CN102259997A - Method for treating desulfurized wastewater - Google Patents
Method for treating desulfurized wastewater Download PDFInfo
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- CN102259997A CN102259997A CN2011102041479A CN201110204147A CN102259997A CN 102259997 A CN102259997 A CN 102259997A CN 2011102041479 A CN2011102041479 A CN 2011102041479A CN 201110204147 A CN201110204147 A CN 201110204147A CN 102259997 A CN102259997 A CN 102259997A
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- desulfurization wastewater
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- wastewater treatment
- sodium hydroxide
- coagulant aids
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Abstract
The invention relates to sewage treatment and discloses a method for treating desulfurized wastewater. In the invention, organic sulfur in a reaction chamber and a coagulant in a flocculation box are not used; a coagulant aid is directly added into the desulfurized wastewater subjected to regulation of a pH value; a drug adding port and a drug adding position are regulated; dispersed suspended particles in the desulfurized wastewater are condensed into large flocculating constituent particles, impurities such as heavy metals and the like in the wastewater are precipitated at the bottom of a tank after the desulfurized wastewater is processed by a clarifying and concentrating tank and clear water on the upper layer overflows to a neutralization tank; and furthermore, sodium hypochlorite and hydrochloric acid are not used in the neutralization tank, a drug adding point of sodium hydroxide is moved to a reduction tank from the position in front of a pH regulating box and a drug adding point of the coagulant aid is moved to the reaction chamber from the position in front of the flocculation box, so that the types of drugs which need to be added in the process of treating the desulfurized wastewater are reduced, the drug addition complexity is reduced, the effluent quality of the desulfurized wastewater is avoided being influenced due to the excessively added drugs and the drug addition cost is also reduced.
Description
Technical field
The present invention relates to sewage disposal, particularly the treatment technology of desulfurization wastewater.
Background technology
The desulfurization wastewater treatment system is mainly used in to be handled the overflow of waste-water vortex device and is discharged to desulfurization wastewater in the waste water storage tank, and the impurity that contains in the desulfurization wastewater mainly is suspended substance, oversaturated sulphite, vitriol and heavy metal.
Present desulfurization wastewater treatment scheme as shown in Figure 1, desulfurization wastewater is delivered to reduction sagger by the waste water transferpump, flow into the pH adjusting tank through reduction sagger, in the pH adjusting tank, add sodium hydroxide, the effect of sodium hydroxide is to improve wastewater pH, produce heavy metal precipitation, remove the heavy metal in the desulfurization wastewater.By in the pH adjusting tank, adding sodium hydroxide to remove the part heavy metal, just add organosulfur after flowing in the reaction box subsequently and remove zunsober and cupric sulfide, add flocculation agent and coagulant aids after flowing into flocculation tanks, dispersive suspended particle in the waste water is condensed into the flocs unit of larger particles, contamination precipitation such as heavy metal is at the bottom of the pond in clarification makes waste water behind the concentration basin, upper strata clear water overflow in and case, add clorox with COD in the oxidizing water (chemical oxygen demand (COD)), and add hydrochloric acid pH is adjusted to 6.0-9.0, flow to qualified discharge behind the water tank.The mud that is deposited at the bottom of the settling pond pond need drain into the mud transmission pump, carries out centrifuge dehydration, and the dosage of employed chemical conditioner is generally 20% during centrifuge dehydration.
Yet, the present inventor finds, in whole desulfurization wastewater treating processes, need to use and comprise sodium hydroxide, organosulfur, flocculation agent, coagulant aids, clorox, hydrochloric acid at six kinds of interior medicines, dosing process complexity, dosing is various in style, also causes dosing cost height, and adds drug overdose and may influence the desulfurization wastewater effluent quality on the contrary.In addition, dosing is inhomogeneous also to influence flocculating effect easily, thereby influences effluent quality.
Summary of the invention
The object of the present invention is to provide a kind of desulfurization wastewater treatment process, the medicament kind to need in the processing of minimizing desulfurization wastewater to add reduces the dosing complexity, avoids also having reduced the dosing cost simultaneously because of adding the effluent quality that drug overdose has influence on desulfurization wastewater.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of desulfurization wastewater treatment process, comprise following steps:
By in described desulfurization wastewater, adding sodium hydroxide, the hydrogen ionexponent pH value of described desulfurization wastewater is adjusted;
To stop using through the adjusted desulfurization wastewater of described pH value organosulfur and flocculation agent, add coagulant aids;
By settling pond will add in the desulfurization wastewater behind the described coagulant aids comprise heavy metal at interior contamination precipitation at the bottom of the pond, upper strata clear water overflow in and be expelled to water tank behind the case.
