Pretreatment of Botanical Waste from Constructed Wetland by Sulfuric Acid for Enhancement of Composting Efficiency

• Main Authors: Yu-Sheng Jhang, 張煜昇
• Other Authors: Chien-Jung Lin
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/11067664704209053830

碩士 === 嘉南藥理大學 === 環境工程與科學系 === 103 === Botanical waste from constructed wetland (BWFCW) increases with the number of wetlands set up in Taiwan. Some Researches tried to evaluate the feasibility of recovery BWFCW by composting but failed and reported it resulted from the non-biodegradable composition, cellulose and lignin content in BWFCW. Therefore, in this research BWFCW-reed from constructed wetland in Chia Nan University of Pharmacy & Science was gathered and impregnated with sulfuric acid as a pretreatment process for the hydrolysis of cellulose and lignin content in BWFCW. The feasibility of pretreatment of BWFCW by sulfuric acid for the enhancement of composting efficiency was discussed. It was found that the cellulose and lignin content decreased after the pretreatment by soaking reed in different sulfuric acid concentrations with various reaction times. Furthermore, the hydrolysis of hemi-cellulose increased the specific surface area and promoted the procession of composition. In addition, the quality analysis of finished compost products is as following. The pH ranged between 7.5~8.3 and the C/N ratios were between 14~18.5. The moisture contents were in the range of 58.4% and 76%. The organic matter were analyzed to between 84~89.8%. The contents of N, P, K were 0.6~0.9%, 0.06~0.11%, and 0.35~0.88%, respectively. It was found that apart from a slightly higher moisture content and phosphorus content inadequacies, the rest characteristics of the BWFCW pretreated by sulfuric acid are in compliance with R.O.C. miscellaneous composting standard. This study confirms pretreatment of reed, one of BWFCW by impregnation with sulfuric acid could promote composting efficiency and feasibility.