CN104326600A - Method and system for purifying hydrochloric acid waste liquid with zero emission of waste water - Google Patents
Method and system for purifying hydrochloric acid waste liquid with zero emission of waste water Download PDFInfo
- Publication number
- CN104326600A CN104326600A CN201410618425.9A CN201410618425A CN104326600A CN 104326600 A CN104326600 A CN 104326600A CN 201410618425 A CN201410618425 A CN 201410618425A CN 104326600 A CN104326600 A CN 104326600A
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- Prior art keywords
- waste
- waste water
- collection pond
- liquid
- liquid level
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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
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
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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
- C02F1/66—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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention relates to a method and system for purifying hydrochloric acid waste liquid with zero emission of waste water. A circulation pipeline for air purging of sludge of a filter press is increased on the basis of the existing purifying system, and the circulation pipeline is connected with a sedimentation tank; and a waste liquid lifting pump is added to connect a waste liquid collection tank with a neutralization reaction tank. The method and system provided by the invention have the following beneficial effects that the zero emission of waste water produced in the purification process of the hydrochloric acid waste liquid can be realized, thereby being particularly suitable for enterprises without waste water treatment stations and the enterprises which have the waste water treatment stations, but have no ammonia nitrogen waste water treatment processes. Ammonia nitrogen and chlorine ions in the waste water in the waste liquid collection tank can be recycled, so that the dosing amount of ammonia water is further reduced, the recovery rate of hydrochloric acid is increased, an environment is protected and the waste water is also effectively utilized.
Description
Technical field
The present invention relates to iron and steel and chemical technology field, concrete one relates to wastewater zero discharge hydrochloride waste purifying method and system.
Background technology
At present, various cold rolling steel are all take hot-strip as the deep processed product of raw material, and various hot-strip is lower than in fusing point high temperature rolling process, and its surface forms the not only crisp but also hard oxide compound of one deck.Hot-strip, before carrying out cold rolling processing, must remove steel surface oxide compound, usually carries out pickling.Domestic and international most hot-strip pickling adopts chlorohydric acid pickling usually, reaches certain density hydrochloride waste and passes through purifying regeneration.
There is following problem in tradition purification treatment process of waste liquor of hydrochloric acid: the sewage that the mud of pressure filter pressurized air purging discharge, pressure filter water flushing effluent discharge, filter press filtrate, terrace flushing produce and accidental discharge waste water drain into waste water processing station after all being collected by collecting tank.Pressure filter purges, rinse the mud and sewage of discharging, the flushing of filter press filtrate, terrace and accidental discharge liquid are all containing ammoniacal liquor, and conventional cold rolling wastewater treatment station does not have NH_3-N treating technique, therefore its effluent index is considerably beyond the emission standard of country to total nitrogen, ammonia nitrogen, can only by dilution to reach emission standard.Waste water processing station increases new treatment process, will bring huge investment and running cost, thus has increased the weight of business burden.
Therefore be necessary to design a kind of wastewater zero discharge hydrochloride waste purifying method and system, to overcome the problems referred to above.
Summary of the invention
The object of the invention is to the defect overcoming prior art, a kind of wastewater zero discharge hydrochloride waste purifying method and system are provided, realize hydrochloride waste purification system wastewater zero discharge.
The present invention is achieved in that
The invention provides a kind of wastewater zero discharge hydrochloride waste purifying method, comprise the following steps:
Hydrochloride waste after spent acid basin, dissolution reactor, neutralization reaction tank and settling tank process, is purified liquid and mud successively, and scavenging solution enters overflowing liquid basin, and mud enters pressure filter process;
Pressure filter process obtains filtrate and filter cake, described filter cake outward transport, and described filtrate enters waste collection pond; Pressure filter after process is purged by pressurized air and obtains purging mud, then obtains flushing waste water through clear water flushing, and described purging mud returns settling tank reprocessing, and described flushing waste water enters waste collection pond;
Terrace rinses sewage, accidental discharge waste water enters waste collection pond;
The various waste water that waste collection pond is collected turn back to neutralization reaction tank through waste liquid lift pump and carry out reprocessing.
