The world's first aeration biofilter was put into production in France in 1981, and then widely used in European countries. The United States and Canada and other countries in the Americas in the late 1980s the introduction of this process, Japan, South Korea and China Taiwan has also introduced this technology. At present, the world's larger environmental protection companies such as the French company Deliman, Germany, Philip Mueller company, France VEOLIA company as a fist product in the world to promote. In mainland China, aeration biofilter is in the promotion stage. Dalian Malanhe Wastewater Treatment Plant is China's first municipal wastewater treatment plant using aeration biofilter process (designed by the Northeast Municipal Institute), Guangdong Xinhui Dongjiao Wastewater Treatment Plant using hydrolysis - aeration biofilter wastewater treatment process (designed by the CME MaYuan). In addition, part of China's industrial wastewater treatment also uses this technology. Many domestic scientific research and design units of aeration biofilter also carried out experimental research. With the continuous promotion and popularization of aeration biofilter in the world, many scholars in its structural form, function, startup and filter media and other aspects of the detailed study, and achieved a lot of results.
For decades, in the field of wastewater treatment, activated sludge method is undoubtedly a wastewater biological treatment technology that has been widely used and has good results. However, with the continuous progress of the society, the expansion of the city scale and the increasing attention of human beings to the living environment, the shortcomings of the activated sludge method are more and more prominent in front of people's eyes.
-Accommodation is huge: the continuous expansion of the population makes the city become crowded, and many cities have land scarcity, and the sewage treatment plant using activated sludge method often occupies several hectares or even dozens of hectares, which is undoubtedly becoming a constraint.
-The environment is bad: huge sewage treatment structures are exposed to the atmosphere in a large area, and it is very easy to produce odor pollution, which is intolerable to the surrounding residents. As a result, more and more residents are refusing to live next door to sewage treatment plants.
-Instable performance: Because it is a suspended state of microbial colloid, the concentration of activated sludge is usually below 6000 mg/liter, and the external environment (temperature, pollutant concentration, etc.) is very easy to have an impact on the treatment effect, and even cause sludge expansion, so that the treatment of water quality deterioration.
The eighties of last century, a new sewage treatment technology developed for the above problems were first used in France, which is the "submerged fixed biofilm aeration filter". France OTV in the submerged fixed biofilm aeration filter field has nearly 20 years of engineering design, construction and operation experience, and in the construction of more than 100 similar process around the world sewage treatment plant, one of the process is BIOSTYR (r) biofilter.
The BIOSTYR(r) is a new generation of modified upflow aeration biofilters. It can be used for secondary treatment of wastewater as well as for deep treatment of wastewater where the effluent needs to be reused and other requirements, and can achieve high discharge water quality standards.
Basic structure:
The BIOSTYR(r) process is a submerged upward-flowing biofilter, where the filter media is spherical particles with a specific gravity of less than 1 and floats in the water, which is referred to as the BIOSTYRENETM.
Each biofilter unit consists of:
-an inlet pipe and a distribution channel located at the bottom of the tank (which can be used for backwash water removal). removal of backwash water);
-two air firsts (orifice pipes), one for process aeration and one for air backwash; two pipes for nitrification/denitrification reactions, and the same pipe for aeration and backwash for a single nitrification reaction;
-3 to 3.5 meter layer of filter media, with a large number of microorganisms adhering to the surface of the filter media;
-concrete filter plates at the top of the tank, preventing the loss of filter media. filter plate to prevent the loss of filter media;
-A filter head is installed on the filter plate for the outlet of the filter tank.
Process principle:
The degree of nitrification reaction and denitrification reaction can be controlled according to the different settings of the position of the aeration pipeline, or the nitrification reaction or denitrification reaction can be carried out separately.
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