CN103833155A - Chromium-containing wastewater treatment technology - Google Patents
Chromium-containing wastewater treatment technology Download PDFInfo
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- CN103833155A CN103833155A CN201210471314.0A CN201210471314A CN103833155A CN 103833155 A CN103833155 A CN 103833155A CN 201210471314 A CN201210471314 A CN 201210471314A CN 103833155 A CN103833155 A CN 103833155A
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Abstract
A chromium-containing wastewater treatment technology is characterized in that precipitation separation of chromium-containing wastewater generated in a chrome tanning operation is carried out under a certain acidity, a chromium-free supernatant is reused in a liming workshop section, chromium ions form a solid substance with other precipitates, separation filtration is carried out to remove impurities, and acid dissolution ageing reaction is carried out to prepare a recyclable chrome tanning agent which can be directly reused in production or can be stored for later use. The technology realizes the comprehensive utilization of a resource, reduction of the discharge amount of a heavy metal chromium, production auxiliary material saving, and reduction of the treatment cost of chromium-containing sludge, recyclable chromium used in production can save 20% of a water resource, and the full scale and the handle of leather are better than full scale and the handle realized by raw chromium powder.
Description
Technical field
The present invention relates to process for processing chromate-containing waste water.
Background technology
The chrome waste liquid that in tanning production, a tanner order produces is more difficult, and processing costs is high.Effect is undesirable, and employing alkaline precipitation makes the chromium ion in waste water form precipitated powder together with plaster and after hydraulic pressure, forms chromium-bearing sludge, belongs to dangerous and pollutes.
Summary of the invention
The object of the invention is to overcome the above problems, process for processing chromate-containing waste water is provided.
The present invention realizes by following manufacture craft: process for processing chromate-containing waste water, the chrome waste liquid that chrome tanning process produces is precipitate and separate under certain potential of hydrogen condition, Chrome-free supernatant fluid reuse is in liming workshop section, chromium ion forms solid matter with other throw out, remove impurity through separating and filtering, acid-soluble ageing is reacted, and produces the chrome tanning agent of recoverable, direct reuse is for subsequent use in producing or storing, and concrete steps are as follows:
The first step, tanning workshop set gradually to Chrome Tanning Wastewater collecting tank drainageway: planar grille 15mm, 10mm and mechanical grille 3mm, 2mm, remove macrobead scurf, hair slag, wood chip etc.
The waste water of second step, collecting tank pumps into reaction tank by pump, for further removing impurity, hydraulic screen is set.
The 3rd step, in reaction tank, add liquid caustic soda (sodium hydroxide) to adjust pH value between 10-10.5, reaction end pH value is 8-9.5, makes being converted into precipitation and separating in Chrome Tanning Wastewater, and pneumatic blending is set in reaction tank, fully reacts more than 2 hours.
The 4th step, completely reacted mixture pump into settling tank, add appropriate polyacrylamide simultaneously, and the residence time, more than 2 hours mud adopted pressure filter press filtration, after the press filtration of chromium mud is good, then with clear water washing one side, to improve chromium mud purity.
The 5th step, chromium mud acid are dissolved in reactor and carry out, and sulfuric acid used is dilute sulphuric acid.First the vitriol oil is mixed with to certain density dilute sulphuric acid.After 90C-100C is incubated 3 hours, cools to 40-50C, press filtration obtains chrome liquor.
The 6th step, press filtration obtain chrome liquor and flow into transfer tank, temporary storage.
The 7th step, concentrated, chrome liquor pumps into concentration kettle by transfer tank, by concentrating under reduced pressure, chrome liquor solid content is brought up to more than 45%, obtains containing chromium retanning agent.
Beneficial effect of the present invention is: both realized the comprehensive utilization of resource, reduce again the quantity discharged of heavy metal chromium, save production auxiliary materials and reduce again the outer expense of processing of chromium-bearing sludge, through life-time service, can react for the production of the water resources that not only can save 20% by reuse chromium, point full scale, the feel of leather are better than former chromium powder simultaneously.
