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Method for removing heavy metal in water by utilizing plant-biomass composite adsorbent

A plant biomass and composite adsorption technology is used in the field of plant biomass composite adsorbents to adsorb heavy metals from water bodies and recover them, which can solve the problems of refractory degradation, high treatment costs, heavy secondary pollution, etc. effect, high adsorption efficiency

Inactive Publication Date: 2012-07-18
靖德兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) Hard to degrade
Heavy metals cannot be degraded, and can only maintain stability or reduce toxicity by changing their valence and compound type; however, under the action of microorganisms, they may also be converted into more toxic organic compounds, such as inorganic mercury in natural water bodies, which can be destroyed Microbes convert to more toxic methylmercury
[0006] (3) Easy to enrich
[0007] (4) Toxicity for a long time
The methods for treating heavy metal wastewater mainly include chemical precipitation, oxidation-reduction, electrolysis, ion exchange, membrane separation, evaporation concentration, air flotation, etc. These methods are expected to obtain better treatment effects, but there are generally heavy secondary pollution and high treatment costs. , small application scale, poor treatment effect on low-concentration heavy metals, etc., so it is difficult to achieve large-scale application in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The contents of Cu, Zn, Ni, Mn, Cd, Pb, Cr, Hg, Al, Au and Ag are all 20mg L -1 In the compound heavy metal-contaminated solution, the composite adsorbent composed of chestnut peel, rice straw and cattail according to the optimized formula (mass share 20%: 40%: 40%) was added at a mass concentration ratio of 1:100. -1 Shake for 3h under certain conditions. As a result, the formula achieves high-efficiency adsorption of complex heavy metal pollution, with a removal rate of more than 90%, and the total metal content in the adsorbent is about 1.5% to 2% or more (the content of Cu, Zn, Ni and other metals reaches 0.2% to 0.5%) ).

[0033]Refer to "Code for Geological Exploration of Copper, Lead, Zinc, Silver, Nickel, Molybdenum Ore (DZ / T 0214-2002)" - Appendix G "General Principles and Reference Indexes for the Development of Ore Deposit Industry Bidding", "General Copper Deposit Industry Index "Requirements" stipulates that the cut-off grade and minimum industrial grade ...

Embodiment 2

[0035] At a Cd content of 50mg L -1 In the solution polluted by a single heavy metal, a composite adsorbent composed of chestnut peel, straw, and cattail was added according to the optimized formula (20%:72%:8%) at a mass concentration ratio of 1:200. -1 Shake for 0.5h under certain conditions. As a result, the formula achieves efficient adsorption of cadmium, the removal rate reaches 80-90% or more, and the cadmium content in the composite material reaches more than 0.09%.

[0036] Cadmium (Cd) is a low-content, highly dispersed dispersed element mineral in the earth's crust, and it is difficult to form independent deposits. The chemical properties of Cd are similar to those of Zn in many respects, and both have similar geochemical behaviors in nature - cadmium often occurs in sphalerite (mainly composed of ZnS) in the form of isomorphism, so cadmium is mainly used as lead Mining and utilization of associated elements in zinc ore. Refer to "Code for Geological Exploration ...

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PUM

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Abstract

The invention relates to a method for removing heavy metal in water by utilizing a plant-biomass composite adsorbent. The method belongs to the technical field of environment protection. According to the invention, adsorbing materials including chestnut skin, biomass (such rice straws) of overground parts of rice, and plant biomass of overground parts of the cattail are combined together and matched in certain proportion to form the composite adsorbent, wherein the adsorbing materials are low in cost and wide in resource and have peculiar adsorbability on the heavy metal. The composite adsorbent has better adsorbability on ions of 11 metals including copper, zinc, lead, nickel, manganese, cadmium, chromium, mercury, aluminium, gold and silver in wastewater; the high-concentration water heavy metal removing rate of the plant-biomass composite adsorbent can reach 95% or more, and the middle-concentration water heavy metal removing rate of the plant-biomass composite adsorbent is expected to reach 80%-90% or more; and the heavy metal content of the adsorbed composite adsorbent reaches the index of a deposit industry, thus becoming a high-quality biomass mineral resource.

Description

technical field [0001] The invention relates to the fields of waste water ecological treatment and mineral resource development, in particular to a method for absorbing and recovering heavy metals from water using a plant biomass composite adsorbent. Background technique [0002] After more than 30 years of economic development and industrial prosperity, my country has been hailed as the "world factory" - not only consuming huge amounts of resources and energy, but also emitting a lot of pollution to the environment. Taking iron ore resources as an example, the international market is basically dominated by Brazil's Vale (CVRD Vale, the world's largest iron ore producer and exporter, and the largest mining company in the American continent), Rio Tinto (RIO TINTO, the world's No. The second largest iron ore supplier, China's largest iron ore importer), BHP Billiton (bhpbillition, the world's third largest iron ore supplier) monopoly, in recent years with the rapid growth of my...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62
Inventor 靖德兵
Owner 靖德兵