CN103693728A - Pre-treatment technology of wastewater containing phosphorus and nickel - Google Patents
Pre-treatment technology of wastewater containing phosphorus and nickel Download PDFInfo
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- CN103693728A CN103693728A CN201410006759.0A CN201410006759A CN103693728A CN 103693728 A CN103693728 A CN 103693728A CN 201410006759 A CN201410006759 A CN 201410006759A CN 103693728 A CN103693728 A CN 103693728A
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Abstract
The invention relates to a pre-treatment technology of wastewater containing phosphorus and nickel. The technology comprises the following steps: 1, adjusting the PH value of the wastewater in a colleting pond to 6-7; 2, pumping the waste of which the PH value is adjusted to a reaction pond, and adding lime to the reaction pond to adjust the PH value to strong basicity; 3, pumping strong alkaline wastewater to a settling pond, and adding an agent to carry out precipitation reaction and flocculation reaction; and 4, carrying out solid-liquid separation, and separating out the sediment to obtain the purified wastewater, and discharging up to the standard. By adopting the pretreatment technology of the wastewater containing phosphorus and nickel, which is disclosed by the invention, the wastewater is pumped to the collecting pond; the PH value is adjusted to 6-7; the wastewater is then pumped to the reaction tank; the pump for adding lime and a PH pump inside the reaction tank are connected in parallel to control the reaction tank to automatically add lime to adjust the PH value to 11.5, so that the settled sludge is less, the lime impurities do not precipitate inside the collecting pond, and the wastewater treatment cost is reduced.
Description
Technical field
The present invention relates to a kind of waste water treatment process, relate in particular to a kind of pretreatment technology of phosphorous, nickel waste water.
Background technology
Chemical nickel plating is the process for treating surface of a kind of effective raising workpiece solidity to corrosion and wear resistance, has been widely used in the many industries that comprise printed circuit board (pcb), five metals plating and chemical engineering industry; Along with the continuous variation adjustment of the industrial structure, as constantly entering of the metal finishing industry such as automobile industry, communications service production, the phosphating process of metallic surface is generally adopted.Thereby bring the high-concentration waste waters such as a large amount of phosphorous, nickel.At present China's water body because of phosphorus content comparatively serious compared with the high eutrophy phenomenon causing, and nickel ion is that in national wastewater discharge standard, the first kind is forbidden the arbitrarily pollutent of discharge, because it can put aside in environment and animal and plant body, HUMAN HEALTH is produced to permanent detrimentally affect, therefore, the waste water that contains the materials such as phosphorus, nickel, could discharge after must be treated up to standard.
Conventional phosphorous, nickel waste water treatment process is chemical precipitation method at present, normally phosphorous, nickel waste water beaten to collecting tank, adds lime more than 11, to add source of the gas aeration even to pH value, then gets to reaction tank dosing and process.This treatment process easily causes lime contamination precipitation in collecting tank, and the sludge quantity of processing after precipitation increases at double, need to consume a large amount of manpower and materials, increases cost for wastewater treatment.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, and a kind of waste water treatment process that rear sludge quantity is few, avoid lime impurity to precipitate in collecting tank that precipitates is provided.
For achieving the above object, the technical solution used in the present invention is: a kind of pretreatment technology of phosphorous, nickel waste water, is characterized in that: comprise the steps;
The first step: regulate the pH value of waste water in collecting tank to 6-7;
Second step: by regulating pH value waste water afterwards to beat to reaction tank, add lime to pH value to be strong basicity in reaction tank;
The 3rd step: strong basicity waste water is beaten to settling tank, added medicament and carry out precipitin reaction and flocculation reaction;
The 4th step; Solid-liquid separation, isolates the waste water being purified after throw out, qualified discharge.
In a preferred embodiment of the present invention, further comprise in described second step that to adding lime to pH value in reaction tank be 11.5, by automatically to add lime to pH value be 11.5 by adding the pump of lime and PH probe parallel control reaction tank.
In a preferred embodiment of the present invention, under the condition that further to comprise in described the 3rd step be 11.5 at pH value, to dosing coagulant PAC in settling tank, carry out precipitin reaction, make phosphorus, nickel respectively form stable de-steady colloid.
In a preferred embodiment of the present invention, when further comprising in described the 3rd step precipitin reaction, add flocculation agent PAM and carry out flocculation reaction, make de-steady colloid contact with each other generation flocs unit.
In a preferred embodiment of the present invention, further comprise that described settling tank is tube settler.
In a preferred embodiment of the present invention, further comprise that described the 4th step sedimentation in tube settler completes solid-liquid separation, the waste water being purified and solid-liquid enriched material, the discharged wastewater met the national standard of purification.
In a preferred embodiment of the present invention, further comprise in described the 3rd step at normal temperatures to dosing coagulant PAC in settling tank and carry out precipitin reaction 30min.
In a preferred embodiment of the present invention, when further comprising in described the 3rd step precipitin reaction, add at normal temperatures flocculation agent PAM and carry out flocculation reaction 30min.
