CN104803504A - Novel desulfurization waste water treatment method - Google Patents

Novel desulfurization waste water treatment method Download PDF

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Publication number
CN104803504A
CN104803504A CN201510064182.3A CN201510064182A CN104803504A CN 104803504 A CN104803504 A CN 104803504A CN 201510064182 A CN201510064182 A CN 201510064182A CN 104803504 A CN104803504 A CN 104803504A
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waste water
tank
reactive tank
heavy metal
order reaction
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CN104803504B (en
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何正新
石俊哲
郭建军
杨菲
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Jiangsu Yuan Neng Genie Et Environnement
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Jiangsu Yuan Neng Genie Et Environnement
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Abstract

The invention discloses a novel desulfurization waste water treatment method. The novel desulfurization waste water treatment method comprises following steps: waste water is pumped into a first grade reaction sedimentation tank from an adjusting tank using a lift pump, NaOH and lime milk are added so as to remove sulfites, sulfates, and non-metallic suspended matters in waste water, and an obtained sediment 1 is delivered into a sludge buffer tank; waste water is delivered into a second grade reaction sedimentation tank from the first grade reaction sedimentation tank via overflowing, NaOH, a heavy metal chelating agent, and a flocculating agent are added so as to remove heavy metal ions in waste water, and an obtained sediment 2 is delivered into the sludge buffer tank; obtained sludge is subjected to sludge-water separation using a plate-and-frame filter press, an obtained filtrate is delivered back into the waste water adjusting tank, and sludge cake is collected; waste water processed via the second grade reaction sedimentation tank is delivered into a clear water tank, HCl is added so as to adjust pH value to be 7, and then obtained water is discharged or recycled. According to the novel desulfurization waste water treatment method, sludge obtained via sedimentation in the first grade reaction sedimentation tank and the second grade reaction sedimentation tank is delivered into the sludge buffer tank via pipelines, so that system blocking of a processing system caused by large amount of sludge is avoided, and quality of the discharged water is increased.

