Removing device for COD in high-concentration alkaline wastewater

Abstract

The invention discloses a removing device for COD in high-concentration alkaline wastewater. The removing device comprises an acid and alkali neutralization device, a reaction tank and a filter presswhich are sequentially connected, wherein an alkaline wastewater collecting tank and a plasticization water collecting tank are connected onto the acid and alkali neutralization device, a flocculant blending tank is arranged on the reaction tank, and a flocculant inlet and an activated carbon inlet are arranged on the flocculant blending tank. The high-concentration alkaline wastewater is treatedin an acid and alkali neutralization, flocculation and filter pressing combined manner, on one hand, the COD content of high-concentration alkaline wastewater with the COD content of about 50,000 mg / Lcan be decreased to 1,300-1,600 mg / L, then, the wastewater is sent to an environmental protection process for degradation treatment, the environmental protection pressure is reduced, on the other hand, waste residues obtained after filter pressing can be directly sent to a power department for incineration after being unloaded, and the energy cost is saved.

Description

technical field [0001] The invention relates to a device for removing COD in high-concentration alkaline wastewater, in particular to a device for quickly removing COD in high-concentration alkaline wastewater produced by viscose fibers, and belongs to the field of viscose wastewater treatment. Background technique [0002] In the production process of viscose fiber, it is often accompanied by the discharge of alkaline wastewater, for example: the lye discharged from the dismantling of the plate and frame filter for filtering lye (COD content is about 50000mg / L), the washing water of the lye filter (COD content of about 10000mg / L), viscose filter washing water (COD content of about 25000mg / L), plasticizing water after spinning (COD content of about 5000mg / L). The above-mentioned alkaline wastewater with high content constitutes the source of 70% of the wastewater COD of viscose manufacturers. Therefore, the removal of COD in the above wastewater is also the key for existing ...

AI Technical Summary

Problems solved by technology

In the actual production process, the COD molecules precipitated in the waste liquid will quickly form a filter cake layer at the filter end of the filter press. Because the precipitated COD molecules are extremely small and flexible, the filtration gap of the filter cake layer becomes smaller, and the filtrate throughput is greatly increased. Reduced, which in turn leads to a rapid decline in filtration efficiency. Since the filtered COD filter cake has a water content of 40-50%, the heat that the filter cake can burn is relatively low. If it is directly fed into the coal furnace, it will cause difficulty in burning. Difficult to deal with

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