Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nitrate nitrogen removal method and device for said method

A nitrate nitrogen and denitrification technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problem of reduced denitrification speed, insufficient denitrification treatment, and difficulty in tracking drainage. Temperature, water volume, pollutant concentration, etc.

Inactive Publication Date: 2011-12-28
NIPPON STEEL CHEMICAL CO LTD
View PDF26 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] However, due to the use of microorganisms, it is difficult to track changes in the temperature, water volume, and pollutant concentration of the wastewater.
For example, general sulfur oxidizing bacteria are inactive at low temperatures below 15°C, and the treatment capacity fluctuates with the seasons, and there may be cases where sufficient denitrification treatment cannot be performed. To avoid this, it is necessary to introduce treatment equipment with a margin
In addition, if you want to denitrify to an extremely low concentration, the denitrification speed will decrease, and there may even be problems such as the generation of hydrogen sulfide depending on the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nitrate nitrogen removal method and device for said method
  • Nitrate nitrogen removal method and device for said method
  • Nitrate nitrogen removal method and device for said method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] use figure 1 The shown nitrate nitrogen removal device 1 treats nitrate nitrogen while the drainage is circulating. First, make the drain flowing into the device from the water inlet 5 fill up to a predetermined liquid level (height of the water outlet 6). Afterwards, the circulating pump 4 is operated to circulate the upper layer water 9 from above to below through the pipe 3, and flow out from the lower square outlet. The outflowing drainage uniformly infiltrates the denitrification material filling layer 2 filled on the bottom plate having open holes, and is supplied for denitrification. Thereafter, the denitrified treated water is discharged from the water outlet 6 in an amount corresponding to the flow rate of the wastewater flowing in from the water inlet 5 .

[0085] In this embodiment, in a cuboid treatment tank with a capacity of 100 L, 40 kg of sulfur and calcium carbonate mixed compositions (filling density 1.2) with a particle diameter of 5 to 20 mm were ...

Embodiment 2

[0088] 3 kg of a denitrification material comprising an inorganic material obtained by making a sulfur molten mixture containing 50 parts by weight of sulfur and 50 parts by weight of calcium carbonate into pellets with a diameter of 5 to 20 mm was filled into the treatment tank. This denitrification material was cultured for 3 weeks with denitrification bacteria contained in soil collected from a green onion field.

[0089] use Figure 5 The nitrate nitrogen removal unit shown. The treatment tank is a cylinder with a diameter of 10 cm and a length of 70 cm. The tank volume of the preliminary tank 16 is set to about 20 L, the tank volume of the treatment tank is set to about 5 L, and the temperature of the preliminary tank and the treatment tank is set at 30° C. As drainage, artificial drainage with a nitrate nitrogen concentration of 200 mg / L was used by mixing OK-F-2 manufactured by Otsuka Chemical Co., Ltd. with tap water. The artificial drainage was passed continuously a...

Embodiment 3

[0092] used Figure 5 The nitrate nitrogen removal unit shown. By mixing OK-F-2 produced by Otsuka Chemical and tap water to prepare artificial drainage with a nitrate nitrogen concentration of 50mg / L, at a drainage temperature of 5°C and a drainage speed of 1L / hr, the water was continuously passed for 12 hours, and the circulation volume was studied. When the concentration of nitrate nitrogen at the outlet of the treatment tank after 12 hours was 10 L / hr or 0, the circulation rate was 5 mg / L at 0 and 2 mg / L at 10 L / hr.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

Nitrate nitrogen removal method and apparatus for said method. The present invention provides a method for removing nitrate nitrogen in wastewater using sulfur oxidizing bacteria in the presence of a denitrification material containing sulfur and calcium-based components. The method for removing nitrate nitrogen according to the present invention comprises: in a drainage treatment tank having a filling layer of denitrification material, allowing the drainage containing nitrate nitrogen to pass through the filling layer of the denitrification material, and making at least a part of the treated drainage through the filling layer Circulation to the inlet side of the fill layer or to the middle layer of the fill layer. In addition, the nitrate nitrogen removal device of the present invention has a circulation pump for circulating at least a part of the wastewater passing through the packed bed in the drainage treatment tank to the inlet side of the packed bed or to the intermediate layer. As the denitrification material, there are materials containing calcium carbonate and sulfur, and iron oxide may be mixed therein.

Description

technical field [0001] The present invention relates to a method for removing nitrate nitrogen in wastewater by microorganisms and a device for said method. Background technique [0002] In recent years, since the problem of nitrate ion concentration in wastewater has become more and more serious, various treatment systems using biological treatment methods have been considered. In particular, due to the state of excessive fertilization in recent years, it has become a problem that nitrate nitrogen is contained in a high concentration in the drainage of agricultural land such as fields, tea fields, orchards, and pastures. In addition, nitrate nitrogen contained in household drainage such as sewage tanks has also been raised as one of the problems of eutrophication of lakes and marshes. [0003] As a corresponding treatment method, there is known a subordinate nutrient denitrification technology that uses methanol or organic carbon sources in sludge as hydrogen donors for de...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/28C02F101/16
Inventor 宫永俊明平户靖浩市口哲男大石彻山田胜弘
Owner NIPPON STEEL CHEMICAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com