Method for co-processing anaerobic digested sludge in cement kiln

Abstract

The invention provides a method for co-treating anaerobic digested sludge via a cement kiln. The method comprises the following steps: carrying out anaerobic treatment on sludge to obtain digested sludge, feeding from a raw material grinding mill, grinding and drying the sludge in the raw material grinding mill, collecting the sludge by a bag type dust collector, homogenizing the sludge in a raw material homogenization silo as a cement raw material, conveying the cement raw material into a rotary kiln via a pre-decomposition system, and burning the cement raw material to prepare cement; the raw material grinding mill is further connected with a conditioning tower, and the other end of the conditioning tower is connected with the pre-decomposition system. The method provided by the invention is used for achieving the resource utilization of the sludge and drying the sludge in the raw material grinding mill through hot air at the kiln tail so as to save equipment and energy, and the drying moisture can be applied to the conditioning tower to save water. The method provided by the invention needs no residue or tail gas treatment and is an environmentally friendly method.

Description

technical field [0001] The invention relates to the field of waste reuse, in particular to a method for co-processing anaerobically digested sludge in a cement kiln. Background technique [0002] Municipal sewage sludge has the characteristics of high water content, large volume, easy corruption, and odor. At the same time, it also contains a large amount of organic matter, rich nitrogen, phosphorus and other nutrients, heavy metal compounds, toxic compounds, pesticides, and a large number of pathogens. Parasite eggs, etc., if not properly reduced, stabilized or recycled, will easily cause large-scale secondary pollution. After the municipal sewage sludge is treated with anaerobic digestion, the organic matter in the sludge is digested and decomposed, which can stabilize the sludge and make it less prone to corruption. In addition, through anaerobic digestion, most pathogenic bacteria or roundworm eggs are killed or decomposed as organic matter, making the sludge harmless. ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of anaerobic digestion sludge treatment in the prior art, the present invention provides a method for co-processing anaerobic digestion sludge in a cement kiln, which solves the problem of digestion sludge treatment in anaerobic digestion technology and makes digestion The reduction of sludge to zero not only saves landfill costs and land resources, but also enables resources to be recycled and turned waste into treasure

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