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Method for treating atrazine waste water and recycling resources

A technology of resource recovery and atrazine, which is applied in chemical instruments and methods, adsorption water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of undiscovered atrazine wastewater and resource recycling, and achieve The effect of realizing resource utilization, improving utilization efficiency and reducing energy consumption

Inactive Publication Date: 2012-05-09
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The results of literature search show that before the completion of the present invention, there is no report on utilizing activated carbon fiber adsorption to process atrazine wastewater and resource recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 4% sodium hydroxide aqueous solution to the wastewater containing 22 mg / L atrazine to adjust the pH value to 9, and filter to obtain a filtrate. Fill 2.5g of ST-1300 activated carbon fiber into the adsorption column with jacket Activated carbon fiber packing volume is 16cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 0.8L / h (50BV / h) at 20-25°C. The wastewater treatment capacity is 27L, and the concentration of atrazine in the effluent is 0.2mg / L. The removal rate was 99.1%.

[0028]Use 224mL of methanol with a volume concentration of 99% as the desorption agent, the desorption temperature is 55±5°C, and flow through the activated carbon fiber packed bed at a flow rate of 0.1L / h (6.25BV / h) for desorption. The desorption of atrazine The attachment rate is greater than 99%. Collect the first 112mL of desorption liquid containing high concentration of atrazine, distill it, distill methanol, and use it as the next batch of d...

Embodiment 2

[0030] Add an aqueous sodium carbonate solution with a mass concentration of 6% to the wastewater containing 22 mg / L atrazine to adjust the pH value to 9, and filter to obtain a filtrate. Fill 2.5g of ST-1300 activated carbon fiber into the adsorption column with jacket Activated carbon fiber packing volume is 16cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 1.6L / h (100BV / h) at 20-25°C. The wastewater treatment capacity is 22L, and the concentration of atrazine in the effluent is 0.2mg / L. The removal rate was 99.1%.

[0031] Use 224mL of methanol with a volume concentration of 95% as the desorption agent, the desorption temperature is 55±5°C, and flow through the activated carbon fiber packed bed at a flow rate of 0.12L / h (7.5BV / h) for desorption. The desorption of atrazine The attachment rate is greater than 99%. The first 112mL of desorption liquid containing high concentration of atrazine was collected, distilled, methanol was...

Embodiment 3

[0033] Add 3% sodium carbonate aqueous solution to the wastewater containing 22 mg / L atrazine to adjust the pH value to 8.5, and filter to obtain a filtrate. Fill 2.5g of ST-1300 activated carbon fiber into the adsorption column with jacket Activated carbon fiber packing volume is 16cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 0.6L / h (37.5BV / h) at 5-10°C. The wastewater treatment capacity is 28L, and the concentration of atrazine in the effluent is 0.2mg / L. Atrazine The removal rate is 99.1%.

[0034] Use 224mL of methanol with a volume concentration of 99% as the desorption agent, the desorption temperature is 45±5°C, and flow through the activated carbon fiber packed bed at a flow rate of 0.08L / h (5BV / h) for desorption. The desorption of atrazine The rate is greater than 99%. The first 112mL of desorption liquid containing high concentration of atrazine was collected, distilled, and methanol was distilled off as the next batc...

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PUM

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Abstract

The invention discloses a method for treating atrazine waste water and recycling resources, which comprises the following steps: adding diluted alkali into the atrazine waste water to regulate the pH value to 7.5-9; after filtering to obtain a filtrate, enabling the filtrate to pass through an adsorption column or absorption tower filled with activated carbon fiber under the conditions that the temperature is 2-40 DEG C and the flow rate is 10-150BV / h, and adsorbing the atrazine on the activated carbon fiber; desorbing and regenerating the activated carbon fiber adsorbed with the atrazine by using methanol as a desorbing agent under the conditions that the desorbing temperature is 30-62 DEG C and the flow rate of the desorbing agent is 2-15BV / h; finally, distilling the desorbing solution containing high-concentration atrazine, recycling the methanol to be used as a desorbing agent for the next time, and separating atrazine solids out of the residual solution at the bottom of the kettle, thereby recycling the atrazine; and in addition, using the desorbing solution containing low-concentration atrazine as an initial desorbing agent for the next time. The invention has the characteristics of high atrazine removing efficiency, high adsorption rate and the like, effectively treats the atrazine waste water, and recycles the atrazine.

Description

technical field [0001] The invention relates to the fields of pesticide waste water treatment and resource recovery and utilization discharged from pesticide and other industries. Background technique [0002] Atrazine, also known as Atrazine, is a synthetic chemical herbicide belonging to the triazine pesticides. Atrazine was put into commercial production in 1959. Due to its excellent herbicidal efficacy and low price, atrazine was widely promoted and used soon, becoming one of the most widely used and most important herbicides in the world. At present, atrazine still occupies an important position in weed control at home and abroad, and more than 80 countries in the world are using this herbicide. my country is one of the main countries that use atrazine, mainly for weeding in corn, sorghum, sugar cane, tea gardens and orchards. Domestic manufacturers of atrazine mainly include Zhejiang Changxing Zhongshan Chemical Co., Ltd., Zhejiang Changxing First Chemical Co., Ltd.,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/50C02F9/04C02F1/66C02F1/28
Inventor 唐登勇郭照冰陈敏东刘洁龙腾林志荣丁睿
Owner NANJING UNIV OF INFORMATION SCI & TECH