Water purifier membrane technology- MBR process applications
water purifier is a branch of the water treatment plant, provided that water can not be separated to support advanced membrane technology. Membrane technologies include water purifiers reverse osmosis membrane technology and ultrafiltration technology, a membrane is the core water purifier, in addition to the manufacturers to pay attention to brand building and market water purifier, the need to look inward, concerned about the industry membrane technology the latest developments.
In April of this year set up a membrane bioreactor (MBR) industrial technology innovation and strategic alliances, in Beijing recently released "China MBR White Paper." Although related businesses as the membrane technology to solve water shortages and water pollution in Chinas "golden key", the relevant broad market prospect. However, the white paper also admits that reduce the risk of MBR treatment capacity exists in the municipal wastewater treatment field, while investment and operating costs are still high market expansion challenges.
water purification membrane technology: MBR process applications to be careful
how to protect the water quality of the water retention capacity of large MBR technology in wastewater treatment plants should be extra careful [? 123]
Related statistics show that municipal wastewater MBR is the most important growth market. Currently, there are 60 sets of ton systems are used in municipal sewage treatment plants. Is expected next year, a total processing capacity will be more than 5 million m3 / day.
In spite of very significant advantages in dealing with water quality, but in dealing with the case of large fluctuations in water, the membrane module reliability is still subject to dispute. Related research shows the flow of sewage treatment plant will be with the seasons, weather, water and other composition and process scale change, and the change will have a greater impact MBR run this traffic.
Related Union official explained that, in the conventional activated sludge process, the peak value exceeds the design flow rate typically result in reduced efficiency of the process, but the peak flow weir will generally pass sedimentation tank. But there is a limit flux MBR process, membrane fouling exceeds a limit or because cause flux decline, excess water can not pass through the membrane pore size, which need to be distributed to another part of the flow of the processing facility for processing.
I understand that the MBR process running for some time, although hydraulic or chemical cleaning methods can be used to improve membrane flux to some extent, but the decrease is inevitable. And this has been a lot of MBR technology in the actual operation of the reflected.
Anti-professionalsYing, running early, the process can often meet the design scale, but with the accumulation of run time, continue to lower processing power, a lot of MBR sewage treatment facilities less than half the processing power of even the beginning of the design. "EPA that peak flow MBR process water shall not exceed 1.5 to 2 times the average flow rate that would otherwise require a large number of membrane modules spare pool or flow regulator is provided."
gives this White Paper the suggestion is, MBR can protect water quality, but can not guarantee the amount of water, large-scale MBR technology in wastewater treatment plants should be extra careful.
investment remains high operating costs, reduce operational cost optimization will be one of the development direction of MBR technology
In addition to large investment outside the membrane, MBR a high degree of automation, need more advanced equipment, also increased investment costs. According to the above domestic municipal sewage cubic meters / day treatment capacity of project data analysis, MBR tons of investment costs in 2000 to 2500 yuan (including civil engineering, membrane systems and other devices), more than one third higher than the traditional process.
In this regard, Union official says, in consideration to achieve the same quality, for a conventional activated sludge system with three filters, which makes both the investment gap will be reduced to 10 to 20%, while, the MBR technology will have a relatively large land-saving advantages.
In operation costs, and the MBR membrane processes electricity charges are much higher proportion of depreciation, mainly because of the aeration intensity is greater than the conventional process, high power consumption; backwash water while the membrane module, chemical drugs such as washing and replacement, have increased processing costs.
introduced a new technology in the application if the cost is too high, and that the technology just a lace technique, but useless, there is no market. For now, MBR technology on cost optimization needs further research to reduce energy consumption at runtime through technological upgrading.
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