A comprehensive review on utilization of wastewater from coffee processing.

The coffee processing industry is one of the major
agro-based industries contributing significantly in international
and national growth. Coffee fruits are processed by two
methods, wet and dry process. In wet processing, coffee fruits
generate enormous quantities of high strength wastewater requiring
systematic treatment prior to disposal. Different method
approach is used to treat the wastewater. Many researchers
have attempted to assess the efficiency of batch aeration as
posttreatment of coffee processingwastewater froman upflow
anaerobic hybrid reactor (UAHR)-continuous and intermittent
aeration system. However, wet coffee processing requires a
high degree of processing know-how and produces large
amounts of effluents which have the potential to damage the
environment. Characteristics of wastewater from coffee processing
has a biological oxygen demand (BOD) of up to 20,
000 mg/l and a chemical oxygen demand (COD) of up to 50,
000 mg/l as well as the acidity of pH below 4. In this review
paper, various methods are discussed to treat coffee processing
wastewaters; the constitution of wastewater is presented
and the technical solutions for wastewater treatment are
discussed.