Supply of ion exchange resins, to deal with all kinds of water pollution, treatment options

First, the fouling of suspended solids and suspended solids in raw water treatment can clog the pores of the resin layer, thereby increasing its flow resistance, increasing the pressure drop operation will cover the surface of the resin particles, thereby reducing work-exchange resin capacity. In order to prevent fouling of suspended solids, mainly to strengthen the pretreatment of raw water to reduce the amount of suspended solids in water. To clear the accumulation in the resin layer of suspended solids, can increase the backwash frequency and duration of scrub or use compressed air and other methods. Commonly used chemical water desalination system for suspended solids requirements are generally as follows: chemical desalination unit suspended solids (mg / L) strong acid cation (co-current regeneration) <5 strong acid cation (convection regeneration) <2 strong acid cation (floating bed) <2 strong acid cation (downstream) → strong acid cation (floating bed) <5 male bunk beds, double room bed <2 male twin room floating bed <2 weakly positive (downstream) → strong acid cation (downstream) <5 weakly positive (downstream ) → strong acid cation (floating bed) <5 Second, the iron contamination and handling: cation and anion resins iron contamination may occur. Contaminated resin appearance of dark brown, black can become severe. Under normal circumstances, the iron per 100g resin exceeds 150mg, it should be handled. The presence of iron will accelerate the degradation of anion resin. Cation resin use, the raw water into the iron ions, most with Fe2 + exist, after they are absorbed by the resin, partially oxidized to Fe3 +, regeneration can not completely be H + exchange it, thus remaining in the resin caused by iron contamination. When using iron salts as coagulant, part of alum into the sun-bed, filtration and its accumulation in the surface of the resin layer, during reproduction, the acid dissolved alum, making Fe3 +, part of the sun is absorbed by the resin, resulting in iron contamination. Hydrochloric acid by a large number of Fe3 +, also cause some iron contamination on the resin. Yang sodium ion exchange resin used in more vulnerable to iron contamination. Anion resin iron content sometimes many times larger than the cation resin. Iron comes mainly from the anion resin regeneration solution. Usually diaphragm produced caustic soda, which contains from 0.01% to 0.03% of Fe2O3, also containing 6 ~ 7mg / L of NaClO3. Such caustic soda storage and transportation process in iron vessels, pipes (no coating) contact will generate ferrate (FeO4). After ferrate with lye into the anion bed, because lowering the pH value, the decomposition, the reaction is as follows: 2FeO42- + 10H + → 2Fe3 + + 2/3 O2 + 5 H2O Fe3 + further generate Fe (OH) 3, adhesion on the anion resin particles, resulting in iron contamination. After the resin contaminated iron, can not be removed in the regeneration process in general, it must be cleaned with hydrochloric acid. The cleaning method is commonly used with 10% HCl solution, before proceeding with this method, you must check the corrosion resistance of the switch device, it shall be used Inhibited hydrochloric acid. Will be equivalent to 0.5 times the volume of the resin bed 10% HCl solution into (taking into account the residual water in the resin bed inside, keeping the concentration of HCl solution), from the bottom of the resin bed thinning out the equivalent of residual water in the bed from the top of the resin bed The amount of water, and the solution was stirred and brought into contact with the resin 12 hours. Thinning out the acid, rinse from top to bottom, then backwash 30 minutes, remove loose material can be put into operation and the resin bed regeneration. Measures to prevent the occurrence of iron contamination of the resin are: 1. Reduce the iron content of the water in the sun beds. High iron content of groundwater should be treated through aeration and sand filtration in addition to iron and manganese. High iron content of surface water or iron salts as a coagulant, add the alkali chemicals, such as Ca (OH) 2 or NaOH, improve water pH value, preventing iron ions into the sun bed. 2. The high iron content of the raw water conveyance pipeline and storage tank corrosion should consider taking the necessary measures to reduce the iron content of the raw water. 3. Yin bed regeneration with caustic soda sump and pipeline corrosion rubber lining should be taken to reduce the iron content of alkaline regeneration solution. 4. When the resin of the iron content of more than 150g / gR, should be pickled. Third, pollution and treatment of calcium sulfate: When using sulfuric acid regeneration calcium type cation resin, if the concentration of the liquid regeneration is too high, or flow rate is too slow, the resin particles at close to regenerate the Ca2 + and SO42- concentration in solution over CaSO4 The solubility product will produce CaSO4 precipitation, attached to the resin particles, not only difficult to clean after regeneration, the eluate reacting total hardness, ion exchange, the operation will be dissolved in the water, the hardness content increase, decrease the amount of positive exchange bed. The solubility of calcium sulfate at 25 ℃ the product is 2000ppm, the solubility decreases with increasing temperature, and therefore difficult to remove. Measures to prevent the precipitation of calcium sulfate, First, reduce the