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Composite permeable reactive barrier system based on Fe < 0 >-bentonite modified biochar filler and application of composite permeable reactive barrier system

A osmotic reaction wall and biochar technology, applied in biological water/sewage treatment, water pollutants, water/sewage treatment, etc., can solve secondary pollution, endanger human health and other problems, prevent clogging and ensure service life , The effect of high removal rate

Pending Publication Date: 2022-03-29
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, studies have shown that by-products such as nitrite and ammonium ions produced during the nitrate removal process will cause secondary pollution to the groundwater environment and seriously endanger human health.

Method used

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  • Composite permeable reactive barrier system based on Fe &lt; 0 &gt;-bentonite modified biochar filler and application of composite permeable reactive barrier system
  • Composite permeable reactive barrier system based on Fe &lt; 0 &gt;-bentonite modified biochar filler and application of composite permeable reactive barrier system
  • Composite permeable reactive barrier system based on Fe &lt; 0 &gt;-bentonite modified biochar filler and application of composite permeable reactive barrier system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Fe 0 -Bentonite modified biochar layer

[0039] (1) Preparation of Fe 0 -Bentonite modified biochar:

[0040] (a) fully stir and mix bentonite and coconut shell biochar according to the mass ratio of 1:20, the stirring speed is 500r / min, the stirring time is 30min, and then stand still for 48h;

[0041] (b) mix the material in step (a) in N 2 Carry out pyrolysis under the atmosphere, the pyrolysis temperature is 500°C, and the pyrolysis time is 40min to obtain bentonite modified biochar;

[0042] (c) fully stir and mix the bentonite modified biochar and zero-valent iron in step (b), wherein the quality of zero-valent iron is 10% of the biochar quality, the stirring speed is 400r / min, and the stirring time is 40min , get Fe 0 -Bentonite modified biochar.

[0043] Wherein, the particle size of the biochar is 10 mesh, the particle size of the bentonite is 80 mesh, and the particle size of the zero-valent iron is 100 mesh.

[0044] (2) Preparation of Fe loaded wit...

Embodiment 2

[0055] Embodiment 2: a kind of based on Fe 0 -The composite permeable reaction wall system of bentonite modified biochar filler and its preparation method are basically the same as in Example 1, except that:

[0056] 1. Fe 0 -Bentonite modified biochar layer

[0057] (1) Preparation of Fe 0 -Bentonite modified biochar:

[0058] (a) fully stir and mix bentonite and coconut shell biochar according to the mass ratio of 1:15, the stirring speed is 550r / min, the stirring time is 40min, and then stand still for 48h;

[0059] (b) mix the material in step (a) in N 2 Carry out pyrolysis under the atmosphere, the pyrolysis temperature is 550°C, and the pyrolysis time is 50min to obtain bentonite modified biochar;

[0060] (c) Fully stir and mix the bentonite modified biochar and zero-valent iron in step (b), wherein the quality of zero-valent iron is 20% of the biochar quality, the stirring speed is 600r / min, and the stirring time is 50min , get Fe 0 -Bentonite modified biochar. ...

Embodiment 3

[0072] Embodiment 3: a kind of based on Fe 0 -The composite permeable reaction wall system of bentonite modified biochar filler and its preparation method are basically the same as in Example 1, except that:

[0073] 1. Fe 0 -Bentonite modified biochar layer

[0074] (1) Preparation of Fe 0 -Bentonite modified biochar:

[0075] (a) fully stir and mix bentonite and coconut shell biochar according to the mass ratio of 1:10, the stirring speed is 600r / min, the stirring time is 60min, and then stand still for 48h;

[0076] (b) mix the material in step (a) in N 2 Carry out pyrolysis under the atmosphere, the pyrolysis temperature is 600°C, and the pyrolysis time is 60 minutes to obtain bentonite modified biochar;

[0077] (c) fully stir and mix the bentonite modified biochar and zero-valent iron in step (b), wherein the quality of zero-valent iron is 30% of the biochar quality, the stirring speed is 800r / min, and the stirring time is 60min , get Fe 0 -Bentonite modified biocha...

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Abstract

The invention discloses a composite permeable reactive barrier system based on Fe < 0 >-bentonite modified biochar filler and application of the composite permeable reactive barrier system. The composite permeable reactive barrier system is sequentially provided with a quartz sand water inlet layer, a Fe < 0 >-bentonite modified biochar layer, a resin layer and a quartz sand water outlet layer. Wherein an injection well is arranged in the Fe < 0 >-bentonite modified charcoal layer, and the rest part of the Fe < 0 >-bentonite modified charcoal layer is filled with Fe < 0 >-bentonite modified charcoal loaded with microorganisms and quartz sand. The composite permeable reactive barrier disclosed by the invention can realize efficient and lasting removal of chlorinated organics and nitrates in underground water, does not generate secondary pollution caused by degradation by-products, is long in service life, and has a wide application prospect in the field of underground water pollution remediation.

Description

technical field [0001] The invention relates to the technical field of groundwater remediation, in particular to a Fe-based 0 - Composite permeable reactive wall system of bentonite modified biochar filler and its application. Background technique [0002] A survey of groundwater pollution in the United States showed that 44% of groundwater samples contained volatile organic compounds and 28% contained nitrates. Research reports show that the detection rate of organic pollutants in the groundwater of 69 cities in my country is as high as 48.42%, among which chlorinated organic compounds are the main organic pollutant components. In addition, research reports show that the rate of groundwater nitrate exceeding the standard is as high as 39.6% in the black soil region of Northeast China, 19.3% in the fluvo-aquic soil region of North China, and 14.9% in the cinnamon soil region of Northwest China. It can be seen that the pollution of chlorinated organic substances and nitrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/36C02F103/06
CPCC02F9/00C02F2103/06C02F1/001C02F1/281C02F1/705C02F3/34C02F2101/36C02F2101/163
Inventor 张满成刘翠翠王海鑫潘月辜建强
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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