Embodiment
Process for processing chromate-containing waste water, completes by following processing step:
The first step, tanning workshop set gradually to Chrome Tanning Wastewater collecting tank drainageway: planar grille 15mm, 10mm and mechanical grille 3mm, 2mm, remove macrobead scurf, hair slag, wood chip etc.
The waste water of second step, collecting tank pumps into reaction tank by pump, for further removing impurity, hydraulic screen is set.
The 3rd step, in reaction tank, add liquid caustic soda (sodium hydroxide) to adjust pH value 10.2, reaction end pH value is 9.1, makes being converted into precipitation and separating in Chrome Tanning Wastewater, and pneumatic blending is set in reaction tank, fully reacts 4 hours.
The 4th step, completely reacted mixture pump into settling tank, add appropriate polyacrylamide simultaneously, and 3 hours residence time, mud adopts pressure filter press filtration, after the press filtration of chromium mud is good, then with clear water washing one side, to improve chromium mud purity.
The 5th step, chromium mud acid are dissolved in reactor and carry out, and sulfuric acid used is dilute sulphuric acid, first the vitriol oil are mixed with to certain density dilute sulphuric acid, and after 95 ° of C are incubated 3 hours, cool to 45 ° of C, press filtration obtains chrome liquor.
The 6th step, press filtration obtain chrome liquor and flow into transfer tank, temporary storage.
The 7th step, concentrated, chrome liquor pumps into concentration kettle by transfer tank, by concentrating under reduced pressure, chrome liquor solid content is brought up to more than 45%, obtains containing chromium retanning agent.
Claims (1)
1. process for processing chromate-containing waste water, is characterized in that: it is completed by following steps:
The first step, tanning workshop set gradually to Chrome Tanning Wastewater collecting tank drainageway: planar grille 15mm, 10mm and mechanical grille 3mm, 2mm, remove macrobead scurf, hair slag, wood chip etc.;
The waste water of second step, collecting tank pumps into reaction tank by pump, for further removing impurity, hydraulic screen is set;
The 3rd step, in reaction tank, add liquid caustic soda (sodium hydroxide) to adjust pH value between 10-10.5, reaction end pH value is 8-9.5, makes being converted into precipitation and separating in Chrome Tanning Wastewater, and pneumatic blending is set in reaction tank, fully reacts more than 2 hours;
The 4th step, completely reacted mixture pump into settling tank, add appropriate polyacrylamide simultaneously, and the residence time is more than 2 hours, and mud adopts pressure filter press filtration, after the press filtration of chromium mud is good, then with clear water washing one side;
The 5th step, chromium mud acid are dissolved in reactor and carry out, and sulfuric acid used is dilute sulphuric acid;
First the vitriol oil is mixed with to certain density dilute sulphuric acid, after 90C-100C is incubated 3 hours, cools to 40-50C, press filtration obtains chrome liquor;
The 6th step, press filtration obtain chrome liquor and flow into transfer tank, temporary storage;
The 7th step, concentrated, chrome liquor pumps into concentration kettle by transfer tank, obtains containing chromium retanning agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210471314.0A CN103833155A (en) | 2012-11-20 | 2012-11-20 | Chromium-containing wastewater treatment technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210471314.0A CN103833155A (en) | 2012-11-20 | 2012-11-20 | Chromium-containing wastewater treatment technology |
