Study On The Mouth Suction Water Purifying Bottle And The Performance Anaysis

With the development of industrial and agricultural production, various toxic and harmful substances on water pollution is rising, simply by adding water or sand filtration, disinfection and other films has not purify contaminated water, and emergency water purification equipment, our field is still very backward ; In addition, with the improvement of living standards, people are more concerned about the safety of drinking water, especially in response to earthquakes, floods, mining accidents and other emergencies, the urgent need to provide safe, reliable drinking water health security. In the research the purification effect of a kind of mouth suction water purifying bottle was evaluated and the membrane fouling and cleaning was researched which lay a foundation for the application and generalization of the equipment. The research focus on the 4 aspects as below:Firstly, technologies of ultrafiltration membrane filter, active carbon adsorption, silver impregnated activated carbo(nor KDF) bacteriostasis integrated into the mouth suction water purifying bottle. The process: raw water→ultrafiltration membrane filter→active carbon adsorption→effluent water was adopted. The purification effect to the natural water in wild was evaluated, the result showed that: mouth suction water purifying bottle can remove organic matter, microorganism and decrease turbidity degree effectively. Purified water was tested, the result: CODMn<5mg/L, turbidity degree<0.2NTU,the removal rate of bacteria and Escherichia coli is more than 99.99%.Secondly, the characteristics of mouth suction water purifying bottle was investigated by researching the removal rate of CODMn,UV254,UV410 and bacteriostatic effect of silver impregnated activated carbon. The influencing factors of the removal effect were investigated. The conclusion was summarized as follows: In the same temperature, the relationship of permeation flux and transmembrane differential pressure of the ultrafiltration membrane was linear. The fitting equation y=0.283x+7.739, coefficient of determination R2=0.97; According to the same pressure difference operation mode, the relationship of temperature and membrane flux of the ultrafiltration membrane was linear too. The fitting equation y=0.548x+15.282, coefficient of determination R=0.991.Changes of the pressure difference and temperature will not affect the separation effect to the pollutants; pH value doesn't affect the membrane flux, however with the increasing of the pH value the removal rate of organic substance (represented by UV254) decreased; Pollutants in the early running was fast. Compacted the membrane surface and membrane hole , making membrane flux decline, but soon stabilized. With increasing temperature activated carbon adsorption declined. In acidic conditions, the adsorption capacity of activated carbon greatly increased; in 30 minutes the adsorption changed to be steady. Membrane intercepted 0.45μm~5ku larger molecular organics, activated carbon have a stronger adsorption to dissolved organic matter less than 5ku, and the rest can be removed effectively through the membrane interception and activated carbon pHysico-chemical adsorption. Combine the both to make up for the lack of a single water purification technology to ensure water quality. Silver zinc alloy filter and silver impregnated activated carbon can inhibit bacteria in sterile water up to 60 days. Compatible water purifying devices had continuous filtration 0.1m3and 1m3veteran ponds of water, the water quality indicators measured are eligible.Military-type net bottle: the total net amount of 440 grams, volume 1000ml. Overall dimensions are: high-220mm, length×width: 130×75mm, aluminum bottle made of A00 epoxy coating, looks like 65-Jun water pot. Net civilian-type bottle: the total net amount of 270 grams, volume 600ml, appearance size:Φ70mm×230mm, bottles made of PP nano.Compatible water purifying devices soaking experiments show that: UF membrane, ACF, GAC, ABS shell, bottle (A00 Al + epoxy resin coating material,PP nano) are met "in Drinking Water, Hygiene and Safety Equipment and Protective Materials Evaluation Norms" (2001). Membrane material temperature, corrosion and tensile experiments show that: bottle materials (A00 aluminum and food grade epoxy coating), PVDF membrane and its components 30min at 100℃when the temperature becomes red sauce, but remain original removal; bottle materials (A00 aluminum and food grade epoxy coating,PP nano), PVDF membranes can be tolerated 1000mg/L sodium hypochlorite, 1% to 5% hydrochloric acid and 10% sodium hydroxide solution; PVDF membrane can not withstand a strong vertical and horizontal wire to pull, so should pay attention to objects and the use of external force on the membrane damage.Thirdly, membrane pollution was assessed from the qualitative and quantitative point, and membrane life was preliminary calculated. The results shows that clean pollution-free membrane outer surface SEM pHotograpHs were clean, smooth and dense, while the film surface becomes rough after pollution and has massive deposits. Membrane continuous operation 3 days, the membrane resistance is mainly from the adsorption resistance and the membrane pore blockage caused by concentration polarization resistance, which provided a reference for the subsequent membrane cleaning.Fourthly, the fouled membrane was cleaned by ways of pHysical backwash cleaning and chemical cleaning. The cleaning results show that, due to the pHysical backwash cleaning relies on the combined effects of the membrane wire jitters and shear stress between the bubbles which decrease the viscous force of the pollutants and make organic matter easily peeled off from the membrane surface, then washed away by water, but the way of cleaning cannot remove the membrane pore internal pollutant. Finally, L183(7) orthogonal test was done to determine the best conditions for membrane cleaning and best cleaning agents:at 40℃with alcohol wash for 10 minutes. Polluted before and after the membrane wire weighing, weight gain after fouling 11.03%.