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Novel biochar prepared by mixing sludge and red soil, and preparation method and application thereof

A biochar, red soil technology, applied in applications, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of difficult sludge disposal, difficult cultivation of acidic soil, and easy pollution of fish tank water quality, and achieves prolonged replacement. Effects of water cycles, increased soil exchangeable base cation content, enhanced performance

Active Publication Date: 2019-11-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at problems such as easy pollution of fish tank water quality, difficulty in disposal of residual sludge from urban sewage plants, and difficulty in cultivating acidic soil, the present invention provides a new type of biochar prepared by mixing sludge and red soil and its preparation method and application

Method used

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  • Novel biochar prepared by mixing sludge and red soil, and preparation method and application thereof
  • Novel biochar prepared by mixing sludge and red soil, and preparation method and application thereof
  • Novel biochar prepared by mixing sludge and red soil, and preparation method and application thereof

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Embodiment 1

[0041] The preparation and application of new biochar such as figure 1 As shown, a new type of biochar prepared by mixing sludge and red soil is prepared by the following method:

[0042](1) Take the mechanically dewatered sludge with a moisture content of 75%, add red soil, and the red soil is the soil structure A0 layer, that is, the litter layer within 5cm from the ground surface, and the mass ratio of the mechanically dewatered sludge to the red soil is 1: 1. Move it into the oven for drying, the oven drying temperature is 60°C, and the drying time is 48 hours; and grind and sieve through a 200-mesh sieve; add the asparagus powder, and the dosage is 5% of the mass of the mixture; then mix with the nitric acid solution, the concentration of the nitric acid solution 6mol·L -1 , the quality of the nitric acid solution is 0.5% to 1% of the mass of the mixture; the mixed mud kneaded into strips has a diameter of 3mm and a length of 5mm;

[0043] (2) Dry the strip-shaped mixe...

Embodiment 2

[0056] A novel biochar prepared by mixing sludge and red soil is prepared by the following method:

[0057] (1) Take the mechanically dewatered sludge with a water content of 85%, add red soil, which is the A0 layer of soil structure, that is, the litter layer within 5cm from the ground surface, and the mass ratio of mechanically dewatered sludge to the red soil is 1: 1. Move it into the oven for drying, the oven drying temperature is 60°C, and the drying time is 84 hours; and grind and sieve through a 200-mesh sieve, add scallop powder, and the added mass is 5% of the mixture mass; then mix with nitric acid solution, the concentration of nitric acid solution 6mol·L -1 , the quality of the nitric acid solution is 0.5% to 1% of the mass of the mixture; the mixed mud kneaded into strips has a diameter of 3mm and a length of 5mm;

[0058] (2) Dry the strip-shaped mixed mud naturally at room temperature for 3 days; then put it into an oven for drying, the oven drying temperature ...

Embodiment 3

[0071] A novel biochar prepared by mixing sludge and red soil is prepared by the following method:

[0072] (1) Take the mechanically dewatered sludge with a moisture content of 80%, add red soil, which is the A0 layer of soil structure, that is, the litter layer within 5cm from the ground surface; the mass ratio of mechanically dewatered sludge to the red soil is 2: 1. Move it into an oven for drying, the oven drying temperature is 60°C, and the drying time is 72 hours; and grind and sieve through a 250-mesh sieve; add scallop powder, and the dosage is 4% of the mass of the mixture; then mix with nitric acid solution, the concentration of nitric acid solution 6mol·L -1 , the mass of nitric acid solution is 0.5-1% of the mass of the mixture; the diameter of the mixed mud kneaded into strips is 2 mm, and the length is 3 mm;

[0073] (2) Dry the strip-shaped mixed mud naturally at room temperature for 2 days, and then put it into an oven for drying. The oven drying temperature ...

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Abstract

The invention discloses a method for preparing novel biochar by mixing sludge and red soil and applications. The preparation method comprises the following steps: mixing excess sludge of a sewage treatment plant with red soil according to a certain ratio, and carrying out drying, high-temperature carbonization and nitric acid modification to prepare the novel biochar with a porous structure, whichcan promote electron transfer and accelerate degradation of organic matters. Both the sludge and the red soil contain rich mineral elements and can provide elements necessary for the growth of microorganisms; particularly, rich iron elements in the red soil can satisfy the requirements of enzymes participating in metabolism in microorganisms; the red soil is acidic, and the sludge is weakly alkaline and has a certain pH buffer capacity, so that the sludge is mixed with the red soil for carbonization, and the neutral pH suitable for microbial growth can be stabilized. The addition of red soilis beneficial to enhancing the strength of the mixed biochar, thereby prolonging the service life and enhancing the recovery rate. According to the method, the sludge and the red soil are used as biochar preparation raw materials, so that the method is green, efficient, cheap and low in preparation cost and has good environmental and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of biochar, and also belongs to the field of fish tank water purification, in particular to a novel biochar prepared by mixing sludge and red soil, a preparation method and an application. Background technique [0002] The construction and operation of sewage plants is accompanied by the generation of a large amount of excess sludge, which usually contains harmful substances such as human pathogenic bacteria and heavy metals, which will cause secondary pollution to the environment and threaten human health. By the end of 2016, the national sewage treatment volume reached 150 million m 3 / d, the amount of sludge produced is based on a water content of 80%, and the total amount is nearly 30 million tons. With the increase in water volume and the upgrading of sewage plants, it is estimated that my country's sludge production will exceed 60 million tons in 2020 (with a water content of 80% ). At present, the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/42A01K63/04
CPCA01K63/04C02F1/283C02F1/42C02F2001/425
Inventor 余丽马磊卫皇曌刘允康李兴发段润斌贺欣
Owner TAIYUAN UNIV OF TECH
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