Deep processing method of wastewater during production of diclofenac

A technology for the production of wastewater and diclofenac, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of not taking into account the recovery of diclofenac resources and the limited effect of diclofenac adsorption and removal, etc. Achieve the effect of improving the flocculation effect, making the flocs larger and reducing the pollution load

Inactive Publication Date: 2013-07-10
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used adsorption materials include silica, resin, natural zeolite, etc., but the adsorption and removal effect on diclofenac is limited, and the above-mentioned process does not take the recovery of diclofenac resources into consideration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Filter the diclofenac production wastewater, add dilute HCl and NaOH to adjust the pH to 5~6; the COD of the wastewater is 9200mg / L. The waste water flows through the adsorption reaction tank, and it is adsorbed under the condition of 25±5°C with the embedded iron oxide resin material as the adsorption material. The solid dosage is 2000mg / L, and the adsorption reaction time is 20min; In the flocculation treatment unit, add cationic flocculant PAC at a concentration of 0.3g / L, stir rapidly at a speed of 300r / min for 3min, and then stir slowly at a speed of 40r / min for 10min. After the flocs settle, the effluent is analyzed and tested. After being treated by this method, the chromaticity of the effluent is significantly reduced, the effluent is colorless and transparent, and the COD Cr down to 715mg / L.

[0022] The adsorbed material after flocculation and precipitation is eluted with 7% NaOH solution, 3% NaOH solution and water at 30±5°C, and the desorption hydraulic re...

Embodiment 2

[0024] Taking the raw water of biochemical wastewater from a diclofenac sodium production plant in China as an example, the experiment was carried out. The water quality is shown in Table 2. After the raw wastewater is filtered, dilute HCl and NaOH solutions are added to adjust the pH to be in the range of 6-7. At a temperature of 25±5°C, nanometer iron oxyhydroxide (α-FeOOH) was used as the adsorbent, the dosage was 1500mg / L, and the hydraulic retention time was 20min. After adsorption balance, enter the flocculation treatment unit, add cationic PAC at a concentration of 0.3g / L, stir rapidly at a speed of 300r / min for 3min, and then stir slowly at a speed of 40r / min for 10min. After flocculation and sedimentation, the α-FeOOH was desorbed and regenerated with 4% NaOH solution and tap water at 25°C for 15 minutes for the adsorption material nano-iron oxyhydroxide.

[0025] After treatment, the TOC of the raw wastewater dropped from 5200mg / L to 240mg / L, and the COD cr From 1...

Embodiment 3

[0029] Taking the diclofenac production wastewater after biochemical treatment as an example, the experiment was carried out. The water quality is shown in Table 1. After the raw wastewater is filtered, dilute HCl and NaOH solutions are added to adjust the pH to be in the range of 5-6. Under the condition of temperature 25±5℃, the embedded iron oxide resin material is used as the adsorbent, the dosage is 3000mg / L, and the hydraulic retention time is 40min. After adsorption balance, enter the flocculation treatment unit, add cationic PAM at a concentration of 0.5g / L, stir rapidly at a speed of 300r / min for 3min, and then stir slowly at a speed of 40r / min for 10min. After flocculation and sedimentation, the embedded iron oxide resin material was desorbed and regenerated with 4% NaOH solution and tap water at 30°C for 30 minutes. After treatment, the TOC of the wastewater dropped from 420mg / L to 45mg / L, and the COD cr From 1100mg / L to 115mg / L. According to the secondary stand...

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Abstract

The invention discloses a deep processing method of wastewater during production of diclofenac. The deep processing method comprises the following steps of: pretreating (filtering and pH adjusting) wastewater during production of diclofenac, and forming a adsorbing gradient fluidized bed in an adsorption reaction tank by adopting an adsorption nanomaterial, so that organic matters in the wastewater during production of the diclofenac are adsorbed onto the nanomaterial; and adding a high polymer composite flocculant to carry out reinforced flocculation after the absorption is balanced, so that the nanomaterial forms a floc so as to achieve solid-liquid separation after precipitation, wherein the absorption nanomaterial is recycled after being regenerated through salt and alkali desorption. The COD (Chemical Oxygen Demand) Cr of the wastewater, during production of the diclofenac, treated by the deep processing method, can be reduced to be below 2000mg / L, the CODCr removal rate is more than 85 percent, and the vast majority of resources in the wastewater can be recycled. According to the deep processing method, wastewater processing and resource recycling can be synchronously carried out, and remarkable economical, social and environment benefits can be achieved.

Description

technical field [0001] The invention relates to a typical medicine and personal care product—a wastewater treatment and resource recovery method produced in the production process of diclofenac, in particular, an advanced treatment method for diclofenac production wastewater. Background technique [0002] In recent years, with the large-scale development of the pharmaceutical and cleaning industries, the production and use of pharmaceuticals and personal care products (PPCPs) have increased rapidly, and their abuse has led to long-term pollution of drinking water sources by organic substances; most of these organic substances are difficult to chemically oxidize , Refractory biodegradable substances, but also carcinogens or endocrine disruptors, bringing potential harm to the ecological environment and human health. At present, there are more than 80 types of drugs and personal care products of different types and concentrations detected in surface water, ground water, drinki...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/38
Inventor 田秉晖国小伟李晓琳辛丽花
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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