Conventional Approach for Abattoir Wastewater Treatment

Abstract

Detailed physico-chemical studies on abattoir effluent using lime, alum, ferrous sulphate and an anionic polyelectrolyte were tried individually and in combination. Among the coagulants tried, lime resulted in good settling of the sludge. At 400 mg l(-1) of lime dose, the Suspended Solids (SS), Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) removals were found to be 41.9%, 38.9% and 36.1%, respectively. Best results were obtained with lime and ferrous sulphate in a combination ratio of 400:100 mg l(-1), and the COD reduction of 36.1% at 400 mg l(-1) of lime, further improved to 56.8%. Lime and alum dose of 400:50 mg l(-1) resulted in an increased COD reduction of 42.6% compared to 36.1% at lime dose of 400 mg l(-1). However, the same lime dose with ferrous sulphate addition of 100 mg l(-1) resulted in an increased COD reduction of 56.8% compared to 36.1%. This is a more efficient option for abattoir wastewater treatment and also cost effective. Ferrous sulphate with anionic polyelectrolyte resulted in good removals. Though it is a costly chemical, the dose needed is just half that of lime and just 0.1 mg l(-1) of anionic polyelectrolyte resulted in good reductions in SS, BOD and COD of 54.2%, 49.6% and 43.8% respectively. Studies indicated that the lime and ferrous sulphate in the combination of 400:100 mg l(-1), and ferrous sulphate and polyelectrolyte in the combination of 100:0.1 mg l(-1) are the two feasible options. Lime in combination with alum can also be applied but resultant sludge volume would be more.

Heterotrophic nitrification by Achromobacter xylosoxidans S18 isolated from a small-scale slaughterhouse wastewater

“…Abattoir wastewater contains high-strength organic nitrogen (N), total nitrogen (TN) being in the range of 150-400 mg/l [4]. In intermittently aerated treatment processes, nitrate (NO 3 --N) is produced by means of nitrification during the aeration periods [4][5][6]. However, limited investigations have been carried out on the isolation of nitrifying bacteria from slaughter house wastewater, few examples being, Pseudomonas sp.…”

“…In few cases, the waste is chemically coagulated and flocculated before discharge into the sewers [2]. Wastewater from a typical abattoir in India possesses chemical oxygen demand (COD) concentration in the range of 4,400-18,000 mg/l [3]. Blood, one of the major dissolved pollutants in slaughterhouse wastewater, has a COD of 375,000 mg/l.…”

A Critical Review on Processes and Energy Profile of the Australian Meat Processing Industry

“…Aluminium sulphate (alum) has been used for water purification since ancient times. However, some studies showed that using alum for abattoir wastewater treatment produces higher amount of sludge in comparison to ferrous sulphate and an anionic polyelectrolyte [23]. The addition of coagulant aids such as silica and activated carbon can help reducing sludge volume [24].…”

Polyurethane Trickling Filter in Combination with Anaerobic Hybrid Reactor for Treatment of Tomato Industry Wastewater

“…This wastewater is predominantly loaded with organic wastes and is rich in organic content (Bozinis et al, 1996). Biological treatment processes are widely used for the treatment of agro-industry wastewaters, such as tomato industry wastewater which contain high concentrations of biodegradable organic matter (BOM) (Satyanarayan et al, 2005;. Anaerobic treatment of high strength wastewater is widely accepted in the industry Mehrdad et al, 2007;Del Pozo et al, 2003;Bernet &Paul, 2006).…”