Heat-treatment recycling method for excrement

A technology of recycling and excrement, applied in pyrolysis treatment of sludge, chemical instruments and methods, sludge treatment, etc., to achieve the effect of preventing pollution

Inactive Publication Date: 2017-05-17
CHINA AGRI UNIV
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  • Heat-treatment recycling method for excrement

Examples

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Embodiment 1

[0044] A method for fecal heat treatment and recycling, including the following steps:

[0045] a) Add 50 g of pig manure with a water content of 80% into the reaction kettle, then seal the reaction kettle, and give an initial pressure of 4 MPa with gas.

[0046] b) Heat the reaction kettle to 320°C for 180 minutes, then stop heating.

[0047] c) Cool to room temperature, first connect a 2L gas bag to the gas outlet of the reactor for gas collection; then open the reactor to collect the remaining mixture; filter the remaining mixture to obtain an aqueous phase containing Na, K, and P elements and remaining substances .

[0048] The recovery rate of Na, K, N and P elements in the water phase was detected. Na and K elements were determined by inductively coupled plasma emission spectrometer; N and P elements were determined by potassium persulfate oxidation method and molybdenum antimony spectrophotometric method.

[0049] After testing, the recovery rate of Na, K, N and P elements in pi...

Embodiment 2

[0057] A method for fecal heat treatment and recycling, including the following steps:

[0058] a) Add 30 g of human feces with a water content of 75% into the reactor, then seal the reactor, and give an initial pressure of 2 MPa with gas.

[0059] b) Heat the reactor to 450°C for 0 min, then stop heating.

[0060] c) Cool to room temperature, first connect a 2L gas bag to the gas outlet of the reactor to collect gas; then open the reactor to collect the remaining mixture; filter the remaining mixture to obtain an aqueous phase containing Na, K, and P elements and remaining substances .

[0061] The recovery rate of Na, K, N and P elements in the water phase was detected. Na and K elements were determined by inductively coupled plasma emission spectrometer; N and P elements were determined by potassium persulfate oxidation method and molybdenum antimony spectrophotometric method.

[0062] After testing, the recovery rate of Na, K, N and P elements in human feces in this example is 70%....

Embodiment 3

[0070] A method for fecal heat treatment and recycling, including the following steps:

[0071] a) Add 40 g of cow dung with a water content of 95% to the reaction kettle, then seal the reaction kettle, and give an initial pressure of 0 MPa with gas.

[0072] b) Heat the reaction kettle to 220°C for 60 minutes, then stop heating.

[0073] c) Cool to room temperature, first connect a 2L gas bag to the gas outlet of the reactor to collect gas; then open the reactor to collect the remaining mixture; filter the remaining mixture to obtain an aqueous phase containing Na, K, and P elements and remaining substances .

[0074] The recovery rate of Na, K, N and P elements in the water phase was detected. Na and K elements were determined by inductively coupled plasma emission spectrometer; N and P elements were determined by potassium persulfate oxidation method and molybdenum antimony spectrophotometric method.

[0075] After testing, the recovery rate of the Na, K, N, and P elements in the co...

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Abstract

The invention discloses a heat-treatment recycling method for excrement. The method comprises steps as follows: the excrement is added to a reaction kettle, treated by applying initial pressure and heated, and a residual mixture is collected, extracted with an organic solvent, filtered, distillated and dried. According to the heat-treatment recycling method for excrement, harmless treatment of the excrement and recycling of resources are realized with a hydrothermal liquefying method. C, H, N, P and metal elements including Ca, Mg, Al, Fe, Zn, Cu, Cr, Ni, Co and Pb are recycled while harmless treatment of waste biomass is realized. The excrement can be further recycled while safety and sanitation management of the excrement is realized.

Description

Technical field [0001] The invention relates to the field of hydrothermal liquefaction treatment of solid wastes, in particular to a method for harmless treatment and resource recovery of feces (including human dung, pig dung, cow dung, sheep dung, chicken dung, etc.). Background technique [0002] Hydrothermal liquefaction is a green and environmentally friendly technology. It is carried out at a temperature of 200~500℃, a pressure of 5~25MPa, and water as a solvent. In this process, biomass is decomposed into small molecules, and the small molecules are polymerized into different Compounds that form bio-oils, water phase products, gases and solid residues. However, the current hydrothermal liquefaction is focused on oil production, and there is no research on the recovery of metals and nutrients in animal manure. [0003] The starting point of the present invention is to realize the harmless treatment of excrement and the recycling of resources. The present invention aims to re...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/00
CPCC02F11/10C02F11/00
Inventor 刘志丹卢建文朱张兵张源辉
Owner CHINA AGRI UNIV
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