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WO2017215626A1 - Nouveau procédé de traitement à émission nulle d'eaux usées pour la régénération d'un catalyseur de dénitration d'une centrale thermique - Google Patents

Nouveau procédé de traitement à émission nulle d'eaux usées pour la régénération d'un catalyseur de dénitration d'une centrale thermique Download PDF

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Publication number
WO2017215626A1
WO2017215626A1 PCT/CN2017/088419 CN2017088419W WO2017215626A1 WO 2017215626 A1 WO2017215626 A1 WO 2017215626A1 CN 2017088419 W CN2017088419 W CN 2017088419W WO 2017215626 A1 WO2017215626 A1 WO 2017215626A1
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WIPO (PCT)
Prior art keywords
wastewater
tank
treatment
waste water
thermal power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/088419
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English (en)
Chinese (zh)
Inventor
蒋路漫
周振
仲旭
胡敏娴
张伟
刘冬梅
陈伟伟
张春建
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Hai Rong Thermal Energy Environmental Engineering Co Ltd
Original Assignee
Jiangsu Hai Rong Thermal Energy Environmental Engineering Co Ltd
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Filing date
Publication date
Application filed by Jiangsu Hai Rong Thermal Energy Environmental Engineering Co Ltd filed Critical Jiangsu Hai Rong Thermal Energy Environmental Engineering Co Ltd
Publication of WO2017215626A1 publication Critical patent/WO2017215626A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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—Ultraviolet 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
    • 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

