The effectiveness of anaerob-aerob bio filters and phytoremediation using Pistia Stratiotes for reducing COD and BOD5 content in laundry liquid waste

Abstract

Abstract

The laundryliquid waste is rich in COD and BOD₅ and thus need to be processed before being flown to environment. A study aims to reduce the COD and BOD₅ in that waste has been conducted in January – March 2018. The waste (135 L) was treated using a batch system that was consisted of 2 aerob and 2 anaerob tanks and a Pistia Stratiotesphytoremediation pond. The liquid waste was kept for 10 days in anaerob tanks, 7 days in aerob tanks and 15 days in phytoremediation pond. By the end of the experiment, the COD reduced from 1.440 mg/l to 110 mg/l (the effectiveness was of 92.36%). While the BOD₅ reduced from 510 mg/l – 55 mg/l (the effectiveness was 89.21%). Other water quality parameters such as pH was normal and DO was improved. The treated waste was used for rearing Oreochromis niloticus (3-4 cm TL) and was kept for 15 days. The survival rate of the fish was 100%. Based on data obtained, it can be concluded that the combination of bio filters and phytoremediation system using Pistia Stratiotesis effective to reduce the COD and BOD₅ content in the laundry liquid waste. 

 Keyword : waste water, detergent contaminated waste, batch system, waste management