CN103387302A - Cadmium-bearing wastewater treatment system - Google Patents
Cadmium-bearing wastewater treatment system Download PDFInfo
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- CN103387302A CN103387302A CN2013103638005A CN201310363800A CN103387302A CN 103387302 A CN103387302 A CN 103387302A CN 2013103638005 A CN2013103638005 A CN 2013103638005A CN 201310363800 A CN201310363800 A CN 201310363800A CN 103387302 A CN103387302 A CN 103387302A
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Abstract
The invention relates to a cadmium-bearing wastewater treatment system which is divided into three treatment areas, namely, an adjusting reaction area, a heating oxidation area and a precipitate separating area. Each treatment area is independently provided with a slag-drip opening for respectively discharging precipitate slag in each treatment area. According to the treatment system, ferrous sulfate is casted into the adjusting reaction area, and NaOH is added to control pH value of wastewater within 6-9, and meanwhile, high temperature air is introduced through a hot air blower to stir and pre-heat. The wastewater is heated to 60-70 DEG C and oxidized by hot air to form ferrite crystals, so that cadmium ions enter into ferrite lattices which form flocculating constituents with greater grain size under the effect of a flocculant and can be thoroughly separated from the wastewater through precipitation for about 30 minutes. The ferrite lattices precipitated and separated in the cadmium-bearing wastewater treatment system provided by the invention can be recycled, so that the risk of secondary pollution caused by treating the cadmium-bearing wastewater by a common method of precipitation is reduced or eliminated.
Description
Technical field
The invention belongs to environmental technology field, particularly a kind of cadmium wastewater treatment system.
Background technology
Cadmium enters in environment by waste water usually, then by irrigation, enters food, and paddy rice is typical " crop is injured ".People's edible food that contains cadmium for a long time can cause itai-itai (being that osteocarcinoma is sick).Illness shows as the arthralgias such as waist, hand, pin.Illness continued after several years, and neurodynia, ostalgia phenomenon can occur at patient's whole body each position, and moving difficulty is even breathed and all can be brought insufferable misery.Arrived the ill later stage, patient's skeleton softening, atrophy, four limbs are crooked, deformation of spinal column, sclerotin is crisp, even cough can cause fracture.The patient can not take food, and pain is incomparable.
Cadmium wastewater mainly, from mining, smelting industry etc., also contains cadmium in part factory discharging waste gas, may affect place far away by atmospheric precipitation, then through rainwash, enters water body.Therefore, it is imperative cadmium wastewater being carried out processing efficiently.
Summary of the invention
The purpose of this invention is to provide a kind of efficient cadmium wastewater treatment system, this system is not only simple in structure and with low cost.
A kind of cadmium wastewater treatment system, this Waste Water Treatment are divided into becomes 3 treatment zones, that is: conditioned reaction district, heated oxide district, depositing separation area; Each treatment zone arranges separately slag-drip opening, discharges respectively the precipitation slag for the treatment of zone;
The conditioned reaction district: district adds ferrous sulfate at conditioned reaction, and adds NaOH to regulate wastewater pH, controls waste water ph 6～9, adds high temperature air to stir and preheats by calorifier simultaneously;
Heated oxide district: pass into a large amount of high temperature airs in the reacting by heating district, waste water is heated to 60～70 ℃ and with warm air, waste water is carried out oxidation, can form ferrite matrix and cadmium ion is entered in ferrite lattice, thereby reaching the purpose of precipitate and separate;
Settling region: form the flocs unit of larger particle diameter through the ferrite matrix in heated oxide district oxidized waste water under the effect that adds flocculation agent, through the precipitations of approximately 30 minutes, can thoroughly separate from water, sediment is discharged from slag-drip opening.
Adopt cadmium wastewater treatment system precipitate and separate of the present invention ferrite matrix recoverable out, thereby reach, reduce or eliminate the common precipitator method and process the secondary pollution risk of cadmium wastewater.
Description of drawings
Fig. 1 is the structural representation for the treatment of system of the present invention.
Embodiment
At environmental protection industry (epi), processing mode to cadmium wastewater is had nothing in common with each other, research shows, it is a kind of good method that ferrite process is removed in waste water the many kinds of metal ions such as cadmium, adopt the method, under certain processing condition, after processing, the content of clear water discharging cadmium is less than the emission standard (0.1mg/L) of national regulation.The method that the present invention carries out the cadmium wastewater processing is: add ferrous sulfate in cadmium wastewater, adopt sodium hydroxide to regulate pH to 9～10, waste water is heated to 60～70 ℃ and pass into pressurized air and carry out oxidation, can form ferrite matrix and cadmium ion is entered in ferrite lattice, filter or precipitation is just separable goes out to contain Cd ferrite, containing Cd ferrite can recycle, reduce or eliminate the common precipitator method and process the secondary pollution risk of cadmium wastewater thereby reach, clear water can discharge or reuse.
As shown in Figure 1, a kind of new and effective cadmium wastewater treatment system: this new and effective cadmium wastewater treatment system is divided into becomes 3 treatment zones, that is: conditioned reaction district, heated oxide district, depositing separation area; Each treatment zone arranges separately slag-drip opening, discharges respectively the precipitation slag for the treatment of zone.
