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Heavy metal complex wastewater treatment and recycling process based on iron-based biochar

A wastewater treatment and treatment process technology, applied in water/sewage treatment, adsorption water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of difficult resource utilization and low oxidation efficiency, and achieve high reuse rate and interception The effect of high efficiency and low oxidant utilization

Active Publication Date: 2021-06-18
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a heavy metal complex wastewater treatment based on iron-based biochar and its recycling process, which solves the problems of low oxidation efficiency and difficulty in recycling heavy metals after separation in the prior art , easy to scale up and apply

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  • Heavy metal complex wastewater treatment and recycling process based on iron-based biochar
  • Heavy metal complex wastewater treatment and recycling process based on iron-based biochar
  • Heavy metal complex wastewater treatment and recycling process based on iron-based biochar

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Embodiment 1

[0052] 1. The preparation of iron-based biochar comprises the following steps:

[0053] (1) The rice husk was air-dried naturally, ground and passed through a 100-mesh sieve, placed in a tube furnace, and purified with purified nitrogen for 15 minutes. Under nitrogen conditions, the dried rice husk powder was pyrolyzed at 500 °C for 60 min (flow rate: 200 mL / min). After natural cooling, the obtained black residue was treated with 1 mol / L HCl solution, treated in 1 mol / L NaOH solution, washed repeatedly, and dried in an oven at 60 °C to obtain rice husk biochar (BC).

[0054] (2) Weigh 0.5g BC in (1) and disperse in 200mL 10g / L FeSO 4 ·7H 2 O solution, adjust the pH value of the above solution to 4.5. The mixture was transferred to a continuously stirred reflux apparatus, and 200 mL of 10 g / L NaBH 4 The solution was continuously dropped into the mixed solution, and the stirring was continued for 30 min after the dropwise addition to obtain a mixed solution of iron and bioch...

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Abstract

The invention discloses a heavy metal complex wastewater treatment and recycling process based on iron-based biochar. The heavy metal complex wastewater treatment and recycling process comprises a heavy metal complex wastewater treatment process and a heavy metal recycling process. The heavy metal complex wastewater treatment process comprises the following steps: firstly, adding iron-based biochar into heavy metal complex wastewater to carry out adsorption reaction, then adding an oxidant 1 to carry out catalytic complex breaking reaction, separating residues and purified liquid after the reaction is completed, discharging the purified liquid, and feeding the residues to the heavy metal resourceful treatment process. The heavy metal resourceful treatment process comprises the following steps: leaching residues with a leaching solution to obtain activated iron-based biochar and a heavy metal-containing waste liquid, reutilizing the activated iron-based biochar, adding an oxidizing agent 2 into the heavy metal-containing waste liquid to carry out an oxidation reaction, then adjusting the pH value, separating the residues and a supernatant, and evaporating the supernatant to dryness to obtain high-purity heavy metal salt. The process solves the problems of low oxidation efficiency and difficulty in recycling after heavy metal separation in the prior art, and is easy for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an iron-based biochar-based heavy metal complex wastewater treatment and resource recovery process. Background technique [0002] In recent years, the potential adverse effects of Cd(II) and Cd-EDTA organic derivatives on the ecological environment and human safety have attracted widespread attention (Sun et al., 2020; Zhao et al., 2017). To meet increasingly stringent wastewater discharge standards, efficient purification of Cd(II) wastewater is considered to be one of the major challenges (Li et al., 2020). Cd(II) has been removed from wastewater by techniques such as adsorption, ion exchange, chemical precipitation, and coagulation (Vikrant et al., 2019). Therefore, adsorption is an effective and flexible method for the treatment of trace pollutants. In addition, heavy metal organic derivatives (such as Cd-EDTA) usually do not exist in ionic form, which limits t...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01J20/20B01J20/30C01G11/00C02F1/28C02F1/72C02F101/20
CPCC02F1/283C02F1/725B01J20/20C01G11/00C02F2303/16C02F2101/20B01J2220/4825
Inventor 陈润华程钰莹兰志强董淮海吴灵蕴王娇李四海
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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