CN102190385A - Processing and recycling method of waste water discharged from stainless steel pickling process - Google Patents
Processing and recycling method of waste water discharged from stainless steel pickling process Download PDFInfo
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Abstract
The invention discloses a processing and recycling method of waste water discharged from a stainless steel pickling process. The method comprises the following steps that: waste water discharged from a stainless steel pickling process is pre-treated and sequentially pumped into a first reaction tank and a first sedimentation tank, lime cream and a coagulant aid are added, and fluorinions in the waste water are removed by sedimentation; the resulting water from the first sedimentation tank is pumped into an oxidation tank, and Fe<2+> in the waste water is oxidized into Fe<3+> through aeration; the resulting water from the oxidation tank is sequentially pumped into a second reaction tank and a second sedimentation tank, lye and a coagulant aid are added, and heavy metal ions such as Cr<3+>, Fe<3+> and Ni<2+> are removed by sedimentation; the resulting water from the second sedimentation tank is sequentially pumped into a pH back regulating tank, a middle water tank and a sand filter for carrying out a profound treatment, and the filtered water can be reused directly; Sludge in the first sedimentation tank and the second sedimentation tank is pumped into a sludge thickener, and is dehydrated by press filtering; sludge supernatant, filtrate and sand filter backwashing water are pumped into a regulating tank for a cycling treatment. According to the present invention, a graded processing measurement upon stainless steel pickling waste water is adopted, and standardized waste water discharging and recycling are realized. With the method provided by the present invention, a secondary pollution is avoided. The method is economical, and has good applicability.
Description
Technical field
The invention belongs to field of environment engineering technology, relate to a kind of stainless steel acid cleaning waste water and handle and recycling method.
Background technology
Along with society and rapid economy development, stainless steel and goods thereof are widely used because of its superior corrosion resistance and good surface appearance.Because of stainless steel in process of production, the courses of processing such as annealed inevitably, normalizing, quenching, welding, regular meeting produces the oxide skin of black during the surface.Oxide skin not only influences stainless visual appearance, also can the following process of product be had a negative impact, so must adopt surface treatment methods such as pickling, polishing to be removed before following process.In this process, produced and contained F in a large number
-, Cr
6+, Cr
3+, Fe
3+, Fe
2+And Ni
2+Pickling waste waters, this class waste water such as direct discharging, serious threat is healthy to peripheral ecotope and resident.Therefore, strengthen the prevention and cure of pollution of stainless steel acid cleaning waste water,, push forward China's ecological environmental protection work comprehensively for the sound development that ensures the stainless steel industry, significant.
Strengthening stainless steel acid cleaning waste water processing and reuse is the important channel that the sector is implemented prevention and cure of pollution.Traditional treatment process mainly contains chemical precipitation method, oxidation reduction process etc., promptly the precipitation by metallic ion in the waste water is removed by adding flocculation agent or alkali lye, this method has low, the simple operation and other advantages of investment, but also has problems such as treatment effect is general, wastewater discharge is big, secondary pollution is serious.In recent years, various new techniques such as absorption method, electrochemical reducing, membrane processing method have obtained research, but problems such as the ubiquity investment is big, processing cost height are difficult to industry and promote.Therefore, the economical and efficient processing and the reuse technology research of reinforcement stainless steel acid cleaning waste water are imperative.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, provide a kind of stainless steel acid cleaning waste water efficient, stable, that secondary pollution is little to handle and recycling method.
