CN101613159A - The treatment process of waste circulating cooling water in heat-engine plant - Google Patents
The treatment process of waste circulating cooling water in heat-engine plant Download PDFInfo
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- CN101613159A CN101613159A CN200910104570A CN200910104570A CN101613159A CN 101613159 A CN101613159 A CN 101613159A CN 200910104570 A CN200910104570 A CN 200910104570A CN 200910104570 A CN200910104570 A CN 200910104570A CN 101613159 A CN101613159 A CN 101613159A
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Abstract
The invention discloses a kind of treatment process of waste circulating cooling water in heat-engine plant, comprise coagulating sedimentation, filtration and ion exchange treatment step, in the described filtration step, adopt the filter post to filter, be filled with from top to bottom anthracite coal measure and rare earth porcelain layer of sand in the filter post, wherein the height of anthracite coal measure is 500～600mm, and the height of rare earth porcelain layer of sand is 500～600mm; When the filter post filtered, the flow velocity of liquid was 6～18m/h.The present invention adopts the double-deck homogeneous filtering material of hard coal-rare earth porcelain sand to filter can remove most suspended substances, and the Weak-acid cation exchange process can be removed most of basicity and hardness.Thermal power plant's circulation cooling sewer is handled in two technology couplings, effluent quality can satisfy the reuse requirement fully, and, filter post of the present invention is applicable to the waste water of different turbidity, during for the low-cloudy water waste water filtering, turbidity removal rate can reach more than 94%, during for higher turbid water filter, turbidity removal rate can reach more than 99%, and is better than low-cloudy water treatment effect.
Description
Technical field
The present invention relates to a kind of water treatment method, specifically, is a kind of treatment process of waste circulating cooling water in heat-engine plant.
Background technology
In thermal power plant's process water, recirculated cooling water accounts for larger specific gravity, therefore, waste circulating cooling water is handled to recycle, and helps water saving.The purpose of wastewater treatment is in order to remove suspended substance, microorganism and the control Ca in the waste water
2+, Mg
2+, Cl
-, SO
4 2-Plasma content is to reach the requirement to circulating cooling water quality.
At present, the normal treatment process that adopts is " coagulating sedimentation-filtration-ion exchange treatment ", contain suspended substance in the recirculated cooling water, microorganism, pollutent is (as earth in the air, foreign material, and interchanger material seepage etc.), cause in the recirculated water microbial reproduction and in the pipeline of recirculating cooling water system, produce fouling, corrosion and foundry loam, cause heat exchanger efficiency to reduce, energy dissipation, water-carrying section reduces, and water passing capacity reduces, even makes equipment and pipeline corrosion, perforation, lead to a disaster, use coagulant sedimentation can effectively hold back these small suspended substances etc., by filtering most of suspended solids in the further removal water, foundry loam and microorganism etc.Be applied to the filtering filtrate of water treatment now based on quartz sand, hard coal etc.But, the porosity of filtrates such as traditional quartz sand, hard coal is low, specific surface area is little, retaining power is poor, yield poorly, the water quality instability, filtration cycle and work-ing life are short, have been difficult to satisfy the Industrial Wastewater Treatment of various composition complexity and have polluted the domestic water that day by day increases the weight of, the requirement of process water advanced treatment.Can be used for desalting method at present and mainly contain distillation method, ion exchange method, reverse osmosis method and electroosmose process etc.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of treatment process that is applicable to the waste circulating cooling water in heat-engine plant that different turbidity waters are handled.
In order to address the above problem, the treatment process of waste circulating cooling water in heat-engine plant of the present invention, comprise coagulating sedimentation, filtration and ion exchange treatment step, it is characterized in that: in the described filtration step, adopt the filter post to filter, be filled with from top to bottom anthracite coal measure and rare earth porcelain layer of sand in the filter post, wherein the height of anthracite coal measure is 500～600mm, and the height of rare earth porcelain layer of sand is 500～600mm; When the filter post filtered, the flow velocity of liquid was 6～18m/h.
The present invention filters by the double-deck homogeneous filtering material of hard coal+rare earth porcelain sand, can remove most suspended substances in the waste water.Rare earth porcelain sand is to use one of increasing water treatment filter material in recent years, and it has extremely strong Filtration Adsorption ability, characteristics such as high strength, low resistance, corrosion-resistant, nontoxicity, regeneration are simple, long service life.Advantages such as ANTHRACITE FILTER MEDIA has the physical strength height, and chemical property is stable, does not contain poisonous objectionable impurities, does not all dissolve in general acidity, alkalescence, neutral water, and particle diameter is joined level rationally, and specific surface area is good.Hard coal is lighter, as the upper strata filtrate, can effectively remove the colloidal impurity in the water; Rare earth porcelain sand can improve suspended particle and remove ability as lower floor's filtrate.The double-layer filter material that is made of " hard coal+rare earth porcelain sand " has made retaining power and has improved 2～2.5 times.