Embodiment of the present invention in terms of existing technologies, the organosulfur in the reaction box of having stopped using, the flocculation agent in the flocculation tanks.To directly adding coagulant aids through the adjusted desulfurization wastewater of pH value.By settling pond will add in the desulfurization wastewater behind the coagulant aids comprise heavy metal at interior contamination precipitation at the bottom of the pond, upper strata clear water overflow in and be expelled to water tank behind the case.Evidence under the situation that does not add organosulfur and flocculation agent PAC, is directly used coagulant aids, still can reach good coagulation effect, and the wastewater effluent turbidity can be kept less than 20NTU.Therefore by organosulfur and the flocculation agent of stopping using, having reduced needs the medicament kind of adding during desulfurization wastewater is handled, reduced the dosing complexity, avoids because of adding the effluent quality that drug overdose has influence on desulfurization wastewater, and the while has also been reduced the dosing cost.
In addition, the snack made with traditional Chinese medicines that adds of sodium hydroxide is moved forward to reduction sagger by the pH adjusting tank, the snack made with traditional Chinese medicines that adds of coagulant aids is moved forward to reaction box by flocculation tanks, can guarantee the result of use of medicament so that the reaction times of waste water and medicament is longer.
In addition, when in reduction sagger, adding sodium hydroxide and in reaction box, adding coagulant aids, sodium hydroxide and coagulant aids are dispersed in respectively at least 2 dosing mouths of described reduction sagger and reaction box, join in the desulfurization wastewater, it is more even to make that waste water mixes with coagulant aids, avoid influencing flocculating effect, thereby have influence on the problem of effluent quality because of dosing is inhomogeneous.
In addition, in and stop using in the case clorox and hydrochloric acid, because test finds that the adding of clorox is little to the removal effect of desulfurization wastewater COD (chemical oxygen demand (COD)), and the pH value is adjusted at just can satisfy the effect that heavy metal is removed between the 8.5-9.0, still can guarantee discharged wastewater met the national standard after clorox and the hydrochloric acid in therefore having stopped using and in the case.By in and stop using in the case clorox and hydrochloric acid, can further reduce desulfurization wastewater needs the medicament kind of adding in handling, and reduces the dosing complexity, has also reduced the dosing cost simultaneously.
In addition, the mud that is deposited at the bottom of the settling pond pond is carried out centrifuge dehydration, the dosage of employed chemical conditioner drops to 10% by original 20% during centrifuge dehydration.Owing to find in the test, the used chemical conditioner of centrifuge adds dose and drops to the 10% desliming requirement that can satisfy whizzer by original 20%, by adjusting the using dosage of chemical conditioner, can further reduce the dosing cost.
Description of drawings
Fig. 1 is according to desulfurization wastewater treatment process synoptic diagram of the prior art;
Fig. 2 is the desulfurization wastewater process flow figure according to first embodiment of the invention;
Fig. 3 is the desulfurization wastewater treatment process synoptic diagram according to first embodiment of the invention.
Embodiment
First embodiment of the present invention relates to a kind of desulfurization wastewater treatment process.Idiographic flow as shown in Figure 2.
In step 201, when desulfurization wastewater is delivered to reduction sagger by the waste water transferpump, in reduction sagger, add sodium hydroxide, the pH value of desulfurization wastewater is adjusted.Move forward to reduction sagger by sodium hydroxide being added snack made with traditional Chinese medicines by the pH adjusting tank, can so that the reaction times of sodium hydroxide and desulfurization wastewater longer.
Then, in step 202, the desulfurization wastewater in the reduction sagger is disposed to the pH adjusting tank.
