Metallurgical waste water treatment by PAM - CHINAFLOC
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Metallurgical waste water treatment by PAM
2015-06-11 09:33:08

  Metallurgical industry output a lot of air and water pollution, caused great harm to the environment. APAM anionic polyacrylamide flocculant iron and steel metallurgy sewage treatment, sewage flocculation metal particles form groups to achieve the purpose of sewage treatment, high efficiency, good effect.
  Metallurgical industry many products, the production process into a series of various discharge large amounts of waste water, waste water pollution is a major environmental water recycling is an important measure of metallurgical waste water treatment: development and adoption of clean water and without water or less new technology and less pollution, new technologies. Development of utilization, and thermal recovery of useful substances from waste gas, the reduction of fuel wastage of materials. Within enterprises of various water depending on the water quality requirements, the overall balance, streaming use, while improving the quality and stability measures to continuously improve the utilization of the water cycle. Development for metallurgical characteristics of the new wastewater treatment processes and technologies.
  Metallurgical waste water mainly from production processes, equipment cooling water, cooling water and steel site clean water and so on. Metallurgical wastewater contains large amounts of mercury, lead, arsenic, zinc and other heavy metals, as well as BOD, COD, phenol, cyanide and sulfide. Sewage complex composition, suspended particles, high metal concentrations, positively charged ions sewage, sewage PH value mostly neutral and alkaline. Must be treated before discharge, or would cause great harm the environment. Containing anionic polyacrylamide flocculant molecular chains -CONH2 APAM anionic groups, after flocculant flocculation and sedimentation, cooling and circulating water in order to achieve recycling.
  Metallurgical industries APAM anionic polyacrylamide flocculant is mainly used to remove the circulating water and impurity ions in the production process, generally used in the APAM molecular weight of 10 million or more preferably, about the use of 7-15g per ton of waste anionic polyacrylamide .
 Metallurgical industrial wastewater treatment commonly used redox treatment, wastewater oxidation-reduction method: the dissolved in wastewater toxic and hazardous substances, through redox reactions, into a new non-toxic substances, waste water processing method called wastewater oxidation-reduction method. Due to the high temperature water mills, oil and other organic matter and more difficult to achieve the desired common coagulant treatment effect, polyacrylamide special steel processing wastewater, flocculation and sedimentation fast, clear surface water, sludge dewatering well. You can determine the metallurgical waste polyacrylamide aqueous polymer hydrophobic association exhibited pseudoplastic fluid behavior, seen with increasing shear rate, the apparent viscosity of the solution decreases, or "shear thinning" phenomenon; when large shear rate, the apparent viscosity of the polymer solution to reduce the relatively slow. Thus, the flow pattern to fit the power law used herein, the water-soluble polymer hydrophobic association polyacrylamide metallurgical wastewater with the trends apparent viscosity and shear rate curve fitting power law flow better. Thus proving this article hydrophobic synthetic associative thickeners polymer product has good shear thinning. Rheological model hydrophobically associating water-soluble polymer shear rates within a certain range to meet the power-law fluid model, the apparent viscosity of the hydrophobic polymer solution are associated with increasing shear rate decreased, showing good scissors cut dilutive.
  Presence of metallurgical waste polyacrylamide is generally lowered so that the viscosity of aqueous polymer solution, which is captured as part of the water molecule ions, water molecules around the polymer reduced, so that the molecular chain is curled, and therefore most of the viscosity decrease with increasing salt . Hydrophobically associating polymers containing hydrophobic groups, making the hydrophobic groups tend to associate with each other in aqueous solution, because it increases the salt tolerance of hydrophobic groups not associated ions. Changes in metallurgical wastewater polyacrylamide commonly referred to salt sensitivity. Effect of salt on the viscosity of the polymer hydrophobic association behavior is very complex. This complex behavior and molecular structure of the polymer and its conformational behavior in solution of a relationship. Impact boils down into two aspects: First, the impact of a hydrophobic group, the second is the impact on the ionic groups. That salt influence of intramolecular association.