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Sewage treatment method

A treatment method and sewage technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, natural water treatment, etc., can solve problems such as inability to remove ammonia nitrogen, high operating costs, waste water discharge, etc., and achieve biological toxicity Large, good treatment effect, high concentration of organic matter

Inactive Publication Date: 2014-04-23
NANJING CLEAR STREAM ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The utilization rate of neopentyl glycol produced by the condensation hydrogenation method is high, and the yield is over 90%. However, some unreacted materials and by-products will still form waste water for discharge. The main pollutants are isobutanol, isobutyraldehyde, Methanol, trimethylamine, etc., the concentration of sewage is very high, COD can reach 80000-100000mg / L, and the high concentration of trimethylamine contained in it is highly toxic to anaerobic or aerobic sludge and difficult to decompose
[0005] For the above sewage, the current treatment method is chemical oxidation, but this method has high operating costs and cannot remove ammonia nitrogen in sewage

Method used

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Embodiment 1

[0025] Such as figure 1 As shown, the neopentyl glycol production wastewater treatment process includes two parts: physicochemical pretreatment and biochemical treatment.

[0026] (1) Pretreatment

[0027] Due to the high concentration of trimethylamine in the high-concentration organic wastewater produced by the hydrogenation condensation method in the production process of neopentyl glycol, trimethylamine has a fishy odor and strong toxicity, and can inhibit the activity of bacteria in the wastewater, resulting in the inability of biological treatment of the wastewater. Therefore, its concentration must be reduced before biological treatment.

[0028] The first step in pretreatment is high-temperature gas stripping of wastewater. In the stripping tower, the sewage is sprayed from the top of the tower, and the steam enters from the bottom. The temperature of the discharged waste water is controlled at 95°C. Most of the organic matter such as trimethylamine in the waste wate...

Embodiment 2

[0040] A treatment method for neopentyl glycol sewage, comprising the following steps:

[0041] Step 1. Carry out high-temperature stripping of sewage, specifically, spray sewage from the top of the stripper in the stripper, and steam enters from the bottom; when performing high-temperature stripping of sewage, the temperature of the wastewater discharged from the stripper is 95°C.

[0042] Step 2, cooling the waste water discharged from step 1 to 40°C;

[0043] Step 3, pump the cooled wastewater into the resin adsorption tank for adsorption treatment; the flow rate of the wastewater in the resin adsorption tank is 10m / h, and the residence time is 20min; the resin adsorption tank is a cationic macroporous resin in the form of countercurrent regeneration Adsorption tank.

[0044] Step 4, adding a mixture of phosphate, cobalt chloride and molybdenum chloride to the wastewater after adsorption treatment, the amount added is 15mg / L, and then anaerobic biological treatment is carr...

Embodiment 3

[0054] A treatment method for neopentyl glycol sewage, comprising the following steps:

[0055] Step 1. Carry out high-temperature stripping of sewage, specifically, spray sewage from the top of the stripping tower, and steam enter from the bottom; when carrying out high-temperature stripping of sewage, the temperature of the waste water discharged from the stripping tower is 90°C.

[0056] Step 2, cooling the waste water discharged from step 1 to 30°C;

[0057] Step 3, pump the cooled wastewater into the resin adsorption tank for adsorption treatment; the flow rate of the wastewater in the resin adsorption tank is 8m / h, and the residence time is 25min; the resin adsorption tank is a cationic macroporous resin in the form of countercurrent regeneration Adsorption tank.

[0058] Step 4, adding a mixture of phosphate, cobalt chloride and molybdenum chloride to the wastewater after adsorption treatment, the amount added is 5 mg / L, and then anaerobic biological treatment is carri...

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Abstract

The invention provides a process for treating neopentyl glycol production sewage by hydrocondensation. The process is characterized in that neopentyl glycol production sewage is sequentially subjected to steam stripping, cooling, ion exchange, anaerobic biological treatment, and treatment through an A / O biological membrane. The process specifically comprises the following steps: feeding production sewage into a steam stripping column; heating to reach 95 DEG C; recovering materials from the sewage; cooling to reach 30 to 40 DEG C; transferring into an ion exchanger; adsorbing organic matters from sewage; then adding phosphate, cobalt chloride and molybdenum chloride to the sewage; performing anaerobic biological treatment; treating sewage through an EGSB (Expanded Granular Sludge Bed); transferring the water from the EGSB reactor into an anaerobic sludge recovery tank; feeding into an A / O bio-membrane reactor; denitriding and degrading the organic matters in the sewage; transferring the outlet water into a secondary precipitating tank to precipitate sludge until the water quality meets nationally specified drainage standard; and then draining up to standard.

Description

technical field [0001] The invention belongs to the technical field of clean production and water treatment, in particular to a treatment method for sewage generated in the process of producing neopentyl glycol by condensation hydrogenation. Background technique [0002] Neopentyl glycol, molecular formula C 5 h 12 o 2 , organic compounds, often used in the synthetic production process of chemical fibers, coatings, lubricants, etc. White odorless crystal, hygroscopic. Soluble in water, lower alcohols, ketones, ethers and aromatics, etc. Low toxicity, autoignition point 399°C, sublimation temperature 210°C. [0003] The production process of neopentyl glycol by hydrogenation condensation is as follows: the first step is condensation reaction, formaldehyde and isobutyraldehyde are condensed by aldol under the action of organic base (such as trimethylamine, triethylamine, etc.) to produce hydroxy pivalyl alcohol ( HPA), the second step is the hydrogenation reaction, HPA c...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36
Inventor 高俊怀王鑫
Owner NANJING CLEAR STREAM ENVIRONMENTAL PROTECTION TECH CO LTD
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