Description

A kind of Novel desulphurization waste water treatment process
Technical field
The present invention relates to environmental protection and field of waste water treatment, particularly relate to a kind of Novel desulphurization waste water treatment process, the inorganic mineral mud produced for the treatment of desulfurization wastewater and calcification mud.
Background technology
The waste water that smoke-gas wet desulfurization (limestone/gypsum method) produces, mainly comprises suspended substance, oversaturated sulphite, vitriol, heavy metal and chlorion etc.Desulfurization wastewater has following characteristics: turbidity is high, suspension content is large, and concentration of suspension is up to 20000mg/L, containing plurality of heavy metal material, vitriol, sulphite, large to equipment corrosion.The characteristic of desulfurization wastewater itself determines such waste water and belongs to more difficult waste water.At present, conventional power plant's wet desulphurization wastewater treatment adopts single-stage chemical precipitation method, by add the medicament reactions such as milk of lime, flocculation agent, coagulant aids, organosulfur in waste water after, solid-liquid separation is carried out in settler, add hydrochloric acid in clear water and be adjusted to neutral rear qualified discharge, there are some problems in existing desulfuration waste water treatment process, such as because the solid contents in desulfurization wastewater is very high, the body refuse amount that Waste Water Treatment produces is comparatively large, easily blocks; Heavy metal process difficulty is up to standard, and the problem such as cost is large.
Summary of the invention
The object of the invention is to solve inorganic sludge content in desulfurization wastewater large, treatment system easily blocks, and provides a kind of Novel desulphurization waste water treatment process.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of Novel desulphurization waste water treatment process, its technical process is as follows:
(1) collection of waste water regulates: collect desulfurization wastewater and enter equalizing tank, stirs balanced, prevents precipitation;
(2) first order reaction precipitation: waste water pumps into first order reaction settling tank through lift pump from equalizing tank, add NaOH, regulate pH to 10 ~ 13, most of heavy metal ion is made to become non-solubility state, add milk of lime again, to remove sulphite, the vitriol in waste water, nonmetal suspended substance, and part heavy metal ion, throw out enters mud baffle-box by the road bottom first order reaction pond;
(3) second order reaction precipitation: waste water enters second order reaction settling tank from the overflow of first order reaction settling tank, add NaOH, heavy metal chelant and polymeric ferric sulfate flocculant, to remove the heavy metal ion in waste water, throw out enters mud baffle-box by the road bottom second order reaction pond;
(4) mud-water separation: after the sludge agitation that enters mud baffle-box is homogeneous, pump into plate-and-frame filter press by mud feeding pump and carry out mud-water separation, filtrate enters reservoir, then is back to wastewater equalization pond, the mud cake outward transport obtained;
(5) discharge or reuse: the waste water through the process of second order reaction settling tank enters filtered water tank, after adding HCl adjustment pH to neutrality, discharge or reuse.
Desulfuration waste water treatment process of the present invention divides two-stage to precipitate, the mud precipitated through first order reaction precipitation and second order reaction enters mud baffle-box respectively by the road, avoid the system jams that treatment system causes because inorganic sludge content is large, meanwhile, improve effluent quality.
To the improvement of the technical scheme of above-mentioned Novel desulphurization waste water treatment process, described first order reaction settling tank first reactive tank, the second reactive tank and high rate settling tank, add NaOH to the waste water in the first reactive tank and regulate pH, waste water enters the second reactive tank through the first reactive tank overflow, in the second reactive tank, add milk of lime, waste water enters high rate settling tank through the second reactive tank overflow and precipitates, to remove sulphite, the vitriol in waste water, nonmetal suspended substance, and part heavy metal ion.
Adopt NaOH and milk of lime by sulphite oversaturated in waste water, vitriol, nonmetal suspended substance, and part heavy metal ion precipitates in first order reaction settling tank, reduce the consumption of follow-up flocculation agent and heavy metal chelant, thus reduce processing cost.
To the further improvement of the technical scheme of above-mentioned Novel desulphurization waste water treatment process, the upper area of described high rate settling tank arranges inclined tube or the double-deck negative area of swash plate, and aspect ratio is greater than 1.5 ~ 2:1, and suspended substance volumetric loading reaches 5000 ~ 10000mg/L.Described high rate settling tank upper area arranges inclined tube or the double-deck negative area of swash plate, particles settling does not disturb by turbulent flow, load is high, upper layer flows state is good, bucket end volume is large, carrying mud amount is large, due to bucket end design gradient rationally, cavity does not tie mud, spoil disposal speed is large, settling tank not easily blocks.
Improve further the another kind of the technical scheme of above-mentioned Novel desulphurization waste water treatment process, the hydraulic detention time of waste water in described first reactive tank, the second reactive tank and high rate settling tank is respectively 5 ~ 20min, 5 ~ 20min and be not less than 30min.
