由於國內垃圾目前多採用焚化方式處理,因此焚化後所產生的大量底渣、飛灰就成為後續需處理的問題。底渣再利用產品主要利用在土木建設、道路集配等,但由於底渣中含有高量的水溶性氯離子會使得再利用受到限制,因此底渣之前處理更顯重要,而本研究重點主要為利用加入酸性藥劑以四段連續式水洗方式來去除底渣中之水溶性氯離子以符合國內法規規定之第一類型再利用標準(依CNS1240規定再利用底渣中之水溶性氯離子需低於0.024%),進而將研究成果充分的運用到實際工程之上。 本研究以液固比、滯留時間、及添加酸性藥劑的濃度作為實驗的三大影響條件,結果發現前述三大條件的提高會與水溶性氯離子削減效率成正相關。根據實驗結果發現,單槽滯留時間10分鐘、液固比=3、酸性藥劑添加濃度相當於水洗液(醋酸/水=0.01,以重量計算)pH值=2.3時,水溶性氯離子含量由0.903%(原底渣)降至0.060%(T=4),去除效率為93.36%;但當條件提高為單槽滯留時間30分鐘、液固比=3、酸性藥劑添加濃度相當於水洗液(醋酸/水=0.01,以重量計算)pH值=2.3時,水溶性氯離子含量由0.890%(原底渣)降至0.020%(T=4),去除效率則高達97.75%,另將研究成果應用於實際工程規劃,概估以添加酸液之水洗方法處理底渣的成本約342元/噸。
Because of domestic incineration of concern, fly ash has become a follow-up question to be addressed. Bottom ash recycling products are mainly used in civil construction, road additires, it contains a high amount of water-soluble chloride ion will make the reuse restrictions before the incineration bottom ash uses again pretreatment for the bottom ash also appears important, and how does this research mainly increase the acidic medicament by four section of continuous-type washing in elimination bottom ash water-soluble chloride ion to meet domestic laws and regulations stipulations (The bottom ash the water-soluble chloride ion to be lower than 0.024wt% according to the CNS1240 before bottom ash reusing) as well as reduces the cost to favor in the project effectively the utilization. This research by liquid solid ratio、time、and the increase acidic medicament's quantity takes experiment's three tremendous influence condition, finally discovered that the fore-mentioned three conditions the enhancement can increases the efficiency with the bottom ash the water-soluble chloride ion in elimination, namely time = 10 minutes、liquid solid ratio =3, and the increase the acidic medicament are the acid: water , the bottom ash the water-soluble chloride ion density by 0.903% drop to 0.060% (to reduce the efficiency =93.36%); But when the condition enhances for time = 30 minutes、liquid solid ratio =3, the increase the acidic medicament is the acid: water =1: 100, the bottom ash the water-soluble chloride ion density drop to 0.020%, reduces the efficiency to reach as high as 97.75% and according to this study initially estimate cost of this work is 324 dollars each ton