| 摘要: | 摘要
下水道建設是現代化都市不可或缺的主要公共設施，國家競爭力之評
量指標，行政院積極推動全國污水下水道建設，於103 年9 月10 日核定內
政部營建署所提「污水下水道第五期建設計畫」，計畫於104~109 年將公共
污水下水道「用戶接管普及率」提升至35.10%及「整體污水處理率」提升
為60.80%之目標，預料下水污泥量亦將逐年增加。
下水污泥中富含有機物質、無機物質及重金屬等特性，本研究蒐集彙
整國內外下水污泥再利用法規、再利用技術，配合我國下水污泥特性、相
應之法規、政府政策及國情等因素，將下水污泥再利用技術依「再生能源
利用」、「綠農地利用」及「土建材料利用」三大類下水污泥再利用技術，
納入技術之優勢及劣勢因子，進行技術面、市場面、環境面及法規面等面
向進行討論，評估最適化前處理污泥減量技術之優勢與劣勢並討論其可行
性。
考量下水污泥再利用方式眾多，且礙於現行法規及行政院農委會反對
下水污泥相關再利用產品施用於農地等限制因素，本研究提出之下水污泥
碳化設備併入水泥窯製程方案以符合法規及農委會之意見。
本研究主要是利用水泥窯之廢熱將下水污泥碳化，同時將下水污泥乾
燥、碳化製程產生之有機廢氣導回水泥窯內燃燒，再將碳化產品(輔助燃料)
與煤炭混合後做為水泥製程燃料使用，最終目地係將下水污泥灰渣混入煤
灰中直接進入到卜作嵐材料應用體系。;Abstract
Sewage systems are an indispensable public facility of modern urban areas,
and are an indicator of national competitiveness. As part of its active efforts in
developing nationwide sewerage systems, the Executive Yuan ratified the
“Phase 5 Sewage System Construction Plan” of the Construction and Planning
Agency, which aims to increase the ratio of household pipelines connected to
public sewage to 35.10% and the overall ratio of sewage treatment to 60.80%
between 2015 and 2020; sewage sludge volume is expected to show sequential
growth each year.
Sewage sludge is rich with organic matter, inorganic matter, and heavy metals.
This study collects data on domestic and foreign laws and regulations related to
sewage sludge reuse, reuse technologies, characteristics of sewage sludge in
Taiwan, corresponding laws and regulations, government policy, and the
national situation. Sewage sludge reuse technology is divided into three
categories, namely “renewable energy,” “green farmland” and “construction
material,” and the strengths and weaknesses of each technology is analyzed from
the perspective of technology, market, environment, and laws and regulations,
evaluating the most technology for sludge reduction and discussing its
feasibility.
Considering that there are many methods for reusing sewage sludge, but sewage
sludge reuse products cannot be used in farmland due to current laws and
regulations, as well as objections from the Council of Agriculture (COA), this
study proposes the use of sewage sludge carbonization equipment together with
a cement kiln, so as to produce a product that conforms to current laws and
regulations and satisfies the COA’s requirements.
This study mainly uses waste heat from a cement kiln to carbonize sewage
sludge. The organic waste gas generated from drying and carbonizing the
sewage sludge is channeled back into the cement kiln for combustion, and then
the carbonized product (auxiliary fuel) is mixed with coal and used as fuel for
the cement making process. The ultimate objective is to mix sewage sludge ash
into coal ash and directly uses it as part of the pozzolanic material application
system. |
