CN1654353A - Comprehensive treatment method for wastewater containing organic matter and heavy metals - Google Patents
Comprehensive treatment method for wastewater containing organic matter and heavy metals Download PDFInfo
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Abstract
The invention provides a comprehensive treatment method of wastewater containing organic matters and heavy metals, which can simultaneously remove organic matters and heavy metal ions in industrial wastewater for metal surface treatment, wherein the method comprises the steps of adopting a Felton and ferrimagnet wastewater treatment technology, firstly carrying out Felton treatment on the wastewater under the conditions that the pH is 2-5 and the temperature is 20-100 ℃, then adding a ferrous salt and an alkaline agent, adjusting the pH value to be 8-12 and the temperature is 20-100 ℃, and concentrating the heavy metal ions to carry out the ferrimagnet treatment; by the comprehensive technology, organic matters and heavy metal ions in the wastewater can be efficiently removed, and a high-quality Ferrite (Ferrite) product is obtained at the same time.
Description
Technical Field
The invention relates to a method for comprehensively treating wastewater containing organic matters and heavy metals, in particular to a method for removing organic matters in advance by adopting a Fiton wastewater treatment technology (Fenton Process), and then treating multiple heavy metal ions by using a Ferrite wastewater treatment technology (Ferrite Process), so that the organic matters and the multiple heavy metal ions in the wastewater are removed, high-quality Ferrite products can be obtained, and the method has recycling value.
Background
With the development of industry and commerce, the standard of human life is gradually improved, but the people enjoy and rely on the scientific and technical culture products, and simultaneously, the imbalance of natural ecological environment and the cost of pollution and living environment harm are caused. The pollution of heavy metals is particularly serious, the pollution source of heavy metal wastewater is mainly generated by the metal surface treatment industry, and although some traditional treatment methods can treat water quality to meet the requirements of environmental protection regulations, the generated sludge and secondary pollution caused by the sludge are still serious problems. A large amount of electroplating sludge is generated in various regions around the world every year, the currently approved treatment mode of the harmful wastes is solidification treatment, but the treatment generates huge solidified bodies after the treatment, andthe treatment load of a landfill site is caused, or the problems of soil pollution are caused.
Since wastewater (e.g., electroplating wastewater) generated in the metal surface treatment industry contains heavy metal ions and organic substances (e.g., surfactants) which are difficult to biologically treat and decompose, the existing wastewater treatment is to treat the organic substances by a Fiton (Fenton) treatment technology and to treat the heavy metal ions by a ferrite wastewater treatment technology.
At present, most of objects processed by the Fiton (Fenton) processing technology are refractory organic matters, such as phenol, chlorophenol, chlorobenzene, nitrophenol, nitrobenzene, hydrocarbon, Polycyclic Aromatic Hydrocarbon (PAHs), polychlorinated biphenyl (PCBs), polychlorinated ethylene (PCE), Surfactant (Surfactant) and the like, the processing concentration can reach 175,000ppm, and the Fiton (Fenton) processing technology belongs to the wastewater processing performed by a homogeneous catalysis system and has no mass transfer limitation, so that a reaction tank is easy to design and wide in rangeThe system is widely applied to wastewater, sludge and soil treatment systems, although the decolorizing treatment effect of the Fiton (Fenton) wastewater treatment technology on dyeing and finishing wastewater is good, the UV/H can be reduced2O2The absorption effect of organic matter on UV light during treatment, but Fiton (Fenton) wastewater treatment technologyThere are limitations such as the increase of reaction time due to insufficient iron ion catalyst, the sludge problem caused by chemical coagulation of iron ion catalyst, etc. as follows:
1. the fibton (Fenton) treatment technology is performed under an acidic condition (pH 2-5), and is not suitable for soils and sludges with alkaline and buffering capabilities.