Further, described waste collection pond is underground type collecting tank, and is provided with liquid level detection system; Liquid level detection system detects the liquid level in waste collection pond, thus control waste liquid lift pump opens pump or termination of pumping.
Further, described liquid level detection system comprises Level Detection element and level control unit, and described level control unit comprises the pilot circuit that the described waste liquid lift pump of liquid level data gathering device, central processing unit and control opens pump or termination of pumping; Described liquid level data gathering device is connected with Level Detection element and central processing unit respectively, and described central processing unit is connected with pilot circuit.
The present invention also provides a kind of wastewater zero discharge hydrochloride waste purification system, comprises spent acid basin, dissolution reactor, neutralization reaction tank, settling tank, pressure filter, overflowing liquid basin and waste collection pond.Described spent acid basin is connected with dissolution reactor with well heater by lift pump, described dissolution reactor is connected with neutralization reaction tank by water cooler, described neutralization reaction tank is connected with settling tank and is provided with the passage that feeds intake of pressurized air, ammoniacal liquor and flocculation agent, described settling tank is connected with overflowing liquid basin and is connected with pressure filter by slush pump, described pressure filter is connected with waste collection pond, and described waste collection pond is provided with the collection channel of filtrate, flushing waste water, terrace flushing sewage, accidental discharge waste water.Described pressure filter is also provided with the circulation duct purging mud, and the circulation duct of described purging mud is connected with settling tank; Described waste collection pond is connected with neutralization reaction tank by waste liquid lift pump.
Further, described waste collection pond is underground type collecting tank, and is provided with liquid level detection system.
Further, described liquid level detection system comprises Level Detection element and level control unit, and described level control unit comprises the pilot circuit that the described waste liquid lift pump of liquid level data gathering device, central processing unit and control opens pump or termination of pumping; Described liquid level data gathering device is connected with Level Detection element and central processing unit respectively, and described central processing unit is connected with pilot circuit.
The present invention has following beneficial effect: the purging mud that the compressed air purge of pressure filter goes out is back to settling tank by pipeline; Filter press filtrate, pressure filter through clear water rinse discharge flushing waste water, terrace rinse sewage, accidental discharge waste water all by waste collection pond collection after, with being pumped to neutralization reaction tank; This process system can realize the wastewater zero discharge produced in hydrochloride waste scavenging process, is particularly useful for without waste water processing station and has waste water processing station but without the enterprise of Ammonia-nitrogen wastewater treatment technology.Can the ammonia nitrogen of waste water and chlorion in reuse waste collection pond, thus reduce ammoniacal liquor dosage, increase the rate of recovery of hydrochloric acid, both protection of the environments, waste water is got back and is effectively utilized.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The process flow sheet of the wastewater zero discharge hydrochloride waste purifying method that Fig. 1 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope of protection of the invention.
As Fig. 1, the embodiment of the present invention provides a kind of wastewater zero discharge hydrochloride waste purifying method, comprises the following steps:
S1: hydrochloride waste after spent acid basin, dissolution reactor, neutralization reaction tank and settling tank process, is purified liquid and mud successively, and scavenging solution enters overflowing liquid basin, and mud enters pressure filter process;
S2: pressure filter process obtains filtrate and filter cake, described filter cake outward transport, described filtrate enters waste collection pond; Pressure filter after process is purged by pressurized air and obtains purging mud, then obtains flushing waste water through clear water flushing, and described purging mud returns settling tank reprocessing, and described flushing waste water enters waste collection pond;
S3: terrace rinses sewage, accidental discharge waste water enters waste collection pond;
S4: the various waste water that waste collection pond is collected turn back to neutralization reaction tank through waste liquid lift pump and carry out reprocessing.
In the wastewater zero discharge hydrochloride waste purifying method that the embodiment of the present invention provides, preferably, described waste collection pond is underground type collecting tank, and is provided with liquid level detection system; Liquid level detection system detects the liquid level in waste collection pond, thus control waste liquid lift pump opens pump or termination of pumping.
