Process and device for oily wastewater treatment in metallurgical industry

Abstract

The invention relates to a process for treating oily wastewater in a metallurgical industry and a device thereof. The process is that: a first-level filter lattice and a second-level filter lattice are arranged in a relatively-closed tank body in parallel, and a filter material is a porous filter material; the filter material is prepared by combining and sintering the following components by weight percentage: 30-50 percent of metallurgical comprehensive sludge, 18-30 percent of coal gangue, 8-20 percent of metallurgical plant fly ash and 10-40 percent of pulverized coal. Oily wastewater is conveyed to the first-level filter lattice, and the oily wastewater passes through the first-level filter lattice to obtain first-level filtered water; the first-level filtered water is conveyed to the second-level filter lattice, and the first-level filtered water passes through the second-level filter lattice to obtain second-level filtered water; and after filtering is finished, the first-level filter lattice and the second-level filter lattice are subjected to back wash. The device comprises the tank body, wherein a filtering mechanism and a segregation board are arranged in the tank body. The filtering mechanism is segregated into the first-level filter lattice and the second-level filter lattice which are arranged in parallel along a vertical direction through the segregation board, and the bottom of the first-level filter lattice is communicated with the top of the second-level filter lattice through a connecting pipe.

Description

technical field [0001] The invention relates to the field of oily wastewater treatment, in particular to a process for treating oily wastewater in the metallurgical industry and a device thereof. Background technique [0002] Wastewater treatment and recycling in the metallurgical industry is widely used in industry. Energy conservation and emission reduction, treatment of waste with waste, and filtration treatment and recycling of wastewater with different water qualities are the development trends of water resource environmental protection and energy conservation. [0003] At present, the problem of oil content in wastewater treatment and recycling in the metallurgical industry is becoming more and more prominent. In the iron and steel industry, the oil content in hot rolling and high-line turbid ring water exceeds the standard, which affects the reuse of the process and is forced to be discharged, resulting in the difficulty of comprehensive wastewater treatment. big. Mo...

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Problems solved by technology

[0003] At present, the problem of oil content in wastewater treatment and recycling in the metallurgical industry is becoming more and more prominent. In the iron and steel industry, the oil content in hot rolling and high-line turbid ring water exceeds the standard, which affects the reuse of the process and is forced to be discharged, resulting in the difficulty of comprehensive wastewater treatment. Big

Moreover, the concentration of suspended solids and oil in the recycling return water used in the production line of iron and steel enterprises is relatively high, which will not only block the cooling nozzle, reduce its service life, and seriously affect the quality of the product

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