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The state attaches great importance to the doubt that drinking water in some regions of China is rich in fluorine, arsenic and other harmful microorganisms. At the executive meeting of the State Council for Ultra-Pure Water Treatment Equipment in August 2006, the main points were put forward as follows: to deal with the problem of drinking water safety as a key task, and to make every effort to deal with the problem that drinking water is rich in fluorine, arsenic, and other harmful microorganisms. Water quality is in danger of being salty and bitter; however, in terms of the geographical environment of China and other factors, for areas with perennial drought and little rain, lack of water resources, and poor water quality, only rural drinking water equipment can adopt filtration and purification treatment of their water sources, so that the treated water can meet the requirements of the state for drinking on a daily basis. Water standard, for everybody's daily drinking. So what kind of water treatment equipment to choose, what kind of leading skills to make water treatment equipment useful operation, to provide you with pure, high-quality water resources is the urgent need for school drinking water equipment to deal with the livelihood of the people's livelihood.
1. Selection Criteria of Water Treatment Equipment
The selection of water treatment equipment should be based on the criteria to ensure the safety of water use. Therefore, the following points should be done when selecting water treatment skills:
(1) Whatever skills and skills are chosen, the water quality after water treatment should reach the national drinking water standards on the day specified by the state.
(2) Skills safety and reliability criteria. Now, although there are many kinds of water treatment skills and equipment in China, it is necessary to select the equipment with the most advanced skills and the highest safety and reliability from a lot of skills theory and equipment.
(3) Minimum operating cost criteria for equipment. For China's remote and economically underdeveloped regions, if the operation cost of water treatment equipment is too high, which exceeds the economic capacity of local citizens, even if the water treatment construction project is completed, the meaning of construction will be lost because of the high operation cost of equipment which local citizens can not afford. Therefore, in the construction of water treatment equipment project, we must take into account the operation cost of the equipment.
(4) Easy-to-handle criteria. For the question of the relative shortage of equipment skill managers in underdeveloped regions, the request for equipment management and maintenance should be as simple and easy as possible. If the requirement of equipment handling skills is too high, which exceeds the capacity scale of equipment handling personnel, the normal operation and management of equipment will not be guaranteed.
2. Electric Flocculation Skills
2.1 Electric Flocculation Skills and Their Principles
The theory of electroflocculation technology was put forward at the beginning of the twentieth century. After nearly a century of practice and exploration, the real meaning of this technology was applied to water treatment equipment. The obvious feature of this technique is to use electric energy to separate heavy metals, solid suspended solids, emulsified organic substances and other harmful substances contained in water through electrochemical reactions. The working principle of the electroflocculation water treatment method is that after several steel plates in the water treatment equipment are added with direct current, the electric field between the steel plate and the steel plate will break out, and the water to be treated will flow into the gap of the steel plate. The electrified steel plate will enter the water partly because of the ionization effect, and the ionic and non-ionic pollutants in the electric field will be subject to the electric field. The effect reacts with the steel plate consumed in the water, which causes the ions and non-ionic pollutants in the electric field to form solid deposited particles, and then completes the water treatment by means of deposition separation.
2.2 Skill Flow of Electric Flocculation Water Treatment
The primary effect of the homogenization tank is to balance the difference between the pump water flow and the water flow in the electroflocculation reactor. In addition, a water level sensor is installed in the homogenization tank, which is mainly used to control the reactor pump and pump. Then the water in homogenization tank is pumped into the reactor through the reactor pump. The reactor is equipped with steel plate. After electrification, the steel plate reacts with the ionized ions to reach the treatment intention. In addition, there is a pneumatic valve and a pneumatic double diaphragm pump in the cavity of the reactor. Their effect is to remove iron scale and solid impurities deposited in the reactor, respectively. Then, the treated water is pumped to the defroth tank, the foam floating on the water surface and the two deposition of impurities in the water are removed. Finally, the water in the demineralizer will flow to the sedimentation tank, and the solid particles will be deposited again. After the sludge removal equipment, the solid particles and other impurities will be removed. The clean water will enter the sand filter, and the water will be washed back through the sand filter to complete the entire technical process.
3. Composite Multimedia Filtration Scheme
3.1 Compound Multimedia Filtration Method and Its Working Principle
Compound multi-media is a physical water treatment method. All technical processes do not need to add any chemicals. The equipment and units are integrated with automation and intelligent control. It has low energy consumption and high safety and stability. The medium replaced by water treatment equipment system will not pollute the environment and can be directly landfilled. Because the water treatment equipment system is an automatic control system and monitoring system, once the system procedures are set up, there is no need for too many people to monitor it in real time, which saves maintenance personnel's investment, and consequently saves maintenance costs.
3.2 Technical Process of Compound Multimedia Filtration
The water to be treated is pumped into the water treatment system by the pressurized pump of the raw water pressurization system, and is further treated by automatic backwashing multi-media. In the process, an activated carbon adsorption filter is installed in the automatic backwashing advanced treatment system. The effect is to remove the odor and chloride in the water. Equipment for removing arsenic and iron/manganese. The effect is to remove arsenic, iron/manganese and other impurities and harmful substances from the water. Scale inhibitor. Calcium and magnesium in water can be prevented from reacting to produce calcium carbonate after heating. Ultraviolet disinfection system for raw water. The primary effect is to sterilize the water in the pipeline network and decompose ozone.
4. Contrastive analysis
From the above analysis, we can see that the advantages of the electroflocculation technology water treatment method are far greater than that of the composite multi-media filtration method. Its advantages mainly lie in the following aspects: firstly, the electroflocculation skill water treatment method is more sophisticated than the composite multi-media filtration water treatment method, and the equipment operation cost is lower, and it is easy to operate. Processing, equipment life cycle is long. Secondly, from the economic point of view, the electroflocculation water treatment method may have a relatively high cost investment, but from the perspective of development, the annual cost of the electroflocculation water treatment plan is lower than that of the composite multi-media filter water treatment plan, which is mainly due to the composite multi-media filter water treatment method. The cost of replacing medium with more times per year is relatively expensive.
Therefore, for the selection of water treatment equipment in the construction of China's drinking water safety project, we advocate the selection of water treatment equipment by electroflocculation method.
Author: Hangzhou Water Shield Technology Co., Ltd.
Website: http://www.zjhzsd.com/
Key words: rural drinking water equipment, school drinking water equipment, ultra-pure water treatment equipment
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