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Preparation of biochar by mixing sludge and red soil, preparation method and application

A biochar and red soil technology, applied in the fields of application, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of difficult sludge disposal, difficult cultivation of acidic soil, easy pollution of fish tank water quality, etc., to achieve extended replacement Effects of water cycling, increasing soil exchangeable base cation content, enhanced performance

Active Publication Date: 2021-10-15
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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  • Preparation of biochar by mixing sludge and red soil, preparation method and application
  • Preparation of biochar by mixing sludge and red soil, preparation method and application
  • Preparation of biochar by mixing sludge and red soil, preparation method and application

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Effect test

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 and application for preparing new biochar by mixing sludge and red soil. The preparation method is to mix residual sludge from a sewage treatment plant with red soil in a certain proportion, and then dry, high-temperature carbonization and nitric acid modification to prepare porous biochar. A new type of biochar with a structure that can promote electron transfer and accelerate the degradation of organic matter. Both sludge and red soil are rich in mineral elements, which provide elements necessary for microbial growth, especially the rich iron in red soil can meet the needs of enzymes involved in the metabolism of microorganisms; red soil is acidic, and sludge is weakly alkaline And it has a certain pH buffer capacity, and carbonization after mixing can stabilize the neutral pH suitable for microbial growth. The addition of red soil helps to increase the strength of the hybrid biochar, resulting in a longer lifespan and higher recovery. The invention uses sludge and red soil as raw materials for biochar preparation, is green, efficient and cheap, has low 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 Patents(China)
IPC IPC(8): B01J20/20C02F1/28C02F1/42A01K63/04
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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