Primary treatment device for sewage in leather production

Abstract

The invention discloses a primary treatment device for sewage in leather production. The primary treatment device comprises a grating tank, wherein a water inlet pipe is arranged on one side of the grating tank, a water outlet pipe is arranged on the other side of the grating tank, two support rods are symmetrically arranged on the grating tank, a crossbeam is welded between the two support rods, a YQ-telescopic cylinder is fixed at the bottom of the crossbeam through a bolt and is fixedly connected with a residue collecting bin through a piston rod, and a motor is fixedly arranged on one side of the YQ-telescopic cylinder at the bottom of the crossbeam and is in transmission connection with a grating plate through a connecting shaft; and a scraping plate is arranged on a front shell of the grating plate, a first slide block and a second slide block are arranged at two ends of the scraping plate, and the first slide block is fixedly connected with an MYT3-23 hydraulic driver through a telescopic rod. According to the primary treatment device, the grating plate is in transmission connection with the motor and can be rotated out from the grating tank through the motor, so that the grating plate can be conveniently detected, maintained and cleaned.

Description

technical field [0001] The invention relates to the technical field of sewage preliminary treatment devices, in particular to a sewage preliminary treatment device in leather production. Background technique [0002] The general characteristics of tannery wastewater are complex composition, deep color, high suspended matter, high oxygen consumption, large fluctuations in water quality and quantity, suspended matter: a large amount of lime, broken skin, hair, oil residue, meat residue, etc.; COD: in Most of the materials used in leather processing are additives, lime, sodium sulfide, ammonium salt, vegetable tanning agent, acid, alkali, protease, chrome tanning agent, neutralizing agent, etc., so the COD content is large; BOD: soluble protein, oil , blood and other organic matter; sulfur: mainly sulfide produced by using sodium sulfide in the liming process; chromium: the chromic acid wastewater discharged from the chrome tanning process, the leather industry sewage is highly...

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Problems solved by technology

[0003] However, the existing sewage preliminary treatment device in leather production has some shortcomings in the process of use. The contact area between the grid plate inside the grid pool and the sewage is small, which affects its filtration speed. Secondly, the impurities easily attached to the grid plate matter, which affects the filtration efficiency of the grid plate, and the grid plate is generally fixed in the grid pool, which makes the inspection and maintenance more troublesome

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