Method for converting kitchen waste into wastewater denitrification carbon source through catalytic wet oxidation

A technology for catalyzing wet oxidation and kitchen waste, applied in the field of wet waste recycling, can solve the problems of low conversion rate, long cycle, low resource utilization efficiency, etc., and achieves short conversion time, reduction of nitrogen and phosphorus, and good economy. Effect

Inactive Publication Date: 2021-03-16
HUBEI JUNJI WATER TREATMENT
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the existing traditional bio-fermentation method for processing food waste can effectively treat food waste as a resource, the biological fermentation method requires a long cycle, low conversion rate, and low resource utilization efficiency.

Method used

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  • Method for converting kitchen waste into wastewater denitrification carbon source through catalytic wet oxidation
  • Method for converting kitchen waste into wastewater denitrification carbon source through catalytic wet oxidation
  • Method for converting kitchen waste into wastewater denitrification carbon source through catalytic wet oxidation

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Embodiment 1

[0031] This embodiment provides a method for catalytic wet oxidation of food waste into waste water denitrification carbon source, the process flow is as follows figure 1 As shown, the specific implementation steps are as follows: Take 50L of food waste, use screens, magnetic separation, etc. to screen out debris, and then crush the food waste into 10-50mm particle size by mechanical extrusion, shearing, etc.; The kitchen waste is broken into small particles for water replenishment. The mass ratio of food waste to water replenishment is 1:1 (the mass ratio of food waste to water replenishment is 1:1 to 1:2, preferably 1:1 in this embodiment), which is convenient Mix evenly with replenishing water; pump the material into the reactor, acid hydrolyze at 100°C (temperature range is 100-150°C, preferably 100°C in this embodiment) for 120min, and add FeSO 4 , the addition amount is 0.5% of the total mass of kitchen waste, promotes the hydrolysis and acidification reaction with the p...

Embodiment 2

[0033] Using the liquid prepared in Example 1 as a waste water denitrification carbon source to treat waste water containing nitrate nitrogen

[0034] The activated sludge of a sewage treatment plant in Wuhan was inoculated into a 10L SBR reactor for domestication, and the artificially prepared sewage was used for denitrification experiments. The experimental temperature was normal temperature, and the sludge concentration in the reactor was maintained at VSS=2500mg / L. Sodium is as nitrate (30mg / L nitrate radical), and add respectively the liquid carbon source (0.25g / L) that methyl alcohol (0.25g / L), glucose carbon source (0.25g / L) and embodiment 1 prepare, denitrification The reaction is carried out under the condition of micro-oxygen or anoxic (dissolved oxygen is less than 0.1mg / L). Each cycle of the experiment is 5h, and the corresponding carbon source is added at one time at the beginning of the reaction. The reaction stage is 4h, followed by 1h of precipitation. During ...

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Abstract

The invention relates to the field of wet garbage resourceful treatment, in particular to a method for converting kitchen waste into a wastewater denitrification carbon source through catalytic wet oxidation. The method comprises the following steps that screening and crushing pretreatment is performed on the kitchen waste, acidic hydrolysis is performed, the catalytic wet oxidation is performed on the kitchen waste in the presence of magnesium salt and phosphate by using Cu-Mn-Fe / Al2O3 as a catalyst, wet oxidation is performed at a certain pressure and a certain temperature, solid-liquid separation is performed after the reaction is finished to obtain liquid with acetic acid and acetate as main components, the liquid adopts a wastewater denitrification carbon source product, and solid residues are rich in humic acid and can be used for soil improvement. According to the method, the resource conversion time is short, and the wastewater denitrification carbon source is obtained; acid and alkali do not need to be used for adjusting pH, and economy is good; nitrogen and phosphorus in the liquid carbon source are efficiently immobilized and removed, nitrogen and phosphorus in a liquiddenitrification carbon source are effectively reduced, and nitrogen and phosphorus are transferred into residues to be used as a soil conditioner; and a new way is provided for rapid resource utilization of the kitchen waste.

Description

technical field [0001] The invention relates to the field of wet garbage resource treatment, in particular to a method for catalytic wet oxidation conversion of kitchen garbage into waste water denitrification carbon source. Background technique [0002] With the acceleration of my country's urbanization process and the improvement of residents' living standards, the output of kitchen waste is increasing year by year. In large cities such as Beijing, the proportion of kitchen waste is as high as 60%. The daily output is as high as 1100-1500t, and it is on the rise. Kitchen waste is the main component of domestic urban wet waste and has become an important aspect of environmental pollution. Because of its high moisture content, rich organic components, perishability, and low calorific value, food waste is landfilled if it is not properly treated and utilized, it will occupy a large amount of landfill storage capacity, and produce leachate, stench, etc. secondary pollution. ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor刘鲁建王威董俊张岚欣熊蔚张双峰曹斌强
OwnerHUBEI JUNJI WATER TREATMENT