2. In the traditional Feyton (Fenton) treatment technology, iron salts (including divalent and trivalent iron ions) are added as a catalyst in the wastewater treatment of the Feyton reagent (Fenton's agent), the dosage of the catalyst has a large influence on the initial stage of the Feyton (Fenton) reaction, but hydrogen peroxide converts the divalent iron ions in a liquid phase to generate trivalent iron ions, so that the ferric iron ions are generally needed to be addedChemical precipitation methodRemoving iron ions; iron ion beam generated by traditional Fiton (Fenton) processing technologyChemical precipitation treatmentThe resulting sludge will increase the load on the landfill site, and if the wastewater contains heavy metal ions, the resulting sludge will have heavy metals dissolved out under acidic conditions, further increasing the cost of waste disposal.
3. When wastewater treatment is performed by the traditional fibton (Fenton) treatment technology, in order to reduce the sludge yield, the dosage of the catalyst used in the fibton wastewater treatment is reduced, so that the reaction time is increased by more than several hours.
In the past, the iron ion catalyst used in the Fiton (Fenton) reaction needs to be removed by means of chemical coagulation treatment, and a large amount of sludge is generated, so that the problems of sludge treatment are increased (such as sludge retreatment, treatment time is prolonged, and cost and expense are increased); in order to solve the problem of sludge treatment, although a mode of generating a Fiton reagent by Electrolysis (Electrolysis) to oxidize and decompose organic matters in wastewater is developed to avoid using a large amount of iron salt, the Electrolysis reaction time is long and is not in accordance with economic benefits; in addition, there is a method of coating iron ions on a carrier of a Fluidized bed (Fluidized bed) by using the Fluidized bed to reduce the generation of sludge, which can reduce the generation of sludge, and the carrier is too large to be suitable for the Fluidized bed treatment after the coating, so the sludge treatment amount is limited.
The ferrite wastewater treatment technology is also widely applied in the industry for treating heavy metal wastewater, belongs to a chemical precipitation method in a wet metallurgy technology, treats objects by the ferrite wastewater treatment technology and comprises multiple heavy metal ions such As arsenic (As), barium (Ba), cadmium (Cd), copper (Cu), cobalt (Co), chromium (Cr), iron (Fe), manganese (Mn), mercury (Hg), molybdenum (Mo), nickel (Ni), lead (Pb), strontium (Sr), vanadium (V) and zinc (Zn), and is also widely used for treating heavy metal wastewater such As laboratory wastewater, electroplating wastewater, stainless steel process wastewater and the like. The concentration of heavy metal ions treated by the ferrite wastewater treatment technology can reach 20000 ppm; however, the ferrite waste water treatment technology also needs to add enough reactant such as ferrous iron and ferric iron to form ferrite, and embed harmful heavy metal ions into crystal lattices to make heavy metal ions free ofDissolution by the methodAchieve the goal of stabilization treatment(ii) a The existing ferrite magnet treatment technology is characterized in that a proper amount of ferrous salt is added into waste water, and after air oxidation, a ferrite magnet with high stability can be formed and can pass a toxicity dissolution Test (TCLP), and the obtained ferrite magnet can be used as a magnetic material for further utilization due to the magnetism; however, the low concentration of organic substances in the wastewater affects the magnetic properties of Ferrite (Ferrite) products, which greatly reduces the availability of Ferrite as industrial raw materials, and the economic efficiency of products is low due to poor quality of the products obtained after treatment, resulting inlow recovery and reuse willingness of manufacturers.
As can be seen from the above description, the wastewater generated by the metal surface treatment has complex components, contains heavy metal ions and organic substances (such as surfactants) that are difficult to decompose by the biological treatment method, and cannot remove both the organic substances and the heavy metal ions by using a single fibton or ferrite wastewater treatment technique; meanwhile, the problems of high wastewater treatment cost and poor economic value of recycled resources can not be effectively improved.
The inventor of the invention considers that in the past, the ferrous ion and hydrogen peroxide wastewater treatment technology respectively adopts a single FeiPon (Fenton) wastewater treatment technology or a Ferrite (Ferrite) treatment technology for respectively treating organic matters or heavy metals in wastewater, but the ferric ion generated in the FeiPon (Fenton) wastewater treatment method during the treatment of the organic matters causes the problem of chromaticity, while ferric ions are required in the Ferrite (Ferrite) processing technique to form Ferrite (Ferrite), the invention provides a comprehensive wastewater treatment method aiming at organic matter and heavy metal wastewater in the technology to solve the problems, namely, by means of a method for integrating the wastewater treatment technologies of Fiton (Fenton) and Ferrite (Ferrite), the method is applicable to treatment of most industrial wastewater generated by metal surface treatment, and reduces the flow and equipment units of wastewater treatment and the sludge generation amount.
