| 摘要: | 人工濕地植栽移除物的產量隨濕地增加而成長，部分學者進行人工濕地植栽移除物堆肥化可行性之研究，然而堆肥成效不彰，可能原因為植栽移除物本身木質纖維素含量高而不利於微生物分解所致。因此，本研究以不同氫氧化鈉濃度及浸漬時間進行植栽移除物中主要產物蘆葦之前處理，評估氫氧化鈉前處理對促進人工濕地植栽移除物堆肥化之可行性。研究發現，氫氧化鈉浸漬前處理後，蘆葦之木質纖維素含量由纖維素48.58%及木質素16.25%分別降低至h組(5N、96hr)之纖維素38.79%及g組(5N、24hr)之木質素10.75%；另外，未經氫氧化鈉浸漬前處理之蘆葦堆肥成品中纖維素及木質素分別為50.39%及27.52%，而經氫氧化鈉浸漬前處理後蘆葦堆肥成品之纖維素最低可降低至h組(5N、96hr)纖維素之28.42%；木質素含量最低可降至g組(5N、24hr)之9.02%，顯示蘆葦進行氫氧化鈉前處理確實可降低難分解成分含量，有助於堆肥化之進行。此外，堆肥成品分特性如下：pH介於7.51~8.3；碳氮比介於15.5~25.6；水分含量介於58.4~80.6%；有機質介於77.31~89.12%；氮、磷、鉀含量分別為0.4~0.7%、0.02~0.10%、0.43~0.88%，發現水分與碳氮比含量略高，磷及氮含量稍嫌不足外，其餘皆符合農委會雜項堆肥規範。考量堆肥所需時間、產品水分含量、pH值、有機質、重金屬含量、C/N下降速度以及堆肥成品是否符合我國相關堆肥法令等，建議e組(5N、1hr)之操作條件可作為未來提升人工濕地植栽移除物堆肥化速率之優化操作條件。
Botanical waste from constructed wetland (BWFCW) increases with the growth of wetlands in Taiwan. Some Researches tried to evaluate the feasibility of recovery BWFCW by composting but failed and reported it resulted from the non-biodegradable semi-cellulose, cellulose and lignin content in BWFCW. Therefore, it was impregnated with sodium hydroxide as a pretreatment process for the hydrolysis of semi-cellulose, cellulose and lignin in BWFCW. The feasibility of BWFCW pretreated by sodium hydroxide for the enhancement of composting efficiency was evaluated in the present work.The cellulose and lignin content decreased after the pretreatment by soaking reed in different sodium hydroxide concentrations with various reaction times. The content of cellulose and lignocellulose in reed were decreased from 48.58% and 16.25% to 38.79% and 10.75%, respectively. Furthermore, the cellulose and lignin contents in finished compost from reed were 50.39% and 27.52%, decreasing to be cellulose 28.42% and lignin 9.02% after the pretreatment by soaking reed in sodium hydroxide solution. The quality analysis of finished compost products showed the pH ranged between 7.51~8.3 and the C/N ratios were between 15.5~25.6. The moisture contents were in the range of 58.4% and 80.6%. The contents of N, P, K were 0.4~0.7%, 0.02~0.10%, and 0.43~0.88%, respectively. It was found that the moisture content and the C/N were slightly higher. The phosphorus content was kind of inadequate. The rest characteristics of the BWFCW composting products from reed pretreated by sodium hydroxide are in compliance with R.O.C. miscellaneous composting standard. Considering the time required for composting, product moisture content, pH, organic matter, heavy metal content, C/N ratio of decline in finished compost and compost compliance with R.O.C. relevant laws and regulations, the pretreatment of reed, It was concluded one reed pretreated by soaking in sodium hydroxide solution could promote composting efficiency. |
