The old steel plant site is contaminated by heavy metals.
The quality of heavy metal wastewater mainly comes from the product links of mining, electroplating, non-ferrous metal smelting, chemical industry and other industries, such as waste rock leaching, electroplating parts cleaning, steel plant pickling, non-ferrous smelting plant dust removal and drainage, chemical fertilizers , reagents, among which the main pollution sources of heavy metal wastewater are mining and smelting.
According to statistics, excessive wastewater discharged during the metal smelting process accounts for 35% of the total heavy metal pollution. Using reverse osmosis technology to treat wastewater containing heavy metal ions can make the permeate meet the national heavy metal wastewater discharge standards.
Due to the complex composition of heavy metals in the concentrate, the concentrate containing heavy metals can be directly reused or recycled through other technical means. Recycling is a direction worthy of exploration and further development.
The reverse osmosis method uses the principle of reverse osmosis to apply high pressure to the part containing wastewater, allowing water molecules to pass through the semi-permeable membrane as a solvent, thereby separating water from heavy metals and other solutes. One side of the semipermeable membrane contains pure water, and the other side contains high concentrations of heavy metals and other solutes.
Reverse osmosis is a highly efficient and energy-saving technology. It has the advantages of simple process, low energy consumption, convenient operation and control, no phase change process, and the ability to separate water molecules and ions in aqueous solutions.
Reverse osmosis water treatment equipment has reliable quality, strong scalability, reasonable structure, small footprint, high water utilization, low energy consumption, fully automatic operation, and simple operation and maintenance. The recovery rate of the system is generally above 75, and the desalination rate is above 98. It usually includes three parts: pretreatment system, reverse osmosis treatment system and post-treatment system.
Pollution, a Chinese word, refers to being stained with dirt or harmful substances or being affected by bad thoughts. It means contamination, contamination, and infection, which causes harm due to the spread of harmful substances. Pollution also has the meaning of false accusation. Tang Shao said in "Let the Minister of the Ministry of Officials Piao": "If the minister provokes you, he will be polluted."
Heavy metal music was first considered by some people to be the evolution of "hard rock" Come on, it’s actually not easy to distinguish between hard rock and heavy metal, and different people have different ways of distinguishing them.
Some people think that the music before the 1970s is called hard rock, and the music after the 1970s is called heavy metal. Most people think that they do not belong to the same category from a historical perspective. Blues has a strong flavor, and later spread to different places, forming different genres.
The music is very "heavy" and gives the listener a hysterical and manic feeling. It is obviously different from other music, so this kind of music is named "heavy metal".
There are many types of metal music. In terms of rhythm and melody, it can be divided into "melody metal" and "rhythm metal." In any case, metal music with melody is lighter than metal music without melody. Each genre of metal music uses different timbres, some with heavier distortion and some with lighter distortion.
This hard-core style has a very cathartic effect. This sense of weight seems to vent all the pressure on the human body in this way. This kind of music has a cold and hard atmosphere. , always gives people a very special feeling.