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The high oil content of the production of waste water is generated in the two tank production process, the acidic, poor biodegradability, the wastewater containing the fluoride ions, with an inorganic acid or an inorganic salt mixed wastewater difficult treatment compliance. Design a set of lower operating costs, better treatment of the wastewater treatment process, the urgent need to solve the problem of the two cans industries. A company mainly produces aluminum two-piece cans, in the production process the washing wastewater as well as the process of washing and filling emulsion wastewater, its major pollutants CODcr, petroleum, sulfate, phosphate, the F-composite pollutants and washing wastewater biodegradability poor (BOD5/CODCr lt; 0.2), acidic large, high oil content of emulsion wastewater, poor mobility. The actual application requirements from two cans of wastewater treatment process selection, engineering design, construction, equipment installation, design a wastewater pretreatment system. Through the analysis of the the two enterprises tank wastewater quality, fully based on the comparison of the existing two cans wastewater pretreatment technology, the the emulsion wastewater and the washing wastewater pretreatment program. The emulsion wastewater pretreatment with 30% sulfuric acid the demulsification Joint efficient oil-water separator, and through tests to determine the the demulsification optimal pH of 2; using two of the the emulsion wastewater after washing wastewater and demulsification pH adjustment process process: 1) pH level adjusted CaCO3 filter bed wastewater adjusted to pH 4.0 to 5.0, while the fluoride ions in the wastewater, sulfate with CaCO3 filter bed release of calcium ions the reaction to generate calcium fluoride, and a small amount of calcium sulfate precipitate and remove CaCO3 filter bed upflow filter bed, violent reaction, resulting in the precipitation of a filter bed in the role of CO2 gas flowing into the next level reaction system will not be deposited on CaCO3 filter bed surface impact The release of calcium ions. 2) pH secondary regulator, the pH was adjusted to 7.0 by adding NaOH solution to 9.0, then adding a high-molecular flocculant PAC and PAM, to further strengthen the sedimentation effect, accelerating the separation of the mud and fine particles of the oil slick removal. Wastewater treatment station for a two tank companies detailed technical demonstration program, process design, project investment estimate and benefit analysis, and the construction of a wastewater treatment station. The results of the test run two cans wastewater treatment process enables CODcr F-, petroleum, sulfate and phosphate removal rates were 50%, 88%, 91.5%, 94% and 38%, can achieve the \Rational design of wastewater treatment process, strong impact, continuous automatic operation, reliable technology, economically viable technology has important practical significance and promotional value.
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