In the automotive parts manufacturing industry, wastewater treatment is a crucial environmental treatment measure. This wastewater often contains harmful substances such as organic matter, heavy metals, waste oils and solvents, etc., and needs to go through a rigorous treatment process to ensure safe discharge or reuse.
Case of wastewater treatment in auto parts factory
An auto parts manufacturer in Guangdong: air flotation-anaerobic-aerobic process is used for treatment, and the water after some treatment standards is passed through sand filtration-carbon filtration-double membrane method (ultrafiltration + two-stage RO)-EDI process to meet the water quality requirements of ultrapure water. This case study shows that through advanced wastewater treatment technology, auto parts factories can effectively reduce their environmental impact while also improving the efficiency of resource utilization.
A large auto parts factory in Guangdong: A set of wastewater treatment facilities including oil-water separation, flocculation and sedimentation, biological treatment and advanced oxidation process has been established. Through this system, the pollutants such as heavy metals, organic matter, grease and suspended solids in the wastewater have been successfully reduced below the standard, and at the same time, the wastewater has been recycled and the dependence on fresh water has been reduced.
Primary treatment
Goal: To remove suspended solids and particulate matter from wastewater.
1. Sedimentation: By allowing the heavier solid particles to settle naturally to the bottom, a precipitate is formed.
2. Filtration: Different types of filter media, such as sand, activated carbon, etc., are used to intercept suspended solids in wastewater.
3. Solid-liquid separation: Centrifuge or other mechanical methods are used to separate solids and liquids in wastewater for subsequent treatment.
Chemical assistance: During the sedimentation process, flocculants may need to be added to help the suspended solids aggregate into larger particles for easy sedimentation and filtration.
Biochemical treatment (secondary treatment)
Objective: To degrade biodegradable organic matter in wastewater.
1. Aerobic treatment: In an aerobic environment, aerobic microorganisms are used to convert organic matter into carbon dioxide and water.
2. Anaerobic treatment: In an anaerobic environment, anaerobic microorganisms convert organic matter into methane and carbon dioxide.
Microbial action: Biochemical treatment relies on the metabolic activity of microorganisms to convert organic pollutants into harmless substances.
Advanced treatment goal: to further remove refractory organic matter and heavy metals.
1. Activated carbon adsorption: Use the adsorption capacity of activated carbon to remove dissolved organic matter and certain heavy metals.
2. Chemical oxidation: chemical oxidants such as chlorine, ozone, etc., are used to oxidize refractory organic matter into small molecule substances that are easy to handle.
3. Advanced Oxidation Processes (AOPs): A combination of strong oxidizing agents and appropriate reaction conditions, such as ultraviolet light and hydrogen peroxide, is used to generate hydroxyl radicals for efficient degradation of organic matter.
Final knot processing
Goal: Ensure that wastewater meets discharge standards or meets reuse requirements.
1. pH adjustment: Adjust the pH value of the wastewater to neutral to reduce the impact on the environment.
2. Disinfection: Use chlorine, ozone or ultraviolet light to kill pathogenic microorganisms in wastewater to ensure water quality safety.
3. Other necessary treatments: Depending on the characteristics of the wastewater and the discharge standards, other special treatments may be required.
Local regulations: When treating wastewater, local environmental regulations and discharge standards need to be strictly adhered to.
Discharge standards: Different countries and regions may have different wastewater discharge limits, and the wastewater treatment technology selected should ensure that these standards are met.
Through this detailed set of wastewater treatment steps, automotive parts manufacturers can ensure that the wastewater generated during their production processes is effectively purified, protecting both the environment and human health. At the same time, the treated wastewater can also be considered for recycling and reuse according to its water quality, so as to achieve sustainable use of resources.