Effects of Seasonal Temperatures and Water Volume on Swine Wastewater Treatment

• Main Authors: Chang-En Lee, 李長恩
• Other Authors: Liang-Chou Hsia
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/48101829414949113176

碩士 === 國立屏東科技大學 === 動物科學與畜產系所 === 101 === Currently, hog industry has transformed from family business to a large-scaled industry. The amount of effluent water is already way over a farm’s ability to dispose wastewater. Furthermore, the environment pollution, green house effects and green awareness make public aware of controlling water pollution generated by hog industry. All these explain the importance of having 3-step wastewater disposal pipeline techniques. Currently, because of the variation in the wastewater inflow amount, the huge volume of wastewater and seasonal change, the wastewater treatment facilities in most hog companies cannot fully function. Furthermore, when hog solid disposals are soaped in water, they are dissolved into water. This phenomenon increases the waste level and reduces the level of the organic components and the efficiency of resource recycling. Additionally, all related research about the benefit of using 3-step waste water disposal pipeline techniques have been conducted in 1980s and cannot reflect the current hog industry status. Therefore, this work would like to analyze the statistical data collected from 2007 to 2012 to understand the impacts of environmental factors on the wastewater disposal pipeline in a hog industry and to seek a good solution for waste water disposal. This work is conducted in the Nan-Jin branch of Taiwan Sugar Corporation in Jia-Yi and the experiments separate into cool seasons, warm seasons and hot seasons. This work has conducted three experiments: The first experiment explores the relationship of the water usage and retention period with different seasons. We found that a cool season uses average 10,077.96 tons, a warm season uses average 11,036.44 tons and a hot season uses average 12,314.07 tons of water. The water retention period in a cool season is average 25.19 days, The water retention period in a warm season is average 22.88 days and the water retention period in a hot season is average 20.39 days. The water usage in a hot season is larger than a cool season with P &;lt; 0.001 and the water retention period in a hot season is shorter than a cool season with P &;lt; 0.001. The water usage trend is hot season＞ warm season > cool season. The water retention period is cool season＞ warm season＞ hot season. The second experiment explores the relationship between seasonal water usage and the quality of effluent water. When checking the wastewater quality at the entrance, the seasonal change is an important factor on the water temperature and pH ( water temperature with P &;lt; 0.001; pH with P &;lt; 0.05). BOD of effluent water in a cool season is 70.44 mg/L, BOD in a warm season is 52.86 mg/L and BOD in a hot season is 37.99 mg/L. COD of effluent water in a cool season is 441.74 mg/L, COD in a warm season is 349.47 mg/L and COD in a hot season is 268 mg/L. Based on COD and BOD, the water quality is better in a hot season than in a cool season with P &;lt; 0.001. The processing efficiency of effluent water BOD and COD is hot season＞warm season＞cool season. The third experiment explores the relationship between the consumed forage volume and the amount of dropping. Consumed forage volume in a cool season is average 173.44 tons, consumed forage volume in a warm season is average 166.64 tons and consumed forage volume in a cool season is average 153.62 tons. The amount of dropping in a cool season is average 34.89 tons, the amount of dropping in a warm season is average 33.83 tons, the amount of dropping in hot season is average 31.87 tons. The consumed forage volume is larger in a cool season than in a hot season with P &;lt; 0.001. The consumed forage volume and the amount of dropping is cool season＞warm season＞hot season. Generally the quality of wastewater is affected by the number of the hogs, the feeding method, the source of syringing water and other factors. It is too complex to understand the relationship of these factors on the quality of wastewater. Even the same handling site has different quality of wastewater when the season is different. Therefore, it is not easy to identify the effect of a single factor. According to the previous discussion, the seasonal temperature, water retention period and water consumption have large impact on the effluent water. This work shows that the seasonal temperature has significant effects on the water volume, retention period, waste water quality, the consumed forage and the amount of dropping. According to the current government regulations, the effluent water quality can fulfill the requirement in a hot and warm season. However, in a cool season because the temperature decreases, the decomposing abilities of germ decrease to reduce the wastewater handling abilities. As a result, the water quality are the worst in the three experimental seasons. The recommendation is to reduce the amount of wastewater volume to increase the processing time of germ to improve the water quality.