Method for preparing zeolite water-supply sludge ceramsite for pretreating micro-polluted water

Abstract

The invention provides a method for preparing zeolite water-supply sludge ceramsite for pretreating micro-polluted water, and belongs to the technical field of micro-polluted water pretreatment. The ceramsite is prepared from water supply factory dehydrated sludge, modified zeolite powder and a pore-forming agent according to a certain proportion by the following method which comprises the following steps of: drying, smashing and sieving the water supply factory dehydrated sludge to obtain dry sludge; smashing, sieving and calcining natural zeolite powder, and moidifying the natural zeolite powder by sodium chloride to obtain the modified zeolite powder; uniformly mixing 50 to 60 percent of the dry sludge, 35 to 49 percent of the modified zeolite powder and 1 to 5 percent of the pore-forming agent, and granulating the mixture on a granulating machine to form balls, and thus obtaining raw materials of which the particle sizes are 2 to 7 millimeters; drying and roasting the raw materials to obtain sintered ceramsite; and naturally cooling the sintered ceramsite to room temperature, and screening to obtain the ceramsite finished product. The surface of the ceramsite prepared by usingthe method is rough; the ceramsite has multiple apertures; and the ceramsite is used for pretreating the micro-polluted aquatic growths to forcibly remove ammonia, nitrogen and organic matters.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of slightly polluted water, and in particular relates to a preparation method of zeolite feedwater sludge ceramsite used for the pretreatment of slightly polluted water. Background technique [0002] In recent years, with the rapid development of industry, the acceleration of urbanization, and the increase in the types and quantities of agricultural chemicals, most urban drinking water sources in my country have been polluted to varying degrees, and most of them have been transformed into slightly polluted water sources. Pollutants such as ammonia nitrogen exceed the standards for surface water environmental quality class III water bodies. The traditional water treatment process coagulation-sedimentation-filtration-disinfection not only has a limited effect on the removal of organic matter and ammonia nitrogen in slightly polluted water sources, but also produces harmful chlorinated disinfecti...

AI Technical Summary

Problems solved by technology

[0006] In view of the above technical problems in the existing technology, in order to combine the strong adsorption performance of zeolite on ammonia nitrogen and polar organic matter with biological oxidation, strengthen the removal effect of ammonia nitrogen and organic matter in slightly polluted water source water and solve the problem of sludge resource utilization in water supply plants Problem, the present invention provides a zeolite-based water supply sludge ceramsite for micro-polluted aquatic biological pretreatment, which is made of dewatered sludge from a water supply plant, modified zeolite powder, etc.