Treatment method of high-concentration emulsion waste water

Abstract

The invention discloses a treatment method of high-concentration emulsion waste water. The method comprises the following steps of: pumping a high-concentration emulsion into an acidifying pond, adjusting the pH value to acid, standing, and isolating upper layer floating oil; pumping into a Fenton reactor, adding green vitriol, aerating, dissolving, slowly adding a hydrogen peroxide solution, adding a PAC (Poly Aluminum Chloride) solution for reacting, and adjusting the pH value of waste water to neutral after a reaction is completed; aerating, adding a flocculating agent to produce a flco, pumping into a first precipitating pond for precipitating, and introducing water discharged from the first precipitating pond into an anaerobic acidifying pond for performing anaerobic acidifying treatment; introducing water discharged from the anaerobic acidifying pond into an anoxic pond for performing anoxic treatment; introducing water discharged from the anoxic pond into an aerobic pond for performing aerobic treatment; and introducing water discharged from the aerobic pond into a second precipitating pond for precipitating, introducing water discharged from the second precipitating pond into a disinfecting tank for performing disinfecting treatment, and discharging disinfected discharged water within controlling index of the national standard. After a high-concentration emulsion is treated with the treatment method disclosed by the invention, various indexes of discharged water can reach the grade B standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).

Description

Technical field: [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for high-concentration emulsion wastewater. Background technique: [0002] Emulsions are widely used in metal processing such as grinding and forging, and their main functions are lubrication, cooling, surface cleaning and corrosion protection. With the prolongation of the use time, the alternation of cold and heat and microbial degradation will cause it to deteriorate, lose its original characteristics and utility, so it needs to be replaced periodically, so it will continuously produce waste liquid that needs to be treated. [0003] The main components of the emulsion are base oil (mineral oil, vegetable oil and synthetic oil), fatty acid, surfactant (non-ionic and anionic), co-surfactant, anti-corrosion agent, bacteriostat and various additives, among which the basic The oil content generally ranges from 1 to 10% (v / v). Due to different purpo...

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Problems solved by technology

The distillation method has a stable treatment effect on different emulsions, and the process is simple, but the energy consumption is large, the treatment capacity is limited, and it is easy to cause a fire; the combination of freezing / dissolving / ultrasonic treatment has a good treatment effect, but the disadvantage is that the operation is complicated and the treatment time is long The microwave irradiation method has fast processing speed and impact load resistance, but the processing process needs to be combined with acidification and demulsification; the filtration method includes sawdust bed filtration technology and membrane filtration technology. The sawdust bed filtration technology has low cost and simple operation, but it needs regular treatment and adsorption Saturated sawdust; membrane filtration has good treatment effect, simple operation, compact equipment, and low cost, but the membrane is easily polluted and is not suitable for treating emulsions containing small molecular oils

The electric coagulation demulsification effect is good, but the energy consumption is large, and the equipment is seriously corroded; the equipment for adding chemical coagulant is simple; the operation cost is low, but the treatment effect is poor; the generated sludge needs further treatment; the acid-base demulsification process is mature, But the amount of water to be treated is large

[0008] After the above method demulsifies the high-concentration emulsion, the content of pollutants such as COD in the clear liquid is still high, and because it contains a large amount of surfactant, its biochemical properties are not good, and further treatment is required to improve its biochemical properties and pass appropriate The biochemical process can meet the emission standards

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