Reclaimed water deep denitrification and dephosphorization method based on low C/N ratio

A technology for deep denitrification and water regeneration, applied in the field of environmental engineering, can solve the problems of limited carbon content in corn cob, inability to ensure denitrification and denitrification effect, and difficulty in achieving phosphorus removal, etc., and achieves the /N ratio of tail water deep denitrification synchronization. Improved effect of phosphorus removal

Inactive Publication Date: 2016-08-10
BEIJING UNIV OF TECH
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Problems solved by technology

However, the carbon content inside the corn cob is limited, which cannot guarantee the effect of continuous and efficient denitri

Method used

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  • Reclaimed water deep denitrification and dephosphorization method based on low C/N ratio
  • Reclaimed water deep denitrification and dephosphorization method based on low C/N ratio
  • Reclaimed water deep denitrification and dephosphorization method based on low C/N ratio

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Embodiment

[0026] Test water Add a certain amount of KNO to tap water 3 and KH 2 PO 4 . Control the concentration of TN and TP as follows: ρ(TN)=ρ(NO 3 -N)=35mg.L -1 , ρ(H 2 PO 4 -P)=1.5mg.L -1 . At the same time with 1mol L -1 of hydrochloric acid and 1mol·L -1 Sodium hydroxide solution is used to adjust the pH value of the distribution water to maintain it at 6.8-7.2.

[0027] The reactor is attached figure 1 shown. Among them, the corncob is soaked in NaOH solution with a mass fraction of 1.5% for 10 hours, cut into small rectangles with a length of 2 to 3 cm and a width of 1 to 2 cm; the particle diameter of the sponge iron is 5 to 8 mm, and the particle diameter of the sulfur is 2 to 2 cm. 3mm. The inoculum sludge came from the return sludge of a sewage treatment plant in Beijing.

[0028] In the above implementation mode, the SCSC-S-Fe process is applied to the deep nitrogen and phosphorus removal process of the tail water of the urban sewage treatment plant to enhanc...

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Abstract

A reclaimed water deep denitrification and dephosphorization method based on low C/N ratio belongs to the technical field of environmental engineering. A process for composing solid cellulose carbon-sourced ferrous sulfide by coupling sulfur and sponge iron composite through alkali-treated corncobs is simplified as SCSC-S-Fe process. An SCSC-S-Fe process system relies mainly on heterotrophic denitrification to remove nitrogen in water in coordination with sulfur autotrophic denitrification and sponge iron denitrification; in this system, mainly sulfur and sponge iron are chemically reacted to generate FeS, FeS combines with other products generated by sponge iron corrosion such as Fe2+, Fe3+, F36(OH)12(CO3) and FeOOH to convert PO43- into Fe3(PO4)2.xH2O, FePO4 and Fe3(PO4)2(OH)2 precipitates by adsorption precipitation, thus removing phosphorus; the SCSC-S-Fe process is effective in improving reclaimed water deep denitrification and dephosphorization effect at low C/N ratio. The method has a promising application prospect in high-quality reclaimed water treatment.

Description

technical field [0001] The invention relates to a method suitable for deep denitrification and dephosphorization of regenerated water with a low C / N ratio, based on a solid-phase cellulose carbon source corncob coupled with sulfur-iron composite filler to strengthen deep denitrification and dephosphorization, which belongs to the technical field of environmental engineering. Background technique [0002] The urban water resource crisis plagues the harmonious development of the city, and the reuse of reclaimed water is an inevitable way to solve the water resource crisis. Limited by the treatment technology of the existing sewage treatment plant, the effluent of the traditional biological nitrogen and phosphorus removal process still contains a certain concentration of nitrogen and phosphorus. Studies have shown that nitrogen and phosphorus are the controlling factors of eutrophication in most water bodies. For closed waters such as lakes and reservoirs, when the total inorg...

Claims

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Application Information

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IPC IPC(8): C02F3/28
CPCC02F3/28C02F2305/06
Inventor 郝瑞霞范军辉朱晓霞万京京李萌
Owner BEIJING UNIV OF TECH
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