Erina Rahmadyanti, Elizabeth Titiek Winanti, Dewie Tri Wijayati Wardoyo, Diah Wulandari
The affectivity of constructed wetland as an alternative of environmental friendly technology has been studied in many researches. Although its efficacy mostly depends on waste types processed. This research aimed to determine the efficacy of horizontal sub surface flow constructed wetland to process wastewater of coffee processing in small industry contained high organic content (pectin, protein, and sugar), nutrient, soluble material and low pH. The research was experimental research using horizontal subsurface flow constructed on pilot scale, built of glass box (0.5 m high x 0.5 m wide x 1.5 m long), sealed by high density polyethylene (HDPE), positioned on the soil with slope 0.01 mm-1. The substrate used was 10-20 mm gravel, with depth of 0.35 m and 0.15 m free-edge. The plant used was Typha latifollia. HSSFCW was operated on three hydraulic loading rate (HLR) of 3, 6, 12 cm.d-1 and employed for 1 day, 2 days, 7 days, and 10 days. HSSFCW performance was seen by comparing effluent and influent for its COD, BOD, TSS, TN and TP parameters. HSSFCW using Typha latifollia for processing wastewater in industry is effectively proved. The result of pollutant removal process indicated that higher removal efficiency showed at low HLR of 3 cm/d and high HRT of 10 days. In this research, HSSFCW using Typha latifollia was able to reduce BOD, COD and TSS more than 85%. The removal efficiency of COD was 97.12% on HLR 3 cm/d, 86.81% on HLR 6 cm/d, and 85.49% on HLR 12 cm/d. In BOD, removal efficiency was 97.46% on HLR 3 cm/d, 92.48% on HLR 6 cm/d and 86.81% on HLR 12 cm/d. While removal efficiency of TSS was 98.37% on HLR 3 cm/d, 96.69% on HLR 6 cm/d, and 95.11% on HLR of 12 cm/d. Therefore, for specific nutrient removal efficiency of TN and TP was less than 50%. Those were around 46.17% on HLR 3 cm/d, 35.82% on HLR 6 cm/d, and 31.68% on HLR 12 cm/d for TN and 18.67% in HLR 3 cm d, 12.65% on HLR 6 cm/d, and 6.63% on HLR 12 cm/d for TP. Thus, prior treatment is required to optimize the removal efficiency of TN and TP as well as longer HRT observation rather than in BOD, COD, and TSS. Implementing HSSFCW technology is highly possible for small industry of coffee processing due to its high efficiency, low operational and maintenance cost as well as no expert required for the operation. © EM International.
Departement of Civil Engineering, Faculty of Engineering, Universitas Negeri Surabaya, East Java, Indonesia; Departement of Management, Faculty of Economic, Universitas Negeri Surabaya, East Java, Indonesia; Departement of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Surabaya, East Java, Indonesia
