Method for treating high-concentration organic wastewater in polymer polyol production process

Abstract

The invention discloses a method for treating high-concentration organic wastewater in a polymer polyol production process. The method comprises the following steps: (1) pumping mixed wastewater in a wastewater collection tank into an iron-carbon micro-electrolysis reaction tank; and adjusting the wastewater in the iron-carbon micro-electrolysis reaction tank is adjusted to be acidic, carrying out an oxidation-reduction reaction on the wastewater in the iron-carbon micro-electrolysis reaction tank, and enabling effluent after the reaction to automatically flow into a catalytic oxidation tank; (2) adding hydrogen peroxide into the catalytic oxidation tank, simultaneously carrying out aeration stirring, carrying out oxidation reaction under the catalysis of ferrous ions, and enabling effluent after the catalytic oxidation reaction to automatically flow into a coagulating sedimentation device; (3) adjusting the pH value of the wastewater in the coagulative precipitation device to 8-9, then adding anion PAM into the coagulative precipitation device, and carrying out solid-liquid separation after a flocculation precipitation reaction; (4) feeding the liquid subjected to solid-liquid separation into an A / O biochemical pool, and adding a nutritional agent into an aerobic pool at the same time, wherein the A / O biochemical pool comprises an anoxic pool and an aerobic pool which are connected in sequence; and a composite biological agent is added into the aerobic tank; and (5) enabling effluent of the A / O biochemical pool to enter a secondary sedimentation tank, performing solid-liquid separation, and directly discharging supernate after solid-liquid separation out of a pipe.

Description

technical field [0001] The invention relates to a treatment method for high-concentration organic wastewater in the production process of polymer polyols. Background technique [0002] Polymer polyol (POP) is mainly based on methyl azobisisobutyrate (AIBN) as the initiator, polyether polyol as the matrix, and at a certain temperature with acrylonitrile (AN), styrene (SM) and other monomers It is a mixture of polyether polyols, grafted polyether polyols, copolymers or self-polymers of AN and SM. The organic wastewater produced in the production process of polymerized polyol products, the basic components are polyether polyols, styrene, acrylonitrile, etc., has many types of pollutants, complex components, high concentration of organic matter, many toxic and harmful substances, and relatively high water quality fluctuations. Large size and poor biodegradability. Styrene in wastewater is a carcinogenic environmental hormone substance, which has the characteristics of lipophil...

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Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to overcome the problems of high-concentration styrene-containing wastewater produced in the production process of polymer polyol products, such as high biological toxicity, high styrene concentration, and difficulty in reaching the standard in effluent, and to provide a high-concentration organic water in the production process of polymer polyols. Wastewater treatment method, the treatment method can reduce the concentration of styrene in the effluent to below 1mg / L

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