Method for preparaing dephosphorized and ferrum-carried activated carbon adsorbent

Abstract

The invention belongs to the technical field of sewage treatment, in particular to a method for preparaing dephosphorized and ferrum-carried activated carbon adsorbent, which comprises the following steps of: soaking powdered activated carbon through hydrochloric acid, washing through water, and drying at the temperature of 100-150 DEG C; injecting the obtained activated carbon into strong oxidizing acid solution so as to be soaked, rinsing, and drying a rinsed sample; and finally, mixing the obtained activated carbon and inorganic ferric salt solution, stirring, re-drying, cooling to room temperature, removing surface layer coverings, washing unloaded ferric oxide through water until rinsing to be without obvious color and without red color through test by potassium rhodanide solution, and drying continuously to obtain the high-efficient dephosphorized activated carbon adsorbent rich in iron oxide compound. Compared with the prior art, the method has the advantages of simplicity, moderate preparing condition, easiness in implementation, strong operability, high processing efficacy for waste water containing phosphorus, and purification cost reduction.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a preparation method of a modified activated carbon adsorbent. Background technique [0002] At present, domestic and foreign wastewater phosphorus removal technologies are mainly divided into two categories: biological phosphorus removal and physical and chemical phosphorus removal. Phosphorus removal by physicochemical method can be divided into chemical precipitation method, electrocoagulation method, crystallization method, adsorption method and so on. Among them, adsorption phosphorus removal technology has become a research hotspot in the treatment of phosphorus-containing wastewater due to its easy operation, high efficiency and rapidity, no secondary pollution, recyclability, abundant active sites of the adsorbent, and low cost. [0003] The adsorption phosphorus removal technology is to use some porous or large specific surface area substances to re...

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Problems solved by technology

Chinese patent, publication number is that CN102247804A discloses the preparation method of the activated carbon fiber phosphorus removal agent loaded with lanthanum hydroxide; Chinese patent, publication number is that CN102008940A discloses the preparation method of the activated carbon fiber phosphorus removal agent that is loaded with lanthanum oxide; The prepared phosphorus removal agents all show good adsorption effect, but the metal oxides used in the preparation process are lanthanum oxide and lanthanum hydroxide, which are expensive, which increases the cost of modified activated carbon

Chinese patent, publication number is CN101757892A discloses the preparation method of bagasse activated carbon / iron oxide, the obtained finished product is used for the adsorption of phosphorus, has obtained good effect, this invention has reduced the production cost of adsorbent, but the mixture of activated carbon and iron oxide in the preparation process High-temperature carbonization treatment is required at 400~600°C, which requires high preparation conditions and has a certain carbon loss rate.

[0005] 1) Co-precipitation method is adopted, and iron sulfate or chloride is used as a modified substance to mix with activated carbon. The iron-loaded activated carbon prepared under high pH conditions has certain magnetic properties, which can realize rapid separation after adsorption. However, the product prepared by this method has weak binding strength between the surface iron oxide and the activated carbon carrier, which may cause a large amount of iron oxide to fall off during the washing process, and the adsorption effect on pollutants is poor;