And for the State Ministry of Science and Technology recently jointly issued "The state encourages the development of major environmental protection technology and equipment directory", November 22, China Machinery Industry Association and the China Environmental Protection Industry Association of Environmental Protection released a list of technical support unit. Tianjin Rong Xiang Pacific Environmental Science and Technology Co., Ltd. successfully developed due to ammonia gas and water membrane treatment of landfill leachate and wastewater engineering technology finalists. The technology can be widely used in petrochemical, rare earth, catalysts, pesticides, sludge dewatering, bio-pharmaceutical industry, to achieve effluent ammonia low-cost, efficient processing, about the general promotion of the country.
The results of the technical mysteries, Rong Xiang Chief Engineer Sun Shengli Pacific Company description: In the air-water two-phase membrane of the left is a high concentration of ammonia nitrogen wastewater, the right is the acidic aqueous solution. When the temperature is higher than the left side of 20 ℃, pH values ​​higher than 9, on both sides to maintain a certain pressure, the water in the ammonium ion becomes free ammonia molecule, and by the spread of raw material liquid to the membrane surface, the surface partial pressure in the membrane under the effect of absorption of fluid through the membrane into the hole, quickly and acidic solution of hydrogen ion concentration of the reaction up to 20% to 30% of the ammonium salt and an industrial raw material, and the ammonia nitrogen in wastewater was reduced to 8 mg / liter. This new technology and other technologies currently in use, not only investment, low operation cost, small footprint, stable, and the high and low concentrations of ammonia are ideal for wastewater treatment effect, the removal rate of up to 95 % to 99%.
Researchers also developed a magnetic catalyst pretreatment of wastewater ammonia, organic nitrogen into inorganic nitrogen, suspended solids and for good procoagulant role, a significant reduction in membrane fouling and membrane blocking probability. Gas-water treatment membranes, high concentrations of ammonia nitrogen in addition to wastewater technology with existing technology compared to lower investment, and significantly improve processing efficiency, the effluent ammonia concentration is less than 15 mg / liter. In addition, they used adsorbent - combined with the gas-water separation membrane technology to remove ammonia, low concentrations of ammonia makes large water filter waste water discharge standards to achieve adsorption, desorption liquid gas filter membranes treated recycled water, ammonium .
According to the Sun Shengli, the new technology, flexibility, strong, with a number of other processing technology, petroleum and chemical industry for the application of ammonia nitrogen wastewater treatment program. Up to now, the use of ammonia gas and water separation membrane technology, waste water treatment of small scale, pilot and industrial projects, nearly 200, the longest running more than 5 years. (Friends of the Yi)