A method and application of non-roasting preparation of phosphorus-containing wastewater adsorbent from aluminum-containing waste slag

Abstract

The invention belongs to the field of environmental functional material and new technology development of water treatment, and in particular relates to a method and application for preparing a phosphorus-containing wastewater adsorbent without roasting aluminum-containing waste residue. The present invention adopts aluminum sludge of water supply plant and aluminum plant waste residue as preparation raw materials, and prepares phosphorus-containing wastewater adsorbent through three steps of preparing aluminum-containing water, granulating and curing; the process of the invention is simple and avoids sludge stacking and landfilling The land occupation and environmental pollution caused by the process are realized, and the reuse of waste is realized at the same time, and the reduction of aluminum slag is realized. The adjuvant cement-based grouting material to be added in the granulation process has low cost, can increase the strength of the adsorbent, and does not require roasting, thus avoiding the high energy consumption of the roasting process or chemical reaction in the prior art. The adsorbent prepared by the invention is suitable for treating wastewater with different concentrations of phosphorus, and can be reused while efficiently reducing the phosphorus concentration.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials and water treatment new technology development, and in particular relates to a method and application for producing phosphorus-containing wastewater adsorbent without roasting aluminum-containing waste slag. Background technique [0002] The production of phosphate fertilizer, livestock breeding, phosphate rock mining and sludge dehydration in sewage treatment plants will produce a large amount of phosphorus-containing wastewater, of which the phosphate concentration of phosphorus-containing wastewater produced by sludge dehydration is as high as 53mg / L. Exceeding the standard of phosphorus in water will lead to eutrophication of the water body, resulting in a large number of algae in the water, a decrease in dissolved oxygen, the inability of aquatic organisms to survive, and serious consequences such as deterioration of water quality. [0003] At present, the commonly ...

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Problems solved by technology

[0007] Chinese patent application (notification number: CN102815778A), patent name: a preparation method of an environmentally friendly dephosphorization agent, the method is to acid-dissolve the aluminum slag after the wastewater treatment of the aluminum foil factory, add iron salt additives and calcium aluminate powder to polymerize reaction, and finally a liquid dephosphorization agent is obtained, which has good phosphorus removal effect and less dosage, but its preparation process requires polymerization reaction to maintain the system temperature, and the process is complicated and cannot be reused.

[0008] Chinese patent application (notification number: CN104587960A), patent name: a method for manufacturing high-temperature modified aluminum sludge for phosphorus removal, the method grinds, granulates and bakes aluminum sludge, and increases the internal pore size of the filler by adding starch , enhanced the phosphorus removal effect of aluminum sludge, and the aluminum sludge modified by high temperature has obvious effect on the removal of phosphate, but there are disadvantages such as complex process, energy consumption and the obtained filler can not be reused.

[0009] Chinese patent application (notification number: CN101070202A), patent title: a kind of method of utilizing aluminum hydroxide sludge to produce aluminum-iron composite water purifying agent, this method mainly adopts iron-containing waste acid and aluminum hydroxide sludge to stir and react to produce, take The supernatant after the reaction is the aluminum-iron liquid composite water purifier, which turns waste into treasure, the preparation method is simple, no secondary pollution but cannot be reused

[0010] Chinese patent application (notification number: CN104986837A), patent name: a preparation method of polyaluminum sludge molding phosphorus removal material, the method is to add polyaluminum sludge from a water supply treatment plant to an aqueous slurry containing zeolite powder and bauxite powder In the coagulant of raw materials and various components, the obtained powdery polyaluminum sludge is granulated and molded and roasted at high temperature to obtain the phosphorus removal filler. This method is simple in process, easy to separate after use, and can be recycled. complex and energy consuming

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