Water treatment industry has become a hot industry in recent years. The tightening of environmental protection supervision is the main driving force for the development of China's water treatment industry in recent years. On the one hand, we will quickly push forward the construction of municipal sewage treatment infrastructure; On the other hand, industrial enterprises are forced to increase investment in environmental protection and reduce pollutant emissions. The price of industrial water continues to rise (especially in some water-deficient areas) and the cost of water treatment is falling, which will push the sewage treatment of industrial enterprises from "passive bid raising" to "active water saving and water reuse". Therefore, the market demand of the water treatment industry has gradually changed from policy-driven to "policy+market" dual-driven. Policy and market factors are the two wheels driving the development of the water treatment industry. China's industrial sewage treatment market will have great potential.
Today we will learn about MBR, the fastest growing and most widely used MBR in the sewage treatment industry.
MBR(Membrane Bio-Reactor) is a new water treatment technology that combines membrane separation unit and biological treatment unit. The core of the process is the membrane bioreactor, which is mostly used to replace the secondary sedimentation tank with a larger occupied area in water treatment. The main function of the secondary sedimentation tank is to separate the sludge from the water, which is relatively passive and depends on the density difference between the sludge and the water to settle down by itself. However, MBR process appears to be more active, actively pumping water from the sludge tank and intercepting the sludge with a membrane. Therefore, the membrane stops the sludge and lets the water out at the same time. The membrane technology directly affects the effluent effect.
Membranes and membrane technologies began to exist at the beginning of the 20th century. The first membrane bioreactor (MBR) was born in the late 1960s and was developed by Dole-Oliver Commercial Company in the United States. The technology combines ultrafiltration with traditional activated sludge process (CASP). In this stage of research, MBR research focuses on the research and development of membrane separation devices to make them suitable for high concentration activated sludge. However, the film production technology was backward at that time. At the same time, the society at that time did not have strict requirements for water quality discharge, which led to the long-term research on this technology in the laboratory and did not form large-scale production. In the 1990s, the Japanese government jointly developed MBR with many large companies. Jiubaotian Wastewater Recovery Plant built the first flat MBR and began to popularize it. It has been applied in Japan and many neighboring countries. In the 1990s, more and more European countries used MBR to treat domestic wastewater and industrial wastewater. The research and development of MBR in China began in 1990 and began to be formally applied in water treatment in 2006. After 2010, the application of large-scale MBR engineering gradually matured and began to be widely applied in different fields.
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