CN102079605A - Novel process for zero discharge of glyphosate production waste water - Google Patents

Abstract

The invention discloses a novel process for zero discharge of glyphosate production waste water. Aiming at the characteristics that chemical oxygen demand (COD) concentration of glyphosate mother liquor is high, and the glyphosate mother liquor is difficult to degrade, a process of combing electromagnetism strong oxidization and multiple-effect evaporation concentration is adopted to carry out high-strength oxidation on glyphosate waste water under the action of an electromagnetic field, so that organophosphorus in the glyphosate production waste water is converted into orthophosphate, oxidized waste water is subjected to evaporation concentration, thereby recycling high value-added orthophosphate. By using the process, the zero discharge of the glyphosate production waste water can be reached, which meets the environment-friendly requirement.

Description

A kind of glyphosate production wastewater zero discharge treatment novel process

Technical field

The invention belongs to field of waste water treatment, disclose a kind of glyphosate production wastewater zero discharge treatment novel process that is used for.

Background technology

Glyphosate is a kind of broad-spectrum herbicide, and present main flow technology is IDA (IDAN) method and dimethyl ester method.In the production process of glyphosate, 1 ton of glyphosate of every production can produce crystalline mother solution 5-6 ton.The composition of glyphosate mother solution is very complicated, wherein contains the glyphosate of the 1%-2% that has an appointment, and 3%-4% increases sweet phosphine, and 1% phosphite also contains CaCl2 and HCl simultaneously, and total salinity is up to 15%-20%, and a certain amount of triethylamine and organic by-products etc., usually pH≤1.Therefore, the processing to this pollutant seems particularly important.This waste water quality index is as shown in table 1:

Table 1: glyphosate mother solution water-quality guideline

Color	The pH value	Total phosphorus (TP)/(mg.L-1)	Temperature (℃)
				Blue-greenish colour	<1	10200	20-30

Domestic initial very high praise employing membrane separation technique reclaims the glyphosate in the mother liquor, but test shows, (nanofiltration) is though membrane separation technique can make rare mother liquor desalination and concentrated, but its adaptability is not strong, be not that all glyphosate mother solutions can adopt nanofiltration membrane to carry out concentrating and separating, and the problem that also has film pollution and high running cost.Have advantages such as adaptability is strong though adopt anaerobic baffled reactor to handle sweet phosphine factory effluent, that is that all right is ripe for its technology.

The strong oxidation technology of electromagnetism is compared with the traditional water facture, has advantages such as unit sewage disposal investment intensity is low, floor space is little, workable, has actual using value aspect the glyphosate waste water improvement.

Summary of the invention

The invention provides a kind of glyphosate production wastewater zero discharge treatment novel process that is used for, the treatment process that has adopted the strong oxidation-evaporation concentration of electromagnetism to combine may further comprise the steps:

1), glyphosate mother solution waste water enters the iron filings reaction tank, adds proper quantity of lye then, the pH of regulator solution;

2) solution of regulating pH in the step 1) is added a certain amount of oxygenant, utilize the solid state reaction medium in the strong oxidizer of electromagnetic field energy and electromagnetism, carry out the electromagnetism oxidizing reaction;

3) with step 2) in the water outlet of electromagnetism oxidizing reaction enter Buffer Pool, the Buffer Pool water outlet enters neutralization tank, and the pH that regulates waste water with alkali lye is to neutral once more, enters that multiple-effect high-pressure evaporation system evaporates, crystallization treatment, reclaim orthophosphoric acid salt, reach " zero release " effect.

Description of drawings

Fig. 1 is the glyphosate production wastewater zero discharge treatment new technological flow figure that is used for of the present invention

Embodiment

The invention will be further described below in conjunction with specific embodiment, but not as a limitation of the invention.