The step of stainless steel acid cleaning waste water processing and reuse method is as follows:
1) stainless steel acid cleaning waste water pumps into equalizing tank, carries out water yield matter and water homogenizing and handles, and hydraulic detention time is 2～3h;
2) the equalizing tank water outlet is pumped into the first order reaction pond, regulate pH to 6.5, add calcium chloride, make most of fluorion reaction generation CaF in the waste water by adding milk of lime
2, the polyacrylamide that adds weight percentage then and be 0.2～0.5g/L flocculates, and the reaction tank hydraulic detention time is 0.5～1h;
3) water outlet of first order reaction pond is pumped into the one-level settling tank, hydraulic detention time is 1～2h, and precipitating sludge pumps into sludge thickener;
4) water outlet of one-level settling tank is pumped into oxidation pond, carry out the aeration oxidation, make the Fe in the waste water
2+Be oxidized to Fe
3+, hydraulic detention time is 0.5～1h;
5) the oxidation pond water outlet is pumped into the second order reaction pond, by adding sodium hydroxide pH is transferred to 9.3, add weight percentage simultaneously and be respectively polymerize aluminum chloride and the polyacrylamide of 1～1.5g/L and 0.2～0.5g/L, make under the stirring of stirrer that each metal ion reaction generates precipitation of hydroxide in the waste water;
6) water outlet of second order reaction pond is pumped into second-level settling pond, hydraulic detention time is 3～5h, and precipitating sludge pumps into sludge thickener;
7) the second-level settling pond water outlet is pumped into pH readjustment pond, by adding sulfuric acid pH is transferred to 6.5, hydraulic detention time is 1～1.5h;
8) pH is adjusted back the pond water outlet and pump into intermediate pool, hydraulic detention time is 1～1.5h;
9) the intermediate pool water outlet is pumped into sand filter, hydraulic detention time is 2～4h, and backwashing wastewater pumps into the equalizing tank circular treatment, but sand filter water outlet direct reuse;
10) mud in the sludge thickener dewaters through filter press, obtains water ratio and be 40～60% mud, and the mud outward transport is disposed, and mud supernatant liquor and filtrate pump into the equalizing tank circular treatment.
Described first order reaction pond, one-level settling tank are used to remove F
-, oxidation pond, second order reaction pond and second-level settling pond are used to remove Cr
3+, Fe
3+, Ni
2+, and pH readjustment pond, intermediate pool and sand filter are used for the advanced treatment and the reuse of waste water.
Compared with prior art, useful result of the present invention is: efficient, stable, secondary pollution is little, indexs such as the total chromium in system's water outlet, total nickel, fluorochemical, pH reach " integrated wastewater discharge standard " (GB8978-1996) first discharge standard and reuse standard.
Description of drawings
Fig. 1 is the process flow sheet of the inventive method.
Embodiment
Further specify the present invention below in conjunction with embodiment.
Embodiment 1:
1) stainless steel acid cleaning waste water, the water yield are 1000m
3/ d, water quality is as follows: pH is 1.2, COD
CrBe 145mg/L, total chromium is 420mg/L, and total iron is 750mg/L, Ni
2+Be 300mg/L, F-is 650mg/L, and SS is 160mg/L, and waste water pumps into equalizing tank, carries out water yield matter and water homogenizing and handles, and hydraulic detention time is 2h;
2) the equalizing tank water outlet is pumped into the first order reaction pond, regulate pH to 6.5, add calcium chloride, make most of fluorion reaction generation CaF in the waste water by adding milk of lime
2, the polyacrylamide that adds weight percentage then and be 0.2g/L flocculates, and the reaction tank hydraulic detention time is 0.5h;
3) water outlet of first order reaction pond is pumped into the one-level settling tank, hydraulic detention time is 1h, and precipitating sludge pumps into sludge thickener;
4) water outlet of one-level settling tank is pumped into oxidation pond, carry out the aeration oxidation, make the Fe in the waste water
2+Be oxidized to Fe
3+, hydraulic detention time is 0.5h;
5) the oxidation pond water outlet is pumped into the second order reaction pond, by adding sodium hydroxide pH is transferred to 9.3, add weight percentage simultaneously and be respectively polymerize aluminum chloride and the polyacrylamide of 1g/L and 0.2g/L, make under the stirring of stirrer that each metal ion reaction generates precipitation of hydroxide in the waste water;
6) water outlet of second order reaction pond is pumped into second-level settling pond, hydraulic detention time is 3h, and precipitating sludge pumps into sludge thickener;
7) the second-level settling pond water outlet is pumped into pH readjustment pond, by adding sulfuric acid pH is transferred to 6.5, hydraulic detention time is 1h;
8) pH is adjusted back the pond water outlet and pump into intermediate pool, hydraulic detention time is 1h;
9) the intermediate pool water outlet is pumped into sand filter, hydraulic detention time is 2h, and backwashing wastewater pumps into the equalizing tank circular treatment, and the sand filter effluent quality is as follows: pH is 6.4, COD
CrBe 85mg/L, total chromium is 1mg/L, and total iron is 1.6mg/L, Ni
2+Be 0.8mg/L, F-is 8mg/L, and SS is 10mg/L, but sand filter water outlet direct reuse;
10) mud in the sludge thickener dewaters through filter press, obtains water ratio and be 50% mud, and the mud outward transport is disposed, and mud supernatant liquor and filtrate pump into the equalizing tank circular treatment.
