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Method for synchronously removing nitrobenzene and vanadate in water environment through electrical stimulation, and inoculum

A technology of nitrobenzene and inoculum, applied in the field of environmental management, can solve problems such as the inability to remove NB very effectively

Active Publication Date: 2021-08-24
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the strong toxicity of NB, the traditional in situ bioremediation technology cannot remove NB very effectively. Therefore, there is an urgent need for efficient methods to deal with the combined pollution of NB and V(V) in the environment.

Method used

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  • Method for synchronously removing nitrobenzene and vanadate in water environment through electrical stimulation, and inoculum
  • Method for synchronously removing nitrobenzene and vanadate in water environment through electrical stimulation, and inoculum
  • Method for synchronously removing nitrobenzene and vanadate in water environment through electrical stimulation, and inoculum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1, experimental material and chemical reagent

[0067] Experimental Materials

[0068] In the experiment of microbial degradation of nitrobenzene and vanadate under electrical stimulation, four 250mL serum bottles wrapped in tin foil were prepared as batch experiment bioreactors, and 200mL of synthetic groundwater (as shown in Table 1) and 50mL of inoculated sludge, the cathode and anode are made of 1cm×1cm×0.5cm carbon felt, and the carbon felt is fixed with a diameter of 1mm titanium wire. , one end is clamped to the output port of the constant power supply, and the constant power supply is adjusted to the specified voltage to run the reactor. All reactors were incubated in the dark at 25±2°C, and the experimental water was ultrapure water. The inoculum sludge was the sediment collected from the vanadium-contaminated site in Panzhihua.

[0069] Table 1 Groundwater composition

[0070]

[0071] chemical reagent

[0072] NBs were purchased from Sigma,...

Embodiment 2

[0077] Voltage optimization feasibility study

[0078] Bioresponse using different voltages, namely 0.3V, 0.6V, 0.9V and 1.2V, and synthetic groundwater containing ethanol at an initial concentration of 10mg / L NB and V(V) at an initial concentration of 10mg / L and COD at an initial concentration of 100mg / L The machine was acclimatized for 20 operating cycles, and the water was changed every 48 h to evaluate the optimal voltage-synchronized NB biodegradation and V(V) bioreduction process. The removal effect of NB and V(V) was monitored during the acclimatization phase. When the removal effects of NB and V(V) in all reactors were stable, the next experiment was carried out with an operation period of 48h.

[0079] After the acclimatization of the reactor was completed, the removal performance of NB and V (V) was evaluated in three consecutive reaction cycles (each operation cycle was 48h). The concentration levels of NB and V (V) remained the same as those in the previous accli...

Embodiment 3

[0096]Example 3, Feasibility study of biodegradation of NB and reduction of V(V) under different voltage stimuli

[0097] After 20 cycles of acclimatization experiments, in four bioreactors with different voltages applied, such as figure 1 a in and figure 1 As shown in b) in , most of NB is removed, and V(V) is almost completely removed. Ethanol containing NB at an initial concentration of 10 mg / L and V(V) at an initial concentration of 10 mg / L and COD at an initial concentration of 100 mg / L was added to the bioreactor. After that, all the reactors were run continuously for 3 cycles at the same time. At the end of the cycle, 10 mL of solution was drawn from each reactor to detect the concentrations of NB and V (V). Such as figure 1 As shown in c, the NB removal rate reached 94.3±1.32% within 48h when 0.6V was applied, which was higher than that of 0.3V (91.0±1.67%), 0.9V (89.6±1.15%) and 1.2V (91.6 ±1.37%) removal rate. Appropriate electrical stimulation can promote micro...

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Abstract

One or more embodiments of the invention relate to the technical field of environmental governance, in particular to a method for synchronously removing nitrobenzene and vanadate in a water environment through electrical stimulation, and an inoculum. The method comprises the following steps: inoculating the inoculum into a bioreactor, wherein the inoculum is a sediment of a Panzhihua vanadium-polluted site; carrying out domestication on the inoculum; and injecting first synthetic underground water at least containing nitrobenzene, pentavalent vanadium and a carbon source into the bioreactor containing the domesticated inoculum, and carrying out a synchronous removal reaction on nitrobenzene and pentavalent vanadium under stimulation of a voltage of 0.3-1.2 V, wherein the synchronous removal reaction is carried out for at least 48 hours, and during the synchronous removal reaction, an anaerobic environment is kept in the bioreactor. According to the above scheme, nitrobenzene and pentavalent vanadium in the water environment can be stably, efficiently and simultaneously removed.

Description

technical field [0001] One or more embodiments of this description relate to the technical field of environmental governance, and in particular to a method and an inoculum for synchronous removal of nitrobenzene and vanadate by electrical stimulation in a water environment. Background technique [0002] With the rapid development of the economy, human needs are increasing, and the discharge of waste gas and wastewater is increasing. Untreated wastewater is artificially discharged into the environment, making the environment contain a large amount of organic matter and heavy metals, which is harmful to human health and ecosystem stability. constituted a threat. [0003] Nitroaromatic compounds (NACs) are important components of refractory heterogeneous organisms and have been widely used in dyes, pigments, drugs, pesticides, rubber chemicals, engineering plastics, explosives, and other fields. Nitrobenzene (NB), as a kind of NACs, is widely produced as explosives, pesticides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/00C12N1/36C02F1/48C02F101/20C02F101/34C02F101/38C02F103/06
CPCC12N1/36C02F3/34C02F3/006C02F1/48C02F2103/06C02F2101/38C02F2101/34C02F2101/20C02F2305/06
Inventor 张宝刚李宗岩
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)