Definitions

  • the invention relates to the technical field of waste water treatment, resource recycling and utilization, energy conservation and environmental protection of thermal power plants, in particular to a new process for zero discharge treatment of denitration catalyst regeneration wastewater in a thermal power plant.
  • the flue gas denitration catalyst regeneration wastewater of thermal power plant mainly has the following characteristics: 1.
  • the wastewater has the characteristics of high suspended solid content, high COD, high vanadate content and low PH value; 2.
  • the wastewater contains some heavy metals; 3.
  • the ammonia nitrogen and total nitrogen content of wastewater are lower ( ⁇ 10mg/l), but the problem of interstitial impact of ammonia nitrogen (100-200mg/l) and total nitrogen content (200-300mg/l) is not excluded; 4.
  • Wastewater Although the COD content is high, laboratory tests, the biodegradability of wastewater is not very good.
  • the main pollution factors of recycled wastewater include SS, heavy metals, CODcr, nitrogen, phosphorus and so on.
  • the present invention provides a new technical solution.
  • the object of the present invention is to provide a new process for zero discharge treatment of denitration catalyst regeneration wastewater in a thermal power plant, through primary sedimentation of wastewater, reduction of pentavalent vanadium, clarification with lime, addition of alkali clarification, stripping, pH adjustment, precipitation After the treatment, such as biochemical treatment, disinfection, sand filtration, etc., all of them are recycled to the cleaning process to achieve zero discharge of wastewater and save cost.
  • a new process for zero-emission treatment of denitration catalyst regeneration wastewater in thermal power plants including The following steps:
  • the wastewater from the initial rainwater collection tank and the accident emergency pool is separately flowed to the wastewater buffer pool, and the wastewater in the wastewater buffer pool is introduced into the primary sedimentation tank for pretreatment.
  • the pretreatment time is ⁇ 6h, and the pretreatment produced precipitate is transported to The box filter press is further processed;
  • step b introducing the wastewater pretreated in the primary sedimentation tank in step a into the reduction tank, adding FeSO4 solution to the reduction tank, and reducing the vanadium vanadium to trivalent vanadium under acidic conditions, the reduction time is 30-60 min;
  • step c The wastewater after the reduction treatment in step b is introduced into the reaction clarification tank, and lime is added to the reaction clarification tank until the pH of the wastewater is about 10, and most of the heavy metal ions in the wastewater and the reduced V 3+ form a precipitate, and the precipitate is precipitated. Delivered to the tank filter press and the precipitate formed by the primary settling tank for solid-liquid separation treatment to form a mud cake;
  • step d the wastewater after the precipitation removal in step c is introduced into the tertiary stripping tower for advanced treatment, and the alkali is continuously added to the wastewater to pH 11, and the heavy metal ions in the wastewater and the reduced V 3+ are deeply removed.
  • the stripping time is 2-3h;
  • step e introducing the wastewater treated in step d into the neutralization tank + biological nutrient solution pool, adding hydrochloric acid to the neutralization tank to adjust the pH of the wastewater to 6-9, and degrading the COD content in the wastewater for 1 hour;
  • step f introducing the wastewater degraded in step e to the biofilm processor, and introducing the effluent of the biofilm processor membrane into the ultraviolet sterilizer for sterilization;
  • step f introducing the sterilized water in step f into the multi-media air scrubbing tank through the relay water tank, and filtering, solid-liquid separation, and solid water using a multi-media filter, a chamber filter press, and a dosing device; Purification treatment
  • the pretreatment operation of the wastewater in the pre-sinking tank in the step a is: adding PAC, PAM and CaO to the pre-precipitation tank to remove the suspended solids in the wastewater.
  • Fe 3+ produced by the reduction reaction in the step b is used as a coagulant in the steps c and d.
  • reaction time in the step c is not more than 10 min, and the precipitation time is not more than 6 h.
  • the content of the deep treatment of the three-stage stripping tower in the step d further includes ammonia nitrogen concentration, total nitrogen and turbidity.
  • the process further includes an absorption tower for absorbing the NH4OH blown off by the tertiary stripping column in step d.
  • the working contents of the multi-media filter in the step g include positive washing, gas back washing and water back washing.
  • the invention has the beneficial effects that: a waste water buffer pool is arranged at the front end of the invention, and various waste water collected by the system is discharged to the outdoor sewage pipe through the indoor drainage ditch, discharged to the wastewater buffer pool, and after entering the wastewater treatment process through the buffer pool, the wastewater is passed through the wastewater treatment process.
  • Figure 1 is a block diagram of the process flow of the present invention.
  • a new process for zero-emission treatment of denitration catalyst regeneration wastewater in a thermal power plant as shown in FIG. 1 includes the following steps:
  • the wastewater from the initial rainwater collection tank and the accident emergency pool is separately flowed to the wastewater buffer pool, and the wastewater in the wastewater buffer pool is introduced into the primary sedimentation tank for pretreatment.
  • the pretreatment time is ⁇ 6h, and the pretreatment produced precipitate is transported to The box filter press is further processed;
  • step b introducing the wastewater pretreated in the primary sedimentation tank in step a into the reduction tank, adding FeSO4 solution to the reduction tank, and reducing the vanadium vanadium to trivalent vanadium under acidic conditions, the reduction time is 30-60 min;
  • step c The wastewater after the reduction treatment in step b is introduced into the reaction clarification tank, and lime is added to the reaction clarification tank until the pH of the wastewater is about 10, and most of the heavy metal ions in the wastewater and the reduced V 3+ form a precipitate, and the precipitate is precipitated. Delivered to the tank filter press and the precipitate formed by the primary settling tank for solid-liquid separation treatment to form a mud cake;
  • step d the wastewater after the precipitation removal in step c is introduced into the tertiary stripping tower for advanced treatment, and the alkali is continuously added to the wastewater to pH 11, and the heavy metal ions in the wastewater and the reduced V 3+ are deeply removed.
  • the stripping time is 2-3h;
  • step e introducing the wastewater after the deep treatment in step d into the neutralization tank + biological nutrient solution pool, Adding hydrochloric acid to the neutralization tank to adjust the pH of the wastewater to 6-9, and degrading the COD content in the wastewater for 1 hour;
  • step f introducing the wastewater degraded in step e to the biofilm processor, and introducing the effluent of the biofilm processor membrane into the ultraviolet sterilizer for sterilization;
  • step f introducing the sterilized water in step f into the multi-media air scrubbing tank through the relay water tank, and filtering, solid-liquid separation, and solid water using a multi-media filter, a chamber filter press, and a dosing device; Purification treatment
  • the pretreatment operation of the wastewater in the pre-sinking tank in the step a is: adding PAC, PAM and CaO to the pre-sinking tank to remove the suspended solids in the wastewater, thereby creating conditions for the subsequent deep treatment of the wastewater.
  • the Fe 3+ produced by the reduction reaction in the step b is used as a coagulant in the steps c and d, and the substance formed by the reduction reaction is used in the process, which is advantageous in reducing the process cost.
  • the reaction time in the step c is not more than 10 min, and the precipitation time is not more than 6 h.
  • the COD in the wastewater is reduced from 2750 mg/l to 901.8 mg/l.
  • the content of the deep treatment of the tertiary stripping tower in step d further includes ammonia nitrogen concentration, total nitrogen and turbidity.
  • the pH value is 11
  • the COD in the wastewater is reduced from 901.8 mg/l to 842.9 mg. /l
  • the COD decreased to 580.4mg/l
  • the ammonia nitrogen concentration decreased from 2.5mg/l to 1.0mg/l
  • the total nitrogen decreased from 10mg/l to 1.0mg/l.
  • the turbidity drops to 37 NTU, at which point the wastewater COD concentration has been reduced to the load that the biological treatment system can handle.
  • the process further comprises an absorption tower for absorbing the NH4OH blown off by the three-stage stripping tower in the step d, so that the ammonia gas after the wastewater treatment is absorbed and removed, thereby avoiding secondary pollution of the exhaust gas.
  • the working contents of the multi-media filter in the step g include positive washing, gas back washing and water back washing, and the filtering speed is 8 m/h, the washing power is 3 l/m 2 s, and the gas backwashing strength is It is 15l/m 2 s, the water backwashing strength is 10l/m 2 s, and various cleaning methods can be used to significantly improve the filtration effect of the water.
  • the invention has the beneficial effects that: a waste water buffer pool is arranged at the front end of the invention, and various waste water collected by the system is merged into the outdoor sewage pipe through the indoor drainage ditch, discharged to the wastewater buffer pool, and after entering the wastewater treatment process, all the wastewater is processed after reaching the standard through the buffer pool. It can be used in the cleaning process to achieve zero discharge and recycling of wastewater, saving environmental protection, greatly reducing the cost of the enterprise, and improving the economic and social benefits of the enterprise.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Un nouveau procédé de traitement à émission nulle d'eaux usées pour la régénération de catalyseur de dénitration d'une centrale thermique, comprenant les étapes suivantes : a. décantation préliminaire des eaux usées ; b. réduction du vanadium pentavalent ; c. clarification par ajout de chaux ; d. extraction par l'air ; e. traitement biochimique ; f. stérilisation ; g. filtration et lavage ; et h. évacuation d'eau. Dans le procédé, un bassin de tampon d'eaux usées est disposé à l'extrémité avant, les eaux usées collectées par le système convergent vers un tuyau d'égout extérieur au moyen de tranchées de drainage intérieures, puis sont déchargées dans le bassin de tampon d'eaux usées, sont soumises au flux de traitement des eaux usées après le bassin de tampon, et sont recyclées dans la procédure de nettoyage après avoir atteint le norme, de façon à obtenir une émission nulle et un recyclage des eaux usées, ce qui permet d'obtenir une économie et une protection de l'environnement, et de réduire considérablement le coût pour les entreprises, et d'améliorer les avantages économiques et sociaux des entreprises.
PCT/CN2017/088419 2016-06-15 2017-06-15 Nouveau procédé de traitement à émission nulle d'eaux usées pour la régénération d'un catalyseur de dénitration d'une centrale thermique Ceased WO2017215626A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610422569.6A CN105906161A (zh) 2016-06-15 2016-06-15 一种火力发电厂脱硝催化剂再生废水零排放处理新工艺
CN201610422569.6 2016-06-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110865661A (zh) * 2019-12-04 2020-03-06 深圳市智水智能系统有限公司 一种废水水位控制系统
CN111499120A (zh) * 2020-05-27 2020-08-07 大唐南京环保科技有限责任公司 一种脱硝催化剂再生废水的处理系统及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105906161A (zh) * 2016-06-15 2016-08-31 江苏海容热能环境工程有限公司 一种火力发电厂脱硝催化剂再生废水零排放处理新工艺
WO2020000342A1 (fr) * 2018-06-29 2020-01-02 江苏海容热能环境工程有限公司 Procédé de dégradation de matière organique de faible poids moléculaire dans des eaux usées régénérées de catalyseur de dénitration de gaz de fumée résiduaire

