CN105906161A - Novel process for thermal power plant denitration catalyst regeneration wastewater zero discharging treatment - Google Patents
Novel process for thermal power plant denitration catalyst regeneration wastewater zero discharging treatment Download PDFInfo
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- CN105906161A CN105906161A CN201610422569.6A CN201610422569A CN105906161A CN 105906161 A CN105906161 A CN 105906161A CN 201610422569 A CN201610422569 A CN 201610422569A CN 105906161 A CN105906161 A CN 105906161A
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- waste water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/08—Radiation
- A61L2/10—Ultra-violet radiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
- C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a novel process for thermal power plant denitration catalyst regeneration wastewater zero discharging treatment. The novel process comprises the steps of wastewater primary settling, pentavalent vanadium reduction, liming, air stripping, biochemical treatment, sterilization, filter-washing and water discharging. A wastewater buffer pool is arranged at the front end, and wastewater collected by a system converges to an outdoor sewage pipe through an indoor drainage ditch, then is discharged into the wastewater buffer pool, is subjected to wastewater treatment later, and then is recycled to the cleaning procedure after reaching the standard; in this way, zero discharging and recycling of wastewater are achieved, economization and environment protection are realized, cost input of enterprises is reduced greatly, and economic and social benefits of enterprises are increased.
Description
Technical field
The present invention relates to Waste Water From Fire Power Plant process, resource recycling, energy-conserving and environment-protective technical field, especially relate to a kind of thermal power plant denitrating catalyst regenerative wastewater zero discharge treatment new technology.
Background technology
Thermal power plant regenerating flue gas denitrifying catalyst waste water mainly has a following features: 1, waste water has suspension content height, COD, vanadate content is high, pH value is low water quality characteristics；2, containing part heavy metal in waste water；3, under normal operating conditions, ammonia nitrogen in waste water and total nitrogen content relatively low (＜ 10mg/l), but do not exclude the presence of ammonia nitrogen (100-200mg/l) and the problem of total nitrogen content (200-300mg/l) gap impact；Although 4, waste water COD content is high, laboratory is tested, and the biodegradability of waste water is not so good.Wherein, the main polluted factors of regenerative wastewater includes SS, heavy metal, CODcr, nitrogen, phosphorus etc..
Therefore for the problems referred to above, spy of the present invention provides a kind of new technical scheme.
Summary of the invention
It is an object of the invention to provide a kind of thermal power plant denitrating catalyst regenerative wastewater zero discharge treatment new technology, by to first heavy, reduction, the liming of 5 valency vanadium of waste water, add alkali clarification, stripping, pH regulator, precipitation after, after the operation process such as biochemical treatment, sterilization, sand filtration are up to standard, fully recovering is to matting, realize the zero-emission of waste water, cost-effective input.
The present invention is directed to above-mentioned technological deficiency be the technical scheme is that
A kind of thermal power plant denitrating catalyst regenerative wastewater zero discharge treatment new technology, comprises the following steps:
A: respectively the waste water that early-stage rainwater collecting pit and accident emergency pond produce is converged into waste water Buffer Pool, waste water in waste water Buffer Pool is introduced into preliminary sedimentation tank and carries out pretreatment, pretreatment time is >=6h, and the precipitation that pretreatment produces is transported to chamber filter press and processes further；
B: waste water after preliminary sedimentation tank is pretreated in step a introduces reduction pond, adds FeSO4 solution in reduction pond, in acid condition, pentavalent vanadium is reduced to trivalent vanadium, and the recovery time is 30-60min；
C: waste water after reduction treatment in step b introduces reaction depositing reservoir, add Calx being neutralized to wastewater pH in reaction depositing reservoir is about 10, V after major part heavy metal ion and reduction in waste water3+Forming precipitation, the precipitation that precipitation is transported in chamber filter press generate with preliminary sedimentation tank carries out solid-liquid separation process and forms mud cake；
D: by step c through precipitation removal process after waste water introduce three grades of stripping towers carry out advanced treating, continuing to add alkali to pH in waste water is 11, the heavy metal ion in waste water and reduction after V3+Being removed by the degree of depth, stripping time is 2-3h；
E: the waste water after advanced treating in step d is introduced neutralization pond+biological nutrition liquid pool, adding hydrochloric acid regulation wastewater pH in neutralization pond is 1h to 6-9, the COD content in degrading waste water, time；
F: the waste water after step e degradation treatment is introduced to biomembrane processor, and biomembrane processor film water outlet introducing ultraviolet ray disinfector is carried out sterilization treatment；
G: by relaying water tank, middle water after sterilization treatment in step f is introduced multimedium air bump rinse operation little Chi, uses more medium filter, chamber-type press filter and chemicals dosing plant centering water to carry out filtering, solid-liquid separation and purified treatment；
H: by step g middle water after purified treatment by middle water tank water outlet, it is achieved the zero-emission of waste water.
