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Cr(VI) wastewater treatment method

A technology for wastewater treatment and wastewater, which is applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, and other chemical processes to achieve the effects of low requirements for adsorption conditions, high adsorption efficiency and low cost

Inactive Publication Date: 2016-11-23
XIAMEN UNIV TAN KAH KEE COLLEGE
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] The effect of using sawdust and peanut shells to treat Cr(III) is better, and it is a method worth promoting (Zhou Jun, Zhai Jianping, Lv Huifeng, etc. Sawdust and peanut shells adsorb and remove Cr(III) in aqueous solution 3+ Environmental Pollution Control Technology and Equipment. 2006,7(1):122-125.), but the application of modified peanut shells and modified sawdust to the adsorption and removal of Cr(VI) in wastewater has not been seen. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030](1) Weigh 5g of peanut shells and place them in a 1L beaker, add 100mL of 1mol / L phosphoric acid solution, stir for 60min, then use a suction filter pump to remove the liquid part, dry at 50°C, and then heat up to 180°C Heating for 60 minutes, then activating in a muffle furnace at 500°C for 60 minutes, washing with 75°C deionized water to remove free phosphoric acid, then drying at 50°C and cooling to obtain phosphoric acid-modified peanut shells;

[0031] (2) Weigh 5g of sawdust and place it in a 1L beaker, mix phosphoric acid and sawdust at a ratio of 2:1, stir evenly, let it stand for 5 minutes to allow it to fully impregnate and swell, and then place it in an oven at 120-150°C to dry and solidify for 60 minutes. Stir once every 15 minutes. Then place it in a muffle furnace for activation at 500°C for 60 minutes. After the activation, pickle first, then wash with water until the rinsing solution is neutral, and then place it in a drying oven at 50°C to dry and cool t...

Embodiment 2

[0034] Get 100mL concentration and place the Cr(VI) solution of 10mg / L in a 250mL conical flask with a stopper, accurately weigh 0.3g of the composite adsorbent prepared in Example 1 and add it to the Cr(VI) solution. The mass ratios of permanent peanut shells and modified wood chips are 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, respectively. Place in a constant temperature oscillator, shake at a rate of 100 r / min at 25°C, take the supernatant after 60 min, and test the absorbance of residual Cr(VI) by the diphenylcarbazide method. After calculation, the removal rates of Cr(VI) were 50.79%, 51.19%, 58.13%, 57.14%, 58.53%, 59.72%, 63.29%.

[0035] Such as figure 1 As shown, when the mass ratio of modified peanut shells and modified wood chips is 1:1-1:2, the removal rate increases slowly. When the mass ratio of modified peanut shells and modified wood chips is 1:2-1:4, the removal rate Overall tends to be stable. Therefore, the dosage ratio is preferably 1:2 to 1:4, and 1:3.5...

Embodiment 3

[0037] Take 100mL of 10mg / L Cr(VI) solution in a 250mL Erlenmeyer flask with a stopper, accurately weigh 0.3g of the composite adsorbent prepared in Example 1 and add it to the Cr(VI) solution, place it in a constant temperature oscillator, Oscillate at a rate of 100r / min at the temperature, take the supernatant after 20, 40, 60, 80, 100, and 120 min respectively, and test the absorbance of residual Cr(VI) by the diphenylcarbazide method. After calculation, the removal rates of Cr(VI) were 51.67%, 59.66%, 63.38%, 65.99%, 67.84%, 67.10%, respectively.

[0038] Such as figure 2 As shown, the longer the adsorption time is, the better the removal effect is, and the removal rate is faster at 20-40 minutes. After 40 minutes, the removal rate tends to be stable and reaches 100 minutes. The removal rate of Cr(VI) in wastewater is the highest, and the removal rate reaches 120 minutes. Decrease, so the optimum adsorption time is 100min, so the adsorption time range is preferably 40-10...

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Abstract

The invention discloses a Cr(VI) wastewater treatment method. The method includes the following steps that 1, phosphoric acid modified peanut shells are prepared; 2, phosphoric acid modified wood bits are prepared; 3, the phosphoric acid modified peanut shells prepared in the step 1 and the phosphoric acid modified wood bits prepared in the step 2 are mixed by the mass ratio of 1:(1-4) to prepare composite adsorbent; 4, the composite adsorbent is put into Cr(VI) wastewater according to the amount of 0.1-0.7 g / 100 mL, oscillation adsorption is carried out for 20-120 min at the speed of 40-140 r / min and the temperature of 25-65 DEG C, and the pH value of the Cr(VI) wastewater is 1-12. The phosphoric acid modified peanut shells and the phosphoric acid modified wood bits are mixed to treat the wastewater contaminated by Cr(VI), the efficiency of Cr(VI) adsorption is high, the operation process is simple, the adsorption condition requirement is low, the adsorption material is low in cost, and the purpose of treating pollution by waste is achieved.

Description

technical field [0001] The invention belongs to the field of Cr(VI)-containing wastewater treatment, and in particular relates to a Cr(VI) wastewater treatment method. Background technique [0002] Cr(VI) is chromium in the form of chromates and dichromates. It is soluble in water, stable in water, and can be reduced to Cr(III) under anaerobic conditions. It is an extremely toxic substance for inhalation. Cr(VI) is often used as chromic acid in the electrochemical industry, and it is also used as a colorant in pigments and in cooling water circulation systems, such as preservatives in refrigerator heat exchangers. In the galvanizing industry, Cr(VI) is used in the post-plating passivation treatment of galvanized sheets to increase the durability of galvanized sheets against corrosion. At present, Cr(VI) is widely used in industry, mainly in a series of industries such as metal processing, electroplating, tanning, light industry and textile. Therefore, a large amount of ch...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/24B01J20/32
Inventor 廖颖敏刘辉峡詹子婷黄嘉达余明翔卓晓菲游丽娟黄金阳
Owner XIAMEN UNIV TAN KAH KEE COLLEGE
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