On January 30, 2018, the China Environmental Protection Industry Association organized and organized an environmental protection technology achievement appraisal meeting on the “nanoplate ceramic membrane wastewater treatment technology and integrated equipment†developed by Guangxi Biqingyuan Environmental Protection Investment Co., Ltd. in Beijing. Academician Peng Yongxuan of the Chinese Academy of Engineering, Prof. Huang Xia of Tsinghua University, Wang Jialian of Jiaozuo Education High School of Tianjin Academy of Environmental Protection, Gan Yiping of Beijing Drainage Group, Beijing Municipal Engineering Design Research Institute Song Guijie Jiao Gao, Beijing Bi Shui Yuan Technology Co., Ltd. Li Locked up Jiao Gao, deputy general manager of Ai Bing, Beijing North Plaster Technology Co., Ltd. After being appraised, the expert committee unanimously considered that the results provided a highly efficient and practical process and equipment for the treatment of sewage (waste) water and reached international advanced level in the field of ceramic membrane (waste) water treatment applications.
Nano-plate ceramic membrane sewage treatment technology and integrated equipment passed the appraisal
"Nano-plate ceramic membrane wastewater treatment technology and integrated equipment" combines "nano-plate ceramic membrane separation technology" and "wastewater biological treatment technology" to form nano-flat membrane membrane wastewater treatment technology and integrated equipment, and optimize the key applications of technical equipment Parameters to achieve efficient treatment of dirty (waste) water. The ceramic membrane used in this equipment has the advantages of high strength, acid and alkali resistance, corrosion resistance, long life, high equipment integration and automation level, flexible and convenient operation, stable and efficient, and remote control.
The technical equipment is suitable for sewage (waste) water treatment in the areas of urban domestic sewage treatment, industrial wastewater treatment, rural domestic sewage treatment, livestock and poultry breeding and slaughter, etc. It has been applied to Hezhou Wanggao Sewage Treatment Plant in Guangxi, Guangxi Quzhou Pinglang Sewage Dealing with more than a dozen projects. After being tested by a third-party testing agency, the sewage treatment system meets the requirements of Class A of the Standard for Discharge of Pollutants from Urban Wastewater Treatment Plants (GB 18918-2002).
Ceramic film, also known as inorganic ceramic film, is an asymmetric membrane made of inorganic ceramic material through special process. Mainly with different specifications of alumina, zirconia, titanium oxide and silica and other inorganic ceramic materials as a support, the surface coating, high temperature firing. Commercialized ceramic membranes typically have a three-layer structure (porous support layer, transition layer, and separation layer) and are asymmetrically distributed, with filtration accuracy covering microfiltration, ultrafiltration, and nanofiltration levels. Compared with traditional organic membranes, ceramic membranes have excellent performances such as high temperature resistance, acid and alkali resistance, and high mechanical strength, and have become one of the membrane materials with rapid development and promising application. However, in addition to being used in large quantities in Japan's tap water field, high costs have been a major bottleneck in the commercialization of ceramic membranes.
In recent years, with the development of economies of scale in the manufacturing industry, the life cycle cost of ceramic membranes has gradually reached the zero point of growth, and further reduction of costs under the premise of maintaining high performance has become an important trend in this area. China's inorganic film component performance and technical indicators have been able to reach the level of similar foreign products, with the maturity of ceramic film production process and the cost reduction, a large number of ceramic membranes will be used in wastewater treatment, water reuse and other can only use organic film The field has broad application prospects.
