Chuanjinxiang’s “*ao acid an wastewater reverse osmosis membrane infiltration integration technology”: effectively increases the recovery rate

Thread Content

Chuanjinxiang’s “Reverse Osmosis Membrane and Filtration Integration Technology for *ao Acid wastewater”: Effective in increasing recovery rates. Author/Source: Chuanjinxiang. Date: 2022-04-29. Clicks: 16. Sichuan Jinxiang Sairui Chemical Co., Ltd. invested 12 million yuan to carry out advanced technical upgrades to the *ao acid wastewater recovery system. Upgraded from the traditional ion exchange resin process to an integrated reverse osmosis membrane filtration process, this technology was successfully applied for the first time in China for the treatment of phosgene wastewater, and thus received recommendation from the Nitrogen Fertilizer Industry Association for the First Prize in Science and Technology Awards ； Invention patent number: 2012105826292. “*The innovative application of the \"integrated reverse osmosis membrane infiltration technology for AO acid and AN wastewater\" is a recovery system that concentrates AO acid and AN wastewater with a quality concentration of 0.5% into a concentrated solution with a concentration of 10%, while simultaneously producing fresh water with a conductivity of less than 30 μs/cm for use in production. This technology is the “*ao acid an wastewater reverse osmosis membrane infiltration integration technology,” which can effectively improve treatment efficiency and recovery rates; it enables the recovery of **2,000 tons per year, as well as 300,000 cubic meters of partially desalinated water per year. Chuanjin Xiang (including its affiliates and subsidiaries) ranks first in the world in terms of the production and sales volume of melamine. Its products have been recognized by the Ministry of Industry and Information Technology as \"Champions of Manufacturing\", and its technology leads the industry on a global scale ； Sales volume of nitro compound fertilizers ranks first in the country. The company is a **high-tech enterprise**, a **\"Green Factory\"**, and a model enterprise for scientific and technological innovation in Sichuan Province. It has established a postdoctoral innovation and practice base, as well as 3 provincial-level R&D centers. It is ranked among the top 50 companies in China’s nitrogen fertilizer industry, the top 100 private enterprises in China’s petroleum and chemical sector, the top 500 petroleum and chemical enterprises in China, and the top 100 private enterprises in Sichuan Province. Since 2006, the company has been employing \"circular economy\" approaches to address the issues of \"conservation and emission reduction\" in the chemical industry through top-level design of the product chain, thereby striving for sustainable and healthy development. All of Chuanjinxiang’s current products represent nodes in the \"circular economy industry chain,\" and they do not exist in isolation within the production system. Through material recycling and the hierarchical utilization of energy, the principle of \"maximizing resource utilization\" is achieved, which reduces the costs of various products; at the same time, it meets the environmental protection requirement of \"converting waste into resources\" through \"source control,\" thus enabling clean production. At the same time, the production technologies for Chuanjinxiang’s various products are at an advanced level in the industry; low consumption and low emissions are key indicators used by Chuanjinxiang to determine whether a production technology is advanced. Through the application and implementation of the three tools—advanced processes, advanced equipment, and reliable materials—optimal emission standards have been achieved in the production process of all products. The company was among the first 60 enterprises in the province to undergo pilot environmental credit evaluation, and it received an excellent rating for eight consecutive years (2014–2021). Chuanjin Xiang makes every effort to secure funding for the construction of environmental protection facilities. In addition to those facilities that must be built in accordance with the principle of \"three simultaneities\" (a technical term referring to design, construction, and operation taking place at the same time), the company has invested nearly 120 million yuan in advanced treatment methods for pollutants as well as measures for responding to environmental risks. An investment of 18 million has been made to reduce nitrogen oxides in the exhaust gases from three nitric acid production units; by using optimized catalysts and implementing SCR ammonia reduction upgrades, more than 120 tons of nitrogen oxides can be reduced each year (for all three units) ； With an investment of 12 million yuan, the country’s first integrated membrane treatment technology for **wastewater (patented)** was developed; this enabled advanced upgrades to wastewater treatment processes, thereby improving the efficiency of wastewater treatment and the rate of resource recovery – 1,000 cubic meters per day ； An investment of 20 million was made to carry out technical upgrades to the water treatment workshop’s multi-stage membrane osmosis system, resulting in a water savings of 1,000 cubic meters per day ； An investment of 6 million has been made to carry out optimized technical upgrades to the wastewater treatment systems, with short-cut nitrification-denitrification technology employed to ensure high-quality and stable discharge standards ； With an investment of 8 million yuan, and in collaboration with the municipal and park management committees, an emergency response team for safety and environmental risks, as well as a reserve depot for environmental emergency supplies, were established to cover the entire chemical industrial park. 2022: Achieve a 50% reduction in emissions. As part of its plans for 2022, Chuanjinxiang will recycle the saline wastewater discharged, thereby achieving a 50% reduction in emissions – from the current level of 2,000 cubic meters per day to 1,000 cubic meters per day ； Based on the current stringent atmospheric emission standards, modifications are made to reduce nitrogen content in combustion exhausts, with the goal of cutting overall nitrogen oxide emissions by 30%. In its future development strategy, Chuanjin Xiang will always adhere to the environmental protection principles of clean production and low-carbon energy conservation, keeping in mind its lofty goal of becoming a leader in sustainable development within the industry, and striving for progress through continuous improvement and collective effort.