As Fig. 1, the embodiment of the present invention also provides a kind of wastewater zero discharge hydrochloride waste purification system, comprises spent acid basin, dissolution reactor, neutralization reaction tank, settling tank, pressure filter, overflowing liquid basin and waste collection pond.Described spent acid basin is connected with dissolution reactor with well heater by lift pump, described dissolution reactor is connected with neutralization reaction tank by water cooler, described neutralization reaction tank is connected with settling tank and is provided with the passage that feeds intake of pressurized air, ammoniacal liquor and flocculation agent, described settling tank is connected with overflowing liquid basin and is connected with pressure filter by slush pump, described pressure filter is connected with waste collection pond, and described waste collection pond is provided with the collection channel of filtrate, flushing waste water, terrace flushing sewage, accidental discharge waste water.Described pressure filter is also provided with the circulation duct purging mud, and the circulation duct of described purging mud is connected with settling tank; Described waste collection pond is connected with neutralization reaction tank by waste liquid lift pump.In the embodiment of the present invention, flocculation agent adopts FeCl
3, settling tank is also provided with the passage that feeds intake of coagulant aids; The purging mud that the compressed air purge of pressure filter produces enters settling tank by circulation duct, pressure filter rinses through clear water the flushing waste water produced and enters waste collection pond by pipeline, terrace rinses sewage, accidental discharge waste water collects rear run by gravity to waste collection pond by open drain, various waste water in waste collection pond enter neutralization reaction tank by waste liquid lift pump, realize the wastewater zero discharge of hydrochloride waste purification system.
As a kind of preferred structure of the present embodiment, described waste collection pond is underground type collecting tank, and is provided with liquid level detection system.Described liquid level detection system comprises Level Detection element and level control unit, and described level control unit comprises the pilot circuit that the described waste liquid lift pump of liquid level data gathering device, central processing unit and control opens pump or termination of pumping; Described liquid level data gathering device is connected with Level Detection element and central processing unit respectively, and described central processing unit is connected with pilot circuit.By arranging liquid level detection system, by the liquid level in Level Detection element testing waste collection pond, be transferred to central processing unit by after liquid level data gathering device image data, control waste liquid lift pump by pilot circuit after central processing unit processing data and automatically open pump or termination of pumping.Particularly, this central processing unit can be the Controlling System of hydrochloride waste cleaning section, namely by the laggard row relax of data of the Controlling System receiving liquid bit data gathering device of hydrochloride waste cleaning section, then pump or termination of pumping is automatically opened by pilot circuit control waste liquid lift pump.This mode does not need other central processing unit, and can share the data of cold-rolling process system, and structure is simple but can realize accurate control.
The embodiment of the present invention has following beneficial effect: the purging mud that the compressed air purge of pressure filter produces is back to settling tank by pipeline; Filter press filtrate, pressure filter through clear water rinse discharge flushing waste water, terrace rinse sewage, accidental discharge waste water all by waste collection pond collection after, with being pumped to neutralization reaction tank; This process system can realize the wastewater zero discharge produced in hydrochloride waste scavenging process, is particularly useful for without waste water processing station and has waste water processing station but without the enterprise of Ammonia-nitrogen wastewater treatment technology.Can the ammonia nitrogen of waste water and chlorion in reuse waste collection pond, thus reduce ammoniacal liquor dosage, increase the rate of recovery of hydrochloric acid, both protection of the environments, waste water is got back and is effectively utilized.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a wastewater zero discharge hydrochloride waste purifying method, comprises the following steps:
Hydrochloride waste after spent acid basin, dissolution reactor, neutralization reaction tank and settling tank process, is purified liquid and mud successively, and scavenging solution enters overflowing liquid basin, and mud enters pressure filter process;
Pressure filter process obtains filtrate and filter cake, described filter cake outward transport, and described filtrate enters waste collection pond; Pressure filter after process is purged by pressurized air and obtains purging mud, then obtains flushing waste water through clear water flushing, and described purging mud returns settling tank reprocessing, and described flushing waste water enters waste collection pond;
Terrace rinses sewage, accidental discharge waste water enters waste collection pond;
The various waste water that waste collection pond is collected turn back to neutralization reaction tank through waste liquid lift pump and carry out reprocessing.
