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Method for preparing carbon source extracting solution capable of increasing denitrification efficiency of constructed wetland

A technology for denitrification efficiency and artificial wetlands, which is applied in chemical instruments and methods, sustainable biological treatment, water/sludge/sewage treatment, etc. The effect of saving the cost of additional carbon sources

Inactive Publication Date: 2013-08-28
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a carbon source extraction solution that improves the denitrification efficiency of constructed wetlands. The method is used to realize the plant carbon source material of the method of the present invention, which is economical and easy to obtain; the carbon source extraction method is convenient and fast. , the operation and subsequent maintenance and management are very simple; the invention solves the technical problem of low denitrification efficiency when the artificial wetland treats low C / N sewage with a simple method, and at the same time, the method of the invention can also improve the difficulty of plant carbon source materials. Degradability issues, improve the denitrification efficiency of constructed wetlands, and save the cost of additional carbon sources

Method used

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  • Method for preparing carbon source extracting solution capable of increasing denitrification efficiency of constructed wetland
  • Method for preparing carbon source extracting solution capable of increasing denitrification efficiency of constructed wetland
  • Method for preparing carbon source extracting solution capable of increasing denitrification efficiency of constructed wetland

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Wetland plant canna dead leaves, cattail dead leaves, and agricultural waste rice stalks were selected as carbon source extracts. After recycling, they were cleaned and dehumidified in a drying box for storage. Then cut the three kinds of carbon source extracts into 2-3cm uniform segments, and add it and 2% dilute sulfuric acid solution to the hydrolysis device at a mass ratio of 1:810 for heating and hydrolysis, and the hydrolysis time is set at 10-60 minutes Within 10 minutes, the COD concentration in each hydrolysis device was sampled and tested to obtain the concentration value of the plant carbon source released at that time. The specific results are shown in Table 1.

[0024] Table 1 Carbon source release of each substance in 2% dilute sulfuric acid solution (taking 1g litter as an example)

[0025]

[0026] (2) According to Table 1 in step 1), the dead leaves of typha had a better carbon source release effect than the other two plant carbon sources. Ther...

Embodiment 2

[0028] (1) Wetland plant canna dead leaves, cattail dead leaves, and agricultural waste rice stalks were selected as carbon source extracts. After recycling, they were cleaned and dehumidified in a drying box for storage. Then cut the three kinds of carbon source extracts into 2-3cm uniform small pieces, weigh 1g respectively and place them in the prepared 3 hydrolysis devices, and add it and 5% dilute sulfuric acid solution to the hydrolysis at a mass ratio of 1:880 Heating hydrolysis is carried out in the device, and the hydrolysis time is set within 10 to 60 minutes. The COD concentration in each beaker is sampled and detected at intervals of 10 minutes, and the concentration value of the plant carbon source released at that time is obtained. The specific results are shown in Table 2.

[0029] Table 2 Carbon source release of each substance in 5% dilute sulfuric acid solution (taking 1g litter as an example)

[0030]

[0031] (2) According to Table 2 in step 1), rice st...

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Abstract

The invention relates to a method for preparing a carbon source extracting solution capable of increasing the denitrification efficiency of a constructed wetland. The method comprises the steps of recovering, cleaning, dehumidifying and cutting a wetland plant material serving as a carbon source extracting substance, enabling the cut carbon source extract and a sulfuric acid solution which are in the mass ratio of 1: (810-880) to be subjected to hydrolysis reaction for 10-60 min at the temperature of 90-100 DEG C, and cooling, thereby obtaining the carbon source extracting solution. According to the method, the method is simple, and a plant carbon source is convenient in material obtaining, adequate in sources and low in cost and can be used for increasing the denitrification efficiency of the constructed wetland in low-carbon-nitrogen-ratio sewage treatment in a manner of serving as an external carbon source, so that the application effect is remarkable.

Description

technical field [0001] The invention belongs to the field of preparation of sewage treatment materials, and in particular relates to a method for preparing a carbon source extraction solution for improving the denitrification efficiency of constructed wetlands. Background technique [0002] In the context of increasingly serious water eutrophication, water environment nitrogen pollution control and wastewater denitrification treatment have become research hotspots in the field of water treatment. As an ecological and low-cost water treatment technology, constructed wetland has been widely used in the denitrification treatment of sewage and wastewater at home and abroad. There are many denitrification mechanisms in constructed wetlands, among which the nitrification-denitrification process is generally considered to be the most important denitrification mechanism, and the nitrification-denitrification process is greatly affected by the supply level of carbon sources. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCY02W10/10
Inventor 丁怡宋新山王玮王宇晖
Owner DONGHUA UNIV
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