China Education Equipment Purchasing Network News: According to the introduction of the Science and Technology Department of the Chengdu Institute of Biology, Chinese Academy of Sciences, the researchers of the institute isolated a strain of Pseudomonas, which can reduce nitrate to produce ammonia and adsorb metal ions under aerobic conditions. It can also reduce the metal ions and non-metal ions in the solution to a simple substance, which can be used for the treatment of wastewater containing metal ions and the removal of harmful metal ions and non-metal ions in soil and water. The research results were recently authorized by the State Intellectual Property Office for invention patents.
It is understood that although biological adsorption has been widely used in metallurgy, metal wastewater treatment and other fields, the current biological adsorption technology mainly uses non-growing cell adsorption, the adsorption efficiency is poor. There are few reports on the adsorption of metal and nonmetal ions by growing cells.
In order to protect the marine environment, scientists conducted in-depth research. They found that marine adherents like seawater with a pH of about 7.8. So scientists developed a coating composed of acrylic materials and silicates. This coating can form a layer on the bottom of the ship. Alkaline seawater with a pH value of 10 or more. When encountering such seawater, marine adherents will avoid it.
Another kind of damage comes from seawater corrosion. The use of metal materials is indispensable for marine construction and development. However, these materials are in the seawater for a long time, and rust, erosion, cracks and other phenomena will occur, resulting in great harm. According to statistics from 1970 to 1981, about 8% of offshore platforms had accidents, most of which were caused by corrosion. According to the latest statistics of China in 1999, the economic loss caused by corrosion is as high as 280 billion yuan, which is roughly 4% of the national total value, of which marine corrosion loss accounts for one third. Therefore, marine corrosion and protection have become an important topic for scientists. .
Scientists have discovered that seawater is a near-neutral electrolyte solution containing multiple salts and dissolved with a certain amount of oxygen, which determines the electrochemical characteristics of most metals subjected to corrosion in seawater. To this end, scientists have proposed electrochemical cathodic protection technology. They put the iron plate and the zinc plate into the seawater at the same time, and connect them with a wire. Zinc will lose electrons and be corroded. The iron will be protected by electrons. By installing metal with strong activity like zinc plate, the protector can be effectively protected. In addition to the cathodic protection method, there are thermal spray coating method and time retarder method for marine corrosion control. However, the cathodic protection method has small investment, fast effect, and long protection period. It can be widely used in ships, oil production platforms, and port facilities. There are three steel barges at the Heping Pier in Xiamen City, which were originally protected only by a paint layer. On average, they are overhauled every three to five years. The Second Department of the Fujian Institute of Material Structures of the Chinese Academy of Sciences adopted the cathodic protection method.
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