CN102259998A - Treatment method for wastewater containing heavy metals - Google Patents

Treatment method for wastewater containing heavy metals Download PDF

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Publication number
CN102259998A
CN102259998A CN 201110212927 CN201110212927A CN102259998A CN 102259998 A CN102259998 A CN 102259998A CN 201110212927 CN201110212927 CN 201110212927 CN 201110212927 A CN201110212927 A CN 201110212927A CN 102259998 A CN102259998 A CN 102259998A
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Prior art keywords
waste water
heavy metal
value
tank
treatment process
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CN 201110212927
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Chinese (zh)
Inventor
李爱军
叶多梅
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Jiangsu Nanfang Coating & Environment Protection Equipment Co Ltd
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Jiangsu Nanfang Coating & Environment Protection Equipment Co Ltd
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Priority to CN 201110212927 priority Critical patent/CN102259998A/en
Publication of CN102259998A publication Critical patent/CN102259998A/en
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Abstract

The invention discloses a treatment method for wastewater containing heavy metals. The treatment method is carried out according to the following steps that: firstly a pH value of the wastewater containing the heavy metals is regulated into the range of 9.5 to 11 from the range of 1 to 3 in a pH regulating tank by caustic soda liquid; then the wastewater is led into a water distribution tank added with a coagulant and a coagulant aid, the wastewater in the water distribution tank flows into a sedimentation tank to be coagulated and precipitated under the action of the gravity, supernatant fluid obtained after coagulation and precipitation overflows from a weir crest at the upper side of the sedimentation tank and precipitated sludge is treated additionally; the obtained supernatant fluid is led into the pH regulating tank and a pH value of the supernatant fluid is regulated into the range of 6 to 9 by acid solution; and finally the supernatant fluid is treated by a sand filter and an activated carbon adsorption tank and then is led into a clean water basin. The treatment method has short process flow, low cost of occupied area and equipment and double advanced treatment measures of filtration and adsorption in the process flow and adopts a double pH value regulation mode so that effluent quality meets the requirements of the comprehensive sewage discharge standard.