Citations (6)

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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 (zh) * 2014-09-19 2015-01-07 湖南淼鑫环保科技有限公司 冶金污水处理及资源回收利用的方法
CN104528893A (zh) * 2014-12-05 2015-04-22 华南理工大学 一种烟气脱硝催化剂再生工艺废水的电化学处理方法
CN105384296A (zh) * 2015-12-09 2016-03-09 大唐国际化工技术研究院有限公司 一种scr脱硝催化剂再生产生的废水的处理系统及处理方法
CN105384279A (zh) * 2015-12-09 2016-03-09 大唐国际化工技术研究院有限公司 一种scr脱硝催化剂再生产生的废水的处理系统及处理方法
CN105906161A (zh) * 2016-06-15 2016-08-31 江苏海容热能环境工程有限公司 一种火力发电厂脱硝催化剂再生废水零排放处理新工艺

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US20120193295A1 (en) * 2011-01-31 2012-08-02 Rahul Shankar Bhaduri Method for treating effluent waters
CN105152459B (zh) * 2015-07-21 2017-09-29 安徽元琛环保科技股份有限公司 一种再生scr脱硝催化剂废水处理工艺

Patent Citations (6)

* Cited by examiner, † Cited by third party
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 (zh) * 2014-09-19 2015-01-07 湖南淼鑫环保科技有限公司 冶金污水处理及资源回收利用的方法
CN104528893A (zh) * 2014-12-05 2015-04-22 华南理工大学 一种烟气脱硝催化剂再生工艺废水的电化学处理方法
CN105384296A (zh) * 2015-12-09 2016-03-09 大唐国际化工技术研究院有限公司 一种scr脱硝催化剂再生产生的废水的处理系统及处理方法
CN105384279A (zh) * 2015-12-09 2016-03-09 大唐国际化工技术研究院有限公司 一种scr脱硝催化剂再生产生的废水的处理系统及处理方法
CN105906161A (zh) * 2016-06-15 2016-08-31 江苏海容热能环境工程有限公司 一种火力发电厂脱硝催化剂再生废水零排放处理新工艺

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110865661A (zh) * 2019-12-04 2020-03-06 深圳市智水智能系统有限公司 一种废水水位控制系统
CN111499120A (zh) * 2020-05-27 2020-08-07 大唐南京环保科技有限责任公司 一种脱硝催化剂再生废水的处理系统及方法

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