concentration of sulfuric acid regeneration solution, it is to accelerate the regeneration fluid flow rate. Step regeneration method can also be used to make Regeneration concentration gradually increased, regeneration flow rate is slowing. Once the resin is precipitated with calcium sulfate, the most commonly used method is first with plenty of water softener backwash, then use ~ 10% HCl (3 bed volumes) to 2.0 L / h / L repeatedly washed, but should be noted HCl and calcium sulphate dissolution rate is very slow, and therefore must be repeatedly cleaned. Another method is to use sodium EDTA, but the price is high, and is an exothermic reaction, should be used with caution. Fourth, pollution and treatment of silicon: silicon compound contamination occurred in strong base anion exchanger, especially in strong, equipment, and systems combined with a weak type of anion resin, which typically results in an anion exchanger to remove silicon efficiency. Strong base anion bed resin regeneration inappropriate, failure of resin anion resin regeneration or not timely regeneration is not complete, silicic acid in the resin particle aggregation phenomenon occurs, and difficult to recycle, this phenomenon is accumulated in the silicon resin, not It belongs contamination of silicon. Reproducing means contamination of silicon out of the regeneration process, from the silicate resin, due to lower pH value of the regeneration, a large amount of colloidal silicic acid to precipitate regenerated liquid can become severe jelly, coated on resin surface, the impact of exchange capacity and causing water SiO2 content increased. Current regeneration fixed bed and moving bed general contamination of silicon does not occur. Silicon contamination mainly occurs in the silicon content of the raw water and the total anion content (excluding alkalinity) ratio high convective one bed regeneration, especially in the weak and strong anion exchange resin, devices and systems in combination. Washing soda available silicon dioxide pollution, the recommended dosage of 130 ~ 160 g / L, a concentration of 2.0%, treatment temperature is 50 ℃ ~ 60 ℃. Resin bed must first soak, such conditions do not permit, the solution may be a flow rate of 2 bed volumes / h through the resin bed, the key to this approach is to maintain a high temperature and contact time. The main measures to prevent contamination of silicon are: 1. Failure to timely regenerate the anion bed, not the failure of the standby state. 2. lye regeneration should be heated, Ⅰ type resin is not higher than 40 ℃, type Ⅱ resin is not higher than 35 ℃. 3. Reduce the regeneration solution concentration to 2% NaOH. 4. regeneration fluid flow rate of not less than 5 m / h, but it should be kept liquid feed playback time of less than 30min. 5. The Joint application system designed to ensure the weak from the resin to fail. Five oil pollution and treatment: mineral oil contamination of the resin is mainly adsorbed onto the skeleton or coated on the surface of the resin particles, resulting resin pore fouling, resulting in lower resin exchange capacity, decreased water cycle system. Sources of mineral oil: ■ the mineral oil into the ground with the raw water into the switch. ■ When using raw water mixed with steam heating, oil with the steam into the raw water. ■ atomized fuel oil-fired boiler using steam when the oil pressure is higher than the vapor pressure of heavy oil (or oil) leaking into the steam enters through condensable gas condensate desalination systems. ■ refinery or chemical plant processes oil by steam leak into the raw water. Chemical water desalination equipment in the oil content of 0.5mg / L, the resin can occur within a few months by the oil pollution phenomenon. Processing Oil Pollution resin approach: First, it should quickly identify the source of the oil, troubleshooting, continued to prevent oil from leaking into. If necessary, clean up the oil accumulated in the device. Slight contamination of resin does not necessarily need treatment, you can gradually resume its exchange capacity in a number of regeneration. Serious pollution of resin, through a small test should select the appropriate treatment. 1. NaOH solution cleaning cycle using 38 ~ 40 ℃ of 8% ~ 9% NaOH solution, from the base box (about 10m3) after the anion bed, sun bed, then back to the base tank cleaning cycle (the time determined by the small-scale test ), adding NaOH solution, maintaining concentration, use of mineral oil emulsification NaOH, and remove grease. 2. You can use petroleum ether solvent cleaning solvent naphtha or 200 resin cleaning, the cleaning process should be closely fire. 3. The use of a solvent and a surfactant wash combined volume of 20% of a resin solvent naphtha 200 and TX-10 (non-ionic, full name PVC octyl phenol) 20kg, was added after the switch, maintaining the temperature at 45 ~ 50 ℃, stirring with oil-free compressed air and scrub, 30 min before adding 200 kg TX-10 surfactant, and continue stirring the oil emulsion. Finally, the water from the top of the switch, the emulsion was removed from the bottom, to clean up. Sixth, organic pollution and treatment: organic pollution of anion resin causes and treatment methods are more complex, noted below. The company produces various models of anion and cation exchange resins. Including: 001 × 7 (732). 201 × 7 (717). Online Order Hotline; 15538339800 Sales Manager: Mr. .! The company website; www.hxtcj.cn welcome to negotiate in good faith to your satisfaction, my pleasure !! QQ number: 2859406221