Description

A kind of treatment process of heavy metal-containing waste water
Technical field
The present invention relates to water treatment field, especially relate to the processing of waste water or sewage, specifically a kind of treatment process of heavy metal-containing waste water.
Background technology
Heavy metal wastewater thereby is meant the waste water that contains heavy metal of discharging in the Industrial processes such as mining and metallurgy, machinofacture, chemical industry, electronics, instrument.Heavy metal (as containing cadmium, nickel, mercury, zinc etc.) waste water is the most serious and the mankind are endangered one of maximum trade effluent to an environmental pollution, and its water quality and quantity is relevant with production technique.Heavy metal in the waste water is that various common methods can not be decomposed destructive, and can only shift their location and change their physics and chemical form.For example, after chemical precipitation was handled, the heavy metal in the waste water was transformed into insoluble chemical compound and precipitates from the dissolved ionic condition, transfers to from water in the mud; After ion exchange treatment, the metal ion in the waste water is transferred on the ion exchange resin; After regeneration, transfer to the regeneration waste liquid from ion exchange resin again.In a word, heavy metal wastewater thereby forms two kinds of products after treatment, and the one, removed the treating water of heavy metal basically, the one, the enriched product of heavy metal.The treating water that heavy metal concentration is lower than emission standard can discharge; If meet the requirement of production technique water, preferably reuse.Heavy metal in the enriched product mostly has use value, should recycle as far as possible; There are not recovery value, harmless treatment in addition.Because heavy metal can not be made when it participates in the food chain circulation and finally accumulates in vivo by biological decomposition after entering environment, can destroy organism normal physiological Metabolic activity, is detrimental to health.Therefore, environmental pollution, the especially heavy metal of improvement heavy metal receive people's very big concern to the pollution problem of water resources.For existing chemical precipitation method, water outlet often technical process up to standard is long; Its short pH value of technical process can not satisfy precipitation or water outlet requirement up to standard, even bad heavy metal ion or the suspended substance of causing of sedimentation effect is not up to standard.
Summary of the invention
The objective of the invention is problem, the treatment process of the heavy metal-containing waste water that a kind of technical process is short, effluent quality is up to standard is provided at existing technical process existence.
The objective of the invention is to solve by the following technical programs:
A kind of treatment process of heavy metal-containing waste water, described treatment process is undertaken by following step:
(1) be in the waste water importing PH equalizing tank that contains heavy metal of 1-3 with pH value, add a certain amount of liquid caustic soda simultaneously in the PH equalizing tank, the pH value that will contain the waste water of heavy metal behind chemical reaction is adjusted to 9.5-11;
(2) waste water of regulating through pH value in the step (1) is imported the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, the post precipitation crest of weir from the settling tank upside; Precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond;
(3) supernatant liquor that obtains in the step (2) is imported in the PH equalizing tank, in the PH equalizing tank, add a certain amount of acid solution simultaneously, the supernatant liquor pH value in the PH equalizing tank is adjusted to 6-9;
(4) with satisfy the water outlet of reuse standard in the step (3) successively by acquisition behind sand filter and the activated carbon adsorption pond through the supernatant liquor of pH value adjusting, import in the clean water basin.
Liquid caustic soda concentration in the described step (1) is 20-35%.
Liquid caustic soda consumption in the described step (1) is 1:55-10000 with the described ratio that contains the wastewater volume of heavy metal.
Mud in the described step (2) is derived from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handles by the sludge press filtration device again.
Acid solution in the described step (3) is that concentration is the dilute acid soln of 10-15%.
Acid solution in the described step (3) is a dilution heat of sulfuric acid.
Supernatant liquor pH value in the described step (3) is 6.5-8.5.
Sand filter in the described step (4) is the quartz sand filter tank.
The present invention has following advantage compared to existing technology:
Technical process of the present invention is shorter, has saved conventional loaded down with trivial details technology, and land used and equipment cost are less; And the pH value regulating step is all arranged in the front and back stage of technical process, it is up to standard to guarantee that pH value satisfies the pH value of required condition of precipitation and water outlet.
Have the double-depth treatment measures of filtering in the technical process of the present invention with absorption, make in the water outlet contained heavy metal ion content be not more than that 0.1mg/l, SS content are not more than 50mg/l, CODcr is not more than 80mg/l, reaches the requirement of " integrated wastewater discharge standard ".
Description of drawings
Accompanying drawing 1 is a process flow sheet of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and embodiment.
Embodiment 1
As shown in Figure 1, at first pH value being approximately 1 lead waste water imports in the PH equalizing tank, while a certain amount of concentration of adding in the PH equalizing tank is 35% liquid caustic soda, the consumption of this liquid caustic soda is 1:100-120 with the ratio of the lead waste water volume of importing, and the pH value with lead waste water behind chemical reaction is adjusted to 10.5-11; Lead waste water after will regulating through pH value then imports the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, lead waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, post precipitation crest of weir from the settling tank upside, precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond, and derive from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handle reuse by the sludge press filtration device again; Then the supernatant liquor that obtains is imported in another PH equalizing tank, while a certain amount of concentration of adding in the PH equalizing tank is 15% dilution heat of sulfuric acid, and the supernatant liquor pH value in the PH equalizing tank is adjusted to 6.5-8.5; To satisfy the water outlet of reuse standard through the supernatant liquor that pH value is regulated successively by acquisition behind quartz sand filter tank and the activated carbon adsorption pond at last, import in the clean water basin.
Embodiment 2
