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Multi-medium filtering biological denitrification process and apparatus thereof

A technology of multi-media filtration and biological denitrification, which is applied in the direction of biological water/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problem of higher infrastructure investment and operating costs than the device of the present invention, high investment and operating costs, The small molecular weight of nitrate nitrogen and other problems can be achieved to reduce investment and operation costs, reduce volume and floor space, and quickly remove the effect

Active Publication Date: 2006-07-19
CHONGQING KANGDA ENVIRONMENTAL PROTECTION IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Although various biological treatment processes have been developed at home and abroad to improve the denitrification effect of sewage, so that nitrate nitrogen is finally reduced to nitrogen discharge, but whether it is the upgrading of the original sewage treatment plant or the construction of a new multi-functional sewage treatment plant, the same treatment Under the target situation, capital construction investment and operation cost are all higher than the device of the present invention
In addition, due to the relatively small molecular weight of nitrate nitrogen, the current widely used coagulation technology is not helpful
In traditional drinking water treatment, ion exchange, biological denitrification, reverse osmosis desalination or electrodialysis are currently available methods for removing nitrate nitrogen. Although technically effective, the investment and operating costs are higher The device of the present invention is dozens of times

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  • Multi-medium filtering biological denitrification process and apparatus thereof
  • Multi-medium filtering biological denitrification process and apparatus thereof

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Embodiment 1

[0026] The nitrate and nitrite solutions prepared from tap water, nitrate, and tap water and nitrite in a laboratory were used as raw water, and the filter medium used was natural fruit shells: apricot shells with a particle size of 2 to 4 cm. The particle size of the quartz sand filter material selected for the upper and lower filter media is 3-6cm and 0.5-1cm respectively. The way of water intake is downward flow. The selected filter device is a cylindrical plexiglass reactor with a diameter of 19cm and a height of 38cm. The thickness of the quartz sand at the bottom of the reactor is 5cm, the thickness of the walnut shell is 18cm, and the thickness of the quartz sand at the upper part of the reactor is 5cm. The effective volume of the test is 7.9L. The online sensor fixing bracket is 10cm away from the top of the reactor, and the temperature range of the test is 20-22°C. The tests investigated nitrate and nitrite solutions, and the test concentrations of the two solutions...

Embodiment 2

[0028] Taking high nitrate nitrogen wastewater from an industrial wastewater treatment station in a factory as raw water, the selected filter medium is natural walnut shell with a particle size of 1-2cm; 0.5-1cm. The way of water intake is downward flow. The continuous flow reactor selected for the test is a rectangular open reactor with a length of 93cm and a width of 20cm. The thickness of the quartz sand at the bottom of the reactor is 3cm, and the thickness of the walnut shell is 13cm. The effective volume of the continuous flow reactor was 33.5 L. The test investigated the concentration of nitrate solution was 30mg / L-35mg / L and 50-52mg / L respectively. The test results found that under the same hydraulic retention time of 9 hours as the traditional activated sludge process, the removal rate of nitrate nitrogen increased by 43-47.5%, and the SS of the effluent increased by 42-46%. The large-scale activated sludge treatment device and the cost of external carbon source do...

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Abstract

The disclosed denitrification method with least cost compared with prior art comprises: an in-out water system, a filter contained filter medium with size reducing gradually along the inlet direction, a backwash system, and a PLC control system. Wherein, the inlet pump (1) connects with the filter (11) with lower end linked both with the outlet valve (6) and the backwash pump (7) and upper end linked with the backwash outlet valve (9); it arranges the sensor (10) in the filter (11) to contact with water. When the SCOD achieves stable value but less than 100mg / L, putting the medium into filter; using PLC control program to adjust water residence time; backwashing for 2-3h with flux adjusted by the PLC control box; and repeating to filter and backwash. This invention simplifies operation and reduces cost without secondary pollution.

Description

technical field [0001] The invention relates to the removal of nitrate nitrogen in waste water by means of filter medium filtration, replaces the traditional activated sludge biological denitrification process, and is used for secondary deep denitrification of urban sewage and industrial waste water and drinking water containing nitrate nitrogen. Background technique [0002] Although various biological treatment processes have been developed at home and abroad to improve the denitrification effect of sewage, so that nitrate nitrogen is finally reduced to nitrogen discharge, but whether it is the upgrading of the original sewage treatment plant or the construction of a new multi-functional sewage treatment plant, the same treatment Under the target condition, both capital construction investment and operation cost are higher than the device of the present invention. In addition, due to the relatively small molecular weight of nitrate nitrogen, currently widely used coagulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F1/00C02F101/16C02F101/38
Inventor 彭永臻王晓莲
Owner CHONGQING KANGDA ENVIRONMENTAL PROTECTION IND GRP