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Method for treating malachite green wastewater and recycling resources

A malachite green and wastewater treatment technology, which is applied in the directions of water/sewage multi-stage treatment, adsorption water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of undiscovered malachite green wastewater and resource recovery, and achieve Realize the effect of reuse, reduce consumption, and adapt to a wide range

Inactive Publication Date: 2010-07-28
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Literature search shows that before the completion of the present invention, there is no report on utilizing activated carbon fiber adsorption to process malachite green wastewater and resource recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add an aqueous sodium hydroxide solution with a mass concentration of 6% to the wastewater of 100 mg / L malachite green to adjust the pH to 6, and filter to obtain a filtrate. The 3.0g model is the activated carbon fiber of S-1300 packed in the glass adsorption column that has jacket ( 15×150mm), the activated carbon fiber filling volume is 20cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 25BV / h (0.5L / h) at 20-25°C. The wastewater treatment capacity is 7.0L, and the concentration of malachite green in the effluent is 0.06mg / L. Malachite green The removal rate is 99.94%, and the adsorbed water is discharged directly.

[0031]Use 240mL of hydrochloric acid-ethanol solution as desorbent, wherein the molar concentration of HCl is 0.1mol / L (take by weighing 2.4g of concentrated hydrochloric acid with a mass concentration of 36.5% and pour it into a 250mL graduated cylinder, then add 95% ethanol and stir to determine up to 240mL)....

Embodiment 2

[0033] Add 2% sodium hydroxide aqueous solution to the 10 mg / L malachite green waste water to adjust the pH to 6, and filter to obtain the filtrate. The 3.0g model is the activated carbon fiber of S-1300 packed in the glass adsorption column that has jacket ( 15×150mm), the activated carbon fiber filling volume is 20cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 40BV / h (0.80L / h) at 20-25°C. The wastewater treatment capacity is 80L, and malachite green cannot be detected in the effluent, and the removal rate of malachite green is 100%. %, the adsorbed water is discharged directly.

[0034] Use 240mL of hydrochloric acid-ethanol solution as desorbent, wherein the molar concentration of HCl is 0.15mol / L (take by weighing 3.55g of concentrated hydrochloric acid with a mass concentration of 37% and pour it into a 250mL graduated cylinder, then add 97% ethanol and stir to determine up to 240mL). The desorption temperature is 20-25°C, a...

Embodiment 3

[0036] Add 10% sodium hydroxide aqueous solution with a mass concentration of 10% to the 250 mg / L malachite green wastewater to adjust the pH to 6, and filter to obtain a filtrate. The 3.0g model is the activated carbon fiber of S-1300 packed in the glass adsorption column that has jacket ( 15×150mm), the activated carbon fiber filling volume is 20cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 15BV / h (0.3L / h) at 20-25°C, the wastewater treatment capacity is 2.5L, the effluent malachite green is 0.08mg / L, and the removal rate of malachite green It is 99.97%, and the adsorption water is discharged directly.

[0037] Use 240mL of hydrochloric acid-ethanol solution as the desorbing agent, wherein the molar concentration of HCl is 0.15mol / L (its preparation process is the same as in Example 2). The desorption temperature is 20-25°C, and the flow rate of 6BV / h (0.12L / h) flows through the activated carbon fiber packed bed for desorption,...

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PUM

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Abstract

The invention discloses a method for treating malachite green wastewater and recycling resources, which comprises the following steps: adjusting pH to be between 3.5 and 7 by adding diluted alkaline into the malachite green wastewater, filtering the malachite green wastewater to obtain filtrate and making the malachite green wastewater flow through an adsorption column or an absorption tower filled with activated carbon fibers, so that malachite green is absorbed onto the activated carbon fibers; directly discharging absorption effluent when the pH of the effluent is 6 to 7, and if the pH of the absorption effluent is lower than 6, rationally adding the diluted alkaline into the absorption effluent until the pH is adjusted to be between 6 and 7 and then discharging the absorption effluent; taking the solution of hydrochloric acid and ethanol as a desorbent and performing desorption and regeneration on the activated carbon fibers absorbing the malachite green; distilling a desorption solution containing high-concentration malachite green, recycling the desorbent and taking the desorbent as the desorbent of a next batch and separating malachite green solids out from residual liquid at the bottom of a kettle so as to recycle the malachite green; and taking the desorption solution containing low-concentration malachite green as a starting desorbent of the desorbent of the next batch. The malachite green wastewater treated by the method has the removing rate of the malachite green approximate to 100 percent, and desorption rate of the malachite green over 97 percent. In respect of the treatment on the malachite green wastewater and the purification of low-concentration malachite green water bodies, the method is of greater application value.

Description

technical field [0001] The invention belongs to the field of dye wastewater treatment, and more specifically, adopts activated carbon fiber to adsorb and treat malachite green wastewater, adopts a suitable desorbent to desorb the activated carbon fiber, and utilizes distillation of high-concentration desorption liquid to recover malachite green and desorb. Additive method. Background technique [0002] Malachite Green (MG), also known as alkaline green or malachite green, is a green crystal with metallic luster. As an industrial dye, malachite green is used in pottery, textile, leather and cytochemical dyeing; because of its antibacterial and insecticidal effects, it is also often used as a fungicide. Malachite green has high toxicity, high residue and carcinogenic, teratogenic and mutagenic effects, which seriously threaten human health. In view of the harmfulness of malachite green, many countries have listed malachite green as a banned drug in aquaculture, and Canada ba...

Claims

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Application Information

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IPC IPC(8): C02F9/04C09B23/16C02F1/66C02F1/28
Inventor 唐登勇郑有飞郭照冰金文杰曹蓉邵禹董超王晓兰潘婷陆海
Owner NANJING UNIV OF INFORMATION SCI & TECH
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