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Green Treatment Of Waste Liquid In Testing Laboratory
来源: | Author:AUWII | time :2020-12-15 | 103 Browse: | 分享到:
In recent years, with the continuous growth of environmental protection, the general public's awareness of environmental protection has also been continuously strengthened. This is also the main reason for the continuous growth of environmental testing agencies. When environmental testing is carried out in the laboratory, as the number of experiments continues to increase, the amount of waste liquid also begins to grow, and the cost becomes more and more complicated. However, the country currently lacks a unified management of laboratory waste liquid. Therefore, laboratory waste liquid cannot be effectively treated, which has caused certain harm to the environment and human health. Today, I will explain to you the testing of laboratory waste liquid. Green issues

In recent years, with the continuous growth of environmental protection, the general public's awareness of environmental protection has also been continuously strengthened. This is also the main reason for the continuous growth of environmental testing agencies. When environmental testing is carried out in the laboratory, as the number of experiments continues to increase, the amount of waste liquid also begins to grow, and the cost becomes more and more complicated. However, the country currently lacks a unified management of laboratory waste liquid. Therefore, laboratory waste liquid cannot be effectively treated, which has caused certain harm to the environment and human health. Today, I will explain to you the testing of laboratory waste liquid. Green issues

Analysis of the status quo of waste liquid in environmental testing laboratories


(1) Source and Type Analysis of Laboratory Waste Liquid

 

Generally, laboratory waste liquid can be divided into two categories: inorganic and organic. Because the cost of waste liquid is more complicated, this is also a main reason for the difficulty of waste liquid management in environmental testing.

 

The main sources of laboratory waste liquid include: The first is the remaining water samples generated after the analysis during the experiment in the laboratory. For example, in the analysis of surface water and sewage, the amount of sewage or surface water generally collected is much larger than the actual amount required for the test, the remaining water sample generated after the analysis of the experimental data, or the degree of pollution in the experiment is relatively low The water sample is usually discharged directly through the sewer.

 

Green treatment of waste liquid in testing laboratory

 

The second is that when testing in the laboratory, the actual processing of some samples and a series of chemical reactions during the analysis of water samples will produce laboratory waste liquid. These waste liquid phases are for the first type of laboratory waste liquid. The pollution level is relatively large.

 

The third type is that in the analysis of the waste liquid production environment, a certain amount of waste liquid will be generated in the specific analysis method, and this kind of analysis liquid will generally have a certain degree of harm.


(2) Analysis of the status quo of laboratory waste liquid treatment

 

At present, in some relatively large companies, there are relatively few waste liquid treatment technologies, and the waste liquid treatment process is expensive. In addition, due to the limitation of the experimental scale in the laboratory, the amount of waste liquid produced is generally relatively small, and the experimental cost of this waste liquid is also very complicated. In this case, many laboratories do not discharge the waste liquid. Pay attention, this will have a certain impact on the environmental protection of the laboratory. At present, although there are some regulations and management regulations for waste liquid treatment in some laboratories, there is a lack of corresponding laws and regulations at the national legal level. Therefore, the rules and regulations in the laboratory may be irregular, and these rules and regulations are often not implemented in the actual implementation process. The emergence of this phenomenon will also have a very bad effect on the treatment of waste liquid in the laboratory.


Analysis of problems existing in the treatment of waste liquid in environmental testing laboratories


(1) The concept of environmental protection is relatively backward

 

At present, with the continuous updating of people's environmental protection concepts, environmental protection work has achieved certain results, but in the treatment of laboratory waste liquid, there is a lack of scientific waste liquid treatment systems. This has caused many laboratories to be in a passive state when performing related operations. If the environmental protection awareness and sense of responsibility of the staff in the laboratory cannot meet the standard, then the laboratory waste liquid treatment lacks relevant institutional memory constraints, which will cause the arbitrary discharge of laboratory waste liquid.


(2) Incomplete laboratory waste liquid discharge equipment

 

In the process of discharging laboratory waste liquid, many supporting experimental equipment are not perfect. In addition, because many laboratories have been built for too long, the laboratory did not consider the environmental pollution caused by waste liquid discharge in the initial stage of construction. Therefore, there is a lack of a series of professional discharge equipment to discharge related waste liquid. In some newly-built laboratories, although waste liquid collection barrels are designed, they are actually too heavy to be collected in accordance with relevant standards. Sometimes the collection barrels are placed in the corridors of the laboratory. If the above-mentioned various phenomena cannot be solved in time, it will be more difficult to collect laboratory waste liquid. In addition, the laboratory’s drainage pipeline does not distinguish between underground waterways and domestic sewage discharge pipelines. In this way, some alkaline or acid-containing waste liquids will be directly discharged into the lake water. The discharge of this waste liquid is harmful to the local environment and ecology. The system caused serious damage.


