ã€Dry goods】 Application and Analysis of Petrochemical Sewage Treatment Technology
The composition of the oil chemical wastewater is complex, the water quality fluctuates greatly, the pollutant concentration is high and it is difficult to degrade, and the pollutants are mostly toxic and harmful organic substances, which cause serious environmental pollution. Of different types of petrochemical wastewater, often require different sewage treatment technology to achieve the desired effect. In recent years, petrochemical wastewater treatment research has become a hot spot, with a large number of new chemical, physical and chemical methods based on a large number of new treatment technologies.
First, the application of physical and chemical processing technology
(A) efficient flocculation flotation technology
As China's kerosene processing capacity continues to improve, the scale of wastewater treatment also need to expand in time. The wastewater reuse goal of wastewater treatment of water quality requirements higher. Flotation technology is the use of micro-bubbles to capture and remove finely divided water in the oil, emulsified oil, gum and suspended solids, both for the biochemical treatment to provide water quality assurance, is also commonly used in biochemical treatment, kerosene plant wastewater treatment is essential The unit. Among them, the impeller flotation has developed faster due to its simple equipment structure, less investment, less land occupation, low energy consumption and simple operation. In the impeller flotation degreasing technology, self-priming gas-liquid mixing impeller is one of the key. In order to solve the existing problems of the existing self-priming gas-liquid mixing impeller, a technology for removing oil and COD in the oily wastewater has been developed-the FYHG-DO impeller flotation degreasing technology. The technology of the impeller vacuum and inspiratory volume were significantly higher than the contrast impeller, a good solution to the coordination of inspiratory capacity and liquid absorption, willing to have a good gas-liquid mixing effect. The actual results show that the oil removal rate of oil-in-water wastewater is 67% and the COD removal rate is 31% after the oil in the grease trap is treated by the airfoil degassing technology. Experts suggest that industrial application test as soon as possible.
(B) photocatalytic technology
At present, Tio2 nanoparticle photocatalytic photocatalytic wastewater treatment has been recognized as advanced, but how to apply TIO2 to the industrial process of degrading toxic organic wastewater is a bottleneck of the development of photocatalytic technology in the field of environmental protection. Nanjing University of Technology Institute of Chemical completed TIO2 whisker photocatalytic treatment of refractory toxic organic waste water complete sets of technology and equipment to solve this problem. The project succeeded in producing nanometer-sized continuous photocatalytic wastewater treatment agent by the sintering method and the ion exchange method with external dimensions of micrometer size. Wastewater treatment efficiency of continuous photocatalytic wastewater treatment plant using TIO2 whisker catalyst is difficult to separate, recovery and industrialization problems compared with the pilot test. With TIO2 whisker photocatalytic degradation of printing and dyeing wastewater, can be untreated dyeing wastewater COD below 50mg / l, color less than 40 times (dilution factor), and can be benzene and other macromolecular organic compounds into Olefin compounds.
Second, the application of petrochemical wastewater biological treatment technology
(A) strain breeding technology
Using biological self-immobilization technology, the strains of oil-degrading bacteria, one strain of highly efficient degrading bacteria of pharmaceutical wastewater and two strains of highly degradable bacteria of coking wastewater were isolated and bred. The engineering application of the invented high efficiency bacteria has strong ability of degrading pollutants, After curing, it can be effectively retained in the reactor and maintain its degrading activity. They also isolated and screened eight strains of bacteria that degrade petrochemical and chemical fiber wastewater, and developed a special bio-filler suitable for efficient bacterial attachment. In addition, they established screening and culturing technologies for sulfate-reducing bacteria in high-suspended sulfur industrial wastewater, and separated 5 anaerobic desulfurization bacteria that can improve the biodegradability of wastewater and achieve the desired desulfurization effect. After the project put into operation to solve the problem of enterprise wastewater treatment, and indicators are better than the waste water drainage ticket, reducing the construction and operation costs.
(B) Biofortification (QBR) technology
Refining caustic soda wastewater is a strong alkaline, high concentration, biodegradable organic wastewater produced by refineries in the refining and desulfurization of oil products. It contains large amounts of neutral oil, organic acids, and biodegradable organic wastewater , With a large amount of neutral oil, organic acids, volatile phenol and sulfide and other toxic and harmful pollutants. Due to the high concentration of pollutants (COD about 2 × 105 mg / L, volatile phenol and sulfide about 3 × 104 mg / L, salinity of 150 mg / L or more), conventional methods were used to meet the treatment requirements. QBR technology is a high concentration, degradation of organic wastewater treatment technology, is the application of modern microbial culture technology in aerobic wastewater treatment technology system, through biofortification technology will be specific, live more than 10 times Volume load, the traditional biological test to deal with the high concentrations of highly toxic wastewater biochemical treatment, which greatly reduces the high concentration of organic wastewater treatment costs. QBR technology used for funding, operating costs only wet catalytic, incineration a fraction or a few one, simple operation and management, the treatment effect is stable, and does not produce exhaust gas and waste secondary pollution.
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