Modified blue-green algae biochar composite and application thereof to treatment of electroplating wastewater

A technology for composite materials and electroplating wastewater, which is applied in special compound water treatment, water/sewage treatment, metallurgical wastewater treatment, etc., and can solve problems such as odorous anaerobic sludge

Active Publication Date: 2019-09-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the anaerobic reaction can cause

Method used

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  • Modified blue-green algae biochar composite and application thereof to treatment of electroplating wastewater
  • Modified blue-green algae biochar composite and application thereof to treatment of electroplating wastewater
  • Modified blue-green algae biochar composite and application thereof to treatment of electroplating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 Preparation of modified cyanobacteria biochar without loading iron

[0042] A preparation method of modified cyanobacteria biochar, comprising the following steps:

[0043] (1) Place Taihu Lake cyanobacteria in an oven at 105°C for 24 hours, grind and pass through an 80-mesh sieve after drying, then take the sieved sample and mix it with potassium hydroxide. The mass ratio of the sample to potassium hydroxide is 1: 1;

[0044] (2) Under the protection of nitrogen with a gas flow rate of 80sscm, thermally crack the mixed sample. The thermal cracking process is divided into two stages. First, the temperature is raised to 400°C at 5°C / min, and then thermally cracked at 400°C for 90min. Then, the temperature was raised to 800°C at a rate of 10°C / min, and kept at 800°C for 2 hours;

[0045] (3) Put the pyrolyzed sample in a mortar, grind it, pass through a 100-mesh sieve, then pickle it in 1mol / L hydrochloric acid, wash it with water until neutral, put it in a...

Embodiment 2

[0047] The preparation of the modified cyanobacteria biochar composite material of embodiment 2 loaded iron

[0048] A preparation method of modified cyanobacteria biochar composite material, comprising the following steps:

[0049] (1) Dry the Taihu cyanobacteria in an oven at 105°C for 24 hours, grind them after drying, and pass through an 80-mesh sieve. Then get the sample after sieving and mix with potassium hydroxide, the mass ratio of sample and potassium hydroxide is 1:1;

[0050] (2) Under the protection of nitrogen with a gas flow rate of 80sscm, the mixed sample is pyrolyzed. The pyrolysis process is divided into two stages. First, the temperature is raised to 400°C at 5°C / min, and pyrolyzed at 400°C for 90min. , and then heated up to 800°C at a rate of 10°C / min, and kept at 800°C for 2 hours;

[0051] (3) Put the pyrolyzed sample in a mortar, grind it, pass it through a 100-mesh sieve, pickle it in 1mol / L hydrochloric acid, wash it with water until pH=7, put it in...

Embodiment 3

[0055] The processing example of embodiment 3 electroplating waste water

[0056] The materials obtained in the above-mentioned Example 1 and Example 2 were used to treat zinc-nickel alloy electroplating wastewater. The parameters of electroplating wastewater are shown in Table 2.

[0057] The specific treatment process is as follows: First, adjust the initial pH value of the electroplating wastewater to 6, then add 0.5 g of modified cyanobacteria biochar or modified cyanobacteria biochar composite material, and after 20 minutes to reach adsorption equilibrium, add 30 mmol of hydrogen peroxide for Fenton-like oxidation After the reaction (about 60min), sodium hydroxide was added for precipitation, and the supernatant was filtered through a 0.45 μm filter head, and the nickel ion concentration was determined by flame atomic absorption method, and the modified cyanobacteria biochar composite material was desorbed and cleaned. for reuse. The calculation formula of nickel remova...

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Abstract

The invention discloses a modified blue-green algae biochar composite and application thereof to treatment of electroplating wastewater, and belongs to the technical field of preparation of biochar composite preparation. Blue-green algae in Taihu lake are dried, ground and sieved, then mixed with an activating agent and then subjected to thermal cracking to obtain modified blue-green algae biochar; the modified blue-green algae biochar is soaked in an iron-containing solution for further modification to obtain the modified blue-green algae biochar composite. The prepared modified blue-green algae biochar composite has the adsorption and catalysis capacity. The composite can efficiently remove metal ions in the wastewater through adsorption and Fenton-like reaction during the treatment of the electroplating wastewater. The composite is high in stability and can be repeatedly used.

Description

technical field [0001] The invention relates to a modified cyanobacteria biochar composite material, a preparation method thereof and an application in treating electroplating wastewater, belonging to the technical field of biochar composite material preparation. Background technique [0002] In recent years, industries such as aerospace, automotive and jewelry have developed rapidly, so the demand for durable metal materials and related processes has also increased. Electroplating is an indispensable link in the production process of durable metal materials. Through electroplating treatment, the aesthetics and performance of materials can be greatly improved. In 2015, the electroplating industry at home and abroad accounted for about 37% of the total market share of the metal surface treatment industry. Correspondingly, nearly one billion cubic meters of electroplating wastewater will be produced every year. Electroplating wastewater contains copper, chromium, nickel, zin...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/72C02F101/20C02F101/30C02F103/16
CPCC02F1/283C02F1/722C02F1/725C02F2103/16C02F2305/026C02F2101/30C02F2101/20Y02P10/20
Inventor 严群王赫赵辉张勇
Owner JIANGNAN UNIV
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