As the technique scheme preferred embodiment, above-mentioned anthracitic granularity is 0.8～1.8mm, and proportion is 1.55g/cm
3
As the technique scheme preferred embodiment, the granularity of above-mentioned rare earth porcelain sand is 1.0～1.5mm, and proportion is 2.4g/cm
3
As the technique scheme preferred embodiment, below above-mentioned rare earth porcelain layer of sand, also be filled with quartz sand thickness, the height of this quartz sand thickness is 50～150mm, and granularity is 2～4mm, and proportion is 2.6g/cm
3
As another preferred embodiment of technique scheme, in above-mentioned coagulating sedimentation step, at first in waste water, add polymer alumina and coagulant aids, with Al
2O
3The dosage of meter polymerize aluminum chloride is 5～10mg/L, and the dosage of coagulant aids is 1～3mg/L, and the stirring velocity with 100～600r/min stirs 1～2min again, leaves standstill 10～20min then.Coagulant aids is a kind of in PAM, activated silica gel, gelatine, sodium alginate, the calcium oxide.
Experiment shows, adds polymer alumina separately, and alumen ustum is tiny, and sedimentation is slower, and need leave standstill 30min could naked-eye observation precipitate more complete.Add a small amount of coagulant aids when adding polymer alumina, alumen ustum forms rapidly, and alumen ustum is bigger, and closely knit, and sedimentation is very fast, and sedimentation is very good within the 5min.
As another preferred embodiment of technique scheme, in described ion exchange treatment step, adopt the Weak-acid cation exchange column to carry out ion exchange treatment, to remove most of basicity and the hardness in the waste water, filtration velocity is 10～60m/h.For Cl
-After the exchange of Weak-acid cation post is finished dealing with, handle with anion-exchange column in extra high water quality of content or water resources shortage area again, to reduce Cl
-Concentration, and can further reduce turbidity, filtration velocity is 10～60m/h.If SO in the water
4 2-Content is very high, adopts the strong-acid cation exchange column to carry out ion exchange treatment, and filtration velocity is 10～60m/h.
Compared with prior art, the invention has the beneficial effects as follows:
(1) adopt the double-deck homogeneous filtering material of hard coal+rare earth porcelain sand to filter and can remove most suspended substances, the Weak-acid cation exchange process can be removed most of basicity and hardness.Thermal power plant's circulation cooling sewer is handled in two technology couplings, and effluent quality can satisfy the reuse requirement fully.
(2) filter post of the present invention is applicable to the waste water of different turbidity, and during for the low-cloudy water waste water filtering, turbidity removal rate can reach more than 94%, and during for higher turbid water filter, turbidity removal rate can reach more than 99%, and is better than low-cloudy water treatment effect.
(3) add polymer alumina and coagulant aids during coagulating sedimentation, precipitation fast.
Embodiment
Knot embodiment further is illustrated the present invention below.
Step (1), coagulating sedimentation
At first in waste water, add polymer alumina and coagulant aids, with Al
2O
3The dosage of meter polymerize aluminum chloride is 8mg/L, and the dosage of coagulant aids is 1.5mg/L, and the stirring velocity with 100r/min stirs 1min again, staticly settles 15min then.Post precipitation is got and is precipitated the aquametry turbidity at the middle and upper levels, and turbidity is below the 3NTU, and raw water turbidity is 6.15NTU.Coagulant aids is a kind of in PAM, activated silica gel, gelatine, sodium alginate, the calcium oxide.
Step (2), filtration
Entering the filter post after step (1) is finished filters.Filtration unit is made up of a filter post, high 1.5m, internal diameter 150mm.The filtrate formation of filter post sees Table 1.
Table 1: the filter bed of experiment constitutes
Filter post filtering velocity is controlled at 6～18m/h, respectively with 6m/h, and 8m/h, 10m/h, 12m/h, 14m/h, filtering velocity 2～3 cycles of operation of 16m/h, about 48h of each cycle.The filtration unit effect sees Table 2.
Table 2: different filtration velocity filter effects
As seen from Table 2, after coagulating sedimentation filtered, all below 0.8NTU, turbidity removal rate can reach 90%～96% to average delivery turbidity, and was respond well; Specific conductivity slightly rises, and pH reduces slightly, but changes all little.Even low-cloudy water, the clearance of sedimentation and filtration can both reach more than 90%.
