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Fermentation-modified composite biochar for urban sewage treatment and preparation method thereof

A technology of urban sewage and biochar, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc. Uniformity and other issues, to achieve the effect of many adsorption active sites, cheap raw materials, and high adsorption efficiency

Active Publication Date: 2022-04-22
ZHEJIANG UNIV OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a common adsorbent, biochar is rich in raw materials. Its adsorption is mainly based on the physical adsorption of its large specific surface area. its development in various fields
The common modification method of biochar is to use nitric acid oxidation to increase oxygen-containing functional groups, but this method is more polluting, dangerous and the modification effect is limited

Method used

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  • Fermentation-modified composite biochar for urban sewage treatment and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the preparation one of biochar:

[0028] Raw material pretreatment: cut 150g of fresh lotus leaves into small pieces of about 3cm, cut 80g of fresh knotweed into small pieces of about 7cm, then dry the petiole of lotus leaf at 70°C for 2h, and then add knotweed , after the two are blended, dry at a temperature of 70°C until the water content of the petiole of the lotus leaf and the knotweed is lower than 25%;

[0029] The fresh lotus leaf petiole has more water content, so the drying time is longer than that of knotgrass. After mixing the two, dry it until the water content is lower than 25%. Next step.

[0030] Fermentation: Mix the pretreated lotus leaf petiole and knotweed with 40g of 2cm corn stalks and 30g of peanut shells to obtain a mixture, and spray the polyphenol oxidase solution with a concentration of 0.8U / g on the mixture. Stir evenly until the water content is 45%, then ferment for 18 days in an environment with a temperature of 18-20°C and...

Embodiment 2

[0036] Embodiment 2: the preparation two of biochar:

[0037] Raw material pretreatment: cut 200g of fresh lotus leaves into small pieces of about 3cm, cut 100g of fresh knotweed into small pieces of about 7cm, then dry the petiole of the lotus leaf at 70°C for 2 hours, and then add knotweed , after the two are blended, dry at a temperature of 70°C until the water content of the petiole of the lotus leaf and the knotweed is lower than 25%;

[0038] Fermentation: Mix the pretreated lotus leaf petiole and knotweed with 40g of 3cm corn stalks and 30g of peanut shells to obtain a mixture, and spray the polyphenol oxidase solution with a concentration of 0.9U / g on the mixture. Stir evenly until the water content is 45%, then ferment for 18 days in an environment with a temperature of 20-22°C and a humidity of 72-74%, turn over every 6 days, and oxidize the fermented mixture with 1wt% hydrogen After soaking in sodium solution for 35min, wash twice with 3wt% hydrogen peroxide, filte...

Embodiment 3

[0042] Embodiment 3: the preparation three of biochar:

[0043] Raw material pretreatment: cut 250g of fresh lotus leaves into small pieces of about 4cm, cut 50g of fresh knotweed into small pieces of about 10cm, then dry the petiole of the lotus leaf at 75°C for 2 hours, and then add knotweed , after the two are blended, dry at a temperature of 70°C until the water content of the petiole of the lotus leaf and the knotweed is lower than 25%;

[0044] Fermentation: Mix the pretreated lotus leaf petiole and knotweed with 50g of 3cm corn stalks and 20g of peanut shells to obtain a mixture, and spray the polyphenol oxidase solution with a concentration of 1U / g on the mixture until The water content is 48%, stirred evenly, then fermented in an environment with a temperature of 21-23°C and a humidity of 73-75% for 18 days, turning over every 6 days, and using 1wt% sodium hydroxide to ferment the mixture After the solution was soaked for 40 minutes, it was washed twice with 3wt% hyd...

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Abstract

The invention discloses fermented modified composite biochar for urban sewage treatment and a preparation method thereof, belonging to the technical field of environmental protection. The fermented modified composite biochar is fermented with lotus leaf petiole and knotweed as main raw materials The prepared porous biochar, the surface of the porous biochar is covered with xerogel, the xerogel is a mixture of polyacrylamide gel and silica gel, and the particle size of the fermentation modified composite biochar is 2 ‑3mm, pore diameter 15‑30nm, porosity 70‑75%, specific surface area 500m 2 / g. The purpose of the present invention is to provide fermented modified composite biochar for urban sewage treatment and its preparation method. The prepared biochar has a well-developed pore structure, many adsorption active sites, good adsorption effect, and can realize the removal of harmful substances such as heavy metal ions in sewage. The high-efficiency removal of biochar, and the raw material of biochar is mainly the petiole of lotus leaf, which can be used as waste, saves cost and protects the environment.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to fermentation-modified composite biochar for urban sewage treatment and a preparation method thereof. Background technique [0002] With the improvement of people's living standards in our country and the rapid acceleration of urbanization, various waste water such as industrial waste water, domestic sewage, and urban sewage are increasingly produced. Since sewage contains a large amount of metal elements and metal ions, such as zinc, chromium, cadmium, copper, etc., as well as inorganic substances such as alkali, sulfide, and salts, etc., it is very polluting. If it is directly entered into the aquatic ecosystem Microorganisms not only cannot reduce the concentration of heavy metals, but can enrich and amplify their effects on the contrary. After heavy metals enter the organism, they can accumulate in certain organs and cause cumulative poisoning, which eventually...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/261B01J20/20B01J20/3085C02F1/283C02F2101/20
Inventor 鲁仕宝高学睿李蔚曾辉邓晓军
Owner ZHEJIANG UNIV OF FINANCE & ECONOMICS
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