Treatment of high‐fat‐containing dairy wastewater in a sequential UASBR system: influence of recycle

Abstract

BACKGROUND: Raw cheese whey originating from white cheese production results in a strong and complex wastewater excessively rich in organic matter (chemical oxygen demand, COD=28-65 g L −1 ), fatty matter (14-24.5 g L −1 ) and acidity (3.9-6.1 g L −1 ). It was treated in a three-stage configuration consisting of a pre-acidification (PA) tank and sequential upflow anaerobic sludge bed reactors (UASBRs) at 2.8-7 g COD L −1 day −1 organic loading rates, during which the effects of effluent recycling at low rates and promoted SRB activity were investigated. Acidification, volatile fatty acids (VFA), COD and fatty matter removal and volatile solids were monitored throughout the system during the study.

A review on fermentative hydrogen production from dairy industry wastewater

“…Dairy processing is a high volume water‐consuming industry with water use throughout all process steps including cleaning, sanitization, heating, cooling and floor washing; while wastewater volumes generally range between 2‐ and 3‐fold the volume of processed milk . Dairy plants generate wastewater flows with characteristics that are heavily dependent on the raw materials used, the processing technology and the recovery rate of effluent wastewater . Dairy wastewater is characterized by strong color, offensive odor, high organic content in terms of COD and BOD 5 , high solids (3300–57045 mg L −1 ) and high fat, oil and grease (FOG) content (14.000–24500 mg L −1 ), with smaller amounts of nitrogen (30–46 mg L −1 ) and phosphorus (30–650 mg L −1 ) .…”

“…Dairy plants generate wastewater flows with characteristics that are heavily dependent on the raw materials used, the processing technology and the recovery rate of effluent wastewater . Dairy wastewater is characterized by strong color, offensive odor, high organic content in terms of COD and BOD 5 , high solids (3300–57045 mg L −1 ) and high fat, oil and grease (FOG) content (14.000–24500 mg L −1 ), with smaller amounts of nitrogen (30–46 mg L −1 ) and phosphorus (30–650 mg L −1 ) . The organic content of dairy wastewaters is typically in the range of 1 to 10 g COD L −1 and 0.3 to 5.9 g BOD 5 L −1 while seasonal variations are correlated with the volume of milk received for processing .…”

The Behavior of Organic Phosphorus Under Non-Point Source Wastewater in the Presence of Phototrophic Periphyton

“…A three-stage configuration of a pre-acidification tank and sequential upflow anaerobic sludge bed reactors (UASBRs) at OLRs of 2.8-7 g COD L −1 d −1 has been used to treat raw cheese whey with an effluent recycling achieved COD removal of 50%-92% and fat removal of 63%-89% [60]. An upflow anaerobic packed bed (UAPB) reactor filled with seashell treated cheese whey at OLRs of 1.6 to 9.9 g COD L −1 d −1 , and HRTs of 6-24 h at 25 °C removed 95% of COD [61].…”

Sustainable Agro-Food Industrial Wastewater Treatment Using High Rate Anaerobic Process

“…has been used to treat raw cheese whey with an effluent recycling achieved COD removal of 50%-92% and fat removal of 63%-89% [60]. An upflow anaerobic packed bed (UAPB) reactor filled with seashell treated cheese whey at OLRs of 1.6 to 9.9 g COD L…”