The application of evaporation crystallization technology in wastewater treatment of purification plants is a revolutionary technological breakthrough, which has brought unprecedented changes to the field of wastewater treatment with its efficient and environmentally friendly characteristics.
In the wastewater treatment process of the purification plant, the evaporation crystallization technology shows unique advantages. This technology evaporates the water from the wastewater by mimicking the evaporation process in nature, leaving behind solid crystals.
This process not only effectively removes harmful substances from wastewater, but also realizes the recycling of water resources, which greatly reduces treatment costs. In addition, evaporation crystallization technology offers a high degree of flexibility. Depending on the composition and concentration of wastewater, the technology can adjust the evaporation rate and crystallization conditions to achieve the best treatment results. This makes evaporation crystallization technology extremely adaptable to a wide range of complex wastewaters.
According to the characteristics of the wastewater of the natural gas purification plant, the combination of two-stage RO membrane concentration + evaporation crystallization treatment technology was used to realize the effective separation of inorganic salt, organic matter and water. Due to the low TDS of wastewater, two-stage RO concentration was considered in the early stage, and after reaching a certain concentration, it entered the evaporation crystallization system, and realized salt separation in the evaporation system.
The evaporation crystallization system is widely used in salt production, nitrate production, treatment of high-salt wastewater, etc., and the technology is mature and reliable. In some areas, considering the balance of steam and electricity, the MVR+ multi-effect evaporation combined process can be used for treatment. According to the size of the treatment scale, single effect, multi-effect (up to five or even six effects) can be used to treat wastewater, and the energy saving effect is obvious. In recent years, the evaporation crystallization process has been successfully introduced into the natural gas purification plant, and has been successfully operated in the Moxi natural gas purification plant.
Taking the production wastewater of a natural gas purification plant in Sichuan as an example, the application idea of evaporation crystallization process in the wastewater treatment of natural gas purification plant, combined with the phase diagram of Na2SO4-NaCl-H2O, the evaporation crystallization salt separation process is illustrated. Evaporation crystallization is not only the process of separating salt and water, but also the solubility characteristics of each inorganic salt can be combined to extract salt step by step in the evaporation crystallization system, which can effectively separate the inorganic salts. The technology is supported by phase equilibrium, not only can be applied to the wastewater treatment of the purification plant, but also can be applied in the treatment of gas field water, underground brine, salt lake water, and wastewater containing a variety of inorganic salts.