CN101100339A

CN101100339A - Process for reclaiming and treating phosphorization sewage

Info

Publication number: CN101100339A
Application number: CNA2007100703628A
Authority: CN
Inventors: 胡建平; 李强
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-26
Filing date: 2007-07-26
Publication date: 2008-01-09

Abstract

This invention discloses a method for treatment and recovering of waste-water from bonderizing process. The method comprises procedures of: (1), waste-water from oil-removing washing of bonderizing process of from bonderizing process washing step is fed into neutralization tank (IV), adding alkali or acid to regulate its pH value of 7-9; then (2), it is fed into reaction tank (V), adding flocculating agent, and agitating, controlling the oil<=1.0mg; total phosphorous<=1.0mg, Zinc<=3.2mg; (3), it is then fed into settling tank (VI), controlling its suspension solid<=0.7mg; (4), after settling, the water is fed into clarification tank (VII), and stored for cyclic utilization. The advantages of this invention are: low cost, reducing water consumption and reducing water pollution.

Description

Process for reclaiming and treating phosphorization sewage

Technical field

The present invention relates to a kind of phosphating process sewage water treatment method, the method that particularly a kind of phosphating process sewage is recycled.

Background technology

It is one of important procedure of antitheft door that phosphating process is handled, its objective is improve the steel plate corrosion resistance and and adhesive force of coatings; Existing phosphating process is handled and is comprised oil removing; clean; pickling; clean; table is transferred; phosphatization; clean; operations such as passivation; in the bonderizing process, there is a large amount of sewage to produce; in order to preserve the ecological environment; avoid sewage directly to enter the Nature and produce environmental pollution; the phosphating process sewage water treatment method as shown in Figure 1 at present; oil removing is cleaned; pickling is cleaned; the sewage that the phosphatization cleaning produces focuses on neutralization tank adding alkali or acid neutralizes; pH value is controlled at 7～8; enter reaction tank after the neutralization and add coagulating agent (polymerize aluminum chloride 3.0～10mg/L; polyacrylamide 1.0～5.0mg/L) also stirs; enter the settling tank clarification after the reaction, the clear water discharging.According to above-mentioned treatment process, the emission request that total phosphorus is difficult to be up to state standards, in order to make the total phosphorus qualified discharge, some producer has to carry out second-stage treatment, tertiary treatment, even carry out biological phosphate-eliminating, this has not only increased technical process, operation easier, and has increased running cost greatly, and water resource waste is serious.For this reason, many manufacturers and knowledgeable people have carried out research repeatedly, but do not have ideal method to solve the problems referred to above so far as yet.

Summary of the invention

For overcoming the above-mentioned disadvantage that existing phosphating process sewage disposal exists, the purpose of this invention is to provide the process for reclaiming and treating phosphorization sewage of a kind of advantages of simple technological process, easy to operate, recycle, realization zero release.

The technical solution adopted for the present invention to solve the technical problems comprises the steps:

1), clean that the sewage that produces adds alkali in neutralization tank or acid neutralizes in the phosphating process in oil removing cleaning and the phosphatization matting, pH value is controlled at 7～9;

2), the treating water after the neutralization enters reaction tank, adds coagulating agent and also stirs, oils is controlled at≤1.0mg, total phosphorus is controlled at≤1.0mg, zinc is controlled at≤3.2mg;

3), reacted treating water enters settling tank precipitation, suspended solids is controlled at≤0.7mg.

4), the treating water of post precipitation enters clean water basin and deposits, reuse when oil removing cleaning and phosphatization matting need be replenished.

1), clean the sewage that produces in the phosphating process in the pickling process and add unslaked lime at neutralization tank and neutralize it is further comprising the steps of:, pH value is controlled at 6.6～7, and iron ion is controlled at≤5.0mg;

2), the treating water after the neutralization enters the settling tank precipitation;

3), the treating water of post precipitation enters clean water basin and deposits reuse when the pickling process cleaning needs to replenish.

Described coagulating agent is polyphosphate iron chloride and polymerize aluminum chloride, and add-on is respectively 3～8.0mg/L.

Stirred fast earlier 1～2 minute during stirring, stirred at a slow speed then 15～30 minutes.

Described alkali is sheet alkali, and acid is sulfuric acid.