(3) There are fewer companies dealing with laboratory waste liquid

 

At present, there is a lack of professional water treatment institutions in the treatment of laboratory waste liquid. Moreover, in the treatment of laboratory waste liquid, some companies cannot carry out scientific treatment. This type of professional enterprise needs the supervision and management of some professional departments and environmental testing departments. However, there are not few such enterprises at this stage, and some only enterprises also deal with incomplete types for various reasons. The waste liquid that may be generated requires a combination of several laboratories to complete.


Green treatment of waste liquid in the laboratory


 (1) Classification and collection of waste liquid

 

The most important prerequisite for waste liquid treatment is the sorting and collection of waste liquid. However, because the amount of waste liquid in the laboratory varies according to the experiment and the time of discharge, the waste liquid storage container is generally used for current treatment of the waste liquid, and then collected together for regular centralized treatment. According to the different types and classification standards of laboratory waste liquids, the collection liquid can be divided into different types, so that when collecting, it can be collected in different dissolved gases according to the type of waste liquid. The biggest advantage of this is that it can Prevent chemical reactions of various solutions together, leading to accidents.


(2) Waste liquid storage management

 

In the storage of waste liquid, it is necessary to ensure that the waste liquid can be stored in a fixed location and ensure its ventilation. In this way, the storage of waste liquid can ensure that it is not damaged by natural external forces, wind and rain, etc., and effective corresponding markings should be maintained on the fire, and the names of various collection tanks and the types of waste liquid collected and other information should be clearly indicated. In the management of waste liquid, a special person must be arranged to take care of it, and to register and deal with it to ensure that the storage tank can be managed regularly. In addition, ensure that the storage volume of waste liquid cannot exceed 70% to 80% of the container during storage. During storage, if the storage volume of the waste liquid exceeds the limited dissolved gas, it must be treated in time to avoid accidents.

 

(3) Green treatment method of waste liquid

 

When the waste liquid is processed in the laboratory, it must be handled by itself or transferred according to the actual situation of the laboratory. The so-called self-disposal is based on some conditions of the laboratory itself, to carry out related harmless treatment of some toxic waste liquids within its own ability, and the transfer treatment is for some that cannot be processed due to some limitations of the laboratory itself. Transfer the waste liquid to other companies with professional qualifications for related treatment.


The method of self-processing laboratory waste liquid

 

Treating the waste liquid in the laboratory under its own conditions is currently the most commonly used method for waste liquid treatment. It is also the fastest and most direct method of all waste liquid treatment, which consumes the least time and money, and is also a way to reduce environmental pollution. A green way. The laboratory's own processing methods mainly include the following:

 

(1) Laboratory waste liquid containing acid and alkali

 

For the laboratory waste liquid containing acid or alkali, middle and post-treatment are generally carried out according to the principle of acid and alkali. In the process of processing, attention should be paid to the operation in a small number of times. When stirring, the two waste liquids with different pH values are merged. Generally, the pH value of the solution can be adjusted to 7 for corresponding discharge.


(2) Treatment of cyanide-containing waste liquid in laboratory

 

The cyanide-containing waste liquid produced in the laboratory is generally detoxified by using a strong oxidant, and then sodium hydroxide is added to adjust the pH value. Generally, when the PH value is above 10 during this process, 4% potassium permanganate can be used to decompose it. However, if the value of cyanide in the laboratory waste liquid is too high, the processing steps must be adjusted. The PH value of the waste liquid can be adjusted to above 10, and then sodium chloride is added on this basis, so that the toxic cyanide can be decomposed into non-toxic carbon dioxide and nitrogen in the chemical reaction, and after a period of time There will be no emissions of cyanide.


(3) Treatment of sulfur-containing waste liquid in laboratory

 

The sulfur-containing waste liquid in the laboratory will generally adjust its PH value to 8-9 by adjusting, and then add ferrous sulfate and lime, so that the waste liquid can be adjusted to the precipitation of ferrous sulfide. In this way, the treated waste liquid can be discharged after being fully diluted.


(4) Treatment of mercury-containing waste liquid in laboratory

 

Now adjust the PH value of this waste liquid to 8-10, and then add some ferrous sulfite for chemical reaction. After separation and precipitation, the waste liquid can be discharged without mercury anymore, and the precipitation containing mercury can be discharged again. Transfer for processing.


The treatment of lead-containing waste liquid in the laboratory

 

Generally, the method of adding slaked lime to the waste liquid is used to increase its PH value above 11. During this process, the lead in the waste liquid will generate lead hydroxide precipitates, and then add aluminum sulfate. At this time, the pH value is It will drop to 7-8, and lead hydroxide and aluminum hydroxide are separated and discharged after precipitation.


Environmental testing, as a technical support for environmental protection work, should pay more attention to environmental protection in daily laboratory operations and waste liquid treatment. This requires laboratories in the waste liquid treatment and waste liquid management, in line with the principle of green treatment, relying on green chemistry, to establish and improve various waste liquid management systems as soon as possible to achieve reasonable treatment Laboratory waste liquid provides support for the green treatment of waste liquid in environmental testing laboratories.