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Alkalinity regulation and control method based on deep nitrogen removal of sulfur autotrophic denitrification filter

A technology of denitrification filter and deep denitrification is applied in the field of alkalinity regulation based on deep denitrification of sulfur autotrophic denitrification filter. The effect of prolonging filling cycle and reducing cost

Pending Publication Date: 2022-05-17
JIANGNAN UNIV
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Problems solved by technology

[0006] Exploring the dosage of bicarbonate according to the nitrate nitrogen conditions of the influent can solve the problem of high hardness of the effluent water, and simultaneously optimize the acid production, high sulfate concentration and the need for inorganic carbon sources in the sulfur autotrophic denitrification process. Therefore, the sulfur autotrophic denitrification process can better cope with the change of influent nitrate, the operation mode is more flexible, the utilization rate of sulfur in the reactor is increased, and the amount of water can be treated at the same scale.

Method used

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  • Alkalinity regulation and control method based on deep nitrogen removal of sulfur autotrophic denitrification filter
  • Alkalinity regulation and control method based on deep nitrogen removal of sulfur autotrophic denitrification filter
  • Alkalinity regulation and control method based on deep nitrogen removal of sulfur autotrophic denitrification filter

Examples

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Embodiment 1

[0041] This example aims to explore the relationship between the dosage of alkalinity regulator and the denitrification effect. EXAMPLES Sodium bicarbonate solution is used as the alkalinity regulator of the pure sulfur type sulfur autotrophic denitrification filter, and sulfur element is used as the filler, and the dosage of the alkalinity regulator is respectively 125wt% of the theoretical alkalinity regulator dosage , 100wt%, 75wt%, 50wt%, 25wt%, the wastewater comes from the tail water of the sewage treatment plant, of which NO 3 - -N is 10mg / L, and when the hydraulic retention time (HRT) is 3h, the effluent NO 3 - -N change trend.

[0042] Depend on figure 2 It can be seen that under the condition that the dosage of the alkalinity regulator is 125wt% and 100wt% of the theoretical value, the denitrification effect of the filter is good, and the nitrate nitrogen in the effluent is about 0.2mg / L, and the nitrogen removal rate of 98% can be achieved; When the dosage of ...

Embodiment 2

[0046] This example aims to explore the relationship between the dosage of alkalinity regulator and the denitrification effect. In this embodiment, sodium carbonate solution is used as the alkalinity regulator of the pure sulfur type sulfur autotrophic denitrification filter, iron sulfide or ferrous sulfide is used as the filler, and the dosage of the alkalinity regulator is respectively the theoretical alkalinity regulator dosage The amount of 125wt%, 100wt%, 75wt%, 50wt%, 25wt%, when the influent NO3--N is 10mg / L, and the steady operation is 3h, that is, the hydraulic retention time (HRT) is 3h. 3 - -N change trend. Depend on Figure 5 It can be seen that under the condition that the dosage of the alkalinity regulator is 125wt% and 100wt% of the theoretical value, the denitrification effect of the filter is good, and the nitrate nitrogen in the effluent is about 0.5mg / L, and the nitrogen removal rate of 97% can be achieved; When the dosage of the alkalinity regulator is 7...

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Abstract

The invention provides an alkalinity regulation and control method based on deep nitrogen removal of a sulfur autotrophic denitrification filter tank, and belongs to the technical field of deep nitrogen removal treatment of wastewater. According to the invention, bicarbonate / carbonate is used as an alkalinity regulator to regulate and control the sulfur autotrophic denitrification filter tank for nitrate wastewater with higher requirements on nitrate removal, such as tail water upgrading of a sewage treatment plant or ecological water environment restoration. Compared with a traditional sulfur-calcium mixed type sulfur autotrophic denitrification filter tank, the total dissolved solid (TDS) increment and the sulfate concentration of effluent of the pure sulfur type sulfur autotrophic denitrification filter tank adopted by the invention are reduced by about one third, and the sulfur autotrophic denitrification technology has the advantage of regulating and controlling the sulfur autotrophic denitrification process; the process can better cope with the change of nitrate in inflow water quality, the operation mode is more flexible, and good environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of deep denitrification treatment of wastewater, and in particular relates to an alkalinity control method based on deep denitrification of a sulfur autotrophic denitrification filter. Background technique [0002] Nitrogen removal is one of the main issues in wastewater treatment. Excessive discharge of nitrogen into natural water bodies may cause serious environmental problems such as eutrophication of water bodies. Ammonia nitrogen can be well converted into nitrite and nitrate in the water biological treatment process of wastewater, so nitrite and nitrate are the main components of nitrogen pollution in the tail water of the sewage treatment plant, which can effectively remove the tail water of the sewage treatment plant The problem of nitrite and nitrate nitrogen is urgent. [0003] At present, there are many methods for nitrate removal, mainly including physical chemical method and biological method....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F101/10C02F101/16
CPCC02F3/28C02F1/66C02F2209/40C02F2101/163C02F2101/101C02F2303/22Y02W10/10
Inventor 刘和崔敏华潘辉郑志永
Owner JIANGNAN UNIV
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