High-concentration organic and inorganic mixed wastewater treatment and recovery method

Abstract

The invention discloses a high-concentration organic and inorganic mixed wastewater treatment and recovery method. The method comprises the following steps of: a pretreatment process, namely removing suspended matters in water and partially reducing the chemical oxygen demand (COD) of the wastewater; a membrane purification process, namely filtering by using an organic and inorganic mixed or pure inorganic sintered tube, and removing flocs in the water for further purifying water quality; a multi-effect evaporation process, namely adopting a falling film evaporator or a compulsory external recycling evaporator in a first effect, adopting the compulsory external recycling evaporator in a last effect, generating steam and recovering inorganic salt crystals; an phase inversion extraction / reverse extraction process, namely contacting the steam with an extracting agent directly, making outlet water enter an intermediate water tank and recovering phenate; and a filtering and oil removing process, namely oil carried in water is removed and making the outlet water enter a detection water pool. The method is environmentally-friendly without secondary pollution; an extraction effect is improved by phase inversion extraction; and the inorganic salt crystals and the phenate are recovered by evaporated.

Description

technical field [0001] The invention relates to a process method for treating waste water containing phenol, high-concentration sodium sulfate, ammonium chloride and other high-concentration inorganic salts produced in the production of coal chemical industry, pesticides, chemical fertilizers and coal tar processing, and to the technical field of resource recovery. Background technique [0002] In the process of coal coke, gas purification and coking product processing and recycling, a large amount of organic and inorganic mixed wastewater containing high concentrations of phenol and sodium sulfate is produced, that is, coking mixed wastewater containing phenol and sodium sulfate; the high concentration of chlorine produced in the production of ammonium fertilizer plants Ammonium chloride and volatile phenolic wastewater, in which the organic components are mainly high-concentration phenols and cyanides, the components are complex, changeable, and highly toxic. In addition to...

AI Technical Summary

Problems solved by technology

In the first issue of "Plastic Industry" magazine in 2010, "Synthesis and Performance Research of Macroporous Resin for Phenol Treatment in Wastewater" introduced some new developments in adsorption methods, and also mentioned that the main disadvantage of this method is that it is difficult to regenerate the adsorbent. And the saturation time of the adsorbent for high-concentration phenol wastewater is too fast, and the impact of ionic strength brought by high salinity has not been investigated

The advantages of the incineration method and the current application status at home and abroad are mentioned in the article. The main problem is that the inorganic salts are incinerated to form very fine floating dust, which causes secondary pollution after settling.

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