As shown in Figure 1, at first be that 1 lead waste water imports in the PH equalizing tank with pH value, while a certain amount of concentration of adding in the PH equalizing tank is 20% liquid caustic soda, and the consumption of this liquid caustic soda is 1:55-65 with the ratio of the lead waste water volume of importing, and the pH value with lead waste water behind chemical reaction is adjusted to 10-10.5; Lead waste water after will regulating through pH value then imports the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, lead waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, post precipitation crest of weir from the settling tank upside, precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond, and derive from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handle reuse by the sludge press filtration device again; Then the supernatant liquor that obtains is imported in another PH equalizing tank, while a certain amount of concentration of adding in the PH equalizing tank is 10% dilution heat of sulfuric acid, and the supernatant liquor pH value in the PH equalizing tank is adjusted to 6.5-8.5; To satisfy the water outlet of reuse standard through the supernatant liquor that pH value is regulated successively by acquisition behind quartz sand filter tank and the activated carbon adsorption pond at last, import in the clean water basin.
Embodiment 3
As shown in Figure 1, at first be that 2 lead waste water imports in the PH equalizing tank with pH value, while a certain amount of concentration of adding in the PH equalizing tank is 30% liquid caustic soda, the consumption of this liquid caustic soda is 1:800-970 with the ratio of the lead waste water volume of importing, and the pH value with lead waste water behind chemical reaction is adjusted to 9-10.5; Lead waste water after will regulating through pH value then imports the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, lead waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, post precipitation crest of weir from the settling tank upside, precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond, and derive from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handle reuse by the sludge press filtration device again; Then the supernatant liquor that obtains is imported in another PH equalizing tank, while a certain amount of concentration of adding in the PH equalizing tank is 10% dilution heat of sulfuric acid, and the supernatant liquor pH value in the PH equalizing tank is adjusted to 6.5-8.5; To satisfy the water outlet of reuse standard through the supernatant liquor that pH value is regulated successively by acquisition behind quartz sand filter tank and the activated carbon adsorption pond at last, import in the clean water basin.
Embodiment 4
As shown in Figure 1, at first be that 2 lead waste water imports in the PH equalizing tank with pH value, while a certain amount of concentration of adding in the PH equalizing tank is 20% liquid caustic soda, the consumption of this liquid caustic soda is 1:500-600 with the ratio of the lead waste water volume of importing, and the pH value with lead waste water behind chemical reaction is adjusted to 10-10.5; Lead waste water after will regulating through pH value then imports the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, lead waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, post precipitation crest of weir from the settling tank upside, precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond, and derive from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handle reuse by the sludge press filtration device again; Then the supernatant liquor that obtains is imported in another PH equalizing tank, while a certain amount of concentration of adding in the PH equalizing tank is 10% dilution heat of sulfuric acid, and the supernatant liquor pH value in the PH equalizing tank is adjusted to 6.5-8.5; To satisfy the water outlet of reuse standard through the supernatant liquor that pH value is regulated successively by acquisition behind quartz sand filter tank and the activated carbon adsorption pond at last, import in the clean water basin.
Embodiment 5
As shown in Figure 1, at first be that 3 lead waste water imports in the PH equalizing tank with pH value, while a certain amount of concentration of adding in the PH equalizing tank is 30% liquid caustic soda, the consumption of this liquid caustic soda is 1:7100-8000 with the ratio of the lead waste water volume of importing, and the pH value with lead waste water behind chemical reaction is adjusted to 10.5-11; Lead waste water after will regulating through pH value then imports the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, lead waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, post precipitation crest of weir from the settling tank upside, precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond, and derive from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handle reuse by the sludge press filtration device again; Then the supernatant liquor that obtains is imported in another PH equalizing tank, while a certain amount of concentration of adding in the PH equalizing tank is 10% dilution heat of sulfuric acid, and the supernatant liquor pH value in the PH equalizing tank is adjusted to 6.5-8.5; To satisfy the water outlet of reuse standard through the supernatant liquor that pH value is regulated successively by acquisition behind quartz sand filter tank and the activated carbon adsorption pond at last, import in the clean water basin.
Embodiment 6
As shown in Figure 1, at first be that 3 lead waste water imports in the PH equalizing tank with pH value, while a certain amount of concentration of adding in the PH equalizing tank is 20% liquid caustic soda, the consumption of this liquid caustic soda is 1:4000-4600 with the ratio of the lead waste water volume of importing, and the pH value with lead waste water behind chemical reaction is adjusted to 9.5-10.5; Lead waste water after will regulating through pH value then imports the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, lead waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, post precipitation crest of weir from the settling tank upside, precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond, and derive from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handle reuse by the sludge press filtration device again; Then the supernatant liquor that obtains is imported in another PH equalizing tank, while a certain amount of concentration of adding in the PH equalizing tank is 10% dilution heat of sulfuric acid, and the supernatant liquor pH value in the PH equalizing tank is adjusted to 6.5-8.5; To satisfy the water outlet of reuse standard through the supernatant liquor that pH value is regulated successively by acquisition behind quartz sand filter tank and the activated carbon adsorption pond at last, import in the clean water basin.
According to the lead waste water of art breading of the present invention, the water quality before and after it is handled is as shown in the table:
Project Total plumbous CODcr Colourity SS Petroleum-type pH
Unit mg/l mg/l Doubly mg/l mg/l Zero dimension
Influent quality 10 120~150 100~200 150~300 10~30 1~3
The effluent quality standard 0.5 ≤100 ≤50 ≤70 ≤10 6~9
Actual effluent quality 0.1 ≤80 ≤30 ≤50 ≤8 6.5~8.5
Compare with method in the past, the lead waste water after art breading of the present invention, its total lead content is not more than that 0.1mg/l, SS content are not more than 50mg/l, CODcr is not more than 80mg/l; And technical process is shorter, saved conventional loaded down with trivial details technology, land used and equipment cost are less, in the front and back stage of technical process the pH value regulating step are arranged all, can guarantee to precipitate required pH value condition and to go out water ph value up to standard, reach the requirement of " integrated wastewater discharge standard ".
The treatment process of the heavy metal-containing waste water that the present invention proposes, processing by lead waste water is described, person skilled obviously can be changed or suitable change or combination present method in the scope that does not break away from content of the present invention, realizes technology of the present invention.Special needs to be pointed out is the change that all are similar or change apparent to those skilled in the artly, all be regarded as being included in the scope of content of the present invention.