Disclosure of Invention
The subject matter of the present application includes:
1. the method integrates the Felton (Fenton) and Ferrite (Ferrite) wastewater treatment technologies, and uses ferrous iron, hydrogen peroxide and the like to treat mixed wastewater of organic matters and heavy metal ions.
2. The influence of organic matters on the generated Ferrite (Ferrite) is reduced, and the quality of the Ferrite (Ferrite) product obtained during the heavy metal ion wastewater treatment is improved.
3. The ferrite method is adopted to change the iron ion catalyst generated after the Feiton wastewater treatment into a ferrite which can be used as resources, so as to solve the chromaticity problem caused by ferric ions after the Feiton wastewater treatment and the iron sludge problem generated by coagulation and precipitation.
The necessary technical content and characteristics of the patent implementation include:
1. the wastewater is treated by a Fiton (Fenton) wastewater treatment and Ferrite (Ferrite) treatment technology to remove organic matters and multiple heavy metal ions, and the combination of the technologies is suitable for treating the wastewater generated in the metal surface treatment industry.
2. Avoiding the organic matter from influencing the quality of the ferrite product: wastewater treatment by means of Fiton (Fenton)Can decompose organic matters and reduce the interference on the reaction of the ferrite, and simultaneously residual iron ions after the Feyton wastewater treatment can be used as iron ions for the next step of ferrite treatmentReaction ofAnd (3) preparing.
3. The ratio of ferric to ferrous ions is increased with hydrogen peroxide to accelerate the Ferrite (Ferrite) treatment.
4. The medicines used for wastewater treatment by the Feyton (Fenton) wastewater treatment and Ferrite (Ferrite) treatment technologies mainly comprise ferrous sulfate and hydrogen peroxide, and the medicines have no environmental doubts after reaction.
The invention is mainly characterized in that: the method mainly provides a comprehensive treatment method for organic matter and heavy metal wastewater, which comprises the following steps:
(1) adding appropriate amount of ferrous salt (such as ferrous sulfate, ferrous chloride or ferrous nitrate) and appropriate amount of hydrogen peroxide into the continuously stirred waste liquid to adjust the molar ratio of organic matter to hydrogen peroxide to ferrous ion (such as 1: 20-100: 0.2-10), controlling the temperature of the reaction environment at 20-100 deg.C and pH at 2-5, adjusting the stirring speed at appropriate rotation speed (such as 50-400 rpm), performing a Feyton (Fenton) reaction, monitoring pH and pHORP (Oxidation-reduction potential)When the wastewater is stable, determining the Feiton wastewater treatment end time; typically about 5 to 240 minutes.
After the Feyton reaction, adding a proper amount of ferrous salt to readjust the molar ratio of organic matter to hydrogen peroxide to ferrous ion, for example, 1: 20-100: 30-150, and simultaneously, enabling the molar ratio of ferrous ion to heavy metal ion to be more than 4;
(2) performing ferrite reaction by heating at 20-100 deg.C, adding ferrous salt and alkali agent such as sodium hydroxide or potassium hydroxide, wherein the ferrous salt is added in an amount to maintain the molar ratio of the organic matter to hydrogen peroxide to ferrous ions, and the alkali is added in an amount to adjust the pH value to 8-12, and to concentrate heavy metal ions;
(4) controlling aeration at a proper rate, such as aeration rate of 0.75-4L/min per liter of wastewater to perform a ferrite reaction, monitoring pH and ORP to be stable at the same time, and then terminating the ferrite reaction for about 0-120 min (if all conditions are proper, the reaction time can be extremely short, even if the reaction is immediate and cannot reach one minute, so the reaction time is 0 min), and forming ferrite products;
(5) filtering by a discharge port of the reaction tank and a precipitation tank to separate solid and liquid, and performing heavy metal ion dissolution Test (TCLP) on the solid and liquid respectively, wherein the filtrate obtained after the precipitate is filtered and separated can be recycled to the step (3) for reuse or directly discharged after water quality analysis.