Embodiment 2:
1) stainless steel acid cleaning waste water, the water yield are 800m
3/ d, water quality is as follows: pH is 1.5, COD
CrBe 126mg/L, total chromium is 362mg/L, and total iron is 580mg/L, Ni
2+Be 244mg/L, F-is 765mg/L, and SS is 186mg/L, and waste water pumps into equalizing tank, carries out water yield matter and water homogenizing and handles, and hydraulic detention time is 2h;
2) the equalizing tank water outlet is pumped into the first order reaction pond, regulate pH to 6.5, add calcium chloride, make most of fluorion reaction generation CaF in the waste water by adding milk of lime
2, the polyacrylamide that adds weight percentage then and be 0.2g/L flocculates, and the reaction tank hydraulic detention time is 0.7h;
3) water outlet of first order reaction pond is pumped into the one-level settling tank, hydraulic detention time is 1.5h, and precipitating sludge pumps into sludge thickener;
4) water outlet of one-level settling tank is pumped into oxidation pond, carry out the aeration oxidation, make the Fe in the waste water
2+Be oxidized to Fe
3+, hydraulic detention time is 0.6h;
5) the oxidation pond water outlet is pumped into the second order reaction pond, by adding sodium hydroxide pH is transferred to 9.3, add weight percentage simultaneously and be respectively polymerize aluminum chloride and the polyacrylamide of 1g/L and 0.2g/L, make under the stirring of stirrer that each metal ion reaction generates precipitation of hydroxide in the waste water;
6) water outlet of second order reaction pond is pumped into second-level settling pond, hydraulic detention time is 3.5h, and precipitating sludge pumps into sludge thickener;
7) the second-level settling pond water outlet is pumped into pH readjustment pond, by adding sulfuric acid pH is transferred to 6.5, hydraulic detention time is 1h;
8) pH is adjusted back the pond water outlet and pump into intermediate pool, hydraulic detention time is 1h;
9) the intermediate pool water outlet is pumped into sand filter, hydraulic detention time is 3h, and backwashing wastewater pumps into the equalizing tank circular treatment, and the sand filter effluent quality is as follows: pH is 6.6, COD
CrBe 92mg/L, total chromium is 1.4mg/L, and total iron is 1.2mg/L, Ni
2+Be 0.6mg/L, F-is 9mg/L, and SS is 9mg/L, but sand filter water outlet direct reuse;
10) mud in the sludge thickener dewaters through filter press, obtains water ratio and be 55% mud, and the mud outward transport is disposed, and mud supernatant liquor and filtrate pump into the equalizing tank circular treatment.