Claims (8)

1. the treatment process of a heavy metal-containing waste water is characterized in that described treatment process undertaken by following step:
(1) be in the waste water importing PH equalizing tank that contains heavy metal of 1-3 with pH value, add a certain amount of liquid caustic soda simultaneously in the PH equalizing tank, the pH value that will contain the waste water of heavy metal behind chemical reaction is adjusted to 9.5-11;
(2) waste water that step (1) is regulated through pH value imports the cloth pond, and in the cloth pond, add coagulating agent and coagulant aids to strengthen sedimentation effect, waste water in the cloth pond flows into coagulation, precipitation in the settling tank under the effect of gravity, overflow through the supernatant liquor of coagulation, the post precipitation crest of weir from the settling tank upside; Precipitating the mud that obtains simultaneously falls in the mud district that sinks to the bottom the bottom side, pond;
(3) supernatant liquor that obtains in the step (2) is imported in the PH equalizing tank, in the PH equalizing tank, add a certain amount of acid solution simultaneously, the supernatant liquor pH value in the PH equalizing tank is adjusted to 6-9;
(4) with satisfy the water outlet of reuse standard in the step (3) successively by acquisition behind sand filter and the activated carbon adsorption pond through the supernatant liquor of pH value adjusting, import in the clean water basin.
2. the treatment process of heavy metal-containing waste water according to claim 1 is characterized in that the liquid caustic soda concentration in the described step (1) is 20-35%.
3. the treatment process of heavy metal-containing waste water according to claim 1 and 2 is characterized in that the liquid caustic soda consumption in the described step (1) is 1:55-10000 with the described ratio that contains the wastewater volume of heavy metal.
4. the treatment process of heavy metal-containing waste water according to claim 1 is characterized in that the mud in the described step (2) is derived from the mud mouth that sinks to the bottom the bottom side, pond by the mud suction unit, handles by the sludge press filtration device again.
5. the treatment process of heavy metal-containing waste water according to claim 1 is characterized in that the acid solution in the described step (3) is that concentration is the dilute acid soln of 10-15%.
6. the treatment process of heavy metal-containing waste water according to claim 1 or 5 is characterized in that the acid solution in the described step (3) is a dilution heat of sulfuric acid.
7. the treatment process of heavy metal-containing waste water according to claim 1 is characterized in that the supernatant liquor pH value in the described step (3) is 6.5-8.5.
8. the treatment process of heavy metal-containing waste water according to claim 1 is characterized in that the sand filter in the described step (4) is the quartz sand filter tank.
CN 201110212927 2011-07-28 2011-07-28 Treatment method for wastewater containing heavy metals Pending CN102259998A (en)

