Aerobic composting and Vermicomosting of paper-mill sludge

• Main Authors: Chih-wei Hsu, 許智偉
• Other Authors: Dyi-Hwa Tseng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/00978447035394886355

碩士 === 國立中央大學 === 環境工程研究所碩士在職專班 === 98 === The treatment of wastewater from papermaking processes generally produces large quantities of paper-mill sludge. If the sludge do not properly treat and dispose, it will cause the problems of environmental sanitation and soil pollution. Therefore, this study evaluates the feasibility of making composts from paper-mill sludge and other organic waste materials by aerobic composting and vermicomposting. The experiments were firstly put the mixture of paper-mill sludge (PMS) with cattle manure (CM) and the mixture of PMS with pig manure(PM) and rice husk (RK) into two 1m3 of in-vessel composting tanks, respectively. Then, the mixture was composted under thermophilic stage reaction of Aerobic composting to stabilize the material until the temperature went down to below 40℃. Finally, the pretreated composts were taken out the vessel and following a 30-day vermicomposting process with Eisenia foetida. The suitability of pretreated composts as materials for vermicomposting was based on the appearance and properties analysis after aerobic composting process. In addition, the suitability also based on the observation of earthworm growth condition after 30-day of vermicomposting process. If a whole earthworm’s life cycle included cocoons, young worms, non-clitellated worms and clitellated worms were found in the composts, thus the materials were suitable for the growth of Eisenia foetida. Experimental results indicated that the optimum earthworm seeding density was 4.5 kg/m2 and feed loading rate was 1.33 kg-feed/kg-worm/day for vermicomposting of the mixture of PMS with CM. In addition, the optimum air-flow rate for vermicomposting of the mixture of PMS with PM and RK was 0.04 L-air/min/L-compost at the conditions of 4.5 kg/m2 earthworm seeding density and 1.51 kg-feed/kg-worm/day feed loading rate. The mature composts, converting from paper-mill sludge after aerobic composting and vermicomposting in this study, had good quality with moist appearance and adhesive texture. The contents of various nutrition elements and heavy metals in composts are also met the specification for plant growth