Acidic Wastewater Treatment and Resource Recovery - Recommended Core Technology

Characteristics and difficulty of acidic wastewater

Acidic wastewater mainly comes from the production processes of mining, metal surface treatment, electroplating, chemical plants and other industries. During these processes, acidic substances such as sulfates and heavy metal ions will be formed due to oxidation, acidification and other reactions. The characteristics of acidic wastewater include high coke content, high oil content and small oil droplet size, severe emulsification, high sulfur, ammonia nitrogen and phenol content, poor biodegradability, complex composition and large fluctuations in content.

Process flow of acidic wastewater treatment resource recovery

The treatment process of acidic wastewater usually includes pretreatment, main treatment, deep treatment and sludge treatment. The pretreatment stage may include adjusting water quality, removing large particles of impurities, etc.; the main treatment stage uses the various treatment methods mentioned above to remove acidic substances and heavy metal ions; the deep treatment stage may include further removal of residual pollutants and disinfection; finally, the sludge treatment stage is to stabilize, reduce and harmlessly treat the sludge generated during the treatment process.

Core technology for acidic wastewater treatment resource recovery

The titanium dioxide acidic wastewater treatment and resource recovery technology of Shangchen Environment is a comprehensive treatment, purification and reuse technology for waste acid from China's sulfuric acid process titanium dioxide production. After being treated by the entire process system, the waste acid can be purified and concentrated to a clean acid concentration of 20%-80% for reuse, and the titanium dioxide particles and metals in the original acidic wastewater can be extracted and recovered, so that the original "wasted resources" can be reused in production and the generation of hazardous waste titanium gypsum can be significantly controlled.

The process ideas of Shangchen Environment can also be used in waste acid purification and recovery projects in other related industries. This technology has been successfully applied to the acid wastewater recycling project of Panzhihua Dahutong Titanium Co., Ltd., the acid wastewater purification and treatment environmental protection project of Shandong Doguide Group, as well as the waste hydrochloric acid and waste brine treatment and resource recovery project of Pangang Group Company Limited.

[Shangchen Environment - Engineering Application Cases]

[Titanium Dioxide Project of Panzhihua Dahutong Titanium Co., Ltd.]

Panzhihua Dahutong Titanium Co., Ltd. produces 38,000 tons of titanium dioxide annually, 2.03 million tons of acidic wastewater and 200,000 tons of waste acid each year. After the acidic wastewater of this project is treated by the purification and concentration system, the titanium dioxide in it can be concentrated to a concentration of 30g/L for recycling. The metal components mainly composed of iron salts can be concentrated and converted into high-value flocculants. The clean acid is concentrated to 65% as a production raw material.

Treatment capacity: primary wastewater 6500 m³/d, secondary wastewater 6150 m³/d

Treatment effect: Achieve full reuse of multi-component resources in wastewater and zero wastewater discharge