A kind of thermal power plant's high-salt wastewater dish tubular membrane concentrating and treating system and method |
| CN111417597A (en) * | 2017-11-20 | 2020-07-14 | Ihi 运搬机械株式会社 | Water treatment method and apparatus |
-
2001
- 2001-08-31 CN CN 01126600 patent/CN1334251A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417261A (en) * | 2011-10-14 | 2012-04-18 | 大连理工大学 | Method for treating coal bed gas produced water by combining pre-oxidation aerated oxidation with capacitive deionization |
| CN106830440A (en) * | 2017-03-21 | 2017-06-13 | 西安西热水务环保有限公司 | A kind of thermal power plant's high-salt wastewater dish tubular membrane concentrating and treating system and method |
| CN111417597A (en) * | 2017-11-20 | 2020-07-14 | Ihi 运搬机械株式会社 | Water treatment method and apparatus |
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| WD01 | Invention patent application deemed withdrawn after publication |