Further, in step a, the pretreatment operation of the waste water in preliminary sedimentation tank is: add PAC, PAM and CaO in preliminary sedimentation tank so that the suspended substance removal in waste water.
Further, the Fe that in step b, reduction reaction produces3+As flocculating agent in step c, d.
Further, the response time in step c is less than 10min, and the sedimentation time is less than 6h.
Further, described in step d, the content of the advanced treating of three grades of stripping towers also includes ammonia nitrogen concentration, total nitrogen and turbidity.
Further, this technique also includes absorption tower, for described in absorption step d three grades of stripping tower stripping NH4OH out.
Further, in step g the job content of more medium filter include just washing, gas backwash and water backwash.
The invention has the beneficial effects as follows: front end of the present invention arranges a waste water Buffer Pool, the various waste water of systematic collection converge into outdoor sewage pipe through indoor drainage ditch, drain into waste water Buffer Pool, wastewater treatment process is entered behind buffered pond, by the first of waste water is sunk, the reduction of 5 valency vanadium, liming, add alkali clarification, stripping, pH regulator, after precipitation, through biochemical treatment, sterilization, the operations such as sand filtration process rear fully recovering up to standard to matting, realize zero-emission and the cycling and reutilization of waste water, economical environment-protective, the cost greatly reducing enterprise puts into, it is easy to improve economic benefit and the social benefit of enterprise.
Accompanying drawing explanation
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is present invention process FB(flow block).
Detailed description of the invention
In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, and this embodiment is only used for explaining the present invention, is not intended that the restriction to protection scope of the present invention.
A kind of thermal power plant denitrating catalyst regenerative wastewater zero discharge treatment new technology as shown in Figure 1, comprises the following steps:
A: respectively the waste water that early-stage rainwater collecting pit and accident emergency pond produce is converged into waste water Buffer Pool, waste water in waste water Buffer Pool is introduced into preliminary sedimentation tank and carries out pretreatment, pretreatment time is >=6h, and the precipitation that pretreatment produces is transported to chamber filter press and processes further；
B: waste water after preliminary sedimentation tank is pretreated in step a introduces reduction pond, adds FeSO4 solution in reduction pond, in acid condition, pentavalent vanadium is reduced to trivalent vanadium, and the recovery time is 30-60min；
C: waste water after reduction treatment in step b introduces reaction depositing reservoir, add Calx being neutralized to wastewater pH in reaction depositing reservoir is about 10, V after major part heavy metal ion and reduction in waste water3+Forming precipitation, the precipitation that precipitation is transported in chamber filter press generate with preliminary sedimentation tank carries out solid-liquid separation process and forms mud cake；
D: by step c through precipitation removal process after waste water introduce three grades of stripping towers carry out advanced treating, continuing to add alkali to pH in waste water is 11, the heavy metal ion in waste water and reduction after V3+Being removed by the degree of depth, stripping time is 2-3h；
E: the waste water after advanced treating in step d is introduced neutralization pond+biological nutrition liquid pool, adding hydrochloric acid regulation wastewater pH in neutralization pond is 1h to 6-9, the COD content in degrading waste water, time；
F: the waste water after step e degradation treatment is introduced to biomembrane processor, and biomembrane processor film water outlet introducing ultraviolet ray disinfector is carried out sterilization treatment；
G: by relaying water tank, middle water after sterilization treatment in step f is introduced multimedium air bump rinse operation little Chi, uses more medium filter, chamber-type press filter and chemicals dosing plant centering water to carry out filtering, solid-liquid separation and purified treatment；
H: by step g middle water after purified treatment by middle water tank water outlet, it is achieved the zero-emission of waste water.
In the present embodiment, in step a, the pretreatment operation of the waste water in preliminary sedimentation tank is: add PAC, PAM and CaO in preliminary sedimentation tank so that the suspended substance removal in waste water, the advanced treating follow-up for waste water creates conditions.
In the present embodiment, the Fe that in step b, reduction reaction produces3+As flocculating agent in step c, d, the material that reduction reaction generates is used for this technique, advantageously reduces process costs.
In the present embodiment, the response time in step c is less than 10min, and the sedimentation time is less than 6h, and after step c processes, the COD in waste water is reduced to 901.8 mg/l by 2750 mg/l.