To improving further again of the technical scheme of above-mentioned Novel desulphurization waste water treatment process, described second order reaction settling tank comprises the 3rd reactive tank, 4th reactive tank, flocculation basin and efficient sedimentation tank, add NaOH to the waste water in the 3rd reactive tank and regulate pH, waste water enters the 4th reactive tank through the 3rd reactive tank overflow, heavy metal chelant is added to the waste water in the 4th reactive tank, waste water enters flocculation basin through the 4th reactive tank overflow, flocculate to the waste water polyaddition iron class flocculation agent in flocculation basin, waste water enters efficient sedimentation tank through flocculation basin overflow and precipitates, to remove the heavy metal ion in waste water, described polymeric iron class flocculation agent is polymeric ferric sulfate flocculant or poly ferric chloride flocculant agent.
In second order reaction precipitation, NaOH, heavy metal chelant and flocculation agent separately add, and make medicament and the abundant contact reacts of waste water, avoid the interaction between medicament, medicament utilization ratio is high simultaneously.
To the further improvement of the technical scheme of above-mentioned Novel desulphurization waste water treatment process, described efficient sedimentation tank be provided with vergence direction relative by swash plate or/and the high density that forms of inclined tube and lower concentration two settling regions, hydraulic load is 3 ~ 5m 3/ m 2.Enter waste water water in efficient sedimentation tank from bottom to top respectively through high density and lower concentration two settling regions, ensure that effluent quality.
The another kind of the technical scheme of above-mentioned Novel desulphurization waste water treatment process is further improved, the hydraulic detention time of waste water in the 3rd reactive tank, the 4th reactive tank, flocculation basin and efficient sedimentation tank is respectively 5 ~ 20min, 5 ~ 20min, 10 ~ 40min and be not less than 40min.
Further improve another of the technical scheme of above-mentioned Novel desulphurization waste water treatment process, described heavy metal chelant is Polydithiocarbamate salt compound.Polydithiocarbamate salt heavy metal chelant, all has satisfactory stability effect to all kinds of heavy metal, and low toxicity, meet eco-friendly requirement.
Beneficial effect of the present invention: desulfuration waste water treatment process of the present invention divides two-stage to precipitate, the mud precipitated through first order reaction precipitation and second order reaction enters mud baffle-box respectively by the road, avoid the system jams that treatment system causes because inorganic sludge content is large, improve effluent quality simultaneously.Adopt NaOH and milk of lime by sulphite oversaturated in waste water, vitriol, nonmetal suspended substance, and part heavy metal ion precipitates in first order reaction settling tank, reduces the consumption of flocculation agent and heavy metal chelant, thus reduce processing cost.Efficient sedimentation tank is adopted in second order reaction precipitation, described efficient sedimentation tank be provided with vergence direction relative by swash plate or/and the high density that forms of inclined tube and lower concentration two settling regions, enter waste water water in efficient sedimentation tank from bottom to top respectively through high density and lower concentration two settling regions, ensure that effluent quality.Described heavy metal chelant is Polydithiocarbamate salt compound.Polydithiocarbamate salt heavy metal chelant, all has satisfactory stability effect to all kinds of heavy metal, and low toxicity, meet eco-friendly requirement.
Accompanying drawing explanation
Fig. 1 is the processing technological flow figure of prior art.
Fig. 2 is processing technological flow figure of the present invention.
Embodiment
Fig. 1 shows the existing treatment process of desulfurization wastewater, by neutralizing, reacting, flocculate, waste water is processed, the invention will be further described for composition graphs 1 and Fig. 2, a kind of Novel desulphurization waste water treatment process, comprise second order reaction precipitation process, its technical process is as follows: the wastewater collection through gypsum swirler and vacuum belt dewaterer process is entered equalizing tank, after stirring equilibrium, pump into the first reactive tank of first order reaction settling tank through lift pump from equalizing tank, add NaOH to the waste water in the first reactive tank and regulate pH to 10 ~ 13, waste water enters the second reactive tank through the first reactive tank overflow, milk of lime is added in the second reactive tank, waste water enters high rate settling tank through the second reactive tank overflow and precipitates, to remove sulphite, the vitriol in waste water, nonmetal suspended substance, and part heavy metal ion, throw out enters mud baffle-box by the road bottom high loading reaction settling basin, waste water enters the 3rd reactive tank of second order reaction settling tank from the high rate settling tank overflow first order reaction precipitation, add NaOH to the waste water in the 3rd reactive tank and regulate pH to 7 ~ 13, waste water enters the 4th reactive tank through the 3rd reactive tank overflow, to waste water addition polymerization dithiocar-bamate heavy metal chelant (ZBJ) in the 4th reactive tank, waste water enters flocculation basin through the 4th reactive tank overflow, flocculate to the waste water polyaddition ferric sulfate flocculant in flocculation basin, waste water enters efficient sedimentation tank through flocculation basin overflow and precipitates, to remove the heavy metal ion in waste water, throw out enters mud baffle-box by the road bottom efficient sedimentation tank, by respectively from first order reaction settling tank and second order reaction settling tank enter by the road the sludge agitation of mud baffle-box homogeneous after, pump into plate-and-frame filter press by mud feeding pump and carry out mud-water separation, filtrate enters reservoir, then is back to wastewater equalization pond, the mud cake outward transport obtained, waste water through the process of second order reaction settling tank enters filtered water tank, after adding HCl adjustment pH to neutrality, and discharge or reuse.

