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Aluminum production category of acidic waste water treatment technology
aluminum production of acidic waste water treatment technology category of primary aluminum production of acidic wastewater from oxidizing acid etching process workshop, neutralization, oxidation process of aluminum manufacturer painting, the disposal of degreasing, pickling process, during which are rich in a variety of harmful substances or heavy metal salts. Acid mass fraction, lower is less than l %, higher than l0 %. Primary alkaline wastewater from oxidation workshop alkali corrosion of spraying, the disposal of alkaline cleaning process, etc. The mass fraction of alkali is higher than 5%, less than l %. Spraying, dyeing wastewater also occur. Waste water, in addition to rich in acid and alkali, often rich in oil, paint, fluoride salt and other inorganic and organic matter. Acid and alkali waste water has strong corrosive, subject to appropriate management can outside. Acid and alkali waste water management, general rule is: (1) high concentration of acid and alkali waste water, should first thinking back to use, according to the different water quality, water quantity and technical requirements, try to repeat use: such as repetitive use have difficult, or the concentration is low, water amount is larger, can choose the way of concentrated acid and alkali recovery. (2) the low concentration of acid and alkali waste water, such as pickling bath clean water, alkaline cleaning tank rinse water, should be neutralization treatment. About and disposal, and should be treated first thinking guidelines. Such as acid, alkali aluminum producers wastewater with each other or by using waste alkali ( Slag) Neutralizing acidic waste water, waste acid and alkaline waste water. Without these conditions, can choose neutralizer disposal. According to the national standard GB8978 & ndash; 1996 'water pollutant emission limit emissions requirements for: COD level & le; 60 mg/L, secondary & le; 120 mg/L, suspended solids & le; F - 100 mg/L, fluorine ions ≤ 10 mg/L, pH 6 & ndash; — 9. Modern wastewater disposal method first divided into physical treatment, chemical treatment and biological treatment method. 1) Physical disposal method in the separation and recover the waste water after physical effects of insoluble in suspended status of pollutants ( Including the oil film and oil bead) The waste water disposal method. General selection sedimentation, filtration, centrifugal separation, air flotation, transpiration of crystallization and the penetration method. Will be suspended solids, colloid content in the waste water and oil pollutants such as separation, to make waste water purified began. 2) Chemical disposal method through chemical reaction and mass transfer effect to separation, removing in the condition of dissolved and colloidal pollutants in wastewater or transformed into WuHaiWu qualitative wastewater disposal method. General selection method are: the neutralization, coagulation and oxidation recovery, extraction, stripping, blow off, adsorption, ion exchange and electricity penetration method. 3) Biological treatment method after microbial metabolism effect, make the waste water, colloid solution and the condition of fine suspended organic matter, such as poison pollution substances, into safe, harmless substances of waste water disposal methods. Biological disposal method is divided into aerobic treatment and anaerobic disposal of two ways. Aerobic disposal method of the current commonly used with activated sludge process, biological filter and oxidation pond, etc. Anaerobic disposal method, also called biological recovery disposal method, primary aluminum producers used for treatment of high concentration organic wastewater and sludge, using disposal equipment, the first for the digester, etc. The intention of the disposal of the sludge is: (1) reduce the sludge moisture content, create conditions for disposal, use and delivery of sludge. (2) to eliminate environmental pollution of harmful substances. (3) back power and capital to get hurt for profit. Sludge disposal measures, such as sludge concentration, sludge digestion, sludge dewatering, sludge as dry as a chip, etc. The intention of the sludge concentration is started to sludge dewatering and reduce the sludge volume provides conditions for subsequent disposal. The intention is to further dehydration of sludge dewatering, and make the sludge moisture content below 80%. The method has two kinds of mechanical dehydration and natural dehydration. Mechanical encapsulation-dehydration is divided into vacuum suction, pressure filtration and centrifugation. Its strength is high dewatering rate, covers an area of less, but paid more expensive. Natural drying/building and operating costs are low, but dehydration power is low, covers an area of big, bad health environment. Intention is to boring sludge dewatering sludge after heating, a further fall in moisture content, reducing the volume. Can't use rotary cylinder boring machine boring disposal. Its advantage is safe, secure job function, but covers an area of large.