In the present embodiment, in step d, the content of the advanced treating of three grades of stripping towers also includes ammonia nitrogen concentration, total nitrogen and turbidity, after pH value is 11, COD in waste water is reduced to 842.9 mg/l by 901.8 mg/l, and after it after stripping step, COD is down to 580.4 mg/l, ammonia nitrogen concentration is down to 1.0 mg/l by 2.5 mg/l, total nitrogen is down to 1.0 mg/l by 10 mg/l, and turbidity is down to 37NTU, and at this moment waste water COD concentration has already decreased to the load that biological treatment system can process.
In the present embodiment, this technique also includes absorption tower, three grades of stripping tower strippings NH4OH out in absorption step d so that the ammonia after waste water processes is absorbed removal, it is to avoid produce the secondary pollution of waste gas.
In the present embodiment, in step g the job content of more medium filter include just washing, gas backwash and water backwash, and filtering velocity is 8m/h, and just washing intensity is 3 l/m2S, gas backwash intensity is 15 l/m2S, water backwash intensity is 10l/m2S, uses multiple cleaning way, it is possible to significantly improve the diafiltration effect of middle water.
The invention has the beneficial effects as follows: front end of the present invention arranges a waste water Buffer Pool, the various waste water of systematic collection converge into outdoor sewage pipe through indoor drainage ditch, drain into waste water Buffer Pool, wastewater treatment process rear fully recovering up to standard is entered to matting behind buffered pond, realize zero-emission and the cycling and reutilization of waste water, economical environment-protective, the cost greatly reducing enterprise puts into, it is simple to improve economic benefit and the social benefit of enterprise.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (7)
1. a thermal power plant denitrating catalyst regenerative wastewater zero discharge treatment new technology, it is characterised in that: comprise the following steps:
A: respectively the waste water that early-stage rainwater collecting pit and accident emergency pond produce is converged into waste water Buffer Pool, waste water in waste water Buffer Pool is introduced into preliminary sedimentation tank and carries out pretreatment, pretreatment time is >=6h, and the precipitation that pretreatment produces is transported to chamber filter press and processes further；
B: waste water after preliminary sedimentation tank is pretreated in step a introduces reduction pond, adds FeSO4 solution in reduction pond, in acid condition, pentavalent vanadium is reduced to trivalent vanadium, and the recovery time is 30-60min；
C: waste water after reduction treatment in step b introduces reaction depositing reservoir, add Calx being neutralized to wastewater pH in reaction depositing reservoir is about 10, V after major part heavy metal ion and reduction in waste water3+Forming precipitation, the precipitation that precipitation is transported in chamber filter press generate with preliminary sedimentation tank carries out solid-liquid separation process and forms mud cake；
D: by step c through precipitation removal process after waste water introduce three grades of stripping towers carry out advanced treating, continuing to add alkali to pH in waste water is 11, the heavy metal ion in waste water and reduction after V3+Being removed by the degree of depth, stripping time is 2-3h；
E: the waste water after advanced treating in step d is introduced neutralization pond+biological nutrition liquid pool, adding hydrochloric acid regulation wastewater pH in neutralization pond is 1h to 6-9, the COD content in degrading waste water, time；
F: the waste water after step e degradation treatment is introduced to biomembrane processor, and biomembrane processor film water outlet introducing ultraviolet ray disinfector is carried out sterilization treatment；
G: by relaying water tank, middle water after sterilization treatment in step f is introduced multimedium air bump rinse operation little Chi, uses more medium filter, chamber-type press filter and chemicals dosing plant centering water to carry out filtering, solid-liquid separation and purified treatment；
H: by step g middle water after purified treatment by middle water tank water outlet, it is achieved the zero-emission of waste water.
A kind of thermal power plant the most according to claim 1 denitrating catalyst regenerative wastewater zero discharge treatment new technology, it is characterized in that: in step a, the pretreatment operation of the waste water in preliminary sedimentation tank is: in preliminary sedimentation tank, add PAC, PAM and CaO so that the suspended substance removal in waste water.
A kind of thermal power plant the most according to claim 1 denitrating catalyst regenerative wastewater zero discharge treatment new technology, it is characterised in that: the Fe that in step b, reduction reaction produces3+As flocculating agent in step c, d.
A kind of thermal power plant the most according to claim 1 denitrating catalyst regenerative wastewater zero discharge treatment new technology, it is characterised in that: the response time in step c is less than 10min, and the sedimentation time is less than 6h.
