Sewage sludge harmlessness disposing technique

Abstract

The present invention discloses a harmless treatment process for sewage sludge. The dewater treatment is applied to the sewage sludge and then the treated sewage sludge is delivered into a dryer so as to be dried; when the water content of the dried sewage sludge is controlled to range from 40 percent to 50 percent, 40 percent to 60 percent of anhydrated sewage sludge is taken to be mixed with the bituminous coal and then treated sewage sludge is delivered into a hot blast stove to go into incineration. The mix proportion between the bituminous coal against the sewage sludge ranges from 0.25 to 1 and the heat generated from the incineration is supplied to the dryer in the form of hot air. The tail gas delivered out from the dryer enters a cyclone separator to go into the solid separation and the fine particles after the separation are recycled, and the discharged gas enters a water bath tower and is exhausted after going through the cooling and deodorization treatment. The sewage sludge is mixed with the coal and then the incineration is implemented and the heat generated from the incineration is recycled so as to be supplied to the dryer for the present invention, thus avoiding the moisture content of the sewage sludge from being lowered to be less than 10 percent, simplifying the combination of the equipments, saving the initial investment and lowering the operating cost and enhancing the throughput.

Description

technical field [0001] The invention discloses a sludge harmless disposal process, in particular to the harmless disposal process of sludge produced in printing and dyeing sewage treatment. Background technique [0002] Printing and dyeing sludge is the sediment produced in the sewage treatment process of the sewage treatment plant. It contains a large amount of water, organic matter, bacteria, and various metal elements, mainly iron, silicon, calcium, sulfur, aluminum, phosphorus, magnesium, etc. Currently Sludge disposal methods mainly include composting, sanitary landfill, agricultural greening, ocean dumping, incineration and other technologies. Printing and dyeing wastewater and the sludge generated contain a large amount of organic matter, which can be as high as 10-15%. The contents of nitrogen, phosphorus, and potassium are only 1%, 0.2%, and 0, and the heavy metal ion content in the sludge exceeds the heavy metal content in the agricultural sludge. pollution proble...

AI Technical Summary

Problems solved by technology

[0002] Printing and dyeing sludge is the sediment produced in the sewage treatment process of the sewage treatment plant. It contains a large amount of water, organic matter, bacteria, and various metal elements, mainly iron, silicon, calcium, sulfur, aluminum, phosphorus, magnesium, etc. Currently Sludge disposal methods mainly include composting, sanitary landfill, agricultural greening, ocean dumping, incineration and other technologies. Printing and dyeing wastewater and the sludge generated contain a large amount of organic matter, which can be as high as 10-15%. The contents of nitrogen, phosphorus, and potassium are only 1%, 0.2%, and 0, and the heavy metal ion content in the sludge exceeds the heavy metal content in the agricultural sludge. secondary pollution problem

Images