Drawings
FIG. 1 is a flow chart of a method of practicing the present invention;
FIG. 2 is a schematic view of the apparatus of the present invention;
FIG. 3 is a graph of temperature versus reaction time for various stages of the reaction in an example of the invention;
FIG. 4 is a graph of pH versus reaction time for various stages of the reaction in accordance with an embodiment of the present invention;
FIG. 5 is a graph of oxidation-reduction potential versus reaction time for various stages of the reaction in an example of the present invention;
FIG. 6 is an XRD (x-ray diffraction) pattern analysis of the ferrite product obtained in the example of the present invention.
Description of the figure numbering: 1 a water pumping motor; 10 a waste water tank; 2, a stirrer; 3, a reaction tank; 4 an instrument console; 40 a temperature controller; 41, a pH value meter; 42 oxidation-reduction potentiometers; 5, an air flow meter; 6, an air compressor; 7 a heater; 8, discharging a material outlet; 9, a settling tank; p1 ferrite product; w1filtrate.
Detailed Description
The method comprises the steps of sequentially carrying out Feyton and Ferrite (Ferrite) wastewater treatment technologies in the same reaction tank, adjusting the proportion of hydrogen peroxide and ferrous salt, and removing organic matters and heavy metal ions in wastewater before and after respectively at the pH of 2-5 and the temperature of 20-100 ℃ and at the pH of 8-12 and the temperature of 20-100 ℃.
The Feyton waste water treating technology is to use hydrogen peroxide (H)2O2) And divalent iron ions to generate Hydroxyl radicals (OH), and oxidizing the organic substance (R) by the Hydroxyl radicals, according to the reaction formula:
(1)
(2)
(3)
(4)
(5)
(6)
the Ferrite (Ferrite) wastewater treatment technology is to treat the wastewater containing Fe2+AndM n+metal ion (a)M n+ For various metal ions contained in the wastewater) Adding sodium hydroxide to the aqueous solution of (1) to produce a green nonmagnetic M (OH)2And Fe (OH)2Precipitate, M (OH)2And Fe (OH)2Continued reaction to form M2+AndFe2+The metal hydroxy complex (hydroxyl complex) of (a), the reaction formula is:
(7)
(8)
(9)
in the presence of Fe2+And M2+The metal hydroxyl compound aqueous solution of (1) is aerated, and oxygen in the air is dissolved in the solution to form dissolved oxygen [ O]]Mixing Fe2+Is oxidized into Fe3+And reacting with a hydroxy metal complex to form an iron complex (f)errosic complex) of the formula:
[ O]: dissolved oxygen
(10)
Generated byIron complexThen reacting with alkali to generate ferrite, wherein the reaction formula is as follows:
(11)
the overall reaction formula is:
(12)
therefore, the organic matter can be firstly oxidized in the environment of the wastewater treated by the Feyton (Fenton) technology under the acidic condition (pH is 2-5) at the temperature of 20-100 ℃, the decomposition efficiency of the organic matter is excellent, and the residual iron ions after the Feyton wastewater treatment are used as a catalyst to immediately perform the ferrite treatment, so that the conditions of the ferrite reaction are met:under the conditions of 20-100 ℃ and alkaline conditions (pH 8-12), iron ion (including ferrous iron and ferric iron) catalysts in Feiton (Fenton) wastewater treatment become reactants in a ferrite wastewater treatment technology, and form a ferrite product with heavy metals, so that the heavy metal ions in the wastewater form a solid-phase ferrite product, and the ferrite product can be magnetically sorted to improve the solid-liquid separation efficiency.
