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Micropneumatic diaphragm valve ultrafiltration device automation
In a five-star hotel 1000m3 / d direct drinking water projects used in hollow fiber ultrafiltration membrane, the outer diameter of about 1mm, the inner hole of about 0.7? Mm, the raw water filtered through the fiber hole, under pressure, Water through the membrane pores, together into the ultrafiltrate from the filter side outlet, the hollow fiber membrane does not require any support structure, with its simple structure of the filter device, equipment, low cost, according to the device volume and membrane area The ratio of hollow fiber membrane equipment to deal with water than the plate film 20 times higher. The treatment process used in the project is: tap water → original pool → sand → activated carbon → softening → fine water → clean rooms → rooms. Among them, sand filtration can remove most of the suspended solids in the water (SS of the effluent is up to 2 mg / L; SS with a precision of 5 μm can make the effluent SS reach 0.1 mg / L and the pollution index FI value can reach 3 to 5) ; Activated carbon and sodium ion softening resin can reduce residual chlorine in water, organic matter and divalent calcium, magnesium plasma content, thereby enhancing the water taste. The system shared two ultrafiltration devices, each device with ultrafilter 36, the 36 ultrafilter was divided into A, B two groups of 18 each. In the operation of the equipment according to changes in water production, adjust the set of the process time, isobaric pressure washes in a timely manner and with the membrane back to normal operation. Reverse backwash is very effective, but the quality of backwash water must be ultra-filtered water. To this end, in the design of the backwash process, or group A Ultrafilter output of the group B ultrafilter washed, or group B ultrafilter A group of ultrafilters washed water; ultrafiltration equipment used in super The outer dimensions of the filter is 90mm × 1000mm. There are about 2,000 hollow fiber ultrafiltration membranes in it. The membrane area is about 4m2. The material of the membrane is polyvinylidene fluoride. The material has stable chemical property, especially its pollution resistance is better than common PS, PAN and other membrane materials, is a new type of purification of water filter media timber. Although there are many advantages of hollow fiber ultrafiltration membrane, there are still many problems to be solved in practical application, otherwise, its use effect, especially the service life of the membrane will be greatly affected. The key problem is the membrane cleaning recovery problem. Involving cleaning timing, cleaning methods, cleaning agents, and several other aspects. The further purification of tap water for direct drinking water, and requires 24h of water stability, to ensure uninterrupted supply, which is a key equipment - ultrafiltration made a very high demand. In order to solve this problem, the ultrafiltration device has been designed and manufactured "Micropneumatic Pneumatic Diaphragm Valve automatic ultrafiltration equipment", the device in the cleaning time, cleaning methods and cleaning water to achieve automation. 1, automatic ultrafiltration equipment Microcomputer and pneumatic diaphragm valve, the use of large-scale integrated circuit microcontroller 89C51 as the core of the control chip to the pneumatic valve body as the implementing agency to hollow fiber ultrafiltration membrane module as the control object, to achieve the work , Isobaric cleaning, backwashing and chemical cleaning of the automatic process. Automatic ultrafiltration can not only reduce the work load, improve operational reliability, to prevent membrane damage caused by operational errors, more importantly, timely cleaning can be carried out in different ways to avoid irreversible membrane due to prolonged work due to pollution and congestion, Greatly extending the life of the membrane, the operator can directly through the keyboard to set the "water → isobaric washing → backwash → chemical cleaning" each program time, the control system consists of SCM board, keyboard display board, power board, power board and Electromagnetic pneumatic valve, the first micro-computer through the I / O interface and the solid state relay (SSR) to achieve the solenoid valve pneumatic control, pneumatic solenoid valve and then by the implementation of pneumatic diaphragm valve actuator control. 2, pneumatic diaphragm valve pneumatic diaphragm valve is an automatic ultrafiltration device plays a key role in implementing agencies, requiring reliable and flexible. Pneumatic diaphragm valve is different from the general manual valve, which is driven by gas pressure, the structure is divided into two parts, the upper part of the compressed air chamber, the lower part of the same general liquid diaphragm valve, the inflatable balloon, plastic bowl deformation, gas Pressure to promote the connecting rod and positioning bracket, the diaphragm valve pad pressed, this time to complete the closure of the valve action. When the pressure of compressed air is abruptly reduced, the diaphragm valve restores to its original position under the joint action of water flow pressure and the deformation resilience of the bowl, and the valve is opened. Membrane only fully open, fully closed two movements, the switch flexible and convenient, according to set the flow program, to accept the computer command to complete the opening and closing movements. The valve body is made of ABS plastic injection molding. Its mechanical properties, chemical properties and heat resistance are all good. It has no pollution to the water quality. The rubber lining in the valve and the plastic bowl are all made of high quality rubber. The internal cord is used for reinforcement. . 3, improve water utilization One of the characteristics of membrane filtration, that is, the filtrate in the membrane surface of the high-speed lateral flow, water impurities in the membrane surface is not easy to stay (with the original water flow), so the UF membrane is not easy to pollution. However, this will result in a large loss of water. Generally, the water utilization rate of tap water is up to 90% during the UF process of tap water, and 10% of the water is discharged, and about 10% of the water is sand- Activated carbon, softening, fine filtration and other processes after the water quality has been quite good, for which the addition of a reuse system in the design, the water recovery rate increased to 98.7%, only in the automatic cleaning equipment, the discharge of 1.3% water . During normal operation, the return water (or concentrated water) returns to the intermediate water tank provided on the by-pass side between the fine filtration and the ultrafiltration so that it is continuously replenished into the ultrafiltration device along with the fine filtration water . 4 Conclusion In ultrafiltration as the core technology of water treatment projects, sand filtration, activated carbon, softening, fine filtration and other water treatment process combined with ultrafiltration, water quality performance indicators to meet the design requirements, the total number of bacteria < 50 / mL, total coliforms <3 / L (sensory traits, general chemical indicators, toxicological indicators omitted). The entire system has been running for a year, after examination and testing showed that the equipment is operating normally, automatic control system to meet the technical requirements. The ultrafilter designed by ourselves is the first in China to develop the microcomputer control system and pneumatic diaphragm valve with stable performance and can be further popularized and applied in large projects.