Vertical-Flow Constructed Wetlands in Cooperating with Oxidation Ponds for High Concentrated COD and BOD Pig-Slaughterhouse Wastewater Treatment System at Suphanburi-Provincial Municipality

Abstract

Oxidation Pond (OP) as engineering tool is generally used for treating the pig slaughterhouse wastewater which normally contains high concentration of COD and BOD in effluent. Unfortunately, it cannot reduce the organic substance (blood, hairs, grease, meats, solid dunks and some contaminants) from pig slaughtering areas under the 2-consecutive oxidation ponds by producing the minimum values of COD 151.92 mg/L, BOD 79.14 mg/L, coliform bacteria 2.6 x 10 -5 MPN/100mL, and fecal bacteria 1.5 x 10 -5 MPN/100mL but all of them above the standard values. After treating the effluent by VFCW-Typha from the 2-consecutive oxidation ponds, the results found COD 90.92 mg/L, BOD 31.67 mg/L, coliform bacteria 1.5 x 10 -4 MPN/100mL and fecal bacteria 2.0 x 10 -3 MPN/100 mL which were almost above the standard values. It is noted that the modification of 2-m consecutive ponds to 4-m consecutive ponds in cooperating the prolongation of VFCW-Typha length instead of 30 meters to 40-50 meters, width 3-5 meters, and still keeping 1-m depth would be enough to support the pig-slaughterhouse wastewater treatment system.Summarily speaking, the experimental results have been brought to say that the Oxidation Pond as the engineering tool could not be applicable in slaughterhouse wastewater treatment that containing high concentration COD and BOD from slaughtering and dissecting activities.

Wetlands for Wastewater Treatment

“…One study showed that SSFCW followed by anaerobic stabilization ponds system had significant removal of BOD, COD, and TSS; and it was more efficient in TSS and nutrient removal than classic systems (Gholizadeh et al, 2015). An oxidation pond-CW integrated system showed effective reduction of COD, BOD and bacteria from Pigslaughterhouse wastewater (Pitaktunsakul et al, 2015). A CW with an attached microbial growth Bio-hedge system enhanced the stability and performance in organic matter and nutrients removal with 33-67% lower HRT compared to conventional CW (Valipour et al, 2015).…”