The conditioned reaction district: district adds ferrous sulfate at conditioned reaction, and adds NaOH to regulate wastewater pH, controls waste water ph 6～9, high temperature air (adopting calorifier to provide) is provided simultaneously stirs and preheat.
Heated oxide district: pass into a large amount of high temperature airs in the reacting by heating district, waste water is heated to 60～70 ℃ and with warm air, waste water is carried out oxidation, can form ferrite matrix and cadmium ion is entered in ferrite lattice, thereby reaching the purpose of precipitate and separate.
Settling region: form the flocs unit of larger particle diameter through the ferrite matrix in heated oxide district oxidized waste water under the effect that adds flocculation agent, through the precipitations of approximately 30 minutes, can thoroughly separate from water, sediment is discharged from slag-drip opening.
Claims (1)
1. cadmium wastewater treatment system, it is characterized in that: described cadmium wastewater treatment system is divided into becomes 3 treatment zones, that is: conditioned reaction district, heated oxide district, depositing separation area; Each treatment zone arranges separately slag-drip opening, discharges respectively the precipitation slag for the treatment of zone;
---the conditioned reaction district: district adds ferrous sulfate at conditioned reaction, and adds NaOH to regulate wastewater pH, controls waste water ph 6～9, adds high temperature air to stir and preheats by calorifier simultaneously;
---heated oxide district: in the reacting by heating district, pass into a large amount of high temperature airs, waste water is heated to 60～70 ℃ and with warm air, waste water is carried out oxidation, can form ferrite matrix and cadmium ion is entered in ferrite lattice, thereby reaching the purpose of precipitate and separate;
---settling region: form the flocs unit of larger particle diameter through the ferrite matrix in heated oxide district oxidized waste water under the effect that adds flocculation agent, through the precipitations of approximately 30 minutes, can thoroughly separate from water, sediment is discharged from slag-drip opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013103638005A CN103387302A (en) | 2013-08-20 | 2013-08-20 | Cadmium-bearing wastewater treatment system |
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| CN2013103638005A CN103387302A (en) | 2013-08-20 | 2013-08-20 | Cadmium-bearing wastewater treatment system |
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| CN103387302A true CN103387302A (en) | 2013-11-13 |
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| CN2013103638005A Pending CN103387302A (en) | 2013-08-20 | 2013-08-20 | Cadmium-bearing wastewater treatment system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106583437A (en) * | 2017-01-05 | 2017-04-26 | 长沙汇聚环境技术有限公司 | Restoration method for cadmium-contaminated soil |
| CN111807601A (en) * | 2020-07-20 | 2020-10-23 | 上海相出净流环保科技开发有限公司 | Heavy metal wastewater treatment method and treatment system based on dynamic in-situ crystal nucleus growth mineralization |
| CN111847709A (en) * | 2020-07-06 | 2020-10-30 | 浙江工商大学 | Method for reducing heavy metal cadmium content in mussel cooking liquid by ferrite method |
Citations (4)
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| CN85101973A (en) * | 1985-04-01 | 1986-09-03 | 江西冶金学院 | A kind of metallurgical waste water purification technology |
| US20070209989A1 (en) * | 2004-04-26 | 2007-09-13 | Mitsubishi Materials Corporation | Reducing water purification material, method for producing reducing water purification material, method for treating wastewater, and wastewater treatment apparatus |
| CN102491432A (en) * | 2011-12-12 | 2012-06-13 | 四川金岳新型材料有限公司 | Method and system for removing iron by hydrolyzing at high temperature |
| CN102674526A (en) * | 2012-05-14 | 2012-09-19 | 中南大学 | Method for precipitating and stabilizing As from As-containing solution |
-
2013
- 2013-08-20 CN CN2013103638005A patent/CN103387302A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101973A (en) * | 1985-04-01 | 1986-09-03 | 江西冶金学院 | A kind of metallurgical waste water purification technology |
| US20070209989A1 (en) * | 2004-04-26 | 2007-09-13 | Mitsubishi Materials Corporation | Reducing water purification material, method for producing reducing water purification material, method for treating wastewater, and wastewater treatment apparatus |
| CN102491432A (en) * | 2011-12-12 | 2012-06-13 | 四川金岳新型材料有限公司 | Method and system for removing iron by hydrolyzing at high temperature |
| CN102674526A (en) * | 2012-05-14 | 2012-09-19 | 中南大学 | Method for precipitating and stabilizing As from As-containing solution |
Non-Patent Citations (1)
| Title |
|---|
| 段睿 等: "常温中和铁氧体法处理高浓度含铜废水的研究", 《工业水处理》, vol. 33, no. 5, 31 May 2013 (2013-05-31), pages 53 - 55 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106583437A (en) * | 2017-01-05 | 2017-04-26 | 长沙汇聚环境技术有限公司 | Restoration method for cadmium-contaminated soil |
| CN111847709A (en) * | 2020-07-06 | 2020-10-30 | 浙江工商大学 | Method for reducing heavy metal cadmium content in mussel cooking liquid by ferrite method |
| CN111807601A (en) * | 2020-07-20 | 2020-10-23 | 上海相出净流环保科技开发有限公司 | Heavy metal wastewater treatment method and treatment system based on dynamic in-situ crystal nucleus growth mineralization |
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Application publication date: 20131113 |