Ortho-aminophenol wastewater advanced treatment method

Abstract

The invention discloses a chemical treatment method, in particular to an ortho-aminophenol wastewater advanced treatment or recycling method. The method includes: using a single-chamber reactor consisting of a three-dimensional electrode system for advanced treatment of ortho-aminophenol wastewater by means of an electrochemical oxidation method, wherein the single-chamber reactor is formed by using a DSA (dimensionally stable anode) electrode as an anode material, using a stainless steel plate equal to the DSA electrode in size as a cathode, and filling a gamma-Al2O3 loaded manganese oxide used as a particle electrode between electrode plates, and the electrode spacing is 1cm; electrolyzing for more than 10min in the reactor, wherein current density is 30-70mA cm<-2>, and pH ranges from 3 to 11; and adding MnO2 / gamma- Al2O3 particle electrode materials according the solution mass ratio of 0.5-5.0wt%. The ortho-aminophenol wastewater advanced treatment or recycling method has the advantages of high oxidizability, high removal efficiency, environment friendliness and the like and has wide usage.

Description

technical field

[0001] The invention relates to a chemical treatment method, specifically a method for advanced treatment or reuse of o-aminophenol wastewater, which is suitable for advanced treatment or reuse of o-aminophenol tail water after biochemical-physicochemical treatment. technical background

[0002] Ortho-aminophenol (OPA), a typical aromatic amphoteric compound, is an important chemical intermediate widely used in the fields of dyes, medicine, printing and biology. The wastewater discharged from the production process of o-aminophenol has high toxicity, poor biodegradability, and serious environmental pollution. Because of its high toxicity, it is listed in the forefront of the list of "the world's environmental priority control of toxic organic pollutants", and its diffusion in the environment must be reduced.

[0003] At present, the treatment rate and qualification rate of o-aminophenol production wastewater are very low, so the task of treatment is very ard...

Examples

Embodiment 1

[0018] Use a 200mL beaker to measure 100mL of o-aminophenol wastewater, and the COD is 1168.6mg L -1 , pH is 6.8 (pH of original water sample), add 2wt% carrier γ-Al 2 o 3 , Stir the solution with a magnetic stirrer, take samples from the reactor for 10 minutes and 20 minutes to measure the COD value, the removal rates of COD are 23.5% and 23.72% respectively, it can be known from the results that the carrier γ -Al 2 o 3 It only has adsorption performance, and the adsorption effect is poor.

Embodiment 2

[0020] Use a 200mL beaker to measure 100mL of o-aminophenol wastewater, and the COD is 1168.6mg L -1 , pH is 6.8 (original water sample pH), add 2wt% catalyst MnO 2 / γ-Al 2 o 3 , Stir the solution with a magnetic stirrer, and take a sample from the reactor to measure the COD value after 10 minutes. The removal rate of COD is 49.5%. It can be seen from the results that the catalyst MnO 2 / γ-Al 2 o 3 It has a certain catalytic effect at normal temperature and pressure.

Embodiment 3

[0022] Two 2×5cm DSA electrodes are used as anodes, and the anode electrode material is Ti / Sb-SnO 2 / PbO 2 , is to coat the middle layer Sb-SnO by pyrolysis method on titanium mesh 2 , electrodeposited active layer PbO 2 . In addition, a stainless steel sheet of the same size is used as the cathode, and the distance between the electrodes is 1cm, and the electrochemical oxidation is advanced to treat o-aminophenol wastewater, and the COD is 1168.6mg L -1 , pH were 3, 5, 7, 9, 11 and 13 respectively, adding 1.0wt% Na 2 SO 4 Supporting electrolyte with a current density of 50mA cm -2 , the reaction lasted 70 minutes. In the experimental results, we found that their corresponding COD removal rates were 74.1%, 87.1%, 89.1%, 91.2% and 60.1%, respectively. It can be seen from the results that, without adding any catalyst, pure electrochemical technology treats ortho-aminophenol wastewater, and when the pH = 10.5, the COD removal rate reaches the highest 92.5%, so the optimal...

technical field

[0001] The invention relates to a chemical treatment method, specifically a method for advanced treatment or reuse of o-aminophenol wastewater, which is suitable for advanced treatment or reuse of o-aminophenol tail water after biochemical-physicochemical treatment. technical background

[0002] Ortho-aminophenol (OPA), a typical aromatic amphoteric compound, is an important chemical intermediate widely used in the fields of dyes, medicine, printing and biology. The wastewater discharged from the production process of o-aminophenol has high toxicity, poor biodegradability, and serious environmental pollution. Because of its high toxicity, it is listed in the forefront of the list of "the world's environmental priority control of toxic organic pollutants", and its diffusion in the environment must be reduced.

[0003] At present, the treatment rate and qualification rate of o-aminophenol production wastewater are very low, so the task of treatment is very ard...

Examples

Embodiment 1

[0018] Use a 200mL beaker to measure 100mL of o-aminophenol wastewater, and the COD is 1168.6mg L -1 , pH is 6.8 (pH of original water sample), add 2wt% carrier γ-Al 2 o 3 , Stir the solution with a magnetic stirrer, take samples from the reactor for 10 minutes and 20 minutes to measure the COD value, the removal rates of COD are 23.5% and 23.72% respectively, it can be known from the results that the carrier γ -Al 2 o 3 It only has adsorption performance, and the adsorption effect is poor.

Embodiment 2

[0020] Use a 200mL beaker to measure 100mL of o-aminophenol wastewater, and the COD is 1168.6mg L -1 , pH is 6.8 (original water sample pH), add 2wt% catalyst MnO 2 / γ-Al 2 o 3 , Stir the solution with a magnetic stirrer, and take a sample from the reactor to measure the COD value after 10 minutes. The removal rate of COD is 49.5%. It can be seen from the results that the catalyst MnO 2 / γ-Al 2 o 3 It has a certain catalytic effect at normal temperature and pressure.

Embodiment 3

[0022] Two 2×5cm DSA electrodes are used as anodes, and the anode electrode material is Ti / Sb-SnO 2 / PbO 2 , is to coat the middle layer Sb-SnO by pyrolysis method on titanium mesh 2 , electrodeposited active layer PbO 2 . In addition, a stainless steel sheet of the same size is used as the cathode, and the distance between the electrodes is 1cm, and the electrochemical oxidation is advanced to treat o-aminophenol wastewater, and the COD is 1168.6mg L -1 , pH were 3, 5, 7, 9, 11 and 13 respectively, adding 1.0wt% Na 2 SO 4 Supporting electrolyte with a current density of 50mA cm -2 , the reaction lasted 70 minutes. In the experimental results, we found that their corresponding COD removal rates were 74.1%, 87.1%, 89.1%, 91.2% and 60.1%, respectively. It can be seen from the results that, without adding any catalyst, pure electrochemical technology treats ortho-aminophenol wastewater, and when the pH = 10.5, the COD removal rate reaches the highest 92.5%, so the optimal...