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

Method for enhancing denitrification of subsurface flow constructed wetland by adding alkali-heat-treatment maize straw carbon source

A corn straw carbon and heat treatment technology, applied in chemical instruments and methods, anaerobic digestion treatment, sustainable biological treatment, etc., can solve the problems of low denitrification efficiency in subsurface flow constructed wetlands, and achieve easy maintenance and management, simple methods, low cost effect

Inactive Publication Date: 2016-06-22
CHINESE RES ACAD OF ENVIRONMENTAL SCI
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the low carbon-nitrogen ratio in the effluent of the sewage plant, inhibit the activity of denitrifying bacteria, and cause the low denitrification efficiency of the subsurface constructed wetland

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
  • Method for enhancing denitrification of subsurface flow constructed wetland by adding alkali-heat-treatment maize straw carbon source
  • Method for enhancing denitrification of subsurface flow constructed wetland by adding alkali-heat-treatment maize straw carbon source
  • Method for enhancing denitrification of subsurface flow constructed wetland by adding alkali-heat-treatment maize straw carbon source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention is further described below in conjunction with the accompanying drawings and examples, but not limited by the accompanying drawings and examples.

[0021] The specific steps of the method of the present invention are described in detail as follows:

[0022] (1) Carbon source preparation: In this experiment, 2 kg of ordinary corn stalks were selected, cut into small pieces of about 1 cm, washed with deionized water to remove dust, and dried at 108 ° C for two hours, and the dried corn stalks were used 1% NaOH solution According to the solid-liquid ratio of 1:30, put it into a beaker, heat it in a water bath at 90°C for 1 hour, take out the straw carbon source, and dry it to a constant weight.

[0023] (2) Static release experiment: Dry the straw treated with alkali to constant weight, weigh 1g and put it in a 250mL Erlenmeyer flask, add 200mL distilled water to soak, and seal the bottle mouth with plastic wrap to prevent debris from entering. Culti...

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

No PUM Login to View More

Abstract

The invention discloses a method for enhancing the denitrification of a subsurface flow constructed wetland by adding an alkali-heat-treatment maize straw carbon source, and belongs to the technical field of the sewage treatment of constructed wetlands. The method comprises the following steps of (1), using maize straw as a raw material, cutting the maize straw into equal-length small segments, washing the equal-length small segments by using water to remove dust, drying the equal-length small segments, proportioning the equal-length small segments according to a solid-to-liquid ratio of 1 to 30 by using a 1 percent NaOH solution, heating an obtained mixture for 1h at a constant temperature of 90 DEG C in a water bath, taking out the mixture, and drying the mixture to a constant weight; (2), carrying out a static release experiment on alkali-heated maize straw carbon source, determining the carbon source release amount and the nitrogen source release amount of the alkali-heated maize straw carbon source through a fitted curve, and calculating the addition amount of the carbon source in the wetland according to that the ratio of the influent COD (Chemical Oxygen Demand) concentration, the TN (total nitrogen) concentration and the influent flow of the subsurface flow constructed wetland to C / N (carbon / nitrogen) of sewage is equal to 7 to 1 is an optimal carbon nitrogen ratio; (3), adding the alkali-heated maize straw carbon source at the bottom of a soil layer and at the upper part of a gravel layer of the wetland according to the configuration and the running mode of the subsurface flow constructed wetland. By using the method for enhancing the denitrification of the subsurface flow constructed wetland by adding the alkali-heat-treatment maize straw carbon source, the TN removal rate of the subsurface flow constructed wetland is increased by 31.07 percent.

Description

technical field [0001] The invention relates to a subsurface flow constructed wetland enhanced denitrification method for adding alkali to heat corn stalk carbon sources, which belongs to the technical field of constructed wetland sewage treatment and relates to a method for enhancing the denitrification treatment effect of constructed wetlands by adding an external carbon source. technical background [0002] The use of subsurface flow constructed wetlands to deeply purify the effluent of sewage treatment plants has been widely used in my country. However, due to the low carbon and nitrogen ratio of the effluent of the sewage treatment plant, the activity of denitrifying bacteria in the wetland is inhibited, and the denitrification efficiency of the subsurface constructed wetland is greatly reduced. Therefore, in recent years, enhancing the denitrification efficiency of subsurface flow constructed wetlands by adding carbon sources has gradually become one of the hot researc...

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): C02F3/34C02F3/32C02F3/28
CPCC02F3/28C02F3/32C02F3/34C02F2305/06Y02W10/10
Inventor 高红杰吕纯剑姚川颖于会彬宋永会彭剑峰张羽韩璐刘瑞霞
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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