The method comprises the following implementation steps:
1. firstly, adding ferrous salt and hydrogen peroxide into wastewater, controlling the molar ratio of the organic matter to the hydrogen peroxide to the ferrous ion to be regulated to be [ 1: 20-100: 0.2-10], controlling the temperature to be 20-100 ℃ and the pH value to be 2-5, carrying out reaction under the treatment condition conforming to the Feyton wastewater treatment technology, and decomposing the organic matter by means of hydrogen peroxide under the catalysis of the ferrous ion;
2. the Feiton (Fenton) wastewater treatment in the previous step can increase the ferrous iron ions to form ferric iron ionsThe Ratio of ferric to ferrous ions (Ratio) in the Ferrite (Ferrite) process technology; heating to control the temperature to be 20-100 ℃, then adding ferrous salt to adjust the concentration of ferrous ions in the waste liquid, controlling the molar ratio of the ferrous ions to the heavy metal ions to be more than 4, and enabling the ratio of ferric ions to ferrous ions in the added waste water to be close to the theoretical value of stoichiometric quantity (the ratio of ferric ions to ferrous ions is more than the theoretical value of stoichiometric quantity)Molar ratio of ferric iron to ferrous iron 2)Accelerating the formation of the ferrite;
3. after adjusting the pH value (pH 8-12) by adding alkali liquor (such as sodium hydroxide), accelerating the Ferrite reaction and shortening the reaction time by ventilating under the reaction condition conforming to the Ferrite treatment so as to treat heavy metal ions in the wastewater under the Ferrite formation condition;
4. when the temperature is 20-100 ℃, the pH value is 8-12 and the ORP is>-200mv, a ferrite product can be formed, and when the conditions of the pH value and the ORP parameters are stable, the reaction termination time of the ferrite can be determined; and finally, filtering the ferrite product and the filtrate to perform solid-liquid separation.
The present invention is described below by referring to fig. 1 to 5, and the following embodiments are described in the above steps:
in this example, wastewater generated by surface treatment of a metal containing an organic substance and a heavy metal is treated, and the wastewater contains about 524ppm (0.0044 mol) of an organic substance (phenylazide) and 1078ppm (0.0165 mol) of a heavy metal (zinc ion).
Firstly, carrying out a Fibonon (Fenton) reaction: introducing wastewater from a wastewater tank 10 (1 liter for example) into a reaction tank 3 through a water pump motor 1, continuously stirring the wastewater by activating a stirrer 2, adding ferrous sulfate (i.e., ferrous salt, about 0.0176 mol) into the reaction tank 3 while monitoring a temperature controller 40 at an appropriate temperature (preferably about 30 ℃) by an instrument console 4, adding hydrogen peroxide (about 0.088 mol), controlling a reaction environment under an acidic condition (preferably at a pH of about 2.5) by an alkalinity-acidity meter 41, and adjusting a molar ratio of "organic substance: hydrogen peroxide: ferrous ion" to "1: 20: 4"; as in the following table:
| operating conditions | Phenyl azide | Hydrogen peroxide | Ferrous salt | Temperature (. degree.C.) | pH |
| Fiton waste water treatment Physical conditions | 0.0044 mol | 0.0880 mol | 0.0176 | 30±5 | 2.5 |
The molar ratio of the organic matter (phenylate azide) to the hydrogen peroxide to the ferrous salt is 1: 20: 4
Then, the rotation speed of the stirrer 2 is adjusted (preferably 300rpm) to continue stirring, so that the fibton (Fenton) reaction is carried out for a predetermined time (about 30 minutes according to the conditions of this example), and the hydrogen peroxide is oxidized and decomposed by the ferrous ion catalysis to the organic matter; when the fibton reaction is performed, the instrument console 4 monitors the temperature controller 40, the pH meter 41 and the oxidation-reduction potential meter 42 for detection, and determines the fibton wastewater treatment termination time when the pH and ORP changes stably (please refer to fig. 3-5), wherein the reaction time is about 5-240 minutes according to the difference between the waste liquid concentration, the ratio of organic matter to hydrogen peroxide to ferrous ions, and the like;
