Design of Sulfuric Acid Pickling Waste Solution Treatment
Abstract
The nickel industry is now a major consumer of sulfuric acid. The industrial scale production of sulfuric acid generates a large amount of spent pickling liquid. It is necessary to treat this kind of liquid before returning it to the environment. This paper gives a description of the design of the treatment plant for sulfuric acid pickling wastewater. The main treatment methods proposed include the adjustment of pH, the introduction of absorbents, the addition of precipitation flocculants and the microbial treatment.
Introduction
Nickel plate is mainly used in automobile, electronics, chemical and other industries. For industrial nickel plate, the surface of its parts must be treated before plating. It is usually treated by sulfuric acid pickling (pickling) to form holes containing nickel compounds, allowing subsequent plating of the part with various metals. The pickling process leads to the discharge of large quantities of acidic wastewater into the environment, which is an important source of pollutants. Sulfuric acid wastewater has a strong corrosive nature, contains high concentrations of certain ionic species and has an adverse effect on living organisms. In order to protect the environment and human health, it is necessary to treat and dispose of sulfuric acid waste liquid.
Technology Analysis
The sulfuric acid waste water pickling process generally includes flow adjustment, pH adjustment, adsorption and elimination, separation and microbiological control of pollutant components.
1. Flow adjustment: The removal of particles from the wastewater can be achieved by a variety of methods, such as centrifugation, flocculation sedimentation, and electrostatic separation.
2. pH Adjustment: The pH of the wastewater must be adjusted to the range of 5-7 before any precipitation or adsorption process can be effective. This can be achieved by adding sodium hydroxide, sodium carbonate or magnesium oxide to the wastewater.
3. Adsorption and Elimination: Adsorption on activated carbon is an effective way to remove heavy metals and toxic organic compounds from the wastewater. The adsorbed material can then be separated from the wastewater by filtration, sedimentation or centrifugation.
4. Separation: Solid-liquid separation of insoluble substances in the wastewater can be achieved by sedimentation, decantation or electrostatic precipitation.
5. Microbiological Control: Microbial systems such as Aerobic, Anaerobic and Biofilms can be used to control organic pollutants such as BOD, COD and other toxins.
Conclusion
Effective treatment of sulfuric acid pickling wastewater is necessary in order to protect living organisms and the environment. This article has discussed a design of treatment plant for sulfuric acid pickling wastewater that comprises of flow adjustment, pH adjustment, adsorption and elimination, and microbial control. This system can effectively treat the wastewater and reduce its environmental impact.
