Biological Purification of Chemically Pre-Treated Dairy Wastewater Before Discharge into a Municipal Sewage Systems

Gulyás, Gábor and Fazekas, Bence and Varga, Regina and Kárpáti, Árpád (2015) Biological Purification of Chemically Pre-Treated Dairy Wastewater Before Discharge into a Municipal Sewage Systems. HUNGARIAN JOURNAL OF INDUSTRY AND CHEMISTRY, 43 (1). pp. 45-48. ISSN 0133-0276


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Dairy production is one of the most inefficient processes with respect to water usage in the food industry. It was estimated that the production of a litre of milk creates three to four litres of wastewater. Dairy wastewater contains a high amount of dissolved and suspended solids. Moreover, it contains high concentrations of fat, protein, and carbohydrate. Consequently, the dairy wastewater content of organic compounds is high and so is its chemical oxygen demand. The majority of organic compounds are biodegradable with a high biological and chemical oxygen demand ratio. In this work, we examined the biological purification of physico- chemically pretreated wastewater from a Hungarian milk-processing factory before it was discharged into the public sewage system. The chemical oxygen demand of the pre-treated wastewater ranged from 500 to 2500 mg dm-3. We found that it was possible to achieve efficient organic material removal from nutrient-poor wastewater without nutrient dosage contrary to the literature. The activated sludge system manifested efficient organic material removal that required a smaller biological volume. Experiments with biofilms have shown that a thicker biofilm needs more dissolved oxygen, which dictates oxygen input levels to be sufficient for creating an aerobic environment.

Item Type: Article
Uncontrolled Keywords: nutrient-poor wastewater; Chemical oxygen demand; Dairy wastewater; Biofilm; Activated sludge
Subjects: Q Science / természettudomány > QD Chemistry / kémia
Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia
T Technology / alkalmazott, műszaki tudományok > TD Environmental technology. Sanitary engineering / környezetvédelem, hulladékkezelés, egészségügyi mérnöki technika (ivóvízellátási és szennyvízkezelési technika)
Depositing User: MTMT SWORD
Date Deposited: 23 Jul 2015 06:32
Last Modified: 23 Jul 2015 06:32

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