(II) carrying out a ferrite reaction: 0.1144 moles of ferrous sulfate (i.e., ferrous salt, which is 0.132 moles of ferrous sulfate added in the feignon reaction and the ferrite reaction) were added to the reactor 3, and the molar ratio of "organic substance to hydrogen peroxide to ferrous ion" was adjusted to 1: 20: 30, at which time the molar ratio of iron ion to zinc ion was 8; heating for twenty minutes by a heater 7 to increase the temperature to 70 +/-5 ℃, adding sodium hydroxide to change the reaction environment under an alkaline condition (adjusting the pH value to 8-12, preferably 11), and concentrating heavy metal ions; as in the following table:
| operating conditions | Phenyl azide | Hydrogen peroxide | Ferrous salt | Temperature (. degree.C.) | pH |
| Ferrite scrap Conditions of water treatment | 0.0044 mol | 0.0880 mol |
0.132 | 70±5 | 11 |
The molar ratio of the organic matter (phenylate azide) to the hydrogen peroxide to the ferrous salt is 1: 20: 30
And (III) ventilating: the aeration rate can be controlled to about 4L/min per liter of wastewater by means of the air compressor 6 and the air flow meter 5, and the change of pH and ORP is detected by the instrument console 4 monitoring temperature controller 40, pH meter 41 and oxidation-reduction potential meter 42 to grasp the ferrite reaction termination time when the change of pH and ORP is stable (please refer to the chart shown in FIGS. 3-5, the ferrite reaction is performed according to the embodiment, ferrite products can be formed when the temperature is 70 + -5 ℃, pH is 11, ORP is>-200mv, and the ferrite reaction is stable for only 18 min);
(IV) solid-liquid separation: conveying the ferrite product P1 and the filtrate W1 to a precipitation tank 9 from a discharge port 8, standing, filtering and separating; and performing a ferrite product heavy metal ion dissolution Test (TCLP) to obtain a ferrite product P1, performing water quality analysis on the filtrate, filtering and separating to obtain a filtrate W1 which can be recycled (to the third step)for reuse, or performing water quality analysis and pH adjustment to meet the effluent standard and then directly discharging.
According to the embodiment of the invention, after the wastewater is subjected to the above-mentioned fiyton (Fenton) and Ferrite (Ferrite) comprehensive wastewater treatment technology, the water quality and product analysis results are shown in the following table:
water quality and product analysis table:
| analysis item | Phenyl azide | Total organic carbon | Zinc ion |
| Waste water quality (ppm) | 523.60 | 734.70 | 1078.00 |
| Fiton and ferrite wastewater Treated Water quality (ppm) | 26.70 | 445.10 | 0.04 |
| Removal efficiency (%) | 94.80 | 39.40 | 99.99 |
| Ferrite product TCLP Dissolution test | - | - | 10.94 |
Iron sludge reduction analysis table:
| analysis item | Concentration of iron ion |
| Feiton wastewater treatment (ppm) | 923.00 |
| Waste water quality (ppm) after Feyton and ferrite treatment | 0.07 |
| Iron sludge reduction (%) | 99.99 |
From the results, it was found that, in the case of water quality analysis after wastewater was treated with a fibon (Fenton) and Ferrite (Ferrite) combined wastewater, the removal efficiency of organic phenylazide reached 94.8%, the removal efficiency of TOC (total organic carbon) reached 39.4%, the removal efficiency of zinc ions reached 99.99%, and the reduction amount of iron sludge reached 99.99% (as the result of iron ion analysis by Ferrite treatment in the product analysis in the above table), and in the case of solid-phase product analysis, the TCLP elution test analysis value of zinc ions was 10.94ppm, showing that the elution amount was low, and the formed solid-phase product was identified as Ferrite (Ferrite) by the crystal phase identification (as shown in fig. 6, XRD pattern analysis of Ferrite product).
