The Study of Adaptive Reuse of Sludge from Wastewater Treatment Plant in Industrial Parks

• Main Authors: Meei-Yuh Yan, 顏美玉
• Other Authors: 盧重興
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/63342979466917860211

碩士 === 國立中興大學 === 環境工程學系所 === 96 === Since 1960, the Industrial Development Bureau Ministry of Economics Affairs has successively developed and completed 60 industrial parks throughout the country, offering the industry the production bases, and has set up 39 set types of wastewater treatment plants to deal with the wastewater in these industrial parks. But the large quantity of produced sludge from these treatment plants has already caused potential environmental problems. With the increasing expenses of sludge removal and treatment, how to properly deal with sludge has become an urgent issue. At present, the general sludge is treated by landfill, accounting for 31.6%, heat treatment or re-utilizing for 31.6%, and temporarily storing in the plants for 36.8%. The harmful sludge is buried after treatment by solidification. The sludge contains high concentration organic composition, and the high concentration organic composition possessed a large quantity of biomass whose ways of re-utilizing are direct change, biological change, biomass methane and so on. The sludge of the industrial wastewater also contains the inorganic composition, including carbon, iron, aluminum, phosphorus, potassium, heavy metal and silicate, etc., which can be regarded as logistics and material. The ways of re-utilizing are fritting, charring, recycling and melting, etc.. From the analysis, 21 treatment plants in the industrial parks have the problem of heavy metal that exceeds the soil pollution monitoring level on the general land, so it can’t be directly utilized in the soil. This study suggests the reuse of sludge in the industrial wastewater treatment plants; that is, substitute raw materials with cement and have brick-making and fritting products, which are the most appropriate direction for future sewage treatment. The second suggestion is the recycling of heavy metal, which can deal with 93.05% of the mud in the industrial areas, in order to achieve the purpose that the mud can be utilized again. Finally, the sludge of the industrial parks can be reused as biomass, such as compost and producing hydrogen, but it needs to cooperate with the categorized mechanism of mud and to control the content of heavy metal, in order to improve the utilization rate of biomass.