Patent•
Preparation method and application of multi-site activated and modified reed-lutarioriparius biochar
15 Oct 2019-
TL;DR: In this paper, a preparation method of multi-site activated and modified reed-lutarioriparius biochar and application thereof to removal of heavy metals zinc and cadmium was proposed.
Abstract: The invention relates to the field of treatment to heavy metal pollution in water and soil, in particular to a preparation method of multi-site activated and modified reed-lutarioriparius biochar andapplication thereof to removal of heavy metals zinc and cadmium. The preparation method comprises the following steps: firstly washing, drying and crushing reed-lutarioriparius biomass, ultrasonicallystirring in an aqueous manganese ore powder solution thoroughly, then performing low-temperature hydrothermal carbonization to produce unactivated and unmodified biochar, then soaking the biochar ina calcium chloride-hydrogen peroxide mixed solution, activating a biochar-calcium chloride-hydrogen peroxide mixed solution by using microwave, and then modifying the dried biochar through ultravioletradiation to obtain activated and modified biochar, wherein the obtained biochar is applied to the removal of the heavy metals zinc and cadmium in the water and the soil. An application method comprises the following steps: adding the activated and modified biochar into heavy metal zinc and cadmium wastewater for an adsorption reaction; or directly adding into heavy metal zinc and cadmium contaminated soil, thoroughly mixing uniformly, and aging for a period of time to complete bioremediation of heavy metal zinc and cadmium pollution in the soil.
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Patent•
16 Oct 2020
TL;DR: In this article, a preparation method of a soil remediation agent is described. But the preparation method comprises the following steps: collecting industrial waste manganese-containing ore and biomass; subjecting the manganous-containing mined ore to acid pickling, grinding and screening to obtain manganized ore powder with the particle size smaller than or equal to 200 meshes.
Abstract: The invention relates to a preparation method of a soil remediation agent. The preparation method comprises the following steps: collecting industrial waste manganese-containing ore and biomass; subjecting the manganese-containing ore to acid pickling, grinding and screening to obtain manganese-containing ore powder with the particle size smaller than or equal to 200 meshes; carrying out alkali excitation on the manganese-containing ore powder by adopting an alkali activator; subjecting the biomass to cutting, grounding and screening to obtain biomass powder with the particle size ranging from40 meshes to 60 meshes; mixing the biomass powder with the alkali-activated manganese-containing ore powder, adding deionized water, and allowing an obtained mixture to stand at 20-50 DEG C for transition; drying the mixture after being transferred, and subjecting the dried mixture to activation through heat treatment. The invention further relates to the soil remediation agent and application thereof.
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Patent•
30 Jun 2010TL;DR: In this paper, a mixture of activated carbon and activated metal salts is used to generate free radicals, which oxidizes the contaminant adsorbed onto the composite to remove the contaminants from the wastewater.
Abstract: A composition as adsorbent and catalyst is manufactured by adding activated carbon into a aqueous solution comprising a plurality of metal salts, adjusting the solution to a predetermined pH value according to the types of the plurality of metal salts, drying the solution while slowly stirring at the same time, and calcining a product from the dried aqueous solution so as to obtain the composite as adsorbent and catalyst. The said composite can be used in a wastewater treatment method. The wastewater treating method comprises the steps of adding the said composite to wastewater comprising a contaminant, such that the contaminant is adsorbed onto the composite; and adding an oxidant to the wastewater. The oxidant is catalyzed by the composite to generate free radicals, which oxidizes the contaminant adsorbed onto the composite to thereby remove the contaminant from the wastewater.
12 citations
Patent•
30 Dec 2015
TL;DR: In this paper, a modified walnut shell active carbon adsorbent and a preparation method of the modified WSH was provided. But the preparation method was not described. But it was shown that the WSH can be widely used in natural water and industrial sewage and wastewater for removing the heavy metal ions.
Abstract: The invention provides a modified walnut shell active carbon adsorbent and a preparation method thereof. The preparation method of the modified walnut shell active carbon adsorbent comprises the following steps: drying crushed and sieved walnut shell powder in a drying oven till constant weight is realized, weighing a proper amount of soft manganese ore powder, adding the soft manganese ore powder into the walnut shell powder, chemically activating the walnut shell powder by using H3PO4, soaking and activating the walnut shell powder in a phosphoric acid solution for 18-24 hours, then burning and carbonizing at high temperature, cooling the walnut shell powder to the room temperature, washing with water till to neutral, drying the walnut shell powder in the drying oven, grinding and sieving to prepare the modified walnut shell active carbon adsorbent. Compared with the ordinary walnut shell active carbon, the adsorbent is high in removal rate of heavy metal ions such as copper, lead and chromium; the adsorption capacity is high; the raw materials for preparing the adsorbent are wide in sources and low in cost; the adsorbent can be widely used in natural water and industrial sewage and wastewater for removing the heavy metal ions.
