Recycling and pretreatment methods of raw materials containing benzene thiazole alcohol pesticide industrial wastewater

A technology for producing wastewater containing benzoconazole, which is applied in natural water treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., which can solve the difficulty of increasing treatment costs, waste of products and raw materials, and improving treatment and other problems, to achieve the effect of good regeneration performance, efficient removal of recycling, and load reduction

Inactive Publication Date: 2011-02-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods start from the perspective of material degradation, which will increase the difficulty of processing, increase processing costs, and cause a lot of waste of products and raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Load 10mL of macroporous resin XDA-200 into four jacketed glass adsorption columns (Ф12mm×160mm) respectively, and set adsorption column I, adsorption column II, adsorption column III, and adsorption column IV. Containing benzoconazole pesticide production wastewater with a mass percentage of 49% H 2 SO 4 Adjust the pH value of the solution to 2, filter, the CODcr of the filtrate is 24000mg / L, and pass through Column I, Adsorption Column II, and Adsorption Column III at a flow rate of 40mL / h at a temperature of 40±2℃, and the processing capacity is 300mL / Batch. After resin adsorption, the effluent CODcr was 3570mg / L, and the CODcr removal rate was 85.1%.

[0021] Use 20 mL of 95% ethanol solution in sequence at 55±2° C. and pass through adsorption column I at a flow rate of 10 mL / h for desorption. The desorbed benzoconazole ethanol solution was distilled under reduced pressure at a pressure of 400 mbar and a temperature of 40°C to obtain a 95% ethanol solution. The benzo...

Embodiment 2

[0023] Switch the resin column in Example 1 so that adsorption column II, adsorption column III, and adsorption column IV are connected in series. The benzoconazole-containing pesticide production wastewater was adjusted to a pH of 3 with a 49% mass percent H2SO4 solution, filtered, and the filtrate CODcr was 26830mg / L. At a temperature of 30±2℃, the flow rate of 20mL / h was passed through the examples in turn Adsorption column II, adsorption column III, and adsorption column IV, the processing capacity is 240mL / batch. After resin adsorption, the effluent CODcr was 3625mg / L, and the CODcr removal rate was 86.5%.

[0024] Use 20 mL of 94% ethanol solution in sequence at 65±2°C and pass through adsorption column II at a flow rate of 5 mL / h for desorption. The desorbed benzoconazole ethanol solution was distilled under reduced pressure at a pressure of 400 mbar and a temperature of 40°C to obtain a 90% ethanol solution. The benzoconazole concentrate was dried in an oven at 105°C for...

Embodiment 3

[0026] Load 80 mL of macroporous resin XDA-200 into a jacketed glass adsorption column (Ф32mm×360mm), set up adsorption column I, adsorption column II, adsorption column III, and adsorption column IV. Containing benzoconazole pesticide production wastewater with a mass percentage of 49% H 2 SO 4 Adjust the pH of the solution to 4, filter, the filtrate CODcr is 25600mg / L, and pass through adsorption column I, adsorption column II, and adsorption column III at a flow rate of 160mL / h at a temperature of 25±2℃. The processing capacity is 1920mL / batch. . After resin adsorption, the effluent CODcr was 4240mg / L, and the CODcr removal rate was 83.4%.

[0027] Sequentially, 160 mL of 95% ethanol solution was passed through the adsorption column I at a temperature of 60±2° C. at a flow rate of 80 mL / h for desorption. The desorbed benzoconazole ethanol solution was subjected to vacuum distillation at a pressure of 400 mbar and a temperature of 40°C to obtain 85% ethanol solution. The benzo...

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PUM

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Abstract

The invention discloses recycling and pretreatment methods of raw materials containing benzene thiazole alcohol pesticide industrial wastewater. The treatment method comprises the following steps of: regulating a pH value of wastewater, and filtering and removing a suspended matter in the wastewater; enabling a filtering liquid to pass through an absorption column filled with macroporous resins; stopping absorption when the absorption reaches to a leakage point, and using ethanol as a desorprtion agent for desorption and regeneration to obtain an ethanol solution containing benzene thiazole alcohol; rectifying a desorption liquid, using the evaporated ethanol as the desorption liquid for recycling and using the obtained benzene thiazole alcohol as the raw material, and returning to the original production process. The invention is simple in operation, can recycle the benzene thiazole alcohol in the wastewater and effectively reduces COD (Chemical Oxygen Demand) of the wastewater, and the absorption resins have good regeneration performance and can be repeatedly used.

Description

Technical field [0001] The invention relates to a method for the recovery and pretreatment of raw materials of pesticide production wastewater containing benzoconazole, in particular to a method for enriching, separating and recycling benzoconazole in pesticide production wastewater by adopting a macroporous resin adsorption method. Background technique [0002] The waste water discharged by pesticide manufacturers during the production process usually contains organic nitrogen, organic phosphorus, sulfide, benzene ring, phenolate and other organic and inorganic substances. It is characterized by complex pollutant composition, high concentration, high toxicity, and biochemical Poor sex, it is difficult to treat industrial wastewater, and the pollution is wide and lasts for a long time. Residual pesticides will affect human health. [0003] At present, our country mostly adopts the combination of physical and chemical pretreatment and biochemical process for pesticide production was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07D249/12C02F103/36
Inventor 杨尚源余华东杜平陈英旭
Owner ZHEJIANG UNIV
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