Then, in step 203, the desulfurization wastewater in the pH adjusting tank is disposed to reaction box.Inactive organosulfur adds coagulant aids in reaction box.Evidence under the situation that does not add organosulfur and flocculation agent PAC, is directly used coagulant aids, still can reach good coagulation effect, and the wastewater effluent turbidity can be kept less than 20NTU.Such as, be adjusted at 9.0 o'clock at desulfurization wastewater pH, under the situation that does not add flocculation agent PAC, as long as coagulant aids PAM concentration reaches 0.7mg/L to 1.1mg/L, can reach good coagulation effect, and the adding consistency of coagulant aids PAM is generally 0.3mg/L to 0.6mg/L in the former desulfurization wastewater treatment system, and the adding consistency of PAC is generally 50mg/L to 100mg/L.Therefore, reach good coagulation effect for making present embodiment, by add sodium hydroxide in reduction sagger the pH value of desulfurization wastewater is adjusted into 9.0, the dosage of the coagulant aids that adds in reaction box is 0.7mg/L to 1.1mg/L.In addition, move forward to reaction box by flocculation tanks by coagulant aids is added snack made with traditional Chinese medicines, can so that the reaction times of coagulant aids and desulfurization wastewater longer.
What deserves to be mentioned is that in the present embodiment, when adding sodium hydroxide and adding coagulant aids in reduction sagger in reaction box, sodium hydroxide and coagulant aids are dispersed in respectively at least 2 dosing mouths of described reduction sagger and reaction box, join in the desulfurization wastewater.By each dosing mouth place the dosing divider is installed respectively, can be avoided influencing flocculating effect, thereby have influence on the problem of effluent quality so that desulfurization wastewater mixes more evenly with sodium hydroxide and coagulant aids because of dosing is inhomogeneous at reduction sagger and reaction box.
Then, in step 204, the desulfurization wastewater in the reaction box is disposed to settling pond through flocculation tanks, by this settling pond will add in the desulfurization wastewater behind the coagulant aids comprise heavy metal at interior contamination precipitation at the bottom of the pond, upper strata clear water overflow in and case.
Then, in step 205, in and stop using in the case clorox and hydrochloric acid, will in and in the case after clarifying upper strata clear water flow to water tank qualified discharge.Because test finds that the adding of clorox is little to the removal effect of desulfurization wastewater COD (chemical oxygen demand), and the pH value is adjusted at just can satisfy the effect that heavy metal is removed between the 8.5-9.0, therefore still can guarantee discharged wastewater met the national standard after clorox that has added and the hydrochloric acid in having stopped using and in the case.
Need to prove, in the desulfurization wastewater treatment process of present embodiment, also comprise the water in the settling pond is transferred to pH adjusting tank and reduction sagger by sludge circulation pump, and the mud that is deposited at the bottom of the settling pond pond carried out steps such as centrifuge dehydration, but these steps are same as the prior art, so do not repeat them here.
Fig. 3 is the desulfurization wastewater treatment process synoptic diagram of present embodiment, compares with existing desulfurization wastewater treatment process shown in Figure 1, is not difficult to find, in the present embodiment, stopped using organosulfur in the reaction box, the flocculation agent in the flocculation tanks, in and clorox and hydrochloric acid in the case.To directly adding coagulant aids through the adjusted desulfurization wastewater of pH value.After adding coagulant aids, by settling pond will add in the desulfurization wastewater behind the coagulant aids comprise heavy metal at interior contamination precipitation at the bottom of the pond, upper strata clear water overflow in case after discharge.Having reduced desulfurization wastewater needs the medicament kind of adding in handling, and has reduced the dosing complexity, avoids because of adding the effluent quality that drug overdose has influence on desulfurization wastewater, and the while has also been reduced the dosing cost.
And, the snack made with traditional Chinese medicines that adds of sodium hydroxide is moved forward to reduction sagger by the pH adjusting tank, the snack made with traditional Chinese medicines that adds of coagulant aids is moved forward to reaction box by flocculation tanks, can guarantee the result of use of medicament so that the reaction times of waste water and medicament is longer.
Second embodiment of the present invention relates to a kind of desulfurization wastewater treatment process.Second embodiment has been done further improvement on the basis of first embodiment, main improvements are: in second embodiment of the invention, when the sewage at the bottom of being deposited in the settling pond pond was carried out centrifuge dehydration, the dosage of employed chemical conditioner dropped to 10% by original 20%.Owing to find in the test, the used chemical conditioner of centrifuge adds dose and drops to the 10% desliming requirement that can satisfy whizzer by original 20%, therefore by adjusting the using dosage of chemical conditioner, can further reduce the dosing cost.
