Simultaneous phosphorus and nitrogen removal light material, preparation method and application thereof

A technology for simultaneous denitrification and dephosphorization, lightweight materials, applied in separation methods, chemical instruments and methods, water treatment parameter control, etc. problems, to achieve the effect of improving the overall denitrification rate, high reactivity and large specific surface area

Pending Publication Date: 2019-08-02
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Aiming at the problems existing in the existing sewage treatment technology such as large particle size of reductive sulfide filler, small specific surface area and low denitrification rate, the present invention provides a lightweight material for synchronous denitrification and dephosphorization. Components are highly fused, where iron-based components are pyrite and calcium-magnesium carbonate mixtures or pyrite; and are foamed to form lightweight materials

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  • Simultaneous phosphorus and nitrogen removal light material, preparation method and application thereof
  • Simultaneous phosphorus and nitrogen removal light material, preparation method and application thereof
  • Simultaneous phosphorus and nitrogen removal light material, preparation method and application thereof

Examples

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Embodiment 1

[0060] In this embodiment, sulfur with a mass ratio of 6:1 is mixed with an iron-based component to obtain a mixture, wherein the iron-based component is pyrite. In the specific mixing process, weigh 95% of the mass of pyrite and mix it with all the sulfur to obtain a mixture; heat the mixture to 140°C for high-temperature melting, and continuously stir the molten mixture until it melts during the melting process There are no lumps or granular substances in the mixture, the color of the molten mixture is uniform and stable, and a uniform molten mixture is obtained.

[0061] For this embodiment, the above molten mixture is subjected to foaming treatment by means of chemical foaming. The chemical foaming agent added is sodium bicarbonate, and the mass ratio of sulfur, pyrite and sodium bicarbonate is 300:50:2. Mix the remaining 5% of pyrite and sodium bicarbonate, then add the mixture of pyrite and sodium bicarbonate to the above molten mixture, continuously mechanically stir t...

Embodiment 2

[0063] The basic content of this example is the same as that of Example 1, except that the mass ratio of sulfur to iron-based components in this example is 1:2, and the iron-based component is pyrite. The sulfur and the pyrite are mixed to obtain a mixture, and the mixture is heated to 140° C. for high-temperature melting to obtain a molten mixture.

[0064] For this embodiment, since the obtained molten mixture has a relatively high viscosity, the above molten mixture is subjected to foaming treatment by means of physical foaming. Under the condition of physical aeration, nitrogen is blown into the above molten mixture to foam the pyrite and sulfur molten mixture, wherein the nitrogen flow rate is 80mL / min, and the blowing time is 15 minutes. During the foaming process, the molten mixture is mechanically stirred continuously, the stirring speed is 500-600rpm, and the stirring time is 60 minutes, so that the bubbles are evenly dispersed in the molten mixture, and the stirring ...

Embodiment 3

[0066] The basic content of this embodiment is the same as that of Example 1, except that the mass ratio of sulfur and iron-based components in this embodiment is 1:1, wherein the iron-based components are pyrite and calcium-magnesium carbonate, And the mass ratio of pyrite to calcium magnesium carbonate is 1:2. The sulfur is mixed with pyrite and calcium magnesium carbonate to obtain a mixture, and the mixture is heated to 160° C. for high-temperature melting to obtain a molten mixture.

[0067] The above molten mixture is subjected to chemical foaming treatment by adding chemical foaming agent sodium bicarbonate. The mass ratio of sulfur, pyrite, calcium magnesium carbonate and blowing agent is 300:300:5. During the foaming process, the molten mixture is continuously magnetically stirred, the stirring speed is 50-100rpm, and the stirring time is 5 minutes, so that the bubbles are evenly dispersed in the molten mixture; finally cooled and formed to prepare a lightweight mate...

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Abstract

The invention discloses a simultaneous phosphorus and nitrogen removal light material, a preparation method and the application thereof, and belongs to the technical field of environment function materials and sewage disposal. A fusion mixture is obtained by sufficiently fusing and dispersing sulfur and an iron-based component, wherein the iron-based component is a pyrite and calcium magnesium carbonate mixture; and foaming treatment is carried out on the fusion mixture to form the simultaneous phosphorus and nitrogen removal light material. The simultaneous phosphorus and nitrogen removal light material disclosed by the invention has the characteristics of high porosity, large specific surface area, light weight and high reaction activity. The obtained light material, as a microbial carrier and an electron donor of biochemical reactions, is applied to the reactors, such as fixed beds and fluidized beds, for sewage disposal, and has the advantages of good microorganism adhesion property, high denitrification speed and good phosphorous removal effect.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials and sewage treatment, and more specifically relates to a lightweight material for simultaneous denitrification and phosphorus removal and its preparation and application method. Background technique [0002] In recent years, the country's rapid economic development and accelerated urbanization have resulted in more and more eutrophication of water bodies, and the main cause of eutrophication in water bodies is the excessive nitrogen and phosphorus elements in water bodies. Therefore, the advanced treatment of nitrogen and phosphorus in sewage has become the focus of environmental protection. [0003] At present, biological methods are mainly used for sewage treatment, which are widely used because of their low cost. Autotrophic and heterotrophic denitrification technologies are widely used in the removal of nitrogen in sewage, and chemical phosphorus removal is the most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/28
CPCC02F3/2806C02F3/34C02F2003/001C02F2209/15C02F2209/18B01D39/2093B01D2239/10C02F3/2833C02F3/305C02F2101/105C02F2101/16C02F2103/06B01D39/2051B01D2257/102B01D2257/55
Inventor 李睿华沈思文周立松罗黎煜关梦莎王卫葛志斌
Owner NANJING UNIV
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