A Study Of The Sludge Vetor Drying Technic And Application Of Municipal Sludge In Guangzhou City

This paper describes the progress and the status of sludge disposal and resource utilization in the world at first, analyses the advantages and disadvantages of various ways of sludge disposal. It composites and analyses the sludge characteristics and advocates that sludge in Guangzhou are suitable for the use of building materials.Research shows that: sludge drying high energy consumption range (percentage of moisture 35%～60%) is the plastic stage of sludge. Combines with the sludge disposal situation in Guangzhou ,through the contrast experiment between the natural drying of sludge and drying in constant temperature ,and the analysis of the sludge " aerobic turn over stack " experiment, combine with the macroscopical phenomena that sludge drying is easy to"harden in surface, wet in inside", it considers that if we can bypass the high energy consumption range(percentage of moisture 35%～60%)-the plastic stage of sludge during drying, we can save the energy consumption of sludge drying. Through the theoretic analysis and calculation of the energy consumption about the sludge drying which adopt"dry sludge mix with raw sludge"technology, educe a conclusion that it can debase the energy of sludge drying if it bypass the high energy consumption range.Sludge vector drying can break the sludge rubber group's imprisoned function to the water and obstain huge surface; enhance drying heat and mass transfer efficiency hugelg. It can bypass the high energy consumption range, enhance the drying efficiency, debase the energy and cost of sludge drying.By the end of 2010,most cities in China will be forbidden to use clay brick. So, it has significant significance to use sluge to burn sludge brick, it can both be instead of the clay brick, also it can use the resources characters of the sludge. This paper combines with the practical project, analyses the technics and equipment of sludge vector drying, make a summary about the entire technical process. It considers that sludge brick technic is mature, and it can be took as a comparative reasonable disposal method of sludge disposal in Guangzhou area.