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CN102718347A (en) * 2012-07-18 2012-10-10 江西理工大学 Method for treating multi-metal-contained wastewater in process of crushing and sorting waste circuit board
CN103601315A (en) * 2013-11-12 2014-02-26 西南科技大学 Method for treating heavy metal wastewater in mining and metallurgy by use of waste tea dust
CN104176854A (en) * 2014-08-21 2014-12-03 营口东吉科技(集团)有限公司 Method for utilizing mineral separation backwater in magnesite reverse flotation desilicification
CN104496081A (en) * 2014-12-23 2015-04-08 重庆澄露环境工程有限公司 Mercury-containing wastewater treatment method and treatment device
CN104944500A (en) * 2015-05-26 2015-09-30 陕西工信环保科技发展有限公司 Control method for continuously treating heavy-metal-containing liquid
CN105236675A (en) * 2015-10-14 2016-01-13 深圳职业技术学院 Electroplating waste water treatment method and device
CN105417779A (en) * 2015-11-30 2016-03-23 镇江亿海精密仪器设备有限公司 Treatment equipment for wastewater containing heavy metal ions
CN105858979A (en) * 2016-06-24 2016-08-17 李嘉 Beneficiation wastewater treatment method
CN106007074A (en) * 2016-07-04 2016-10-12 广西壮族自治区环境保护科学研究院 Lead-zinc smelting wastewater treatment method
CN107986531A (en) * 2017-12-15 2018-05-04 苏州纳贝通环境科技有限公司 A kind of processing method of heavy metal-containing waste water
CN109607908A (en) * 2018-11-13 2019-04-12 长沙埃比林环保科技有限公司 A kind of processing method of chromate waste water
CN110759496A (en) * 2018-07-26 2020-02-07 宝山钢铁股份有限公司 Method and system for removing total hardness and COD (chemical oxygen demand) in cation resin regeneration waste liquid
WO2022082814A1 (en) * 2020-10-21 2022-04-28 孙亚春 Complexed heavy metal wastewater treatment process

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CN102718347A (en) * 2012-07-18 2012-10-10 江西理工大学 Method for treating multi-metal-contained wastewater in process of crushing and sorting waste circuit board
CN103601315A (en) * 2013-11-12 2014-02-26 西南科技大学 Method for treating heavy metal wastewater in mining and metallurgy by use of waste tea dust
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CN104496081B (en) * 2014-12-23 2016-03-16 西南石油大学 A kind of mercurous sewage water treatment method and treatment unit
CN104496081A (en) * 2014-12-23 2015-04-08 重庆澄露环境工程有限公司 Mercury-containing wastewater treatment method and treatment device
CN104944500A (en) * 2015-05-26 2015-09-30 陕西工信环保科技发展有限公司 Control method for continuously treating heavy-metal-containing liquid
CN104944500B (en) * 2015-05-26 2017-01-25 陕西工信环保科技发展有限公司 Control method for continuously treating heavy-metal-containing liquid
CN105236675A (en) * 2015-10-14 2016-01-13 深圳职业技术学院 Electroplating waste water treatment method and device
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CN105858979A (en) * 2016-06-24 2016-08-17 李嘉 Beneficiation wastewater treatment method
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Application publication date: 20111130