Method for adsorption and removal of pentavalent inorganic arsenic in water

Abstract

The invention relates to a method for adsorption and removal of pentavalent inorganic arsenic in water. The method is as follows: 1, a ferrous salt is added into water containing As (V); 2, a carbide material is added into the water containing As (V); and 3, the ferrous salt and the carbide material are evenly mixed in the water. Fe <2 +> is spread and adsorbed on the carbide material surface to complex with carbide material surface groups to provide active adsorption positions for the As (V) in the water, so that efficient adsorption of the As (V) in the water can be realized, and the purpose of efficient removal of the As (V) in the water can be realized. The method does not need expensive and complex metal adsorption material preparation process, and may not produce secondary pollution, the provided method for removal of arsenic can greatly improve the arsenic removal efficiency of a pure carbide material adsorption material, can be used to control the arsenic concentration in groundwater, drinking water, industrial arsenic-containing wastewater and sewage secondary sedimentation tank effluent, and can achieve the national standards.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method for removing As(V) in water. Background technique [0002] Arsenic (As) is a typical pollutant in water, and its pollution problem is mainly reflected in groundwater. Arsenic in nature usually exists in the form of inorganic arsenic (arsenite and arsenate), and also contains a small amount of organic arsenic such as formyl arsenic acid (MMA) and dimethyl arsenic acid (DMA). The order of toxicity of these arsenic compounds from high to low is: inorganic arsenic (Ⅲ)>organic arsenic (Ⅲ)>inorganic arsenic (V)>organic arsenic (V), and the toxicity of trivalent inorganic arsenic As(Ⅲ) is Pentavalent inorganic arsenic is 60 times that of As(V), and it is also the main form of arsenic in groundwater. As(Ⅲ) is easily converted into As(V) through oxidation. Therefore, in the process of water treatment, As(V) It is the main arsenic pollutant to be controlled. [0003] Systema...

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Problems solved by technology

Commercial activated carbon has been reported to have a certain adsorption capacity for As(V), but its ability to remove arsenic is poorer than other adsorption materials such as metal oxides. Therefore, there are few reports on the use of activated carbon to directly adsorb arsenic, and more are deposited on the surface of carbon. The method of metal oxides is used to improve the adsorption capacity of arsenic. However, this method will cause uneven deposition and distribution of metal oxides on the surface of activated carbon, which will make it difficult to fully exert the local accumulation adsorption and adsorption capacity of activated carbon, and is greatly affected by the pH of the system (pH≤ 3 best), reducing the removal of coexisting organic matter, which greatly limits the treatment efficiency and practical application of activated carbon-supported metal oxide materials for arsenic removal

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