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Method for preparing constructed wetland substrate from cornstalks

A technology of artificial wetlands and corn stalks, applied in the field of environmental ecology, can solve the problems of no resource utilization, low resource utilization rate, and difficulty in popularization and application, and achieve the effects of low cost, long service life, and strong operability

Active Publication Date: 2018-09-25
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to one or more defects such as complex methods, high cost, easy blockage, secondary pollution, low resource utilization rate or no resource utilization, it is difficult to popularize and apply

Method used

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  • Method for preparing constructed wetland substrate from cornstalks

Examples

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example 1

[0016] Example 1: Substrate preparation of constructed wetlands in urban parks

[0017] like figure 1 As shown, the straw in this method goes through six steps successively: drying, crushing, carbonization, low-temperature activation, matrix preparation and matrix block preparation. First, remove the leaves of the harvested corn stalks and then dry them in the air until the water content is lower than 15%, then separate the skins from the husks; ~8mm, 8~12mm three particle size ranges, the length of the removed straw husk is 5~10mm, and the width is less than 5mm; thirdly, the crushed corn stalk particles are carbonized at 225°C for 100min, and the crushed straw husk Carbonize the particles at 400°C for 55 minutes; fourth, soak the carbonized corn stalk-based activated carbon and straw skin-based activated carbon for 18 hours, and then freeze the saturated matrix at -25°C for 3 days before low-temperature activation; Fifth, after activation, straw-based activated carbon with...

example 2

[0024] Example 2: Substrate Preparation of Sewage Treatment Constructed Wetland

[0025] like figure 1 As shown, there are six steps in the method: first, first remove the leaves of the harvested corn stalks and then dry them in the sun until the water content is lower than 15%. The corn stalks are crushed to three particle size ranges of 1-5mm, 5-8mm, and 8-12mm. The length of the removed straw bark is 5-10mm and the width is less than 5mm; carbonization under the same conditions for 80 minutes, and the crushed straw husk particles were carbonized at 450°C for 45 minutes; fourth, soak the carbonized corn stalk-based activated carbon and straw husk-based activated carbon for 26 hours, and then soak the saturated matrix at -35°C Frost heaving for 3 days for low-temperature activation; fifth, after activation, mix straw-based activated carbon with different particle sizes, and add coarse sand with a total mass of 45% and a particle size of 0.5-1 mm to the mixture, and fully sti...

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Abstract

The invention discloses a method for preparing constructed wetland substrate from cornstalks. The method includes steps of airing, crushing, carbonizing, low-temperature activating, substrate mixing and substrate block preparation. Harvested cornstalks are defoliated and aired until the moisture content reaches 15%, skin and stalks are separated and crushed into different specifications prior to carbonizing, then soaking in water and low-temperature activation are performed, and coarse sand in particle size of 0.5-1mm is added into activated stalk based activated carbon to obtain substrate blocks. The substrate blocks are used for constructed wetland, and straw skin based activated carbon is placed at the top of the constructed wetland. The prepared constructed wetland substrate is renewable and effective in domestic sewage purification, and waste substrate can be used for organic fertilizer preparation after a use cycle ends, so that high recycling rate is realized.

Description

technical field [0001] The invention relates to the technical field of environmental ecology in environmental science and engineering, in particular to a method for preparing artificial wetland matrix from corn stalks. Background technique [0002] With the development of our country's economy and the improvement of the level of urbanization, the amount of domestic sewage produced in our country's cities is large, which is increasing year by year. The cost of purifying domestic sewage by industrial methods is high, and it is difficult to treat the purified sludge, which not only pollutes the environment, but also has high treatment costs. Constructed wetlands achieve efficient purification of domestic sewage through substrate absorption, plant adsorption, and microbial decomposition, while producing certain landscape effects. Constructed wetlands have a low cost of treating domestic sewage, and at the same time generate biomass energy, effectively utilizing nitrogen and pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCC02F3/32
Inventor 徐建玲王汉席刘学军盛连喜
Owner NORTHEAST NORMAL UNIVERSITY
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