The invention solves the defect existing in background technology, the pretreatment technology of phosphorous, nickel waste water of the present invention is by beating waste water to collecting tank, regulate pH value to 6-7, beat again to reaction tank, by by adding the pump of lime and PH probe parallel control reaction tank in reaction tank, automatically to add lime to pH value be 11.5, after precipitation, sludge quantity is few, also can not cause lime impurity to precipitate in collecting tank, has reduced cost for wastewater treatment.
Embodiment
The present invention is further detailed explanation in conjunction with the embodiments now.
The invention provides a kind of pretreatment technology of phosphorous, nickel waste water, this technique is to utilize the precipitation that generates oxyhydroxide to process, and is by dosing in reaction tank and regulates pH value to be after strong basicity, enters that settling tank sedimentation completes, and comprises the steps;
The first step: first regulate the pH value of waste water in collecting tank to 6-7 with alkali lye;
Second step: by regulating pH value waste water afterwards to beat to reaction tank, add lime to pH value to be strong basicity in reaction tank;
The 3rd step: strong basicity waste water is beaten to settling tank, added medicament and carry out precipitin reaction and flocculation reaction;
The 4th step; Solid-liquid separation, isolates the waste water being purified after throw out, qualified discharge.
Preferably, in second step, to adding lime to pH value in reaction tank, be 11.5, specifically by automatically adding lime to pH value and be 11.5 adding the pump of lime and PH probe parallel control reaction tank, easy to operate, the pH value in reaction tank easy to control.
Concrete, under the condition that is 11.5 at pH value in the 3rd step, to dosing coagulant PAC in settling tank, carry out precipitin reaction, make phosphorus, nickel respectively form stable de-steady colloid, specifically to dosing coagulant PAC in settling tank, carry out precipitin reaction 30min at normal temperatures; In precipitin reaction, add flocculation agent PAM and carry out flocculation reaction, make de-steady colloid contact with each other generation flocs unit, specifically add at normal temperatures flocculation agent PAM simultaneously and carry out flocculation reaction 30min.
Settling tank in the present invention is tube settler, and the 4th step is that sedimentation completes solid-liquid separation in tube settler, and the waste water being purified and solid-liquid enriched material reach chemical dephosphorization and except the object of nickel, the discharged wastewater met the national standard of purification.Tube settler, is convenient to sewage and the solid-liquid enriched material of isolation of purified better.
In waste water due to high density, contain phosphorus and nickel ion, utilize wastewater preprocessing process of the present invention, first with alkali lye, regulating the pH value of waste water in collecting tank is 6-7, because raw wastewater pH value is in 2 left and right in collecting tank, first add liquid caustic soda and adjust pH value 6-7, the pH value that subsequent reactions pond adds after lime reaches rapidly 11.5, sludge quantity reduces, if pH value is higher than more than 7, subsequent reactions pond flocculating effect is poor, and although pH value is good lower than 6 reaction tank effects, but can cause sludge quantity to increase, therefore, needing to regulate the pH value of waste water in collecting tank is that 6-7 carries out pre-treatment to waste water, after making post precipitation, sludge quantity is few, again waste water is beaten to reaction tank, under this pH value condition, to dosing coagulant PAC in waste water, carried out precipitin reaction, make phosphonium ion and nickel ion generate corresponding phosphoric acid salt and nickel hydroxide precipitate thing, remove phosphorus and nickel in waste water, because sedimentary particle is very tiny, separation difficulty, in precipitin reaction and add appropriate flocculation agent PAM and carry out flocculation reaction, flocculation agent PAM and phosphoric acid salt form the material of particulate state, non-solubility, make the throw out producing become large and accelerate the settling velocity of throw out in settling tank, reduce the suspended substance that precipitation water outlet is taken out of.While utilizing precipitin reaction, in waste water, add deliquescent flocculation agent PAM, make deliquescent phosphate transfection change the phosphoric acid salt of non-solubility on the one hand, produce the oxyhydroxide of non-solubility simultaneously, on the other hand, because pH value is controlled at 11.5, along with sedimentary increase and less non-solubility solids are built up into larger non-solubility solids, make stable elimination of colloid stability, Negotiation speed gradient or diffusion process make de-steady colloid contact with each other generation flocs unit, finally pass through solid-liquid separation step, the waste water being purified and solid-liquid enriched material (chemical sludge), reach chemical dephosphorization and except the object of nickel, the waste water purifying can reach Taihu Lake basin emission standard.
In the present invention, precipitin reaction is carried out in settling tank, also can in passing into the inlet channel of settling tank (pipe), carry out precipitin reaction by dosing coagulant, need to arrange and produce the device of eddy current or supply with energy to meet the needs of mixing, in settling tank, add flocculation agent to carry out flocculation reaction, the precipitated product (large block flocs unit) producing is separated by precipitation in settling tank, reach chemical dephosphorization and except the object of nickel, to reduce the pollution to environment.