Embodiment 3:
1) stainless steel acid cleaning waste water, the water yield are 640m
3/ d, water quality is as follows: pH is 1.8, COD
CrBe 164mg/L, total chromium is 372mg/L, and total iron is 850mg/L, Ni
2+Be 350mg/L, F-is 850mg/L, and SS is 196mg/L, and waste water pumps into equalizing tank, carries out water yield matter and water homogenizing and handles, and hydraulic detention time is 2h;
2) the equalizing tank water outlet is pumped into the first order reaction pond, regulate pH to 6.5, add calcium chloride, make most of fluorion reaction generation CaF in the waste water by adding milk of lime
2, the polyacrylamide that adds weight percentage then and be 0.2g/L flocculates, and the reaction tank hydraulic detention time is 0.8h;
3) water outlet of first order reaction pond is pumped into the one-level settling tank, hydraulic detention time is 1h, and precipitating sludge pumps into sludge thickener;
4) water outlet of one-level settling tank is pumped into oxidation pond, carry out the aeration oxidation, make the Fe in the waste water
2+Be oxidized to Fe
3+, hydraulic detention time is 0.5h;
5) the oxidation pond water outlet is pumped into the second order reaction pond, by adding sodium hydroxide pH is transferred to 9.3, add weight percentage simultaneously and be respectively polymerize aluminum chloride and the polyacrylamide of 1g/L and 0.2g/L, make under the stirring of stirrer that each metal ion reaction generates precipitation of hydroxide in the waste water;
6) water outlet of second order reaction pond is pumped into second-level settling pond, hydraulic detention time is 3h, and precipitating sludge pumps into sludge thickener;
7) the second-level settling pond water outlet is pumped into pH readjustment pond, by adding sulfuric acid pH is transferred to 6.5, hydraulic detention time is 1h;
8) pH is adjusted back the pond water outlet and pump into intermediate pool, hydraulic detention time is 1h;
9) the intermediate pool water outlet is pumped into sand filter, hydraulic detention time is 2.5h, and backwashing wastewater pumps into the equalizing tank circular treatment, and the sand filter effluent quality is as follows: pH is 6.7, COD
CrBe 90mg/L, total chromium is 0.9mg/L, and total iron is 1.7mg/L, Ni
2+Be 0.5mg/L, F-is 6mg/L, and SS is 5mg/L, but sand filter water outlet direct reuse;
10) mud in the sludge thickener dewaters through filter press, obtains water ratio and be 48% mud, and the mud outward transport is disposed, and mud supernatant liquor and filtrate pump into the equalizing tank circular treatment.
Embodiment 4:
1) stainless steel acid cleaning waste water, the water yield are 1500m
3/ d, water quality is as follows: pH is 1.1, COD
CrBe 185mg/L, total chromium is 243mg/L, and total iron is 586mg/L, Ni
2+Be 275mg/L, F-is 835mg/L, and SS is 130mg/L, and waste water pumps into equalizing tank, carries out water yield matter and water homogenizing and handles, and hydraulic detention time is 2h;
2) the equalizing tank water outlet is pumped into the first order reaction pond, regulate pH to 6.5, add calcium chloride, make most of fluorion reaction generation CaF in the waste water by adding milk of lime
2, the polyacrylamide that adds weight percentage then and be 0.2g/L flocculates, and the reaction tank hydraulic detention time is 1h;
3) water outlet of first order reaction pond is pumped into the one-level settling tank, hydraulic detention time is 1.2h, and precipitating sludge pumps into sludge thickener;
4) water outlet of one-level settling tank is pumped into oxidation pond, carry out the aeration oxidation, make the Fe in the waste water
2+Be oxidized to Fe
3+, hydraulic detention time is 0.6h;
5) the oxidation pond water outlet is pumped into the second order reaction pond, by adding sodium hydroxide pH is transferred to 9.3, add weight percentage simultaneously and be respectively polymerize aluminum chloride and the polyacrylamide of 1g/L and 0.2g/L, make under the stirring of stirrer that each metal ion reaction generates precipitation of hydroxide in the waste water;
6) water outlet of second order reaction pond is pumped into second-level settling pond, hydraulic detention time is 3.2h, and precipitating sludge pumps into sludge thickener;
7) the second-level settling pond water outlet is pumped into pH readjustment pond, by adding sulfuric acid pH is transferred to 6.5, hydraulic detention time is 1h;
8) pH is adjusted back the pond water outlet and pump into intermediate pool, hydraulic detention time is 1h;
9) the intermediate pool water outlet is pumped into sand filter, hydraulic detention time is 2.5h, and backwashing wastewater pumps into the equalizing tank circular treatment, and the sand filter effluent quality is as follows: pH is 6.8, COD
CrBe 62mg/L, total chromium is 1.1mg/L, and total iron is 1.2mg/L, Ni
2+Be 0.4mg/L, F-is 9mg/L, and SS is 6mg/L, but sand filter water outlet direct reuse;
10) mud in the sludge thickener dewaters through filter press, obtains water ratio and be 55% mud, and the mud outward transport is disposed, and mud supernatant liquor and filtrate pump into the equalizing tank circular treatment.
