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Adsorbent, preparation process thereof and application of adsorbent to purification of ammonia-nitrogen wastewater with medium-low concentration

A technology of ammonia nitrogen wastewater and preparation process, which is applied in the direction of adsorption of water/sewage treatment, other chemical processes, water pollutants, etc., can solve the problems of high regeneration cost, short service life and high operating cost of adsorbents, and achieve cheap raw materials and reunion The effect of light degree and fast settlement speed

Inactive Publication Date: 2013-08-21
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional adsorption method mostly uses adsorbents such as activated carbon and activated carbon fiber, which have good treatment effects, but their service life is short, the operating cost is high, and the regeneration cost of the adsorbent is high, which limits its application.

Method used

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  • Adsorbent, preparation process thereof and application of adsorbent to purification of ammonia-nitrogen wastewater with medium-low concentration
  • Adsorbent, preparation process thereof and application of adsorbent to purification of ammonia-nitrogen wastewater with medium-low concentration
  • Adsorbent, preparation process thereof and application of adsorbent to purification of ammonia-nitrogen wastewater with medium-low concentration

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The mass percentage of sawdust is 99.7%, Fe(OH) 3 The mass percentage is 0.3%.

[0037] Preparation of iron-plated sawdust: the mass percentage of sawdust particles with a particle size of 198-350 μm accounts for 81%, and the concentration of FeCl is 0.15 mol / L 3 The Fe(OH) produced by the reaction of the solution with the NaOH solution 3 suspension, then wood chips and Fe(OH) 3 After the suspension was fully mixed with a solid-to-liquid ratio of 1.0 g / 10 mL, it was hydrothermally treated at a temperature of 40 °C for 2 h, and the product was washed to neutral, filtered with suction, and dried to obtain the iron-plated sawdust adsorbent.

[0038] Purification and treatment of ammonia nitrogen wastewater by iron-plated sawdust adsorbent: initial NH in wastewater 4 + The concentrations of -N and COD were 102 mg / L and 355 mg / L respectively, the reaction temperature was controlled at 25°C, the pH of the wastewater was adjusted to 9, the amount of iron-plated sawdust ads...

Embodiment 2

[0040] The mass percentage of sawdust is 99.4%, Fe(OH) 3 The mass percentage is 0.6%.

[0041] Preparation of iron-plated sawdust: the mass percentage of sawdust particles with a particle size of 198-350 μm accounts for 85%, and the concentration of FeCl is 0.20 mol / L 3 The Fe(OH) produced by the reaction of the solution with the NaOH solution 3 suspension, then wood chips and Fe(OH) 3 After the suspension was fully mixed at a solid-to-liquid ratio of 0.8 g / 10 mL, it was hydrothermally treated at a temperature of 30 °C for 3 h, and the product was washed to neutrality, filtered with suction, and dried to obtain the iron-plated sawdust adsorbent.

[0042] Purification and treatment of ammonia nitrogen wastewater by iron-plated sawdust adsorbent: initial NH in wastewater 4 + -N, Zn 2+ The concentrations were 94 mg / L and 4.5 mg / L respectively, the reaction temperature was controlled at 35°C, the pH of the wastewater was adjusted to 10, the amount of adsorbent was 3.5 g / L, an...

Embodiment 3

[0044] The mass percentage of sawdust is 99.4%, Fe(OH) 3 The mass percentage is 0.6%.

[0045] Preparation of iron-plated sawdust: the mass percentage of sawdust particles with a particle size of 198-350 μm accounts for 85%, and the concentration of FeCl is 0.20 mol / L 3 The Fe(OH) produced by the reaction of the solution with the NaOH solution 3 suspension, then wood chips and Fe(OH) 3 After the suspension was fully mixed at a solid-to-liquid ratio of 0.8 g / 10 mL, it was hydrothermally treated at a temperature of 50 °C for 1.5 h. The product was washed to neutrality, filtered with suction, and dried to obtain the iron-plated sawdust adsorbent.

[0046] Purification and treatment of ammonia nitrogen wastewater by iron-plated sawdust adsorbent: initial NH in wastewater 4 + -N, AsO 4 3- The concentrations were 147 mg / L and 0.9 mg / L respectively, the reaction temperature was controlled at 28°C, the pH of the wastewater was adjusted to 9, the amount of adsorbent was 4.8 g / L, ...

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Abstract

The invention relates to a technology for purifying and treating ammonia-nitrogen wastewater by using an adsorption method and particularly relates to an adsorbent, a preparation process thereof and an application of the adsorbent to the purification of ammonia-nitrogen wastewater with medium-low concentration. An iron-plated woodchip adsorbent provided by the invention is composed of woodchips and Fe(OH)3. The preparation process comprises the following steps of: washing woodchips by using water for 1-3 times to remove impurities, drying, crushing and screening to ensure that the mass percentage of the woodchips with the particle sizes of 198-350mum is larger than or equal to 80%; subjecting a FeCl3 solution with the concentration of 0.15-0.25mol / L and a NaOH solution to reaction to generate a Fe(OH)3 suspension liquid; and then, sufficiently mixing the screened woodchips and the Fe(OH)3 suspension liquid according to the solid-to-liquid ratio of 0.6-1.0g / 10mL, carrying out hydrothermal treatment at the temperature of 30-50 DEG C for 1.5-3h, washing a product by using water until the product is neutral, carrying out suction filtration, and drying the product. When the adsorbent is used for purifying the ammonia-nitrogen wastewater with medium-low concentration, the removal rate of NH4<+>-N is larger than or equal to 90%, and the removal rate of COD (Dissolved Organic Carbon) is larger than or equal to 75%.

Description

technical field [0001] The invention relates to a technology for purifying and treating ammonia nitrogen wastewater by adsorption method, in particular to an adsorbent and a preparation process thereof which are applied to purify medium and low concentration ammonia nitrogen wastewater. Background technique [0002] With the development of the economy and the continuous improvement of people's living standards, the pollution caused by ammonia nitrogen wastewater from a wide range of sources and increasing discharge has attracted global attention. In addition to petroleum, chemical, fertilizer, steel, food, pharmaceutical and other industries producing a large amount of wastewater, the decomposition of nitrogen-containing organic matter in domestic sewage, animal excretion, landfill leachate and the use of nitrogen fertilizers in agricultural production will also produce ammonia nitrogen pollution. After the ammonia nitrogen enters the water body, the most obvious thing is to...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/38
Inventor 陈云嫩
Owner JIANGXI UNIV OF SCI & TECH
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