Method for treating manganese-series phosphorized waste water

Abstract

The invention discloses a process for treating manganese phosphate waste water, which combines independent pretreatment and continuous treatment on output solution. The inventive process comprises processing acidifying demulsifying pretreatment on the cleaning waste liquid of degreasing slot independently, and processing coagulation deposition pretreatment on the cleaning waste liquid of phosphating slot, then combining the pretreated degreasing waste liquid and phosphating waste liquid , with normal-overflow washing waste liquid and other surface cleaning waste liquid and cleaning waste liquid without pretreatment to enter into following treatment, wherein the following treatment comprises aeration integral adjustment, first deposition reaction, inclined plate deposition separation, second coagulation reaction, air-float separation, sand filtration, and active carbon adsorption. The invention can effectively resolve the problems of phosphating waste liquid as instable water quality and high fluctuation impact load, with simple operation, high reliability, low cost, and environment protection.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment method for manganese-based phosphating wastewater. Background technique [0002] The sticking problem of oil well pipe joints is one of the common failure modes of oil well pipes. In order to prevent sticking, it is usually necessary to carry out manganese phosphating surface treatment on the joints. In the manganese phosphating production process, the workpiece needs to go through the pickling, neutralization, degreasing, water washing, surface adjustment, phosphating, water washing, rust prevention and other processes in the pretreatment section. In the above process, the water washing process often overflows and produces a certain amount Phosphating wastewater with serious pollution, the characteristic pollutants in the wastewater are phosphate, metal ions manganese, calcium, iron, nickel, etc., and also contain a small amount of...

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Problems solved by technology

[0004] The total amount of wastewater is small, the drainage of each section is uneven, the coefficient of variation is large, and the impact load is high, which will cause certain difficulties to the continuous operation of the treatment equipment, so this factor must be considered in the process selection

[0005] (2) The water quality is unbalanced and the fluctuation range is large

[0007] (3) The cleaning wastewater contains a large amount of oil. Most of the oil in the water exists in the form of emulsified oil, which increases the difficulty of treatment. It is discharged into the water body, destroying the reoxygenation of the water body, making the water body black and smelly, and destroying the ecology. system, sticking to fish strontium, causing fish death

[0008] It is precisely because of the above characteristics that no suitable method and device have been found for the treatment of manganese-based phosphating wastewater at pipe joints. The main problem is that if the design is made according to the highest concentration of water quality, the load rate of the equipment will be low and the investment will be low. There is a lot of waste; if it is designed according to the lower water quality that is usually discharged, there is a risk that the water quality will exceed the standard

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