Application of fixed Lentinus edodes prosthecae to heavy metal cadmium pollution

A technology of mushroom stem and heavy metal, which is applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. The problem of high cost, to achieve the effect of wide use, avoid secondary pollution, good stability

Inactive Publication Date: 2013-03-06
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These treatment methods can be generally divided into two categories: (1) heavy metals are converted into insoluble compounds, such as hydroxide precipitation method, etc., this type of method is widely used, the operating cost is higher and it is difficult to recycle heavy metals; (2) ) The heavy metals in wastewater can be concentrated and separated without changing their forms, such as evaporation concentration and adsorption. This method has high technical requirements and operating costs. Although it is easy to recover heavy metals, most of the other concentrated products are It is difficult to recycle, so further harmless treatment (such as cement curing, sintering curing, asphalt curing, etc.) is required to make heavy metals difficult to leach and prevent re-pollution of the environment
Both types of methods have some common disadvantages, that is, high operating costs and raw material costs. Due to these disadvantages, the traditional methods of treating heavy metal pollution in water bodies are not suitable for large concentrations below 100mg·L-1 It is very economically uneconomical when the low-concentration heavy metal wastewater

Method used

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  • Application of fixed Lentinus edodes prosthecae to heavy metal cadmium pollution
  • Application of fixed Lentinus edodes prosthecae to heavy metal cadmium pollution
  • Application of fixed Lentinus edodes prosthecae to heavy metal cadmium pollution

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Experimental program
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Effect test

Embodiment 1

[0037] Laboratory test:

[0038] Preparation of the biological components of the adsorption material: cut off and wash the non-edible part of the stipe of the mature fruiting body of the mushroom attached to the culture medium, dry it in a constant temperature drying oven at 50±2°C to constant weight, take it out and cool it, and crush it with a pulverizer Finally, as the biological component of the adsorption material, put it into a jar and set aside.

[0039] Cd 2+ Preparation of adsorbent: Use polyvinyl alcohol-sodium alginate (PVA-SA) to fix the stipe of Lentinus edodes as an adsorbent, weigh 5 g PVA and 1 g SA, pour them into a beaker with 100 mL of distilled water, heat and stir to dissolve, Cool to 50°C, add 3 g of shiitake mushroom powder to make the bacterial powder concentration 3% (w / v), mix well to form a mycoalgal alcohol mixture. Use a syringe equipped with a 7-9 gauge needle to squeeze the bacteriophyll mixture into the 2% CaCl 2 Saturated H 3 BO 3 In the...

Embodiment 2

[0070] In sewage containing heavy metal cadmium, the measured Cd of sewage 2+ The concentration was 25 mg / L, and polyvinyl alcohol-sodium alginate (PVA-SA) was used to immobilize the mushroom stipe as the adsorbent 35 g to prepare a fixed-bed reactor. The fixed-bed reactor was a cylinder with a column length of 20 cm. The diameter is 5.1 cm, and the bed height is 80 mm. The fixed bed reactor is used to adsorb the heavy metal cadmium in the sewage. The speed of the sewage passing through the fixed bed reactor is 10 mL / min to remove the heavy metal cadmium in the wastewater. 2+ The adsorption capacity is 1.21 mg / kg, and the Cd in the sewage after adsorption 2+ The concentration reaches the emission standard required by the state.

[0071] Then, 0.01 mol / L HCl is used to analyze the adsorbed heavy metals. After the fixed mushroom stipe is resolved in the treated sewage, the sewage containing heavy metal cadmium can be adsorbed again.

Embodiment 3

[0073] In sewage containing heavy metal cadmium, the measured Cd of sewage 2+ The concentration is 45 mg / L, using polyvinyl alcohol-sodium alginate (PVA-SA) to immobilize the mushroom stipe as the adsorbent 35 g to prepare a fixed-bed reactor, the fixed-bed reactor is a cylinder with a column length of 20 cm, The diameter is 5.1 cm, and the bed height is 80 mm. The fixed bed reactor is used to adsorb the heavy metal cadmium in the sewage. The speed of the sewage passing through the fixed bed reactor is 10 mL / min to remove the heavy metal cadmium in the wastewater. 2+ The adsorption capacity is 1.65 mg / kg, and the Cd in the sewage after adsorption 2+ The concentration reaches the emission standard required by the state.

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Abstract

The invention relates to the technical field of treatment on waste water containing heavy metal cadmium, in particular to an application of fixed Lentinus edodes prosthecae to heavy metal cadmium pollution. A method of the application comprises the following steps of adopting the fixed Lentinus edodes prosthecae as an adsorbent in sewage containing the heavy metal cadmium, preparing a fixed bed reactor with the adsorbent, utilizing the fixed bed reactor to adsorb the heavy metal cadmium in the sewage for the removal of the heavy metal cadmium, and then resolving the adsorbed heavy metal for a purpose that the fixed Lentinus edodes prosthecae can adsorb the sewage containing the heavy metal cadmium again after the resolving. With the adoption of the fixed bed reactor for treatment on the heavy metal waste water, the operation is simple, the stability is good and the treatment effect is good; moreover, post-fixed biological dead bodies are adopted as carriers in the bed, so that operations such as aeration are unnecessary; therefore, the use is wide; and the resolving of the biological adsorbent adsorbing heavy metal ions not only can prevent the secondary pollution, but also can enable the heavy metal to be recovered, so that the metal resource is saved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment containing heavy metal cadmium, in particular to the application of fixing the stipe of shiitake mushrooms to pollution of heavy metal cadmium. [0002] Background technique [0003] In recent years, with the rapid development of global industry and the massive discharge of waste water, the pollution of many heavy metals to the environment has become increasingly serious. How to effectively control heavy metal pollution has become a common concern of mankind. This topic is oriented to the research of efficient and economical heavy metal wastewater treatment technology, with the goal of resource utilization of waste organisms. 2+ The research on the way of capacity, focused on the technical feasibility of using fixed-bed reactor with fixed-bed mushroom stipe as adsorbent to adsorb and remove heavy metals in wastewater, and studied the adsorption-desorption of Cd 2+ Conditions, to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 李伟张丹李付杰
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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