System and method for preparing large-size blue iron stone based on kitchen waste hydrothermal carbonization liquid

A technology for hydrothermal carbonization and kitchen waste, which is applied in chemical instruments and methods, water pollutants, anaerobic digestion treatment, etc. Problems such as poor cyanite purity, to achieve good environmental benefits, avoid oxidation problems, and good application potential.

Active Publication Date: 2022-05-13
BEIJING FORESTRY UNIVERSITY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the instability of ferrous iron which is easily oxidized, the purity of blue-ironite is usually poor
At the same time, there are still problems in the current research that the size of blue-ironite is too small and difficult to collect and separate. These problems hinder the promotion and application of blue-ironite crystallization method

Method used

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  • System and method for preparing large-size blue iron stone based on kitchen waste hydrothermal carbonization liquid
  • System and method for preparing large-size blue iron stone based on kitchen waste hydrothermal carbonization liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The following steps were used to prepare large-sized blue-ironite recovery phosphate from kitchen waste hydrothermal carbonization liquid:

[0033] (1) Adjust the pH of the hydrothermal carbonization solution of kitchen waste to 6.0~7.5 in the adjustment pool;

[0034] (2) After adjusting the pH value, the hydrothermal carbonization liquid of kitchen waste enters the two-stage fluidized bed from the bottom. m / h;

[0035] (3) Inoculate anaerobic sludge in the fluidized bed;

[0036] (4) The iron salt solution in the trivalent iron source pool enters the two-stage fluidized bed from the bottom;

[0037] (5) After the reaction, the hydrothermal carbonization liquid of kitchen waste overflows from the second-stage fluidized bed, and the effluent flows to the reflux pool by gravity. The outlet water overflows and discharges from the top of the backflow pool, and the backflow flow rate is 10 to 25 times that of the inflow water flow rate;

[0038] (6) An emptying pipe is ...

Embodiment 2-8

[0042] The ascending flow rate of the two-stage fluidized bed was changed according to the parameters in Table 1, and other process parameters were the same as in Example 1.

[0043] The ascending flow rate, phosphate removal efficiency and crystal size of each embodiment are shown in Table 1.

[0044] Table 1 The rising flow rate and phosphate removal efficiency, crystal size of each embodiment

[0045]

[0046] It can be seen from Table 1 that the removal efficiency of phosphate and the size of blue iron in the fluidized bed are mainly affected by the rising flow rate of the lower fluidized bed, and the removal efficiency of phosphate and the size of blue iron increase with the rising flow rate of the first stage First increase and then decrease. The ascending flow rate of the upper fluidized bed has little effect on the removal efficiency of phosphate and the size of bluestone. Each example shows that the method provided by the present invention uses a two-stage fluidi...

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Abstract

The invention discloses a system and method for preparing large-size blue iron stone based on kitchen waste hydrothermal carbonization liquid, and belongs to the technical field of sewage treatment.The system takes a two-section fluidized bed as core equipment, ferric iron is used as an iron source, anaerobic sludge is used for reducing the ferric iron into ferrous iron, the ferrous iron is combined with phosphate in the kitchen waste hydrothermal carbonization liquid, and the large-size blue iron stone is obtained. And the large-size blue iron stone is formed under the washing of the ascending velocity of the fluidized bed. According to the method, phosphate in the kitchen garbage hydrothermal carbonization liquid can be effectively removed, the problem that blue iron stone is not pure due to ferrous oxidation is avoided, and meanwhile large-size blue iron stone crystals which are easy to separate and collect can be generated.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a system and method for preparing large-sized blue iron stone based on a hydrothermal carbonization liquid of kitchen waste. Background technique [0002] The hydrothermal carbonization treatment of kitchen waste can obtain fuel with high calorific value. The Chinese invention application with the publication number CN111908753A discloses a method for preparing kitchen waste anaerobic biochar by ultrasonically assisted hydrothermal carbonization, including the following steps: s1: mixing kitchen waste anaerobic biochar with water, and The mixture is subjected to a hydrothermal carbonization reaction under ultrasonic-assisted conditions to obtain a hydrothermal carbonization liquid; s2: cooling, filtering, drying, crushing and sorting the hydrothermal carbonization liquid to obtain biochar of biogas residue. The Chinese invention application with the publication number CN1...

Claims

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Application Information

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IPC IPC(8): C02F9/14C30B29/14C30B7/14C02F3/28C02F1/66
CPCC02F3/28C02F1/66C30B29/14C30B7/14C02F2101/105C02F2301/02Y02E50/30
Inventor 徐康宁陈旭东马伟芳
Owner BEIJING FORESTRY UNIVERSITY
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