Pickling wastewater treatment project

During the production process, a large amount of acid washing wastewater was generated, which contained high concentrations of acidic substances and heavy metal ions. Traditional Wastewater treatment methods were unable to effectively remove these pollutants, and they also had problems such as high treatment costs and secondary pollution. In order to achieve efficient treatment and resource recovery of acid washing wastewater while meeting strict environmental protection requirements, the company introduced the MVR evaporation concentration process and selected 254SMO as the main material, ensuring the corrosion resistance and operational stability of the equipment. 254SMO is a super austenitic stainless steel with excellent corrosion resistance, especially suitable for treating high-acid and chloride-containing wastewater environments. 

 

Process Flow

• Pre-treatment: The acid-washed wastewater is first subjected to pre-treatment to remove suspended solids, large particles, and some heavy metal ions, and to adjust the pH value, ensuring the stability of the subsequent evaporation process. 

 

• MVR evaporation concentration: The pretreated wastewater is fed into the MVR evaporation system. 

 

• Heating evaporation: Through mechanical vapor re-compression technology, the secondary steam is compressed and heated to a higher temperature, which is then recycled as a heat source. The wastewater is heated and evaporated in the evaporator, and acidic substances and heavy metal ions gradually concentrate. 

 

• Secondary steam utilization: The secondary steam generated during the evaporation process is compressed by the compressor, its temperature and pressure are increased, and then it is reused as a heat source to achieve efficient energy conservation. 

 

• Concentrate liquid treatment: The concentration of acidic substances and heavy metal ions in the evaporated concentrate liquid has significantly increased. This can then be subjected to further advanced treatment or safely disposed of. 

 

• Condensate water reuse: The condensate water generated during the evaporation process is tested and, if it meets the reuse standards, is recycled back into the production process to achieve the recycling of water resources. 

 

Technical Advantages

• High Efficiency and Energy Saving: The MVR technology reduces energy consumption through the re-compression and recycling of secondary steam. Compared to the traditional single-effect evaporation process, it can achieve energy savings of up to 60% - 80%. 

 

• Strong corrosion resistance: The main body is made of 254SMO material, which has excellent corrosion resistance and can effectively resist the corrosion of acid-washed wastewater, thereby extending the service life of the equipment. 

 

• High degree of automation: Equipped with advanced automated control systems, it enables full-process automatic monitoring and operation, ensuring the stability and safety of the production process. 

 

• Significant environmental benefits: Through condensation and recovery of secondary steam, wastewater discharge is reduced, meeting environmental protection requirements. 

 

Application fields

 

 

The MVR evaporation concentration process is widely used in fields such as steel, chemical engineering, and environmental protection, and is particularly suitable for the treatment of acidic wastewater and the recovery of resources.