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Short-process nitrification cooperated As(III) oxidization method

A short-range nitrification and synergistic oxidation technology, applied in the field of environmental engineering, can solve the problems of slow direct oxidation, high cost, easy introduction of impurities, etc., achieve the effect of ammonia oxidation and arsenic detoxification, and reduce the cost of wastewater treatment

Active Publication Date: 2018-02-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The oxidation of arsenic is divided into direct oxidation and catalytic oxidation. Direct oxidation is very slow, while catalytic oxidation is costly and easy to introduce impurities.

Method used

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Examples

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Effect test

Embodiment 1

[0025] A laboratory-scale (volume 5L) SHARON reactor was used to cultivate short-path nitrification sludge with high-efficiency denitrification. The strategy is as follows: Control matrix NH in influent simulated wastewater 4 + -N concentration is at a higher level, and the hydraulic retention time (HRT) is gradually shortened to increase the volume load of the short-path nitrification reactor. Ultimate: Influent NH 4 + -N concentration increased from 200mg / L to 300mg / L, HRT shortened from 2d to 0.5d, volumetric nitrogen load from 0.3kg / m 3 / d increased to 0.48kg / m 3 / d. In order to obtain short-range nitrification sludge with high efficiency denitrification, its specific physical and chemical characteristics include: SNA reaches 1.57mg N / g VSS / h, sludge particle size (D50) is higher than 90um, VSS is 3.792g / L, VSS / SS is 0.7-0.88, pH 7.5-8.5, temperature 30-35°C.

Embodiment 2

[0027]In this example, according to the strategy of Example 1, short-range nitrification sludge with high efficiency denitrification is cultivated, and at the same time, NaAsO 2 Prepare 250mL solution containing As(III) with a concentration of 5mg / L, as the reaction substrate water of the short-range nitrification system, the flocculent sludge concentration VSS is 3.792g / L, and the NH 4 + -N concentration is 300mg / L, adjust pH with NaOH solution, control pH at 7.5-8.5, measure DO with dissolved oxygen analyzer, control it at 1.0-1.5, and control temperature at 30-35°C. The reaction was carried out for 8 hours under magnetic stirring, and the water sample was measured by LC-ICP-MS after 8 hours, and As(III) was completely removed.

Embodiment 3

[0029] The sludge obtained after embodiment 2 was operated for 5 days, with NaAsO 2 Prepare 250mL solution containing As(III) concentration of 15mg / L as the reaction matrix of the short-range nitrification system and impact it with water. The flocculent sludge concentration VSS is 3.792g / L, and the NH 4 + -N concentration is 300mg / L, adjust pH with NaOH solution, control pH at 7.5-8.5, measure DO with dissolved oxygen analyzer, control it at 1.0-1.5, and control temperature at 30-35°C. The reaction was performed under magnetic stirring for 8 hours, and the water sample was measured by LC-ICP-MS after 8 hours, and As(III) was completely removed.

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Abstract

The invention discloses a short-process nitrification cooperated As(III) oxidization method. According to the method, firstly, the temperature of a short-process nitrification system is controlled tobe 30 to 35 DEG C; the pH is 7.5 to 8.5; the DO is 1.0 to 1.5mg / L; by gradually improving the ammonia nitrogen load and shortening the hydraulic retention time, the short-process nitrification sludgewith good sedimentation performance is obtained through culture; then, a short-process nitrification reactor is subjected to As(III) gradient concentration impact; through resistance culture, the short-process nitrification sludge capable of realizing the cooperated As(III) oxidization is enriched and cultured; the biological nitrification cooperated As(III) oxidization system is built; during thewaste water nitrification, the arsenic detoxification is realized. The ammoxidation and arsenic detoxification can be realized in one step; the waste water nitrification treatment cost is reduced; the inhibition of arsenic on biological denitrification is relieved; the efficient nitrification is realized.

Description

technical field [0001] The invention relates to a method for short-range nitrification and co-oxidation of As(III), in particular to the treatment of As(III)-containing ammonia nitrogen wastewater produced in the process of metal smelting, and belongs to the field of environmental engineering. Background technique [0002] The eutrophication of water bodies caused by nitrogen pollution in my country is very serious. Nitrogen pollution has endangered the healthy development of many industries such as fishery, agriculture, and tourism, and has posed a serious threat to people's drinking water safety; nitrogen entering the water body is harmful to humans and Nature is the worst hazard. The ammonia nitrogen wastewater generated in the specific production process has complex components, and the ammonia nitrogen wastewater generated in the metal smelting process generally contains high concentrations of heavy metal ions. For example, tungsten smelting wastewater contains high co...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F101/16C02F101/20C02F103/16
CPCC02F3/1231C02F2101/103C02F2101/16C02F2101/20C02F2103/16Y02W10/10
Inventor 唐崇俭段程珊柴立元闵小波刘鹏张林王海鹰杨志辉
Owner CENT SOUTH UNIV
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