化學沈降處理生技業鎂鹽廢水之研究

The Study on the Chemical Precipitation in handling the Magnesium Salt in the Wastewater of the Biotech Industry

李承豐(Cheng-feng Li)

指導教授 ： 廖述良

國立中央大學/工學院/環境工程研究所碩士在職專班/碩士(2012年)

摘要

生技產業發展是國家重點發展項目，但因為生技製程和一般製造業不同及原物料使用的特殊性及多元性，因製程反應中的程序包含有機合成反應、萃取、分離、下料等作業中所產生之廢水含有有機溶劑，流程中也會添加無機物的物料，例如金屬鎂等原料，導致廢水處理系統的負荷及無機鎂鹽沈積問題。所以，為了降低無機鹽類的沈積，應周全的檢討並瞭解各種實廠操作時會遭遇到進流水質變化的影響，包括鹽類溶解、析出的狀況及其它影響因子，要針對無機鎂鹽的去除達成經濟性有效性的最佳化的條件，取得原水後透過實驗的驗證及實場操作的驗證，依總合評估的結果找出化學沈降最佳的操作點，以利往後做為高濃度無機鹽類的去除機制之建立，能使現場的操作人員更有效的控制無機鹽類的析出並加以沈降去除，提升廢水處理廠操作功效，降低廢水處理廠失控的風險，此研究廢水中鎂鹽去除，使用化學沈降法來做為處理方法，藉由添加實廠中原有高pH值廢水來作為調整pH值的鹼劑，並以沈降、懸浮固體物、上澄液鎂離子殘留濃度的實驗，可得出最佳操作pH值為pH值11，可以達到有效去除原廢水中鎂離子的濃度大於99%以上，在實廠的操作時pH值變化最大的範圍為pH值10.5～pH值13，所以要將鎂鹽廢水調整至pH值11時，因控制不易常會使得原廢水和鹼劑混合後的pH值超過12以上，造成實務操作上的負擔，而在實驗中次佳的操作值為pH值10，實廠的操作中容易調整至pH值10，且同樣可以達到有效去除原廢水中鎂離子的濃度大於95%以上，所以pH值10在實廠操作中為最佳的操作pH值。

關鍵字

生技製程 ； 無機鎂鹽 ； 化學沈降

並列摘要

Biotechnology development is always among one of the Country’s key developing industries. However, due to its different production process compared to general manufacturing industry, as well as its uniqueness and pluralism of its raw material usage, the biotech manufacturing process contains organic synthesis reactions、extractions, exfoliations、 and blanking …etc., and those make the waste water during the manufacturing process contains organic solvent, and raw material such as inorganic saline is also to be added during the manufacturing process, Consequently, it causes the burden of waste water treatment and inorganic saline deposit. Therefore, in order to reduce inorganic saline deposit, we should fully comprehend and check various factors affecting the water inflow quality during factory operation, including saline solvent, exfoliations and other factors.To aimed to the removal of inorganic saline in order to reach economic scale and maximize effectiveness, we shall try to prove through real experiment after obtaining raw water, to find out the most ideal level of reducing chemical sedimentation, to set up a system for the removal of high density of inorganic saline deposit in the future, and to further help the on-site operation workers control the precipitation of inorganic saline and remove the deposit more effectively. Hence we may upgrade the waste water treatment efficiency and lower the control risk in waste water treatment facilities.In this research, we’re focused on the removal of magnesium salt in the water by utilizing the chemical sedimentation. And by adding the on-site waste water that already contains high pH value as an alkalinity media to adjust the pH value, we may obtain the best pH value of 11 through the experiment of sedimentation, suspended solids, and the residual concentration of magnesium ion in the supernatant. This process works effectively by reducing the magnesium ion when the density is more than 99%. During the on-site operation, the changing range of pH value is between 10.5 and 13, therefore, we need to adjust the pH value in the magnesium salt waste water to 11 in order to get the best result. Since it’s easy to get the pH value over 12 if operating improperly and causes the operation burden, therefore, we prefer to use the second best level while pH value reaches 10, It’s easy for factories to control and adjust the pH value down to 10, as well as removing over 95% of the magnesium ion density in the existing waste water.

並列關鍵字

Inorganic Magnesium Salt ； Chemistry Sedimentation/Precipitation ； Biotechnology Manufacturing Process

參考文獻

Lertchai Charerntanyarak (1999) “Heavy Metals Removal by Chemical Coagulation and Precipitation” , Wat. Sci. Tech., Vol. 39, NO. 10~11, P. 135-138, Thailand

Semerjian, L,G.M. Ayoub(2001) “High-pH–Magnesium Coagulation–Flocculation in Wastewater Treatment”, Advances in Environmental Research 7, P.389–403, Beirut, Lebanon

蘇登福，2010年，「化學沉澱法處理光電業含氟廢水之探討」，國立中央大學環境工程研究所碩士論文，中壢市。

鄭志鴻，2011年，「立弘生技廢水處理場生物處理系統功能評估報告」，中興工程顧問股份有限公司，台北市。

參考文獻