Assessment Chemical and Physical Properties of Disposable Water in Dairy Plants

Abstract

Disposables in dairy plants are easy to biological decomposition, in dairy plants there are Carbohydrates, Casein, and Lactose all these constituents are easy decompose in surrounded temperature that cause fast spoilage of  dairy plant disposables producing bad odors especially liquid disposables for dairy plants that also causing loosing of  diluted  oxygen by received water sources for those disposables , if drained directly to municipality drains, it decreases water treating level. So the dairy plants disposable causes noise and ecological pollution if drained to water sources without any treating. In this study all ways of assessment used with disposable waters in 3 dairy plants in Misrata city (Misrata plant, Al-Naseem plant, and Al-Rawy plant). The results show that, the TDS were 7,500, 8,000, and 9,000 mg/l in 3 dairy plants respectively, BOD were 3.5, 4.5, and 5.5 mg/l respectively, the COD were 1,250, 1,300, and 1,600 mg/l respectively, pH were 7, 8, and 7.9 respectively, Nitrates were 1.4, 1.9, and 1.4 mg/l respectively, Sulphates 160, 140, and 121 mg/l respectively. The liquid industrial disposables and solids are produced from milk fluid, cheese, butter and raw materials that added to milk products may be out of their standards, also liquid disposables of clean water that contains Sodium hydroxide (NaOH), Nitric acid (HNO₃), diluted sugar, protein, fat materials, added substances and metallic salts, for that suspended materials, nitrogen and phosphor are famous in liquid disposables in dairy plants, so I recommend that all dairy plants in Libya must include liquids and solids disposable treating units and apply all recommendations issued from ecological organizations to protect surrounded ecology of that plants.