Claims (2)
1. a stainless steel acid cleaning waste water is handled and recycling method, it is characterized in that its step is as follows:
1) stainless steel acid cleaning waste water pumps into equalizing tank, carries out water yield matter and water homogenizing and handles, and hydraulic detention time is 2～3h;
2) the equalizing tank water outlet is pumped into the first order reaction pond, regulate pH to 6.5, add calcium chloride, make most of fluorion reaction generation CaF in the waste water by adding milk of lime
2, the polyacrylamide that adds weight percentage then and be 0.2～0.5g/L flocculates, and the reaction tank hydraulic detention time is 0.5～1h;
3) water outlet of first order reaction pond is pumped into the one-level settling tank, hydraulic detention time is 1～2h, and precipitating sludge pumps into sludge thickener;
4) water outlet of one-level settling tank is pumped into oxidation pond, carry out the aeration oxidation, make the Fe in the waste water
2+Be oxidized to Fe
3+, hydraulic detention time is 0.5～1h;
5) the oxidation pond water outlet is pumped into the second order reaction pond, by adding sodium hydroxide pH is transferred to 9.3, add weight percentage simultaneously and be respectively polymerize aluminum chloride and the polyacrylamide of 1～1.5g/L and 0.2～0.5g/L, make under the stirring of stirrer that each metal ion reaction generates precipitation of hydroxide in the waste water;
6) water outlet of second order reaction pond is pumped into second-level settling pond, hydraulic detention time is 3～5h, and precipitating sludge pumps into sludge thickener;
7) the second-level settling pond water outlet is pumped into pH readjustment pond, by adding sulfuric acid pH is transferred to 6.5, hydraulic detention time is 1～1.5h;
8) pH is adjusted back the pond water outlet and pump into intermediate pool, hydraulic detention time is 1～1.5h;
9) the intermediate pool water outlet is pumped into sand filter, hydraulic detention time is 2～4h, and backwashing wastewater pumps into the equalizing tank circular treatment, but sand filter water outlet direct reuse;
10) mud in the sludge thickener dewaters through filter press, obtains water ratio and be 40～60% mud, and the mud outward transport is disposed, and mud supernatant liquor and filtrate pump into the equalizing tank circular treatment.
2. the method that a kind of medium and small town sewage according to claim 1 is handled, it is characterized in that: described first order reaction pond, one-level settling tank are used to remove F
-, oxidation pond, second order reaction pond and second-level settling pond are used to remove Cr
3+, Fe
3+, Ni
2+, and pH readjustment pond, intermediate pool and sand filter are used for the advanced treatment and the reuse of waste water.
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| CN108928953A (en) * | 2018-06-29 | 2018-12-04 | 中国科学院过程工程研究所 | A kind of method of stainless steel acid cleaning waste water recycling |
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Application publication date: 20110921 |