Oil refining catalyst wastewater zero-discharging treatment method

Abstract

The invention relates to an oil refining catalyst wastewater zero-discharging treatment method. The oil refining catalyst wastewater zero-discharging treatment method comprises the following steps that (1) oil refining catalyst wastewater is treated in a high-density sedimentation tank to obtain sedimentation wastewater; (2) the sedimentation wastewater is fed into a multi-media filter to obtain produced water of the multi-media filter; (3) the produced water of the multi-media filter is fed into an ultra-filtration system and is further treated to obtain ultra-filtration water; (4) the ultra-filtration water is regulated to be weak-acidic and then is fed into a sea water desalination type reverse-osmosis system, and reverse-osmosis concentrated water is obtained through treatment; (5) the reverse-osmosis concentrated water is fed into an efficient electrodialysis system for concentration or into a conventional reverse-osmosis system for reverse osmosis respectively according to the salt content of the reverse-osmosis concentrated water; (6) the electrodialytic concentrated water is fed into a mechanical vapor compression (MVR) evaporator for concentration, the concentrated liquid is fed into a waste heat multiple-effect evaporative crystallization system, further evaporative concentration and crystallization are conducted on the concentrated wastewater, centrifugal dewatering is conducted on the concentrated liquid to obtain solid salt for recycling, and the produced water is reused. The oil refining catalyst wastewater zero-discharging treatment method is obvious in treatment effect and low in operation cost.

Description

technical field [0001] The invention relates to the field of treatment of oil refining catalyst wastewater, in particular to a zero-discharge treatment method for oil refining catalyst wastewater. Background technique [0002] The composition of refinery catalyst wastewater has its particularity. One is that it contains a large amount of dissolved solids, especially SO 4 2- , Cl - , dissolved silicon, etc.; the second is high content of suspended solids, and the third is high ammonia nitrogen. Emissions can be basically achieved through conventional treatment at an early stage. In recent years, as the national environmental protection regulations have become more and more stringent, the national discharge standard for saline wastewater will be introduced soon. For oil refining catalyst wastewater, the discharge of high-suspended solids and high-concentration saline wastewater has become an urgent problem for enterprises to solve. Although the existing conventional water ...

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Problems solved by technology

In recent years, as the national environmental protection regulations have become more and more stringent, the national discharge standard for saline wastewater will be introduced soon. For oil refining catalyst wastewater, the discharge of high-suspended solids and high-concentration saline wastewater has become an urgent problem for enterprises to solve. Although the existing conventional water treatment methods can achieve zero discharge, the treatment costs are too high for enterprises to afford

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