Method for preparing denitrification carbon source from blue-green algae

A denitrification carbon source and denitrification technology, applied in the direction of chemical instruments and methods, applications, inorganic chemistry, etc., can solve the problems of increasing the operating cost of urban sewage treatment plants, complex operation process, fast reaction speed, etc., and achieve resource transformation The effect of short time, large amount of residue and simple method

Inactive Publication Date: 2021-07-09
湖南九层台环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding commercial carbon sources greatly increases the operating cost of urban sewage treatment plants, so it is necessary to find suitable alternative carbon sources
Some studies have used solid carbon sources such as cellulose (such as leaves, bark, aloe flowers, straw, peanut shells, etc.) The denitrification effect of carbon sources is poor. For example, the denitrification rates of bark and aloe flowers are only 12.94% and 66.11%. In addition, compared with liquid carbon sources, solid alternative carbon sources lose the advantages of easy utilization and fast reaction speed.

Method used

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  • Method for preparing denitrification carbon source from blue-green algae
  • Method for preparing denitrification carbon source from blue-green algae
  • Method for preparing denitrification carbon source from blue-green algae

Examples

Experimental program
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Effect test

Embodiment 1

[0065]Take 50kg of blue-green algae in the reactor, add 50L of distilled water, and then add 0.25kg of FeSO 4 , and then acidic hydrolysis reaction at 100°C for 120min; after the reaction is completed, add Cu-Mn-Fe / Al 2 o 3 rod as a catalyst (the atomic ratio of Cu, Mn, and Fe in the catalyst is 0.5:2:0.5), and then add 0.5kg MgCl 2 +Na 2 HPO 4 (where Mg 2+ with PO 4 3- The molar ratio is 1:1); then oxygen (O 2 The feed rate is 50% of the COD value of the cyanobacteria hydrolyzate), adjust the pressure of the reactor to 5Mpa, and catalyze the wet oxidation reaction at a temperature of 250°C for 25min; -1.0MPa; the product after catalytic wet oxidation is separated by filter cloth to obtain high-purity denitrification carbon source liquid (yield rate is 14.2%) and solid residue (total N content is 2.4wt%, P 2 o 5 Content is 2.9wt%, meets NY525-2012 "organic fertilizer" standard).

Embodiment 2

[0067] Take 50kg of blue-green algae in the reactor, add 60L of distilled water, and then add 0.4kg of FeSO 4 , and then acidic hydrolysis reaction at 100°C for 120min; after the reaction is completed, add Cu-Mn-Fe / Al 2 o 3 rod as a catalyst (the atomic ratio of Cu, Mn, and Fe in the catalyst is 0.5:2:0.5), and then add 0.8kg MgSO 4 +Na 2 HPO 4 (where Mg 2+ with PO 4 3- The molar ratio is 1:1.1); then pass through oxygen (O 2 The feed rate is 45% of the COD value of the cyanobacteria hydrolyzate), adjust the pressure of the reactor to be 5Mpa, and catalyze the wet oxidation reaction at a temperature of 250°C for 25min; -1.0MPa; the product after catalytic wet oxidation is separated by filter cloth to obtain high-purity denitrification carbon source liquid (yield rate is 13.1%) and solid residue (total N content is 3.4wt%, P 2 o 5 Content is 2.2wt%, meets NY525-2012 "organic fertilizer" standard).

Embodiment 3

[0069] Take 50kg of blue-green algae in the reactor, add 70L of distilled water, and then add 0.5kg of FeSO 4 , and then acidic hydrolysis reaction at 100°C for 120min; after the reaction is completed, add Cu-Mn-Fe / Al 2 o 3 rod as a catalyst (the atomic ratio of Cu, Mn, and Fe in the catalyst is 0.5:2:0.5), and then add 1kg MgO+H 3 PO 4 (where Mg 2+ with PO 4 3- The molar ratio is 1:1.2); Then, oxygen (O 2 The feed rate is 55% of the COD value of the cyanobacteria hydrolyzate), adjust the pressure of the reactor to 5Mpa, and catalyze the wet oxidation reaction at a temperature of 250°C for 25min; -1.0MPa; the product after catalytic wet oxidation is separated by filter cloth to obtain high-purity denitrification carbon source liquid (yield rate is 14.7%) and solid residue (total N content is 3.2wt%, P 2 o 5 Content is 1.9wt%, meets NY525-2012 "organic fertilizer" standard).

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Abstract

The invention discloses a method for preparing a denitrification carbon source from blue-green algae. The method comprises the steps of carrying out acidic hydrolysis on blue-green algae, and carrying out wet oxidation by taking Cu-Mn-Fe / Al2O3 as a catalyst in the presence of magnesium salt and phosphate to obtain a liquid carbon source of which the main components are acetic acid and acetate and also obtain solid residues rich in nitrogen and phosphorus at the same time. The method disclosed by the invention is short in resource conversion time, simple in process and good in economical efficiency; efficient immobilization removal of nitrogen and phosphorus in the liquid carbon source is achieved, nitrogen and phosphorus in the liquid denitrification carbon source are effectively reduced, and nitrogen and phosphorus can be transferred into residues to be used as a soil conditioner; and no pollutant is discharged, and a new way is provided for rapid resource utilization of the blue-green algae.

Description

technical field [0001] The invention relates to a method for recycling blue-green algae, in particular to a method for preparing a denitrification carbon source by using blue-green algae. The invention belongs to the technical field of cyanobacteria resource treatment. Background technique [0002] Different degrees of eutrophication are common in freshwater lakes in my country. According to data from the 2018 Bulletin on the State of the Ecological Environment in China, among the 109 lakes (reservoirs) monitored for nutrient status, the lakes with mild eutrophication and moderate eutrophication share 31, accounting for 29%. A large amount of nitrogen and phosphorus wastewater enters the lake, making the water body eutrophic, leading to the widespread outbreak of blue-green algae, which seriously affects the environment and ecological balance. [0003] At present, the resource utilization methods of cyanobacteria at home and abroad mainly include extraction of natural pigme...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C02F3/28C02F3/34C05G1/00C05B7/00C01B25/45
CPCC02F3/28C02F3/34C05B7/00C01B25/451C02F2305/06
Inventor何汝靛何堤唐炳钦刘亮汪涛何原平刘红旗
Owner湖南九层台环境科技有限公司