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Preparation of modified sludge hydrothermal carbon material and application of modified sludge hydrothermal carbon material in non-point source pollution emission reduction

A sludge water and thermal carbon technology is applied to the preparation of modified sludge hydrothermal carbon materials and its application in the field of non-point source pollution reduction. The effect of ammonia volatilization, promoting ammonia adsorption, and increasing absorption

Active Publication Date: 2020-03-27
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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Problems solved by technology

Nitrogen loss reduces plant available nitrogen and causes environmental problems

Method used

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  • Preparation of modified sludge hydrothermal carbon material and application of modified sludge hydrothermal carbon material in non-point source pollution emission reduction
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  • Preparation of modified sludge hydrothermal carbon material and application of modified sludge hydrothermal carbon material in non-point source pollution emission reduction

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Embodiment Construction

[0033] The embodiments of the present invention will be further described below in conjunction with the examples.

[0034] A method for preparing a modified sludge hydrothermal carbon material, comprising the steps of:

[0035] Wet sludge treated with anaerobic digestion and containing 0.8-1.2M magnesium citrate, 0.8-1.2%H 2 SO 4 The reaction medium solution is mixed, wherein the ratio of wet sludge to reaction medium solution is 1:1-4w / v; the mixture of wet sludge and reaction medium solution is placed in a high-pressure reactor, at 250-300°C and 4- Hydrothermal carbonization under the condition of 10MPa for 1-2 hours to prepare modified sludge hydrothermal carbon materials; collect modified sludge hydrothermal carbon materials, and then dry the modified sludge hydrothermal carbon materials for later use;

[0036] Alternatively, the wet sludge treated with anaerobic digestion is dried to obtain dried sludge, which contains 0.8-1.2M magnesium citrate, 0.8-1.2% H 2 SO 4 The...

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Abstract

The invention relates to preparation of a modified sludge hydrothermal carbon material and the application of the modified sludge hydrothermal carbon material in non-point source pollution emission reduction. Wet sludge subjected to anaerobic digestion treatment is mixed with a reaction medium solution containing 0.8-1.2 M of magnesium citrate solution and 0.8-1.2% of H2SO4, wherein the ratio of the wet sludge to the reaction medium solution is 1: (1-4) w / v. The mixture of the wet sludge and the reaction medium solution is put into a high-pressure reaction kettle, and the hydrothermal carbonization is performed at 250-300 DEG C and 4-10 MPa for 1-2 hours to obtain the modified sludge hydrothermal carbon material. The modified sludge hydrothermal carbon material is collected and then is dried for later use. The modified sludge hydrothermal carbon material can be applied to rice field soil, the ammonia volatilization can be inhibited, the nitrogen loss in water on the surface of a rice field is reduced, the nitrogen utilization efficiency of rice is improved, the rice yield is increased, and the modified sludge hydrothermal carbon material has positive significance in sustainable rice production.

Description

technical field [0001] The invention relates to the preparation of a modified sludge hydrothermal carbon material and its application in reducing non-point source pollution. Background technique [0002] Nitrogen is the main nutrient element for plant growth. Nitrogen fertilizer use is projected to increase from 105 Mt in 2010 to 180 Mt in 2050. In paddy fields, nitrogen fertilization often exceeds plant requirements, and most of the nitrogen fertilization is due to ammonia (NH 3 ) is lost due to volatilization. Nitrification and denitrification caused by soil microorganisms 2 O and N 2 and are lost in runoff during storms and mid-season drainage. Nitrogen loss reduces plant available nitrogen and causes environmental problems. Globally, the estimated annual NH 3 Volatilization losses amounted to 32 Tg in total, leading to air pollution through the formation of particulate matter (e.g. PM2.5 with a diameter ≤2.5 μm), eutrophication of water and soil acidification afte...

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Application Information

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IPC IPC(8): C05G3/90C02F11/10C10B53/00
CPCC02F11/10C05D5/00C10B53/00Y02P60/21
Inventor 冯彦房薛利红褚清南杨林章花昀何世颖李德天
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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