8 citations
Patent•
24 May 2017
TL;DR: In this article, a preparation method of a composite biomass improver for remedying heavy metal-polluted soil is presented, which includes the following steps: with agricultural waste as a raw material, washing, drying, grinding and screening; soaking in an alkaline solution; after the soaking, washing with dilute acid or water to neutrality; oxidizing with an oxidizing agent such as ozone, hydrogen peroxide or potassium permanganate; with phosphate or phosphate ester as a crosslinking agent and distilled water as a dispersing agent, performing a phosphorylation addition
Abstract: The invention discloses a preparation method of a composite biomass improver for remedying heavy metal-polluted soil. The method comprises the following steps: with agricultural waste as a raw material, washing, drying, grinding and screening; soaking in an alkaline solution; after the soaking, washing with dilute acid or water to neutrality; oxidizing with an oxidizing agent such as ozone, hydrogen peroxide or potassium permanganate; with phosphate or phosphate ester as a crosslinking agent and distilled water as a dispersing agent, performing a phosphorylation addition reaction; filtering after complete phosphorylation addition reaction; compounding the phosphorylated biomass with calcium salt by a solution blending method; heating and stirring till complete reaction; filtering and separating out solid materials; washing with a sodium chloride solution and deionized water to neutrality; and drying to obtain a composite biomass improver. The invention has the characteristics of simple preparation method, low cost, no secondary pollution and the like and also solves two major problems of agricultural waste stacking and farmland heavy metal pollution.
7 citations
Patent•
12 Jun 2018
TL;DR: In this paper, a heavy metal-polluted soil passivating agent has been applied into soil, which has the characteristics that the specific surface area is large, the structure is stable, the cation exchange ability is strong, and the like.
Abstract: The invention relates to a heavy metal-polluted soil passivating agent and a preparation method thereof, and belongs to the technical field of soil improvement. The heavy metal-polluted soil passivating agent has the characteristics that the specific surface area is large, the structure is stable, the cation exchange ability is strong, and the like; after the passivating agent is applied into soil, the chelating ability of organic matter, iron/aluminum oxide and clay mineral in the soil is enhanced by increasing the pH (potential of hydrogen) value in the soil, the adsorbing ability of the soil is enhanced, the desorbing ability of the heavy metal is reduced, the content of soluble metals in the soil is finally reduced, the heavy metal ions in the soil are promoted to be converted into hydroxide or carbonate precipitate, such as precipitate with smaller dissolvabilitying degree, and the bioavailability of the heavy metal is reduced; plant ash is impregnated by with a wood vinegar liquid, the nutritional components are dissolved and activated, the wood vinegar liquid reacts with alkaline oxide in modified attapulgite, the nutritional components are effectively coated and adsorbed into activated biomass charcoal to slowly release, the fertility of the soil is effectively improved, the original ecology function of crops is restored, and the survival rate of tree planting and the output of agricultural products are increased.
6 citations
Patent•
07 Jul 2017
TL;DR: In this article, a process for improving biochar oxygen-containing groups through cooperation of hydrogen peroxide and ultraviolet radiation is described, which is mainly characterized by sieving, washing and drying a prepared biochar material.
Abstract: The invention relates to a process for improvement of biochar oxygen-containing groups through cooperation of hydrogen peroxide and ultraviolet radiation The process is mainly characterized by: sieving, washing and drying a prepared biochar material, then performing soaking with hydrogen peroxide, conducting magnetic stirring, then performing filtering, and maintaining the existence of hydrogen peroxide on the biochar surface, then spreading the biochar material flatly on a temperature control electric hot plate, conducting ultraviolet radiation lamp irradiation within a wavelength range of 10-380nm for 24h, maintaining the biochar at a temperature of 200DEG C during irradiation, and turning over the biochar every 12h, also spraying hydrogen peroxide again to maintain that atomized hydrogen peroxide always exists on the biochar surface, and carrying out drying at the end of ultraviolet irradiation The process provided by the invention can significantly increase the number of biochar material's oxygen-containing groups
3 citations