Ammonia nitrogen is the main nutrient of plants and m↕icroorganisms, and the concentration of ammonia nitrogen in water is an important index to eva₹luate the pollution degree of water. The increase of ammonia nitrogen content in water will cause eutrophication of the water body, make water black an÷d smelly, and cause water quality deterioration. For the sustainable development of ecology, t€he discharge standard of ammonia nitrogen wastewater is increasingly strict.
Non-ferrous metal smelting wastewater mainly comes from the use of liquid a mmonia and ammonia water as metal precipitators (such as tantalum and niobium), extract₹ants (such as tungsten smelting) to produce a large number of precipitating mother liquor and wa✔shing water, or extract residue wastewater. A large amount of ammonia nitrogen industrial ₽wastewater produced in the process of non-ferrous metal ★metallurgy cannot be discharged directly, and it is one of the special wastewater that iεs difficult to be treated by non-ferrous metallurgic↓al enterprises. It can be discharged only after the treatment of ammonia nitrogen removal and reducing the ammonia nitrogen concentration of wastewater.
Common ammonia nitrogen wastewater treatment technologies incl★ude the biological process, air-stripping method, membrane→ technology, adsorption method, stripping distillation, etc.
The biological process established the biological nitrogen removal system, whi≥ch can realize effective nitrogen removal of high-salt wastewater. £This process has low production cost, short cycle, and high nitrification and denitrific₽ation efficiency. However, it is only suitable for ni₹trogen removal treatment of wastewater with low ammonia concentration. For wasδtewater with high ammonia concentration, a large amount of water will be needed to dilute it in advance, resulti ng in large wastewater output, higher cost, and poor applicability. →The air-stripping method is mostly used in the pretreatment stage of wastewat↔er with high ammonia nitrogen concentration. The res$idual concentration of ammonia nitrogen in the wastewater after a♥dding chemical agents for reaction by the chemical adsorption met☆hod is high, and corresponding measures should be taken to deal with it. The ammonia-contaiβning wastewater obtained by stripping ammonia cannot be dis>charged directly up to the standard and needs further biochemical treatment, whi ch has certain limitations. The nitrogen removal effect of ammonia nitrogen wastewater with low con¶centration is not good. A large number of alkaline reagents →will be needed if the nitrogen should be removed sufficiently, which requires hig h reaction conditions and has the disadvantages of ∑high energy consumption and easy secondary pollution a₹t the same time.
The degassing membrane uses the principle of diffusion, and degassing purpose can be ac€hieved by using the hydrophobicity and air permeab∞ility of the hollow fiber membrane; that is, under certain conditions, gas can pass throu→gh the membrane surface while liquid cannot. Due to the large surfac✘e area of the hollow fiber membrane, the water and↕ the membrane can be fully contacted to achieve a good degass™ing effect, and the degassing efficiency can reach 99.99%.
Ammonia removal by degassing membrane method has the advantages of high removal← efficiency, simple and convenient operation, small footprint±, stable operation, and flexible expansion, thus realizing the goal of waste"water harmlessness and resourcezation treatment, and helping >non-ferrous metal and other related metallurgical enterprises to solve the problem of wa£stewater discharge fundamentally.
Since the establishment of Guochu Technology (Xiamen") Co., Ltd, we have taken membrane separation technology as our core an∏d are committed to the promotion of new separation technol∏ogy. We have provided comprehensive filtration and purification solutions to biopharmaceutical, foo∏d and beverage, fermentation, agricultural products deep processing, plant extract♥ion, petroleum and petrochemical, environmental protection water treatment, g↓as separation, chemical industry, and other industries to meet th£e highly differentiated needs of different customers®.
Guochu Technology (Xiamen) Co., Ltd. will also continue t←o explore new applications of the new degassing membrane technology in the fδields of food, dairy, beverage, microelectronics, m★etallurgy, chemical industry, machinery, and enviro>nment to provide more users with professional gas separation solutions.