The contrast between nano-ceramic membrane and ordinary ceramic membrane has the following advantages: (1) The function of nano-coating leads to the surface modification of ceramic membrane. Through the loading of nano-particles, the pore size distribution of ceramic membrane is changed, the trapping accuracy of membrane is improved, and the flux of membrane is also relatively low. Ordinary ceramic membrane is large, the treatment effect is improved, and the area is reduced. (2) Ordinary ceramic materials have brittle texture and poor toughness and strength (microhardness below 2000kN/mm2 at 100°C). When ordinary ceramics become nano-ceramics, the grain size decreases, so the hardness and strength of the material The nano-ceramic microhardness was 13000 kN/mm2 at 100°C. (3) Good chemical stability, acid, alkali, and organic solvents. In ordinary coatings, adding appropriate nanoparticles can greatly improve the coating's suspension stability, washability, adhesion, smoothness, anti-aging, etc., and have excellent thermal insulation effect in high temperature environment, not falling off , Do not burn, water, moisture, non-toxic, no pollution to the environment. (4) Long service life. Because of its poor toughness, ordinary ceramics are susceptible to a series of destruction processes such as micro-damage, twinning, interface failure, and crack propagation in the impact zone after impact, thereby reducing the anti-elastic properties of ceramic materials. The high activity and impact resistance of nano ceramics can effectively improve the anti-ballistic ability, enhance the anti-ablative and impact resistance, and prolong the service life. From the current use situation, the service life is at least 15 years. (5) The ability of anti-microbial contamination is strong, the nano-coating makes the surface of the ceramic membrane not easily interact with microorganisms, and the membrane surface has strong anti-pollution ability.
In the field of water treatment, the advantages of nano-plate ceramic membranes over organic membranes are: (1) acid and alkali resistance, high temperature resistance, high membrane flux, and high separation accuracy, so the applicable range is wider. In addition to general municipal sewage, It is difficult to biodegrade organic wastewater, oil and chemical wastewater; (2) long life and life cycle cost is more economical; (3) strong anti-microbial pollution, reducing the amount of cleaning aeration, more energy-efficient; (4) adapt to high pressure automatic Backwashing keeps membrane flux and process stability, reducing routine maintenance and saving maintenance costs.
Nano-plate ceramic membrane wastewater treatment process-level equipment is usually invested in the same process investment cost as a conventional membrane bioreactor, considering its life-cycle costs and effluent standards, land area, reuse of water, influent water quality treatment, sludge synthesis Treatment and other aspects, nano-plate ceramic membrane wastewater treatment technology has certain advantages.
Why say closed cooling tower is energy saving and environmental protection equipment, more and more users are using this kind of equipment to replace the original equipment (open tower), we can through data analysis and comparison, the two energy data accounting can be obvious. Energy consumption is basically two major aspects, one is water, the other is electricity. Both are energy costs that no cooling tower can escape, unless you leave the equipment on.
First of all, look at the consumption of water. Water is generally consumed in two aspects. One is the flying overflow after spraying, and the other is the evaporation consumption of water.
Let's look at the open cooling tower, the spray water of the tower is basically between two and three percent of the overflow rate, if we according to the daily operation of 10 hours, excluding holidays, 280 days of operation. According to the actual open cooling tower flow of 6000 cubic meters per hour to calculate. 6000*2%*10*280= 336,000 tons of water, and the same closed cooling tower, its spray flying overflow is very small, because after all, the spray work is carried out in the tower, almost can be controlled in a few thousandths, we calculate according to 5 thousandths, the same is 10 hours of work, 280 days a year operation, To achieve the same cooling amplitude is basically 4,500 tons per hour of closed cooling tower is enough, then the calculation results: 4,500 *0.5%*10*280= 63,000 tons, it is not difficult to see, because of the different design structure caused by the waste of spraying water resources, more than 200,000 tons of terror. The bigger the pool of the open tower, the more wasted water, because the evaporation area increases, and the closed cooling tower has no pool, so the consumption here is zero. Judging from the price of a ton of water, just such a equipment, a year to solve the capital of hundreds of thousands of enterprises.
Let's look at the comparison of electric energy, electric energy is not different, because they are all through the same power equipment to operate the equipment, the power of the two is similar, the running time is the same, basically the energy consumption is about the same.
To sum up, for the closed cooling tower energy saving accounting can be strong to open the tower out, and, today are advocating energy conservation and environmental protection, this is the general trend, so the closed cooling tower is more and more favored by the majority of users.
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