Embodiment 1

Get the glyphosate production wastewater in certain chemical plant, measuring this waste water total phosphorus (TP) is 10200mg/L, and the wastewater treatment step is as follows:

1) get former water 1.5L, hydro-oxidation sodium is transferred pH=3, is heated to 60 ℃, and (mass percent is 30%, H2O2), adds gac, crosses hertzian wave 10 minutes to add a spot of ferrous sulfate and hydrogen peroxide again.

2) get the oxidation water outlet 700mL of step 1), heating evaporation, also surplus 100mL(is equivalent to concentrate 7 times to filtrate), take out crystalline material and weigh, be converted into 270.54g/L.

Embodiment 2

Get the glyphosate production wastewater in certain chemical plant, measuring this waste water total phosphorus (TP) is 10200mg/L, and the wastewater treatment step is as follows:

1) get former water 3L, add a certain amount of iron filings and soaked 24 hours, hydro-oxidation sodium is transferred pH=3, be heated to 60 ℃, (mass percent is 30%, H2O2) to add ferrous sulfate (FeSO4 7H2O) and hydrogen peroxide again, add gac (accounting for wastewater volume), cross hertzian wave 10 minutes than 15%.

2) get the oxidation water outlet 2L of step 1), heating evaporation, also surplus 50mL(is equivalent to concentrate 40 times to filtrate), crystallization effect is good, no oily matter appearance.

Above-described embodiment, the present invention embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in the technical solution of the present invention scope and replacing all should be included in protection scope of the present invention.

Claims (4)

1. one kind is used for glyphosate production wastewater zero discharge treatment novel process, and the treatment process that has adopted the strong oxidation evaporation concentration of electromagnetism to combine may further comprise the steps:

1), glyphosate mother solution waste water enters the iron filings reaction tank, adds proper quantity of lye then, the pH of regulator solution;

2) solution of regulating pH in the step 1) is added a certain amount of oxygenant, utilize the solid state reaction medium in the strong oxidizer of electromagnetic field energy and electromagnetism, carry out the electromagnetism oxidizing reaction;

3) with step 2) in the water outlet of electromagnetism oxidizing reaction enter Buffer Pool, the Buffer Pool water outlet enters neutralization tank, and the pH that regulates waste water with alkali lye is to neutral once more, enters that multiple-effect high-pressure evaporation system evaporates, crystallization treatment, reclaim orthophosphoric acid salt, reach " zero release " effect.

2. glyphosate production wastewater zero discharge treatment novel process as claimed in claim 1 is characterized in that:

1) glyphosate mother solution waste water at first enters the reaction of iron filings reaction tank, adds proper quantity of lye then, the pH of regulator solution;

2) solution that will regulate pH adds a certain amount of oxygenant, carries out oxidizing reaction in the electromagnetism oxidation furnaces;

3) the reaction water outlet with the electromagnetism oxidation furnaces enters Buffer Pool, and the Buffer Pool water outlet enters neutralization tank, and the pH that regulates waste water with alkali lye is to neutral once more, enters that multiple-effect high-pressure evaporation system evaporates, crystallization treatment, reclaims orthophosphoric acid salt.

3. glyphosate production wastewater zero discharge treatment novel process as claimed in claim 1 is characterized in that:

Described specific oxygenant is for being selected from dioxide peroxide (ClO2), ozone (O3), the hydrogen peroxide (H2O2) one or more as oxygenant;

Described specific solid state reaction medium for be selected from flyash, Attapulgite, wilkinite, zeolite, haydite or contain rare earth element and load transition element (iron, nickel, chromium, manganese) in one or more solid state reaction medium.

Described specific catalyst is to be selected from ferric sulfate, ferrous sulfate, single nickel salt, the cupric nitrate one or more;

Described specific alkali lye is to be selected from calcium oxide, sodium hydroxide, the magnesium hydroxide solution one or more;

4. glyphosate production wastewater zero discharge treatment novel process as claimed in claim 1 is characterized in that:

Described specific evaporation concentration is multifunctional evaporating equipment, vacuum-evaporation appts.

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