Claims (8)

1. a Novel desulphurization waste water treatment process, its technical process is as follows:
(1) collection of waste water regulates: collect desulfurization wastewater and enter equalizing tank, stirs balanced, prevents precipitation;
(2) first order reaction precipitation: waste water pumps into first order reaction settling tank through lift pump from equalizing tank, add NaOH, regulate pH to 10 ~ 13, most of heavy metal ion is made to become non-solubility state, add milk of lime again, to remove sulphite, the vitriol in waste water, nonmetal suspended substance, and part heavy metal ion, throw out enters mud baffle-box by the road bottom first order reaction pond;
(3) second order reaction precipitation: waste water enters second order reaction settling tank from the overflow of first order reaction settling tank, add NaOH, heavy metal chelant and polymeric ferric sulfate flocculant, to remove the heavy metal ion in waste water, throw out enters mud baffle-box by the road bottom second order reaction pond;
(4) mud-water separation: after the sludge agitation that enters mud baffle-box is homogeneous, pump into plate-and-frame filter press by mud feeding pump and carry out mud-water separation, filtrate enters reservoir, then is back to wastewater equalization pond, the mud cake outward transport obtained;
(5) discharge or reuse: the waste water through the process of second order reaction settling tank enters filtered water tank, after adding HCl adjustment pH to neutrality, discharge or reuse.
2. Novel desulphurization waste water treatment process according to claim 1, it is characterized in that: described first order reaction settling tank comprises the first reactive tank, the second reactive tank and high rate settling tank, add NaOH to the waste water in the first reactive tank and regulate pH, waste water enters the second reactive tank through the first reactive tank overflow, milk of lime is added in the second reactive tank, waste water enters high rate settling tank through the second reactive tank overflow and precipitates, to remove sulphite, the vitriol in waste water, nonmetal suspended substance, and part heavy metal ion.
3. Novel desulphurization waste water treatment process according to claim 2, is characterized in that: the upper area of described high rate settling tank arranges inclined tube or the double-deck negative area of swash plate, and aspect ratio is greater than 1.5 ~ 2:1, and suspended substance volumetric loading reaches 5000 ~ 10000mg/L.
4. Novel desulphurization waste water treatment process according to claim 2, is characterized in that: the hydraulic detention time of waste water in described first reactive tank, the second reactive tank and high rate settling tank is respectively 5 ~ 20min, 5 ~ 20min and be not less than 30min.
5. the Novel desulphurization waste water treatment process according to the arbitrary claim of claim 1 ~ 4, it is characterized in that: described second order reaction settling tank comprises the 3rd reactive tank, 4th reactive tank, flocculation basin and efficient sedimentation tank, add NaOH to the waste water in the 3rd reactive tank and regulate pH to 7 ~ 12, waste water enters the 4th reactive tank through the 3rd reactive tank overflow, heavy metal chelant is added to the waste water in the 4th reactive tank, waste water enters flocculation basin through the 4th reactive tank overflow, flocculate to the waste water polyaddition iron class flocculation agent in flocculation basin, waste water enters efficient sedimentation tank through flocculation basin overflow and precipitates, to remove the heavy metal ion in waste water, described polymeric iron class flocculation agent is polymeric ferric sulfate flocculant or poly ferric chloride flocculant agent.
6. Novel desulphurization waste water treatment process according to claim 5, is characterized in that: described efficient sedimentation tank is provided with by the relative swash plate of vergence direction or/and the high density that forms of inclined tube and lower concentration two settling regions, and hydraulic load is 3 ~ 5m 3/ m 2.
7. Novel desulphurization waste water treatment process according to claim 5, it is characterized in that: the hydraulic detention time of waste water in the 3rd reactive tank, the 4th reactive tank, flocculation basin and efficient sedimentation tank is respectively 5 ~ 20min, 5 ~ 20min, 10 ~ 40min and be not less than 40min.
8. Novel desulphurization waste water treatment process according to claim 5, is characterized in that: described heavy metal chelant is Polydithiocarbamate salt compound.
CN201510064182.3A 2015-02-09 2015-02-09 Novel desulfurization waste water treatment method Active CN104803504B (en)

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Cited By (3)

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CN105084589A (en) * 2015-08-06 2015-11-25 中冶华天工程技术有限公司 Treatment method and system for wet magnesium desulphurization wastewater
CN105198127A (en) * 2015-10-30 2015-12-30 太仓东能环保设备有限公司 Technology for treating desulfurization waste water
CN107867770A (en) * 2017-12-26 2018-04-03 湖南钜晟环保科技工程有限公司 A kind of desulfurization wastewater treatment system and its processing method

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CN108191117A (en) * 2018-01-31 2018-06-22 济南大学 A kind of degreasing wastewater treatment equipment and technique

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Publication number Priority date Publication date Assignee Title
CN105084589A (en) * 2015-08-06 2015-11-25 中冶华天工程技术有限公司 Treatment method and system for wet magnesium desulphurization wastewater
CN105198127A (en) * 2015-10-30 2015-12-30 太仓东能环保设备有限公司 Technology for treating desulfurization waste water
CN107867770A (en) * 2017-12-26 2018-04-03 湖南钜晟环保科技工程有限公司 A kind of desulfurization wastewater treatment system and its processing method
CN107867770B (en) * 2017-12-26 2020-02-21 湖南钜晟环保科技工程有限公司 Desulfurization wastewater treatment system and treatment method thereof

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