Laboratory wastewater treatment

The treatment and management of wastewater from laboratory facilities are causing many difficulties for the authorities. Usually, wastewater from experimental activities is discharged directly into sewers or public sewer lines, creating difficulties in resource control and management. Therefore, installing a laboratory wastewater treatment system is a significant and necessary factor.

What is laboratory wastewater?

Laboratory wastewater includes wastewater from experimental activities. Domestic Wastewater of employees, Wastewater from living and cooking areas,…

Laboratory wastewater contains many pathogens, such as bacteria and microorganisms containing diverse pathogens.

• Solids such as ammonium acetate, ammonium dihydro phosphate, ammonium molybdate, ammonium chloride, arsenic, ascorbic acid, barbituric acid, benzoic acid, boric acid, Chromo tropic acid, citric acid, and many other solids.
• Liquids include benzene, ethanol, formaldehyde, n-hexane, o-xylene, and others.
• Standards, dyes, and other compounds are used during the experiment.

In addition, laboratory wastewater may also contain antibiotic radicals such as amoxicillin, ampicillin, b-lactam, and other antibiotics.

Laboratory wastewater has the characteristics of easily polluting the environment, especially toxic chemicals used in the experiment process. Long-term exposure to wastewater can be harmful to human health and the environment.

To solve this problem, laboratory wastewater treatment in hospitals, clinics, and schools requires collection and preliminary treatment before being discharged into the environment. This treatment helps prevent the release of hazardous chemicals and reduces potential risks to people and the environment.

Laboratory wastewater treatment process

Collection pit: To collect wastewater from different sources. It also removes large garbage; the pit must be installed with a screen.

Laboratory wastewater is sent to a conditioning tank for treatment. Here, a continuous air supply system is used to regulate the concentration and flow of wastewater. This is necessary because wastewater’s acidic or basic concentrations are often different. Concentration regulation is extremely important.

Ozone method is used to treat wastewater. This process involves the oxidation of Ozone (O3) with the help of H2O2 (called Perozone). When oxidation occurs, OH- radicals are generated, which are strong reducing agents and have the ability to remove organic substances such as BOD5, COD (up to 90%), TSS, and Coliform (up to 95%) from wastewater. In this process, Ozonation combines with OH- radicals to increase the ability to effectively remove organic substances in wastewater. The use of H2O2 and Ozone only takes place at a high level when they directly affect each other. Some of the catalysts involved in the ozonation process include OH-, Fe2+ and Al3+.

Coagulation – Flocculation: Wastewater passes through flocculation – flocculation tank, in which PAC (Poly Aluminum Chloride) chemicals are added to bind the residue and form larger-sized floc particles. This process separates the residue.

An anoxic biological treatment tank is where wastewater is treated by natural methods, in which anaerobic microorganisms (VSV) work in an oxygen-free environment to decompose and absorb compounds. Organic matter and other minerals as food and nutrients. To enhance the efficiency of the process, the wastewater is passed through the aeration tank and continuously supplied with oxygen by the blower, helping the aerobic microorganisms to grow and create new biomass.

The aerobic biological treatment tank has an MBR biological filter with an extremely small filter hole to remove organic matter and pollutant waste. On the surface of the filter media, aerobic bacteria VSV immobilize and process complex pollutants into simple inorganic substances. Sludge is reused to keep the concentration of VSV bacteria in the tank, while a part is put into the sludge tank for periodic treatment.

The disinfection tank is used to treat water by passing clean water through the filtration system and into the disinfection tank. To destroy bacteria and disease-causing organisms that cannot be eliminated in the previous stage, we add disinfectant chemicals such as Chlorin or NaOCl to the water. After this treatment process, the produced wastewater must meet the National Technical Regulation QCVN 28:2010/BTNMT standards.

Notes when building a laboratory wastewater treatment system

The construction process requires detailed calculations and an optimized design of each work stage to ensure the efficient operation of the laboratory exhaust gas treatment system. Attention should be paid to the following issues:

• Structure and materials: The design must be suitable with the structure of the work and use structural materials to ensure the technical properties according to the requirements proposed on the design drawings.
• Safety: It is necessary to ensure that the wastewater treatment system is designed to meet the requirements of fire prevention and escape routes.
• Structure and foundation: Calculating and designing the structure and foundation of the water system and the stormwater and wastewater treatment works must minimize uneven settlement and have a floating design solution. Processing works.
• Area optimization: The items in the wastewater treatment plant should be combined into a typical building that is easy to manage and reduce the ground area.

Cost of laboratory wastewater treatment

• Wastewater composition and properties: The cost depends on the design and nature of the wastewater, including the concentration of pollutants present in the water.
• Wastewater composition and properties: The cost depends on the design and nature of the wastewater, including the concentration of pollutants present in the water.
• Treatment technology: The choice and application of wastewater treatment technology also significantly affects costs. Treatment technologies may vary depending on specific requirements and conditions.
• Treatment standard: The cost also depends on the achieved level of the wastewater standard after treatment, which can be column A or column B standard.

In addition, there are many other factors that depend on the actual conditions of each specific location. To ensure customer satisfaction and peace of mind, Hop Nhat is committed to bringing top quality, dedicated support services, and the best laboratory wastewater treatment efficiency today.