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Method for treating polyether polyol wastewater

A polyether polyol, wastewater treatment technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of insufficient mineralization of organic matter, reduced treatment efficiency, and safe operation Poor performance and other problems, to achieve the effect of easy industrial scale-up, lower processing costs, and high safety

Active Publication Date: 2014-04-09
NJTECH ENVIRONMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0015] Wet oxidation technology can treat complex organic wastewater, but wet oxidation technology needs to be carried out under the conditions of high temperature (125 ° C ~ 320 ° C) and high pressure (0.5 MPa ~ 20 MPa), so there are poor operation safety, large equipment investment and operation cost Higher disadvantages, so it is difficult to carry out practical application; Fenton reagent oxidation method has two main disadvantages in practical application: one, can not fully mineralize organic matter, often have part organic matter to be converted into some intermediate products in the reaction process, these The intermediate product either forms a complex with Fe3+, or competes with the OH generation route, thereby reducing its processing efficiency; secondly, Fe 2+ and H 2 o 2 The dosing concentration is high and the utilization rate is low, which leads to high treatment costs; photocatalysis and electrocatalysis are limited by wastewater turbidity and energy consumption, so the treatment efficiency is low, and it is difficult to scale up and high operating costs

Method used

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  • Method for treating polyether polyol wastewater
  • Method for treating polyether polyol wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1). The polyether polyol production wastewater of a petrochemical enterprise with a COD of 3000mg / L is subjected to catalytic oxidation pretreatment, and the pH value of the wastewater is adjusted to 3 with a 2mol / L sulfuric acid solution. The catalyst uses Al 2 o 3, the ratio of the amount of catalyst added to the volume of the reaction column is 1:8, and the oxidant uses 2000mg / L of chlorine dioxide. The COD drops to about 2500mg / L, the B / C ratio increases to 0.47, and then the pH is adjusted to 7.0 with 5mol / L sodium hydroxide solution.

[0040] (2). The effluent after catalytic oxidation is passed into the biochemical enhancement pool. The sludge in the pool is aerobic sludge. The dissolved oxygen concentration is controlled at 0.9mg / L, the pH value is 7.8, the ORP value is -100mV, and the hydraulic retention time is 7d. ,, C: N: P = 300: 7: 1 for equipment dosing, adding nickel chloride, the nickel dosage is 0.01mg / L, so that the sludge in the pool undergoes biol...

Embodiment 2

[0043] (1). The polyether polyol production wastewater of a petrochemical enterprise with a COD of about 2300mg / L was subjected to catalytic oxidation pretreatment, and the pH value of the polyether polyol wastewater was adjusted to 5.8 with a 2mol / L hydrochloric acid solution. The catalyst was activated carbon. The ratio of the amount of catalyst added to the volume of the reaction column is 1:10, and the oxidant uses 2500mg / L of sodium chlorite. The operation process is referred to in the patent: an enhanced oxidation process and device for treating organic poisonous waste water (publication number: CN101148287), so that the waste water COD dropped to 1850mg / L, B / C ratio increased to 0.62, and then 2mol / L potassium hydroxide solution was used to adjust the pH to 8.

[0044] (2). The effluent after catalytic oxidation is passed into the biochemical enhancement tank. The sludge in the tank is anaerobic sludge. The dissolved oxygen is controlled at 0.2mg / L, the pH value is 6, th...

Embodiment 3

[0047] (1). The polyether polyol production wastewater of a petrochemical enterprise with a COD of 5000mg / L was subjected to catalytic oxidation pretreatment, and the pH value of the wastewater was adjusted to 4.0 with 4mol / L sulfuric acid solution. The catalyst was activated carbon, and the amount of catalyst added and the reaction The column volume ratio is 1:9, and the oxidant uses chlorine dioxide of 4000 mg / L. The operation process is referred to in the patent: an enhanced oxidation process and device for treating organic toxic waste water (publication number: CN101148287), which reduces the COD of waste water to 3860 mg / L , the B / C ratio was increased to 0.55, and then the pH was adjusted to 7.5 with 2mol / L sodium hydroxide solution.

[0048] (2). The effluent after catalytic oxidation is passed into the biochemical enhancement tank. The sludge in the tank is facultative anaerobic sludge. The dissolved oxygen concentration is controlled at 0.5mg / L, the pH value is 7.0, th...

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Abstract

The invention provides a method for treating polyether polyol wastewater and relates to the technical field of treatment of refractory organic wastewater. The method particularly comprises the following steps of: carrying out high-efficiency catalytic oxidation pretreatment on the polyether polyol wastewater; and entering the polyether polyol wastewater to enter a biochemical stage, wherein the biochemical stage is divided into a biochemical strengthening stage and an aerobic treatment stage. Most dissolved micromolecule organic poisons in the polyether polyol wastewater are removed by high-efficiency catalytic oxidation; the biotoxicity of the polyether polyol wastewater is greatly reduced; a B / C ratio (the B / C ratio is improved to the range of 0.42 to 0.65) of high-efficiency catalytic oxidation pretreatment effluent is obviously improved; the biochemical treatment load is reduced; and the biochemical treatment effluent is ensured stable and is ensured to reach the standard. The treatment method disclosed by the invention has the characteristics that the treatment method is efficient and rapid, has low cost, is safe and reliable, is easy to realize the large-scale industrial application and the like.

Description

technical field [0001] The invention relates to a treatment method for organic chemical refractory wastewater, in particular to a treatment method for polyether polyol wastewater. Background technique [0002] Polyether polyol is an important chemical raw material. This product has a wide range of uses. It is mainly used in the production of polyurethane foam plastics. It is also used as a defoamer in the paper industry, a crude oil demulsifier, a lubricant, a quenching agent, and a latex foaming agent , rubber lubricants and special solvents, etc. Since polyether polyol itself and most of its production raw materials are refractory organic matter, the organic matter components in production wastewater are complex, high in concentration, strong in toxicity, and poor in biodegradability. [0003] In view of the fact that there are very few relevant literature reports on the treatment of polyether polyol wastewater at home and abroad, the existing treatment process mainly ado...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/34
Inventor 徐炎华陆曦朱小梅释秀鹏刘志英赵浩
Owner NJTECH ENVIRONMENT TECH CO LTD
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