During the experimental work in the laboratory, a large amount of chemical reagents are used, resulting in the production of a large amount of hazardous waste. Most of these waste materials exist in laboratory wastewater, which can cause great damage to the ecological environment. At present, laboratories have become an important source of environmental pollution, so it is necessary to strengthen the prevention and control of laboratory wastewater. What are the sources of laboratory wastewater? What are its characteristics? How to govern? Let's listen to Editor Eco's lecture

1、 Source of laboratory wastewater

1. Excess samples during the experimental process;

2. Residual liquid after sample analysis;

3. Washing solution, standard solution, etc.

2、 Types of laboratory wastewater

1. Wastewater containing acidic and alkaline substances. Common solutions such as hydrochloric acid, sulfuric acid, sodium hydroxide, etc., if discharged directly, can corrode drainage pipelines and affect groundwater quality. Once the acidity or alkalinity of the water body increases, it will weaken its self purification ability and cause biological variation in the water.

2. Wastewater containing metallic components. The heavy metal solutions used in the experiment, such as zinc, copper, silver, mercury, etc., are absorbed by aquatic organisms after discharge but cannot be decomposed in a timely manner. At this time, toxicity will occur, and the toxicity will spread from the water system to the entire ecosystem, threatening biological safety.

3. Wastewater containing organic solution. Taking petroleum ether and carbon tetrachloride as examples, the absorption of these organic solutions by the human body can damage central nervous system function, reduce immune function, and affect normal work and life.

3、 Characteristics of laboratory wastewater

1. Multiple types

The content of analyzing and monitoring environmental work includes hundreds of projects, including exhaust gas, soil, solid waste, wastewater, surface water, groundwater, microorganisms, etc., most of which use chemical analysis methods for experimental measurements. Due to the wide range of detection items and complex detection methods used, there are also many types of wastewater.

2. Insufficient quantity

In the actual implementation of environmental monitoring work, the frequency of experiments varies for different projects, especially for sporadic experimental projects. In this way, although there are many types of experimental wastewater, the amount formed is small. Once the staff neglect the corresponding handling, it may cause chemical reagent leakage, expired storage time, and ultimately lead to laboratory contamination.

3. Harmful

Environmental monitoring work itself has certain difficulties, reflected in the small amount of pollutants but serious harm. Taking water quality testing as an example, for COD content analysis of chlorine containing wastewater, a certain amount of mercury sulfate should be added to the sample to eliminate the influence of chloride ions. According to a water sample calculation, the pollution caused by 0.4g of mercury sulfate needs to be diluted with 5.4m3 of water to restore normal state. In grassroots environmental monitoring stations, the amount of mercury sulfate used each year is over 200g, in addition to pollutants such as sulfuric acid and silver sulfate. In the metal testing project, heavy metal pollution caused by liquid residue and sample residue is similar to the pollution caused by small electroplating plants.

4. Difficulty in governance

At present, there is a common situation in the management department where the experimental process is emphasized and the pollution treatment is light, which is manifested as a lack of attention to pollutant treatment, lack of technical guidance, and a lack of sound management norms. Although some laboratories have established regulations for equipment, reagents, and operation management, the pollution treatment measures are not perfect, and there is a phenomenon of residual liquid directly pouring into drainage pipes, which has become an important cause of environmental pollution.

4、 How to treat laboratory wastewater? Jiajie's laboratory wastewater treatment equipment adopts a wastewater treatment process of "collection pre precipitation device+acid-base neutralization regulation+air flotation precipitation+heavy metal capture+packed bed photocatalytic reaction+micro electrolysis reaction+catalytic oxidation reaction+active adsorption+MF microfiltration+MBR membrane treatment".

In wastewater treatment, in order to protect the pH value of the online control system, neutralization filtration technology is adopted to ensure that the acidic and alkaline wastewater can stably meet the standard. The automatic dosing system of reagents saves reagents. Multiple new wastewater treatment systems ensure safe operation of equipment and rapid treatment of wastewater.

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