Method for treating wastewater generated in acetone production process

A technology of production process and treatment method, applied in biological water/sewage treatment, multi-stage water treatment, natural water treatment, etc. Difficulty in domestication of sludge, etc., to achieve the effect of high inhibition rate of activated sludge oxygen consumption rate, reduction of toxic effect of wastewater, and improvement of operation stability and treatment load

Inactive Publication Date: 2015-02-18
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high concentration of pollutants in the wastewater, COD is usually above 2000mg / L, and the highest can reach 8000-10000mg / L, which has a strong toxic effect on activated sludge microorganisms, and the inhibition rate of activated sludge oxygen consumption rate is high, making it difficult to domesticate activated sludge. At present, the wastewater lacks effective treatment technology, mainly through biological treatment after a large amount of dilution, the treatment cost is high, and the investment is large.

Method used

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  • Method for treating wastewater generated in acetone production process

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Effect test

Embodiment 1

[0028] A method for treating waste water generated in the acetone production process, including the following steps:

[0029] (1) Wastewater pretreatment: adjust the wastewater to a pH value of 2-7, then add a catalyst to it, and react at 20-60°C for 1-10min until the inhibition rate of the activated sludge oxygen consumption rate of the wastewater is reduced by 40%~90% drops below 10%, the concentration of the added catalyst is 5mg / L~100mg / L, the catalyst is ferrous sulfate, ferrous ammonium sulfate or ferrous chloride; adjusting the wastewater after the reaction The pH value is between 6.5 and 7.5.

[0030] (2) Aerobic biological treatment: Add nitrogen source nutrients, phosphorus source nutrients and micronutrients to the pretreated wastewater, and then carry out aerobic biological treatment;

[0031] (3) Removal of suspended organic matter: After aerobic biological treatment, the wastewater enters the sedimentation tank or air flotation tank to separate mud and water after coag...

Embodiment 2

[0045] Adjust the pH value of wastewater from acetone production to 2 with sulfuric acid, add 0.2g / L of ferrous sulfate, and after reacting at 60°C for 10 minutes, adjust the pH value to 7.5 with NaOH, and the inhibition rate of oxygen consumption rate of wastewater activated sludge decreases from 90% to 9 %. After adding ammonium sulfate, potassium hydrogen phosphate, and micronutrients to the wastewater, after aerobic treatment with activated sludge method (HRT=24h), the COD of wastewater decreases from 3500mg / L to 340mg / L, after coagulation and sedimentation treatment , The effluent COD drops below 80mg / L.

Embodiment 3

[0047] The pH value of wastewater from acetone production was adjusted to 7 with hydrochloric acid, and 0.05g / L ferrous ammonium sulfate was added. After reacting at 20°C for 1 min, the inhibition rate of oxygen consumption rate of wastewater activated sludge decreased from 40% to 1%. After adding ammonium phosphate and micronutrients to the wastewater, it is treated by aerobic biological fluidized bed (HRT=18h), the COD of the wastewater is reduced from 2000mg / L to 210mg / L. After coagulation and precipitation treatment, the COD of the effluent drops To below 80mg / L.

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Abstract

The invention discloses a method for treating wastewater generated in an acetone production process, which comprises the following steps: (1) wastewater pretreatment: (2) aerobic biological treatment: adding a nitrogen source nutrient substance, a phosphorus source nutrient substance and a trace nutrient substance into the pretreated wastewater, and carrying out aerobic biological treatment; and (3) suspended organic matter removal: sending the wastewater subjected to aerobic biological treatment into a precipitation tank or floatation tank to perform sludge-water separation, wherein no acetone is detected in the effluent water, and the COD (chemical oxygen demand) content is lowered to 100 mg / L below. The method disclosed by the invention has the advantages of high treatment load, stable operation and low treatment cost.

Description

Technical field [0001] The invention relates to a waste water treatment method, in particular to a waste water treatment method produced in the acetone production process. Background technique [0002] Acetone is a basic organic raw material, widely used in medicine, pesticide, paint and other industries. The cumene method is the mainstream production process of acetone. This process produces a large amount of high-concentration organic wastewater, which will cause greater harm if discharged into the environment. Due to the high concentration of pollutants in the wastewater, COD is usually above 2000mg / L, up to 8000~10000mg / L, which has strong toxicity to activated sludge microorganisms and high inhibition rate of activated sludge oxygen consumption rate, which makes it difficult to domesticate activated sludge At present, the wastewater lacks effective treatment technology, and it is mainly subjected to biological treatment after a large amount of dilution, which has high treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
CPCC02F1/24C02F1/66C02F3/02C02F3/1215C02F9/00C02F2103/36C02F2301/08C02F2305/06
Inventor 宋玉栋周岳溪于茵席宏波
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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