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| CN103833155A true CN103833155A (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210471314.0A Pending CN103833155A (en) | 2012-11-20 | 2012-11-20 | Chromium-containing wastewater treatment technology |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105523665A (en) * | 2016-01-12 | 2016-04-27 | 武汉森泰环保股份有限公司 | Method for recovering chromium from leather tanning waste water |
| EP3045548A3 (en) * | 2014-12-22 | 2016-10-12 | Zhang, Zhuangdou | Chromium tanning process with reduced waste discharge |
| CN106277101A (en) * | 2016-08-30 | 2017-01-04 | 陕西科技大学 | A kind of method utilizing lamina sodium silicate precipitation chroming waste liquor and chromium resource to reclaim |
| CN106630008A (en) * | 2016-03-22 | 2017-05-10 | 深圳前海中盛环保科技有限公司 | Novel method for chrome tanning wastewater treatment and chrome recycling |
| AU2015271965B2 (en) * | 2014-12-22 | 2017-09-07 | Zhuangdou ZHANG | Tannery process with effluent recycling |
| US9776887B2 (en) | 2013-12-04 | 2017-10-03 | Zhuangdou Zhang | Tannery process with effluent recycling |
| CN107640848A (en) * | 2016-07-22 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of method of the processing of flushing waste water containing chromium |
| US10260115B2 (en) | 2014-03-20 | 2019-04-16 | Zhuangdou Zhang | Leather production using waste liquids |
| CN110002564A (en) * | 2019-05-13 | 2019-07-12 | 浙江海洋大学 | The processing method of Chrome Tanning Wastewater |
| CN110923477A (en) * | 2019-12-11 | 2020-03-27 | 中南大学 | Method for separating and recovering chromium in tanning chromium-containing sludge |
| CN115465968A (en) * | 2022-09-16 | 2022-12-13 | 嘉兴学院 | Method for separating and recovering chromium in chrome tanning waste liquid |
-
2012
- 2012-11-20 CN CN201210471314.0A patent/CN103833155A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10501336B2 (en) | 2013-12-04 | 2019-12-10 | Zhuangdou Zhang | Tannery process with effluent recycling |
| US11040890B2 (en) | 2013-12-04 | 2021-06-22 | Zhuangdou Zhang | Tannery process with effluent recycling |
| US9776887B2 (en) | 2013-12-04 | 2017-10-03 | Zhuangdou Zhang | Tannery process with effluent recycling |
| US10260115B2 (en) | 2014-03-20 | 2019-04-16 | Zhuangdou Zhang | Leather production using waste liquids |
| EP3045548A3 (en) * | 2014-12-22 | 2016-10-12 | Zhang, Zhuangdou | Chromium tanning process with reduced waste discharge |
| AU2015271965B2 (en) * | 2014-12-22 | 2017-09-07 | Zhuangdou ZHANG | Tannery process with effluent recycling |
| CN105523665A (en) * | 2016-01-12 | 2016-04-27 | 武汉森泰环保股份有限公司 | Method for recovering chromium from leather tanning waste water |
| CN105523665B (en) * | 2016-01-12 | 2018-02-09 | 武汉森泰环保股份有限公司 | A kind of method that chromium is reclaimed from leather tanning wastewater |
| CN106630008A (en) * | 2016-03-22 | 2017-05-10 | 深圳前海中盛环保科技有限公司 | Novel method for chrome tanning wastewater treatment and chrome recycling |
| CN107640848A (en) * | 2016-07-22 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of method of the processing of flushing waste water containing chromium |
| CN106277101B (en) * | 2016-08-30 | 2019-07-30 | 陕西科技大学 | A method of chroming waste liquor is precipitated using lamina sodium silicate and chromium resource recycles |
| CN106277101A (en) * | 2016-08-30 | 2017-01-04 | 陕西科技大学 | A kind of method utilizing lamina sodium silicate precipitation chroming waste liquor and chromium resource to reclaim |
| CN110002564A (en) * | 2019-05-13 | 2019-07-12 | 浙江海洋大学 | The processing method of Chrome Tanning Wastewater |
| CN110923477A (en) * | 2019-12-11 | 2020-03-27 | 中南大学 | Method for separating and recovering chromium in tanning chromium-containing sludge |
| CN115465968A (en) * | 2022-09-16 | 2022-12-13 | 嘉兴学院 | Method for separating and recovering chromium in chrome tanning waste liquid |
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Application publication date: 20140604 |