Multiple element composite metal oxidate arsenic removal settling agent and use method thereof

Abstract

The invention belongs to the material field for removing the arsenic in water by settlement, more particularly relates to polyelement composite metal oxide arsenic removal settlement agent and an application method thereof based on iron oxide, manganese oxide, and aluminum oxide. The invention uses an ectopic preparation method or situ preparation method for preparing and obtaining polyelement composite metal oxide arsenic removal settlement agent which comprises hydrated iron oxide, hydroxyl-hydrated ferric hydroxide, hydrated aluminum oxide, hydroxyl-hydrated alumina, hydrated manganese oxide and the like. The polyelement composite metal oxide arsenic removal settlement agent can be used for removing the arsenic pollutants in water bodies such as lakes, reservoirs, rivers, groundwater, drinking water, industrial waste water, and the like; in addition, the settlement agent can also be used for removing the heavy metals such as copper, chromium, cadmium, lead, and the like, and the pollutants such as iron, manganese, phosphates, and the like in water by settlement.

Description

technical field [0001] The invention belongs to the field of materials for sedimentation and removal of arsenic and other pollutants in water such as lakes and reservoirs, and particularly relates to a multi-component composite metal oxide sedimentation agent for removing arsenic based on iron oxide, manganese oxide and aluminum oxide and an application method. Background technique [0002] Arsenic is a highly toxic heavy metal element, and its presence in the environment will have a serious impact on the human body, aquatic animals and plants. In addition, if arsenic-containing water is used for agricultural irrigation, fishery, landscape and other functional needs, it may also enter the human body indirectly through the enrichment of the food chain and pose a threat to human health. In order to control the risk of arsenic exposure to the human body caused by drinking water, food, vegetables, fruits, aquatic animals (such as fish), etc., my country has strictly regulated th...

AI Technical Summary

Problems solved by technology

[0004] For the sedimentation and removal of arsenic in lakes, reservoirs, rivers and other water bodies, although the above-mentioned adsorption materials used to remove arsenic in drinking water have the ability to adsorb arsenic, they often have low equilibrium adsorption capacity, too fast sedimentation speed, and insufficient adsorption reaction time. , Lack of suitable mixing and other environmental hydraulic conditions, so it is difficult to have obvious arsenic removal effect

The iron-manganese composite oxide / diatomite arsenic-removing adsorption material developed by the applicant in the previous research has effectively improved the adsorption capacity of the material and the kinetic reaction speed of arsenic adsorption, but it is still difficult to effectively settle and remove arsenic in water due to its rapid sedimentation. arsenic

The composite oxidation flocculant invented by the applicant in the early stage can significantly reduce the sedimentation rate in water, but the hydraulic conditions for mixing and reaction are very high in the process of arsenic removal, and it is difficult to apply to the control of arsenic pollution in huge lakes, reservoirs and other water bodies

The iron oxide-alumina composite nanomaterial (patent application number: CN200710118307.1) invented by Cai Yaqi et al. can effectively remove pollutants such as arsenic and fluorine in water, and its low sedimentation rate in water can effectively ensure the reaction of adsorption and sedimentation to remove arsenic time, but the material preparation process is complex and expensive, and it is difficult to apply it on a large scale in engineering practice