How to deal with the acidic wastewater from acid salt spray testing of metal electronic products and devices?

UUC

How to deal with the acidic wastewater from acid salt spray testing of metal electronic products and devices? [Copy link]

 

I have encountered a problem and need help from my peers or friends who have a solution:

I am planning to purchase an acid salt spray test chamber. How should I deal with the acid wastewater from the acid salt spray test of metal electronic products and devices? The current method is to regularly collect the acid wastewater and neutralize it with an alkaline reagent before discharging it. The acid reagent used in the test is acetic acid (glacial acetic acid), and the test pH value is about 3.0; the company's wastewater discharge standard is a pH value of 6-9. At present, because the equipment has not arrived yet, the estimated salt spray deposition (i.e., fog production) according to the test requirements is (120-240) ml/hour. There are currently many uncertain factors about the pH of the final wastewater, and the amount and concentration of the alkaline reagent are a bit difficult to estimate. If you have a better way, or know about the wastewater treatment method tested by a third party, please let me know. Thank you!

chunyang

The test chamber does not produce much wastewater. Alkaline substances such as sodium carbonate and sodium hydroxide can be added to neutralize acetic acid. The pH value can be measured with a pH meter. The finished pH meter is similar to a multimeter and is not expensive. It can be measured with a conventional original inert electrode. When adding alkali, prepare a solution and add it. When using carbonate, pay attention to the generation of gas. It needs to be connected to the pH meter and added slowly and stirred.

Theoretically, it is possible without using a pH meter. The amount of alkali that needs to be added can be calculated based on the concentration and amount of the acidic waste liquid. This can be done by reviewing the calculation of molar amounts in high school chemistry. The final pH value can be tested with pH test paper, which is the lowest cost method.

chunyang

When I moved a few years ago, I planned to give away my entire set of chemical laboratory equipment and reagents, including a large number of relatively expensive chemical reagents, as well as the automatic titrator/PH regulator I made in college, several electrodes, etc., but no one wanted them...

UUC

chunyang posted on 2020-6-8 11:10 When I moved a few years ago, I planned to give away my entire set of chemical laboratory equipment and reagents, including a large number of relatively expensive chemical reagents, and the automatic drip machine I made in college...

UUC

chunyang published on 2020-6-8 11:05 The test chamber does not produce much wastewater. Alkaline substances such as sodium carbonate and sodium hydroxide can be added to neutralize acetic acid. The pH value can be measured with a pH meter. The finished pH meter is similar to a multimeter...

Yes, I plan to do so. But now the company's security director asked me these questions, and I find it difficult to answer:

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The wastewater discharge standard is a pH range of 6-9 . What is the pH value of wastewater containing glacial acetic acid ? What is the concentrated discharge volume at one time?

When the main consideration is the maximum concentrated discharge, will the total discharge outlet exceed the standard?

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The equipment manufacturers have no data on the above issues, so we can only estimate them through tests when the equipment is debugged.

chunyang

There is no way to tell what the pH value of untreated wastewater is. The most direct way is to measure it. Of course, if you know the concentration of acetic acid, you can also calculate it. You can also check the high school chemistry textbook, but it is required that it does not contain other substances that affect the pH value. As for the centralized discharge volume, this is related to the generation and storage capacity of waste liquid, which is the final consideration and decision of your company. Whether the discharge exceeds the standard depends on the amount, the pH value of other wastewater, whether the wastewater is treated and how it is treated. What you have to do is to prevent excessive discharge, so you have to figure out the relevant knowledge and technical details.

UUC

chunyang posted on 2020-6-8 12:29 It is impossible to tell what the pH value of untreated wastewater is. The most direct way is to measure it. Of course, if you know the concentration of acetic acid, you can also calculate it. Similarly, check the high...

OK, thanks

qwqwqw2088

It is not a high concentration of acid and alkali wastewater. The general method is to neutralize the wastewater treatment.

Discharge needs to be applied to the local environmental protection department

UUC

qwqwqw2088 posted on 2020-6-8 14:06 It is not a high-concentration acid-base wastewater. The general method is to neutralize the wastewater treatment and discharge. It is necessary to apply to the local environmental protection department.

Yes, it needs to reach the corresponding acid-base range to discharge

okhxyyo

Has the landlord's problem been solved?

UUC

okhxyyo posted on 2020-6-9 09:23 Has the original poster's problem been solved?

Not yet, the equipment has not arrived yet. It is just a plan at the moment. When the equipment arrives, we will solve it according to the actual situation. What good solutions does Guan Guan have?

okhxyyo

UUC posted on 2020-6-9 13:01 Not yet, the equipment has not arrived yet. It is just a plan at the moment. When the equipment arrives, we will solve it according to the actual situation. What good solutions does the management have?

Teacher Chunyang’s suggestion is very good.

UUC

okhxyyo posted on 2020-6-9 14:52 Teacher Chunyang’s suggestion is good.

OK