Claims (9)
1. A comprehensive treatment method for wastewater containing organic matters and heavy metals is characterized by comprising the following steps:
(1) adding a proper amount of ferrous salt and a proper amount of hydrogen peroxide into the continuously stirred waste liquid to adjust the state of organic matter, hydrogen peroxide and ferrous ions in a proper molar ratio, controlling the temperature of a reaction environment to be 20-100 ℃, controlling the pH value to be 2-5, adjusting the stirring speed to be a proper rotating speed, carrying out a Fiton (Fenton) reaction, and determining the Fiton waste water treatment finishing time when the pH and the ORP are stable;
(2) after the Feyton reaction, adding a proper amount of ferrous salt to readjust the molar ratio of organic matter to hydrogen peroxide to ferrous ion, and simultaneously ensuring that the molar ratio of ferrous ion to heavy metal ion is more than 4;
(3) heating the ferrite reaction to control the temperature to be 20-100 ℃, simultaneously adding ferrous salt and an alkaline agent to maintain the molar ratio of the organic matter to the hydrogen peroxide to the ferrous ion in the previous step, adjusting the pH value to be 8-12, and concentrating heavy metal ions;
(4) ventilating: controlling aeration at a proper rate to perform a ferrite reaction, monitoring pH and ORP, and stopping the ferrite reaction time when the pH and ORP are stable and a ferrite product is formed;
(5) filtering by a discharge port of the reaction tank and a precipitation tank to separate solid and liquid, and performing a heavy metal ion dissolution Test (TCLP) on the precipitate respectively, wherein the filtrate obtained after the precipitate is filtered and separated can be recycled to the step (3) for reuse or directly discharged after water quality analysis.
2. The method for comprehensive treatment of organic matter and heavy metal wastewater as claimed in claim 1, wherein the ferrous salt in step (1) is ferrous sulfate, ferrous chloride or ferrous nitrate.
3. The method according to claim 1, wherein the molar ratio of the organic substances to the hydrogen peroxide to the ferrous ions in the step (1) is controlled to be 1: 20 to 100: 0.2 to 10.
4. The comprehensive treatment method of organic matter and heavy metal wastewater as claimed in claim 1, wherein the stirring speed for the Fibonon reaction in step (1) is controlled to be 50-400 rpm.
5. The comprehensive treatment method of organic matter and heavy metal wastewater as recited in claim 1, wherein the condition of the fiyton reaction termination time in step (1) is that when the parameters such as pH and ORP are stable, the fiyton reaction can be terminated within about 5-240 minutes.
6. The comprehensive treatment method of organic matter and heavy metal wastewater as claimed in claim 1, wherein the molar ratio of the organic matter, hydrogen peroxide and ferrous ion in step (2) is adjusted to 1: 20-100: 30-150.
7. The method for comprehensive treatment of organic matter and heavy metal wastewater as claimed in claim 1, wherein the alkaline agent in step (3) is sodium hydroxide or potassium hydroxide.
8. The comprehensive treatment method of organic matter and heavy metal wastewater as claimed in claim 1, wherein aeration per liter of wastewater in aeration in step (4) is 0.75-4 liters per minute.
9. The comprehensive treatment method of organic matters and heavy metal wastewater as claimed in claim 1, wherein the ferrite reaction in step (4) can be stopped when the pH and ORP are stable, and the reaction time is about 0-120 min.
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| CN102603103A (en) * | 2012-04-10 | 2012-07-25 | 东莞市珠江海咸水淡化研究所 | Complex heavy-metal waste water emergency quick treatment method |
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| CN105601011A (en) * | 2015-12-03 | 2016-05-25 | 长沙南方宇航环境工程有限公司 | Method and apparatus for treating copper-containing electroplating wastewater and recovering copper |
| CN107324587A (en) * | 2017-07-12 | 2017-11-07 | 同济大学 | A kind of synchronous method for removing heavy metal in waste water and organic matter |
| CN107324587B (en) * | 2017-07-12 | 2020-08-18 | 同济大学 | A method for simultaneous removal of heavy metals and organic matter in wastewater |
| CN109824128A (en) * | 2019-04-03 | 2019-05-31 | 东北师范大学 | A kind of method for removing heavy metal ions in waste acid |
| CN109824128B (en) * | 2019-04-03 | 2021-09-24 | 东北师范大学 | A kind of method for removing heavy metal ions in waste acid |
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