A kind of thermal power plant the most according to claim 1 denitrating catalyst regenerative wastewater zero discharge treatment new technology, it is characterised in that: step d
Described in the content of advanced treating of three grades of stripping towers also include ammonia nitrogen concentration, total nitrogen and turbidity.
A kind of thermal power plant the most according to claim 1 denitrating catalyst regenerative wastewater zero discharge treatment new technology, it is characterised in that: this technique also includes absorption tower, for described in absorption step d three grades of stripping tower stripping NH4OH out.
A kind of thermal power plant the most according to claim 1 denitrating catalyst regenerative wastewater zero discharge treatment new technology, it is characterised in that: in step g the job content of more medium filter include just washing, gas backwash and water backwash.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610422569.6A CN105906161A (en) | 2016-06-15 | 2016-06-15 | Novel process for thermal power plant denitration catalyst regeneration wastewater zero discharging treatment |
| PCT/CN2017/088419 WO2017215626A1 (en) | 2016-06-15 | 2017-06-15 | Novel waste water zero emission treatment process for denitration catalyst regeneration of thermal power plant |
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| CN201610422569.6A CN105906161A (en) | 2016-06-15 | 2016-06-15 | Novel process for thermal power plant denitration catalyst regeneration wastewater zero discharging treatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017215626A1 (en) * | 2016-06-15 | 2017-12-21 | 江苏海容热能环境工程有限公司 | Novel waste water zero emission treatment process for denitration catalyst regeneration of thermal power plant |
| WO2020000342A1 (en) * | 2018-06-29 | 2020-01-02 | 江苏海容热能环境工程有限公司 | Method for degrading small molecular organic matter in regenerated wastewater of waste flue gas denitration catalyst |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110865661A (en) * | 2019-12-04 | 2020-03-06 | 深圳市智水智能系统有限公司 | Wastewater level control system |
Citations (3)
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| US20120193295A1 (en) * | 2011-01-31 | 2012-08-02 | Rahul Shankar Bhaduri | Method for treating effluent waters |
| CN105152459A (en) * | 2015-07-21 | 2015-12-16 | 安徽省元琛环保科技有限公司 | Process for treating wastewater produced in regeneration of SCR denitration catalyst |
| CN105384296A (en) * | 2015-12-09 | 2016-03-09 | 大唐国际化工技术研究院有限公司 | System and method for processing wastewater generated during regeneration of SCR denitration catalyst |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5637053A (en) * | 1979-09-03 | 1981-04-10 | Kawasaki Heavy Ind Ltd | Regenerating treatment of denitrificating catalyst |
| CN104261585A (en) * | 2014-09-19 | 2015-01-07 | 湖南淼鑫环保科技有限公司 | Method for treating metallurgy wastewater and recycling resources |
| CN104528893B (en) * | 2014-12-05 | 2016-06-22 | 华南理工大学 | A kind of electrochemical process for treating of regenerating flue gas denitrifying catalyst technique waste water |
| CN105384279B (en) * | 2015-12-09 | 2019-04-05 | 大唐国际化工技术研究院有限公司 | A kind of processing system and processing method of the waste water that SCR denitration regeneration generates |
| CN105906161A (en) * | 2016-06-15 | 2016-08-31 | 江苏海容热能环境工程有限公司 | Novel process for thermal power plant denitration catalyst regeneration wastewater zero discharging treatment |
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2016
- 2016-06-15 CN CN201610422569.6A patent/CN105906161A/en active Pending
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- 2017-06-15 WO PCT/CN2017/088419 patent/WO2017215626A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120193295A1 (en) * | 2011-01-31 | 2012-08-02 | Rahul Shankar Bhaduri | Method for treating effluent waters |
| CN105152459A (en) * | 2015-07-21 | 2015-12-16 | 安徽省元琛环保科技有限公司 | Process for treating wastewater produced in regeneration of SCR denitration catalyst |
| CN105384296A (en) * | 2015-12-09 | 2016-03-09 | 大唐国际化工技术研究院有限公司 | System and method for processing wastewater generated during regeneration of SCR denitration catalyst |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017215626A1 (en) * | 2016-06-15 | 2017-12-21 | 江苏海容热能环境工程有限公司 | Novel waste water zero emission treatment process for denitration catalyst regeneration of thermal power plant |
| WO2020000342A1 (en) * | 2018-06-29 | 2020-01-02 | 江苏海容热能环境工程有限公司 | Method for degrading small molecular organic matter in regenerated wastewater of waste flue gas denitration catalyst |
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| WO2017215626A1 (en) | 2017-12-21 |
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