2. wastewater zero discharge hydrochloride waste purifying method according to claim 1, is characterized in that: described waste collection pond is underground type collecting tank, and is provided with liquid level detection system; Liquid level detection system detects the liquid level in waste collection pond, thus control waste liquid lift pump opens pump or termination of pumping.
3. wastewater zero discharge hydrochloride waste purifying method according to claim 2, it is characterized in that: described liquid level detection system comprises Level Detection element and level control unit, described level control unit comprises the pilot circuit that the described waste liquid lift pump of liquid level data gathering device, central processing unit and control opens pump or termination of pumping; Described liquid level data gathering device is connected with Level Detection element and central processing unit respectively, and described central processing unit is connected with pilot circuit.
4. a wastewater zero discharge hydrochloride waste purification system, comprise spent acid basin, dissolution reactor, neutralization reaction tank, settling tank, pressure filter, overflowing liquid basin and waste collection pond, described spent acid basin is connected with dissolution reactor with well heater by lift pump, described dissolution reactor is connected with neutralization reaction tank by water cooler, described neutralization reaction tank is connected with settling tank and is provided with pressurized air, the passage that feeds intake of ammoniacal liquor and flocculation agent, described settling tank is connected with overflowing liquid basin and is connected with pressure filter by slush pump, described pressure filter is connected with waste collection pond, described waste collection pond is provided with filtrate, flushing waste water, terrace rinses sewage, the collection channel of accidental discharge waste water, it is characterized in that: described pressure filter is also provided with the circulation duct purging mud, the circulation duct of described purging mud is connected with settling tank, described waste collection pond is connected with neutralization reaction tank by waste liquid lift pump.
5. wastewater zero discharge hydrochloride waste purification system according to claim 4, is characterized in that: described waste collection pond is underground type collecting tank, and is provided with liquid level detection system.
6. wastewater zero discharge hydrochloride waste purification system according to claim 5, it is characterized in that: described liquid level detection system comprises Level Detection element and level control unit, described level control unit comprises the pilot circuit that the described waste liquid lift pump of liquid level data gathering device, central processing unit and control opens pump or termination of pumping; Described liquid level data gathering device is connected with Level Detection element and central processing unit respectively, and described central processing unit is connected with pilot circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410618425.9A CN104326600A (en) | 2014-11-06 | 2014-11-06 | Method and system for purifying hydrochloric acid waste liquid with zero emission of waste water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410618425.9A CN104326600A (en) | 2014-11-06 | 2014-11-06 | Method and system for purifying hydrochloric acid waste liquid with zero emission of waste water |
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| CN104326600A true CN104326600A (en) | 2015-02-04 |
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| CN201410618425.9A Pending CN104326600A (en) | 2014-11-06 | 2014-11-06 | Method and system for purifying hydrochloric acid waste liquid with zero emission of waste water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105664588A (en) * | 2016-03-31 | 2016-06-15 | 广西大都混凝土集团有限公司 | Sewage treatment system for concrete factory and water treatment method of sewage treatment system |
| CN108043108A (en) * | 2018-02-08 | 2018-05-18 | 福建欣宇卫浴科技股份有限公司 | A kind of solid-liquid separation system |
| CN108128874A (en) * | 2017-12-25 | 2018-06-08 | 湖南华菱涟钢薄板有限公司 | A kind of ammonia nitrogen processing method in flat cold-rolled sheet waste water |
| WO2022247111A1 (en) * | 2021-05-28 | 2022-12-01 | 中冶南方工程技术有限公司 | Hydrochloric acid pickling solution purification and sludge treatment process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105664588A (en) * | 2016-03-31 | 2016-06-15 | 广西大都混凝土集团有限公司 | Sewage treatment system for concrete factory and water treatment method of sewage treatment system |
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| CN108043108A (en) * | 2018-02-08 | 2018-05-18 | 福建欣宇卫浴科技股份有限公司 | A kind of solid-liquid separation system |
| WO2022247111A1 (en) * | 2021-05-28 | 2022-12-01 | 中冶南方工程技术有限公司 | Hydrochloric acid pickling solution purification and sludge treatment process |
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Application publication date: 20150204 |