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A deep denitrification process for sewage based on chemical separation-physical transfer of nitrate nitrogen

A biological denitrification and sewage technology, which is applied in the field of water treatment, can solve the problems of high nitrate nitrogen content in the effluent, large floor space, and high infrastructure costs, and achieve enhanced denitrification effects, deep denitrification, and improved denitrification efficiency Effect

Active Publication Date: 2020-03-20
南京华淳环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problems of high nitrate nitrogen content in sewage treatment, total nitrogen is difficult to reach the standard stably, but the traditional upgrading and transformation scheme occupies a large area, and the cost of infrastructure is high, the present invention provides a new deep sewage denitrification method and Its equipment, the method and equipment can improve the denitrification efficiency and strengthen the denitrification effect without increasing or minimizing the area occupied by sewage treatment facilities.

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  • A deep denitrification process for sewage based on chemical separation-physical transfer of nitrate nitrogen
  • A deep denitrification process for sewage based on chemical separation-physical transfer of nitrate nitrogen

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Embodiment 1

[0039] An urban domestic sewage treatment plant adopts the DE type double-ditch oxidation ditch treatment process, and the effluent implements the first-level (B) standard in GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants". With the development of economy and society, the environmental protection department has increasingly stringent requirements on the effluent treatment of sewage treatment plants. The sewage treatment plant is also facing the task of upgrading, and the effluent must meet the requirements of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002 Class A Standard. The main difficulty lies in the further removal of total nitrogen. However, the land around the sewage treatment plant has basically been developed, and there is no condition to provide enough space for the upgrading of the sewage treatment plant. Therefore adopt technological scheme described in the present invention to transform sewage pla...

Embodiment 2

[0052] A rural domestic sewage treatment plant adopts A2 / O treatment process. As the total nitrogen content in the influent has increased to 45-50mg / L in recent years, the average total nitrogen in the treated effluent is 20mg / L, which cannot meet the discharge standard of 15mg / L. Therefore adopt technological scheme described in the present invention to carry out upgrading.

[0053] The specific process scheme steps are as follows:

[0054] (1) Select a strongly basic anion exchange resin with a nitrate nitrogen adsorption capacity of 155 mg / g. The design scale of the sewage plant is 5000m 3 / d, considering the change of instantaneous flow rate, the design flow rate per hour is 250m 3 / h. During the treatment process, the initial dosage of ion exchange resin is 0.4% (mass percentage) of the treated water, that is, the amount of ion exchange resin required per hour initially is 1000 kg. Add 1000kg of ion exchange resin to the loading unit composed of engineering plastic f...

Embodiment 3

[0064]Due to the increasingly stringent effluent standards of an industrial sewage treatment plant in recent years, the original treatment facilities could not meet the requirements and needed to be upgraded. Among them, it is difficult to solve the problem that the concentration of total nitrogen in the effluent is too high. Before the renovation, the average concentration of total nitrogen in the effluent reached 25.3mg / L, and the highest reached 28.4mg / L. It far exceeds the standard of total nitrogen concentration in the effluent <15mg / L stipulated by the sewage treatment plant. After testing, more than 90% of the total nitrogen is nitrate nitrogen. However, the cost of the traditional transformation method is high and the floor space is large, so the process scheme of the present invention is adopted for upgrading and transformation.

[0065] The specific process scheme steps are as follows:

[0066] (1) Select the denitrification flocculant described in the invention p...

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Abstract

The invention discloses a nitrate nitrogen chemical separation-physical transfer-based deep denitrification process for sewage. The sewage denitrification process comprises the following steps of (1) loading an agent capable of removing nitrate nitrogen from water into a loading unit to form an agent unit, and feeding the agent unit to sewage in a sewage treatment unit which needs to reduce the content of the nitrate nitrogen for agent treatment; (2) completing treatment of the sewage after agent treatment for 1-5 hours, transferring the nitrate nitrogen in the sewage to the agent, wherein the total nitrogen content in the sewage is reduced and reaches the effluent standard; and (3) separating the agent unit from the sewage, physically transferring and immersing the agent unit into an anaerobic biological reaction unit, resolving the nitrate nitrogen on the agent into the anaerobic biological reaction unit in the reaction process and transforming the nitrate nitrogen into gaseous nitrogen through microbial denitrification action, thereby achieving removal of the nitrogen. The denitrification efficiency can be improved and the denitrification effect can be strengthened on the premise that the floor area of a sewage treatment facility is not increased or the floor area is increased as little as possible.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a process for deep denitrification of sewage based on the physical transfer of nitrate nitrogen and equipment thereof. Background technique [0002] Nitrate widely exists in surface water and groundwater, and the pollution of nitrate in our country is increasing year by year. Excessive nitrates will cause eutrophication of water bodies, and long-term drinking of drinking water containing excessive nitrates will also endanger human health. Nitrate removal has been receiving much attention in the field of water treatment. [0003] At present, most of the effluent from domestic sewage treatment plants will be directly discharged into natural water bodies as ecological replenishment water after further regeneration treatment. Especially in northern water-scarce areas, taking Beijing as an example, about 1 / 3 of the reclaimed water from domestic sewage treatment plants is used for ecol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/28C02F1/42C02F1/52C02F3/02C02F3/28C02F101/16
CPCC02F1/281C02F1/283C02F1/285C02F1/42C02F1/52C02F3/02C02F3/1257C02F3/28C02F3/30C02F9/00C02F2001/007C02F2101/163C02F2209/15C02F2209/22C02F2301/04C02F2301/043Y02W10/10
Inventor 赵华章孟勇沈延军袁梓文
Owner 南京华淳环保股份有限公司
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