Preparation method of sludge and kitchen waste biochar soil heavy metal passivator

A heavy metal passivator, kitchen waste technology, applied in the restoration of polluted soil, chemical instruments and methods, other chemical processes, etc., can solve the problems of improper disposal, accumulation of heavy metals, etc. Adsorption capacity, effect of preventing and controlling groundwater pollution

Inactive Publication Date: 2017-10-17
HENAN INST OF ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above situation, in order to solve the defects of the prior art, the purpose of the present invention is to provide a kind of preparation method of sludge, kitchen waste biochar soil heavy metal passivation agent, which c

Method used

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  • Preparation method of sludge and kitchen waste biochar soil heavy metal passivator
  • Preparation method of sludge and kitchen waste biochar soil heavy metal passivator
  • Preparation method of sludge and kitchen waste biochar soil heavy metal passivator

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Embodiment 1

[0024] 1) After dehydration treatment of urban sewage treatment plant sludge or water body dredging sludge, add 0.06mol / L oxalic acid solution and 0.08mol / L humic acid solution, the amount of leaching agent per 1kg of sludge is 2L, and rinse to remove Some heavy metals;

[0025] 2) crushing peanut shells, melon seed shells, corncobs, and bagasse until the particle size is less than 2cm, and the kitchen waste is dried fruit shells or peeled vegetables;

[0026] 3) Blend the sludge filtered by the plate and frame filter press with the kitchen waste according to the mass ratio of 10-15:1 to obtain a mixture;

[0027] 4) The mixture is naturally air-dried so that the moisture content is below 10%;

[0028] 5) The dried material in step 4) is crushed, passed through a 100-mesh sieve, placed in a pyrolysis device, and heated to 500-700°C under anaerobic conditions. After firing for 4 hours, let the muffle furnace cool down naturally to 25 °C, sludge biochar can be obtained.

Embodiment 2

[0030] 1) After the sludge from the urban sewage treatment plant is dehydrated by the sludge dehydrator, add 0.09mol / L citric acid solution, 0.03mol / L ethylenediaminetetraacetic acid solution, 0.013mol / L ferric chloride solution, The amount of leaching agent in the mud is 3L, and some heavy metals are removed by leaching;

[0031] 2) crushing corn cobs, bagasse, fruit peels, and vegetable stems and leaves until the particle size is less than 2 cm;

[0032] 3) Blend the sludge filtered by the plate and frame filter press with the kitchen waste according to the mass ratio of 10-15:1 to obtain a mixture;

[0033] 4) Dry the mixture in a dryer at 400°C so that the moisture content is below 10%;

[0034] 5) The dried material in step 4) is crushed, passed through a 100-mesh sieve, placed in a pyrolysis device, and heated to 500-700°C under anaerobic conditions. After firing for 4 hours, let the muffle furnace cool down naturally to 25 °C, sludge biochar can be obtained.

[0035]...

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Abstract

The invention relates to a preparation method of a sludge and kitchen waste biochar soil heavy metal passivator. The problem that heavy metals are continuously accumulated and increased in soil due to discharge and improper disposal of pollutants such as a large amount of industrial 'three wastes' and urban domestic garbage can be effectively solved. According to the technical scheme for solving the problem, raw materials include sludge and kitchen waste, wherein the sludge is sludge of an urban sewage treatment plant or dredging sludge at the bottom of water body and is used after being dehydrated, and the kitchen waste is one or mixture of more of shells, pomace, pericarp and vegetables. The biochar prepared by adopting the preparation method has strong adsorption capability on the heavy metals, can prevent the heavy metals in the soil from migrating to underground water and prevent and treat underground water pollution, and a carbon source is provided for heterotropic microorganisms in the soil, so that absorption of plants on moisture and soil nutrients is facilitated, oxygen flux in the soil of a surface layer is increased, and the biochar preparation method provided by the invention is innovative.

Description

technical field [0001] The invention relates to the technical field of soil passivation agent preparation, in particular to a method for preparing a soil heavy metal passivation agent from sludge and kitchen waste biochar. Background technique [0002] With the rapid development of modern industry and agriculture, a large number of industrial "three wastes", municipal solid waste and other pollutants are discharged and improperly disposed of, making heavy metals continue to accumulate in the soil, and the excessive use of pesticides and fertilizers containing heavy metals is also increasing. Increased the degree of heavy metal pollution in the soil, causing serious harm to humans and livestock. [0003] The amount of sludge produced by my country's sewage treatment plants is about 30 million tons per day, and a large amount of sludge will also be produced during the treatment of black and odorous water bodies. Because of its high water content and high heavy metal content, i...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B09C1/00
CPCB01J20/20B09C1/00
Inventor 刘碧波李印霞邓天天张继伟李亚林刘帅霞
Owner HENAN INST OF ENG
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