The pretreatment technology of phosphorous, nickel waste water of the present invention is by beating waste water to collecting tank, regulate pH value to 6-7, beat again to reaction tank, by by adding the pump of lime and PH probe parallel control reaction tank in reaction tank, automatically to add lime to pH value be 11.5, after precipitation, sludge quantity is few, can not cause lime impurity to precipitate in collecting tank, reduce cost for wastewater treatment yet.
Above foundation desirable embodiment of the present invention is enlightenment, and by above-mentioned description, related personnel can, within not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on specification sheets, must determine technical scope according to claim scope.
Claims (8)
1. a pretreatment technology for phosphorous, nickel waste water, is characterized in that: comprise the steps;
The first step: regulate the pH value of waste water in collecting tank to 6-7;
Second step: by regulating pH value waste water afterwards to beat to reaction tank, add lime to pH value to be strong basicity in reaction tank;
The 3rd step: strong basicity waste water is beaten to settling tank, added medicament and carry out precipitin reaction and flocculation reaction;
The 4th step; Solid-liquid separation, isolates the waste water being purified after throw out, qualified discharge.
2. the pretreatment technology of a kind of phosphorous, nickel waste water according to claim 1, it is characterized in that: in described second step, to adding lime to pH value in reaction tank, be 11.5, by by adding the pump of lime and PH probe parallel control reaction tank, automatically to add lime to pH value be 11.5.
3. the pretreatment technology of a kind of phosphorous, nickel waste water according to claim 2, it is characterized in that: under the condition that is 11.5 at pH value in described the 3rd step, to dosing coagulant PAC in settling tank, carry out precipitin reaction, make phosphorus, nickel respectively form stable de-steady colloid.
4. the pretreatment technology of a kind of phosphorous, nickel waste water according to claim 3, is characterized in that: in described the 3rd step, add flocculation agent PAM when precipitin reaction and carry out flocculation reaction, make de-steady colloid contact with each other generation flocs unit.
5. the pretreatment technology of a kind of phosphorous, nickel waste water according to claim 4, is characterized in that: described settling tank is tube settler.
6. the pretreatment technology of a kind of phosphorous, nickel waste water according to claim 5, is characterized in that: described the 4th step sedimentation in tube settler completes solid-liquid separation, the waste water being purified and solid-liquid enriched material, the discharged wastewater met the national standard of purification.
7. the pretreatment technology of a kind of phosphorous, nickel waste water according to claim 6, is characterized in that: in described the 3rd step, carry out precipitin reaction 30min at normal temperatures to dosing coagulant PAC in settling tank.
8. the pretreatment technology of a kind of phosphorous, nickel waste water according to claim 7, is characterized in that: in described the 3rd step, add at normal temperatures flocculation agent PAM when precipitin reaction and carry out flocculation reaction 30min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410006759.0A CN103693728A (en) | 2014-01-08 | 2014-01-08 | Pre-treatment technology of wastewater containing phosphorus and nickel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410006759.0A CN103693728A (en) | 2014-01-08 | 2014-01-08 | Pre-treatment technology of wastewater containing phosphorus and nickel |
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| CN103693728A true CN103693728A (en) | 2014-04-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106277442A (en) * | 2016-08-24 | 2017-01-04 | 江山市双氧水有限公司 | A kind of Hydrogen Peroxide Production Wastewater Pretreatment dephosphorization and Organic substance device |
| CN111018185A (en) * | 2019-12-21 | 2020-04-17 | 江苏剑桥涂装工程股份有限公司 | Phosphating wastewater treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57127485A (en) * | 1981-01-27 | 1982-08-07 | Suido Kiko Kk | Method for removal of phosphorus dissolved in water |
| CN101549919A (en) * | 2008-03-31 | 2009-10-07 | 邵琳 | Method for treating electroplating integrated waste water |
| CN102701542A (en) * | 2012-06-29 | 2012-10-03 | 浙江商达环保有限公司 | Method for treating sewage containing cyanogen, nickel and fluorine |
-
2014
- 2014-01-08 CN CN201410006759.0A patent/CN103693728A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57127485A (en) * | 1981-01-27 | 1982-08-07 | Suido Kiko Kk | Method for removal of phosphorus dissolved in water |
| CN101549919A (en) * | 2008-03-31 | 2009-10-07 | 邵琳 | Method for treating electroplating integrated waste water |
| CN102701542A (en) * | 2012-06-29 | 2012-10-03 | 浙江商达环保有限公司 | Method for treating sewage containing cyanogen, nickel and fluorine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106277442A (en) * | 2016-08-24 | 2017-01-04 | 江山市双氧水有限公司 | A kind of Hydrogen Peroxide Production Wastewater Pretreatment dephosphorization and Organic substance device |
| CN111018185A (en) * | 2019-12-21 | 2020-04-17 | 江苏剑桥涂装工程股份有限公司 | Phosphating wastewater treatment method |
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Application publication date: 20140402 |