The respective embodiments described above are to realize specific embodiments of the invention, and in actual applications, can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (9)
1. a desulfurization wastewater treatment process is characterized in that, comprises following steps:
By in described desulfurization wastewater, adding sodium hydroxide, the hydrogen ionexponent pH value of described desulfurization wastewater is adjusted;
To stop using through the adjusted desulfurization wastewater of described pH value organosulfur and flocculation agent, add coagulant aids;
By settling pond will add in the desulfurization wastewater behind the described coagulant aids comprise heavy metal at interior contamination precipitation at the bottom of the pond, upper strata clear water overflow in and be expelled to water tank behind the case.
2. desulfurization wastewater treatment process according to claim 1 is characterized in that, and is described by adding in the step that sodium hydroxide adjusts the pH value, comprises following substep:
In reduction sagger, add described sodium hydroxide.
3. desulfurization wastewater treatment process according to claim 2 is characterized in that,
When adding described sodium hydroxide in reduction sagger, described sodium hydroxide is dispersed in 2 dosing mouths of described reduction sagger at least, joins in the described desulfurization wastewater.
4. desulfurization wastewater treatment process according to claim 1 is characterized in that, and is described to adding in the step of coagulant aids through the adjusted desulfurization wastewater of described pH value, comprises following substep:
In reaction box, add described coagulant aids.
5. desulfurization wastewater treatment process according to claim 3 is characterized in that,
When adding described coagulant aids in reaction box, described coagulant aids is dispersed in 2 dosing mouths of described reaction box at least, joins in the described desulfurization wastewater.
6. desulfurization wastewater treatment process according to claim 1 is characterized in that,
Inactive clorox and hydrochloric acid in described and in the case.
7. according to each described desulfurization wastewater treatment process in the claim 1 to 6, it is characterized in that the adding dosage of described coagulant aids is 0.7mg/L to 1.1mg/L.
8. according to each described desulfurization wastewater treatment process in the claim 1 to 6, it is characterized in that, also comprise following steps:
The sewage that is deposited at the bottom of the described settling pond pond is carried out centrifuge dehydration, and the dosage of employed chemical conditioner drops to 10% by original 20% during centrifuge dehydration.
9. according to each described desulfurization wastewater treatment process in the claim 1 to 6, it is characterized in that, described by adding in the step that sodium hydroxide adjusts the pH value, described pH value is adjusted into 9.0.
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| CN2011102041479A CN102259997A (en) | 2011-07-20 | 2011-07-20 | Method for treating desulfurized wastewater |
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| CN2011102041479A CN102259997A (en) | 2011-07-20 | 2011-07-20 | Method for treating desulfurized wastewater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007089A (en) * | 2016-07-08 | 2016-10-12 | 大唐环境产业集团股份有限公司 | Triple-box type wastewater treatment device |
| CN106186438A (en) * | 2016-08-26 | 2016-12-07 | 江苏绿川环保科技有限公司 | A kind of desulfurization wastewater treatment system and technique |
| CN106430713A (en) * | 2016-10-31 | 2017-02-22 | 陕西蔚蓝节能环境科技集团有限责任公司 | Wet desulphurization wastewater zero-discharge treatment device |
| CN108529808A (en) * | 2018-06-14 | 2018-09-14 | 南京东大能源工程设计院有限公司 | A kind of desulfurization wastewater treatment system and technique |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2900501Y (en) * | 2006-03-13 | 2007-05-16 | 常州市江南电力设备厂有限公司 | Desulfurizing waste water treating device |
-
2011
- 2011-07-20 CN CN2011102041479A patent/CN102259997A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2900501Y (en) * | 2006-03-13 | 2007-05-16 | 常州市江南电力设备厂有限公司 | Desulfurizing waste water treating device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007089A (en) * | 2016-07-08 | 2016-10-12 | 大唐环境产业集团股份有限公司 | Triple-box type wastewater treatment device |
| CN106186438A (en) * | 2016-08-26 | 2016-12-07 | 江苏绿川环保科技有限公司 | A kind of desulfurization wastewater treatment system and technique |
| CN106430713A (en) * | 2016-10-31 | 2017-02-22 | 陕西蔚蓝节能环境科技集团有限责任公司 | Wet desulphurization wastewater zero-discharge treatment device |
| CN108529808A (en) * | 2018-06-14 | 2018-09-14 | 南京东大能源工程设计院有限公司 | A kind of desulfurization wastewater treatment system and technique |
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Application publication date: 20111130 |