The present invention is directed to present phosphating process sewage disposal can not qualified discharge or qualified discharge instability and the high shortcoming of processing cost new approaches have been proposed, after adopting technique scheme, following advantage is arranged: the one, clean the sewage that produces in sewage that cleaning produces in oil removing cleaning and the phosphatization matting in the phosphating process and the phosphating process in the pickling process and handle respectively, not only reduce intractability, and can reduce processing cost; The 2nd, reuse after the sewage disposal that cleaning produces in oil removing cleaning and the phosphatization matting in the phosphating process, reuse after the sewage disposal that cleaning produces in the pickling process in the phosphating process, effective ingredient in the waste liquid not only can be fully used, and under the prerequisite that does not influence the phosphatization quality, recycle after the sewage disposal, reduce intractability, realize zero release, solved present sewage discharge problem not up to standard; The 3rd, the entire sewage processing technological flow is simple, easy to operate.

Description of drawings

Fig. 1 is the schema of present phosphating process sewage disposal.

Fig. 2 is phosphating process sewage recycling schema of the present invention.

Embodiment

Shown in Figure 2, be the specific embodiments of process for reclaiming and treating phosphorization sewage of the present invention, it comprises the steps:

1), clean that the sewage that produces adds sheet alkali in neutralization tank 4 or sulfuric acid neutralizes in the phosphating process in oil removing cleaning and the phosphatization matting, make the sewage PH value in the neutralization tank 4 be controlled at 7～9;

2), the treating water after the neutralization enters reaction tank 5, add coagulating agent such as polymer phosphate, iron(ic) chloride and polymerize aluminum chloride, add-on is respectively 3～8.0mg/L, and stirred fast 1～2 minute, coagulating agent is evenly distributed, stirred at a slow speed then 15～30 minutes, help cohesion, treating water oils in the reaction tank 5 is controlled at≤1.0mg, and total phosphorus is controlled at≤1.0mg, and zinc is controlled at≤3.2mg;

3), reacted treating water enters settling tank 6 precipitation, suspended solids is controlled at≤0.7mg.

4), the treating water of post precipitation enters clean water basin 7 and deposits, reuse when oil removing cleaning and phosphatization matting need be replenished, though can not qualified discharge, reuse does not influence the quality of oil removing and phosphatization, treating water can recycle.

1), clean the sewage that produces in the phosphating process in the pickling process and add unslaked lime at neutralization tank 1 and neutralize it is further comprising the steps of:, pH value is controlled at 6.6～7, and iron ion is controlled at≤5.0mg;

2), the treating water after the neutralization enters settling tank 2 precipitations;

3), the treating water of post precipitation enters clean water basin 3 and deposits, when pickling process cleans reuse when needing to replenish, though can not qualified discharge, getting back in the pickling matting does not influence the quality of cleaning, treating water can recycle.

In sum, the sewage that cleans generation in the pickling process in the sewage that clean to produce in oil removing cleaning in the phosphating process and the phosphatization matting and the phosphating process is handled respectively, though can not qualified discharge, can recycle; This not only can reduce water resources waste, reduce production costs, therefore also avoided discharging a series of problems that environmental pollution up to standard did not bring.

Claims

1, a kind of process for reclaiming and treating phosphorization sewage comprises the steps:

1), clean that the sewage that produces adds alkali in neutralization tank (4) or acid neutralizes in the phosphating process in oil removing cleaning and the phosphatization matting, pH value is controlled at 7～9;

2), the treating water after the neutralization enters reaction tank (5), adds coagulating agent and also stirs, oils is controlled at≤1.0mg, total phosphorus is controlled at≤1.0mg, zinc is controlled at≤3.2mg;

3), reacted treating water enters settling tank (6) precipitation, suspended solids is controlled at≤0.7mg;

4), the treating water of post precipitation enters clean water basin (7) and deposits, reuse when oil removing cleaning and phosphatization matting need be replenished.

2, process for reclaiming and treating phosphorization sewage according to claim 1,1), clean the sewage that produces in the phosphating process in the pickling process and add unslaked lime at neutralization tank (1) and neutralize it is characterized in that: it may further comprise the steps:, pH value is controlled at 6.6～7, and iron ion is controlled at≤5.0mg;

2), the treating water after the neutralization enters settling tank (2) precipitation;

3), the treating water of post precipitation enters clean water basin (3) and deposits reuse when the pickling process cleaning needs to replenish.

3, process for reclaiming and treating phosphorization sewage according to claim 1 is characterized in that: described coagulating agent is polyphosphate iron chloride and polymerize aluminum chloride, and add-on is respectively 3～8.0mg/L.

4, process for reclaiming and treating phosphorization sewage according to claim 1 is characterized in that: stirred fast earlier 1～2 minute during stirring, stirred at a slow speed then 15～30 minutes.

5, process for reclaiming and treating phosphorization sewage according to claim 1 is characterized in that: described alkali is sheet alkali, and acid is sulfuric acid.