Using Co-Fermentation to Enhance the Hydrogen Production of Pulp Sludge

• Main Authors: Shih-Chiang Chen, 陳世強
• Other Authors: Jiunn-Jyi Lay
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/49939410008891614804

碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程所 === 99 === The wastewater generated from the papermaking manufacturing could produce a pile of sludge after the wastewater disposal handled. This papermaking leftover would be highly possible to cause pollution to the environment and the land. This has been a noticeable issue faced by all around the world; Taiwan especially gets worst of the problem due to the limited space with a great population. Traditional handling to the sludge is through dehydration, drying, and incineration, but the operation still comes to handle final disposal. In order to meet the goal of non-harmfulness and physical stability control to the sludge, it is very difficult to minimize the amount of sludge generated and the cost of handling process increased. However, using co-fermentation to enhance the decomposition of papermaking sludge not only can reduce the amount of sludge output, but also can collect hydrogen by anaerobic bio-hydrogen treatment. This technology is not only beneficial for its economical products, but also sanitarily environmental for its recycling feature. In the past, the conventional activated sludge (CAS) process is commonly used to treat municipal wastewater., because this environment might provide nitrogen, phosphorous, sulfur, and other microelement nutrition such as sodium, potassium, calcium, magnesium, and iron etc. that are all needed nutrition to the microorganism species. This CAS method is not an efficient way to handle sewage, because the industrial sewage usually need the additive due to the lack of nitrogen, phosphorous and other microelement nutrition to grow microorganism species. This research is to discuss the process of the “Using Co-Fermentation to Enhance the Hydrogen Production of Pulp Sludge”, and to build the optimal environmental condition based on generating hydrogen. The research method is to make separated trial lots by adding different ratio of plant fungus and nutrients at the constant temperature of 41±1oC for the experiment. The wastewater generated from one of the papermaking manufacturer was used as the base for the experiment. Plant fungus derived from the mixing and growing process of anaerobic bio-hydrogen treatment fluid and paper sludge. Nutrients were collected from the same system as well. The result found that the simultaneous addition of both plant fungus and nutrients generates bigger amount of nitrogen than adding nutrients only. The trial no. 23 also found that putting the base, plant fungus, and the nutrients for 50%, 25%, and 12.5% respectively would generate 181.18 ml nitrogen as the biggest accumulative amount. The result indicated that different density of plant fungus followed by the different ratio of nutrients has significant remark to the hydrogen production amount. At the ratio of nutrients ranged from 6.25% - 18.75%, its capacity obtained positive trend for the hydrogen production amount, but hydrogen producing potential (P), hydrogen producing rate (Rm), Specific hydrogen producing potential (Ps), Specific hydrogen producing rate (Rs) all became negative dropping when the ratio exceeded 18.75%. That indicated that the excess of the nutrients would limit microelement growth and activity. After data analyzing by Polynomial regression analysis and Response Surface Method, it has been found that the mutual chemical interaction between plant fungus and nutrients has significant influence to the microelement species growth. It would be better for the growth environment under low ration of nutrient and plant fungus (N/Xo) condition. The best optimal processing condition for future study is suggested to control the ratio of nutrients/plant fungus at １ ml N/ml Xo.