Treatment effect when dealing with the water quality situation of burst for inquiring into filtration unit, human configuration higher turbidity water carries out the flocculation sediment filtration test.Get earth and add water and stir, leave standstill 30min, (the preceding raw water turbidity of flocculation is 50～100NTU) to join in the coagulation device, stirs, and has measured turbidity in advance to get the floor height muddy water.Processes such as flocculation sediment filtration are with the low-cloudy water filtration test.That is: in the test, get PAC dosage 8mg/L, PAM dosage 1.5mg/L.Mix fast, coagulation 1min, precipitation 15min filters.Raw water turbidity 54.4～88.8NTU, coagulating sedimentation filter the turbidity of back water and reduce to 0.25～0.53NTU.
The effect that Filter column is handled higher turbidity water sees Table 3.Filter post operation promptly thought later on and reached steady running in 3 hours, so filter post operation after three hours, water sampling is measured turbidity again.
Table 3: higher turbidity water filtration effect
As shown in Table 3, this filtration unit is when filtering higher turbidity water, and turbidity removal rate increases and slightly reduces with filtration velocity, but turbidity removal rate is filtered the back delivery turbidity between 0.25～0.53NTU, than low-cloudy water better effects if all the time more than 99%.
Step (3), ion exchange treatment
The high 1000mm of cationic exchange coloum, internal diameter is 80mm, filling D113 type weak acid acrylic acid type cation exchange resin, height 800mm considers that the recirculated cooling water make up water (mainly comprises pH, basicity, turbidity, hardness, BOD5, CODCr, TP, NH to requirements in water quality
4+-N, muriate etc.), so the filtration velocity value is higher, be 25～45m/h.
1, cationic exchange coloum pre-treatment
At first use the deionized water rinsing resin till the clarification of water, the hydrochloric acid of abundant swollen resin with 4 times of amount 1mol/L is slowly flow through, be washed till neutral back with deionized water again and slowly flow through, be washed till neutral standby with deionized water with 4 times of NaOH solution of measuring massfractions 4%.
2. ion exchange treatment
Filtering velocity is respectively 25m/h, 30m/h, and 35m/h, 40m/h, during 45m/h, Weak-acid cation post operation treatment effect sees Table 4.
Table 4: the treatment effect of Weak-acid cation exchange column under different filtering velocitys
As can be seen from Table 4, even under the 45m/h filtration velocity, cationic exchange coloum water outlet effect is still very good.The general travelling speed of cationic exchange coloum is no more than 60m/h at 10～40m/h.Consider the requirement of recirculated cooling water reuse water, the filtering velocity increase helps the reduction of the cost of ion-exchange unit, and it also is feasible technically that 35m/h filters filtering velocity, is cationic exchange coloum optimum filtration speed so choose 35m/h.In addition, it is too low that the cationic exchange water outlet removes pH, and this water outlet is enough reuses.Through the Weak-acid cation exchange column, hardness, basicity are removed substantially, and specific conductivity reduces about 50%, and pH reduces to about 4.3 by about 8.Cl
-Slightly raise, but still be controlled at below the 40mg/L.2007 editions circulating cooling water quality index regulations, chloride ion content need be not more than 700mg/L, and general water quality recirculated cooling water does not need anion exchange process.Consider the correlative factor of specific conductivity etc. again, relatively comprehensive, if need to handle the very high recirculated cooling water of chloride ion content, can increase anion exchange system again, saltiness can reduce greatly like this, and turbidity also can further reduce.Then concentration rate can improve greatly, and this is well-adapted for the water-deficient area.
Adopt the Weak-acid cation post can not reduce Cl
-Deng anion-content, for Cl
-Extra high water quality of content or water resources shortage area can be considered to add anionresin again and handle, to reduce Cl
-Concentration, and can further reduce turbidity.If SO in the water
4 2-Content is very high, and it is unfavorable then handling with low-acid cationic resin, can select strong acid cation resin for use.
Claims (9)
1. the treatment process of a waste circulating cooling water in heat-engine plant, comprise coagulating sedimentation, filtration and ion exchange treatment step, it is characterized in that: in the described filtration step, adopt the filter post to filter, be filled with from top to bottom anthracite coal measure and rare earth porcelain layer of sand in the filter post, wherein the height of anthracite coal measure is 500～600mm, and the height of rare earth porcelain layer of sand is 500～600mm; When the filter post filtered, the flow velocity of liquid was 6～18m/h.
