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Method and system for treating high-concentration phosphating wastewater

A treatment method and high-concentration technology are applied in the field of treatment methods and systems for high-concentration phosphating wastewater, which can solve the problems of not meeting actual use requirements, slow floc settling speed, and large floor space, and improve the dosing amount. Large, short residence time, the effect of accelerated precipitation

Active Publication Date: 2019-08-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, usually due to the problems of large dosage of flocculant and slow settling speed of flocs, it leads to large footprint, complex structure, difficult operation, poor use effect, and does not meet the actual use requirements.

Method used

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  • Method and system for treating high-concentration phosphating wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , a treatment system for high-concentration phosphating wastewater; including a water inlet pipe 1, a primary mixing pool 2, a secondary mixing pool 3, an air flotation pool 4 and an outlet pipe 5, the primary mixing pool 2, the secondary mixing pool 3 and the air flotation tank 4 are connected through the delivery pipeline 6 in turn, and the waste water is connected to the first-level mixing tank 2 from the water inlet pipe 1, and in the first-level mixing tank 2, it is forced to stir with the coagulant PAC and magnetic powder to form a first-level mixing tank system. The primary mixing system flows into the secondary mixing tank 3 through the delivery pipeline 6, and is forced to stir with the coagulant PAM in the secondary mixing tank 3 to form a secondary mixing system. The secondary mixing system flows into the air flotation tank 4 through the delivery pipeline 6, and the secondary mixing The system air flotation tank is separated into scum and effluen...

Embodiment 2

[0041] A treatment method for high-concentration phosphating wastewater,

[0042]The average COD of the sewage to be treated is 251.637 mg / L, the average total phosphorus concentration is 267.851 mg / L, and the average total nickel content is 14.332 mg / L. The sewage is treated according to the following steps:

[0043] (1) Adjust pH: The pH value of phosphating wastewater is stabilized in the neutral range of 6~7 through online real-time regulation;

[0044] (2) Level 1 mixing: the phosphating wastewater is pumped into the flocculation reaction tank through the lift pump, and 50mg / L PAC coagulant and 10mg / L magnetic powder are added, and stirred and mixed for 25 minutes to form a first-level mixing system;

[0045] (3) Two-level mixing: the first-level mixing system enters the coagulation aid reaction tank, and 20mg / L PAM coagulant aid is added, and the mixing reaction is stirred for 25 minutes to form a second-level mixing system;

[0046] (4) Air flotation separation: The se...

Embodiment 3

[0050] A treatment method for high-concentration phosphating wastewater,

[0051] The average COD of the sewage to be treated is 370.311 mg / L, the average total phosphorus concentration is 273.862 mg / L, and the average total nickel content is 16.663mg / L. The sewage is treated according to the following steps:

[0052] (1) Adjust pH: The pH value of phosphating wastewater is stabilized in the neutral range of 6~7 through online real-time regulation;

[0053] (2) Level 1 mixing: Phosphating wastewater is pumped into the flocculation reaction tank through a lift pump, 75mg / L PAC coagulant and 15mg / L magnetic powder are added, and the mixing reaction is stirred for 30 minutes to form a first-level mixing system;

[0054] (3) Two-stage mixing: and the mixed system enters the coagulation aid reaction tank, and 30mg / L PAM coagulant aid is added, and the mixing reaction is stirred for 30 minutes to form a two-stage mixing system;

[0055] (4) Air flotation separation: the secondary m...

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Abstract

The invention relates to the field of wastewater treatment, in particular to a method for treating high-concentration phosphating wastewater, and the method comprises the following steps: (1) adding coagulant PAC (polyaluminium chloride) and magnetic powder into the phosphating wastewater, stirring and mixing to obtain a first-level mixing system; (2) adding coagulant aid PAM (polyacrylamide) intothe first-level mixing system, stirring and mixing to obtain a secondary mixing system; (3) adopting an air floatation machine to carry out air floatation separation on the secondary mixing system toobtain effluent and scum, and by combining magnetic coagulation and air floatation technology, the method not only reduces the usage amount of medicaments, but also reduces the treatment time and occupied area, and improves the treatment efficiency.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method and system for high-concentration phosphating wastewater. Background technique [0002] The mechanical industry often uses phosphating treatment to form a protective layer for parts. The phosphating process refers to immersing the metal workpiece in a phosphate solution for chemical treatment, and using a solution containing phosphoric acid or phosphate to form an insoluble phosphate film on the metal surface. The process is the front process of the automobile painting process. In industrial production, in order to increase the corrosion resistance of the phosphating film and increase the adhesion between the paint and the metal substrate, Mn is usually added to the phosphating solution. 2+ 、Ni 2+ 、Cu 2+ Heavy metal ions or metal salts with a positive potential than iron (such as copper salts, nickel salts, etc.) can shorten the film forming time, reduce ...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/10C02F101/20
CPCC02F9/00C02F1/66C02F1/5236C02F1/56C02F1/488C02F2101/105C02F2101/20C02F2303/04C02F1/24
Inventor 徐璇付诗琪李奇谷晓松颜秋彤罗玉洁吕秀龙
Owner CHONGQING UNIV
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