2. the treatment process of waste circulating cooling water in heat-engine plant according to claim 1, it is characterized in that: described anthracitic granularity is 0.8～1.8mm, proportion is 1.55g/cm
3
3. the treatment process of waste circulating cooling water in heat-engine plant according to claim 1, it is characterized in that: the granularity of described rare earth porcelain sand is 1.0～1.5mm, proportion is 2.4g/cm
3
4. according to the treatment process of the arbitrary described waste circulating cooling water in heat-engine plant of claim 1 to 3, it is characterized in that: below described rare earth porcelain layer of sand, also be filled with quartz sand thickness, the height of this quartz sand thickness is 50～150mm, and granularity is 2～4mm, and proportion is 2.6g/cm
3
5. the treatment process of waste circulating cooling water in heat-engine plant according to claim 1 is characterized in that: in described coagulating sedimentation step, at first add polymer alumina and coagulant aids in waste water, with Al
2O
3The dosage of meter polymerize aluminum chloride is 5～10mg/L, and the dosage of coagulant aids is 1～3mg/L, and the stirring velocity with 100～600r/min stirs 1～2min again, leaves standstill 10～20min then.
6. the treatment process of waste circulating cooling water in heat-engine plant according to claim 5 is characterized in that: described coagulant aids is a kind of in PAM, activated silica gel, gelatine, sodium alginate, the calcium oxide.
7. the treatment process of waste circulating cooling water in heat-engine plant according to claim 1 is characterized in that: in described ion exchange treatment step, adopt the Weak-acid cation exchange column to carry out ion exchange treatment, filtration velocity is 10～60m/h.
8. the treatment process of waste circulating cooling water in heat-engine plant according to claim 7 is characterized in that: after the exchange of Weak-acid cation post is finished dealing with, handle with anion-exchange column, filtration velocity is 10～60m/h again.
9. the treatment process of waste circulating cooling water in heat-engine plant according to claim 1 is characterized in that: in described ion exchange treatment step, adopt the strong-acid cation exchange column to carry out ion exchange treatment, filtration velocity is 10～60m/h.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649609A (en) * | 2011-02-25 | 2012-08-29 | 栗田工业株式会社 | Coagulation filtering method |
| CN103058412A (en) * | 2012-12-26 | 2013-04-24 | 宝钢集团广东韶关钢铁有限公司 | Hot stewing circulating water treatment process for steel slag |
| CN105143113A (en) * | 2013-03-13 | 2015-12-09 | 凯登公司 | Whitewater recovery process |
| CN107176727A (en) * | 2017-07-18 | 2017-09-19 | 马鞍山中创环保科技有限公司 | A kind of processing method of sewage from industrial cycle water |
| CN107986410A (en) * | 2017-12-08 | 2018-05-04 | 西安科技大学 | A kind of method of power plant's treating nature water |
| CN109665592A (en) * | 2018-12-14 | 2019-04-23 | 四川金象赛瑞化工股份有限公司 | One kind exchanging acidification softening method with low-acid cationic resin |
-
2009
- 2009-08-10 CN CN200910104570A patent/CN101613159A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649609A (en) * | 2011-02-25 | 2012-08-29 | 栗田工业株式会社 | Coagulation filtering method |
| CN102649609B (en) * | 2011-02-25 | 2015-09-16 | 栗田工业株式会社 | Coagulation and filtration method |
| KR101843202B1 (en) | 2011-02-25 | 2018-03-28 | 쿠리타 고교 가부시키가이샤 | Agglomerating and filtering method |
| CN103058412A (en) * | 2012-12-26 | 2013-04-24 | 宝钢集团广东韶关钢铁有限公司 | Hot stewing circulating water treatment process for steel slag |
| CN105143113A (en) * | 2013-03-13 | 2015-12-09 | 凯登公司 | Whitewater recovery process |
| US9506190B2 (en) | 2013-03-13 | 2016-11-29 | Kadant Inc. | Whitewater recovery process |
| CN107176727A (en) * | 2017-07-18 | 2017-09-19 | 马鞍山中创环保科技有限公司 | A kind of processing method of sewage from industrial cycle water |
| CN107986410A (en) * | 2017-12-08 | 2018-05-04 | 西安科技大学 | A kind of method of power plant's treating nature water |
| CN109665592A (en) * | 2018-12-14 | 2019-04-23 | 四川金象赛瑞化工股份有限公司 | One kind exchanging acidification softening method with low-acid cationic resin |
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Open date: 20091230 |