Domestic Wastewater Treatment

     WASTEWATER is the water having been polluted by organic substances and chemicals that make complex bonds so they are harmful to life and the environment. Broadly speaking, wastewater is categorized into two types: 1) Domestic wastewater, namely the waste water from the activities of living things in fulfilling life processes such as cooking, washing and so forth; 2) Industrial wastewater, namely the wastewater produced by business activities producing goods to meet human secondary needs involving the use of large quantities of chemicals.

     As a ‘smokeless industry,’ hotels and restaurants must manage wastewater, so that it is expected to prevent pollution and damages to the environment. This is in accordance with the Law No. 32/2009 concerning Environmental Protection and Management (PPLH) and Government Regulation No. 27/2012 concerning Environmental Permits to Business Players.

     At present, the government is very strict on the activities producing pollution, so that every business or activity is required to have an Environmental Impact Analysis (EIA) or the Environmental Management Efforts and Environmental Monitoring Efforts (UKL-UPL) and environmental permit. Without environmental permits, the other permits cannot be issued so the business activities can be suspended.

     One of the simple wastewater treatment units has begun to be applied in Bali as carried out by CV Amerta Nugraha Dewata based on Jalan Ngurah Rai No.45, Kediri, Tabanan, Bali. This company does wastewater treatment with Extended Aeration.

     The wastewater treatment with an extended aeration system is carried out with the aerobic aeration or decomposition or oxidation process. All the wastewater is included in the aeration vessel. At the beginning of the aeration, there is mixing of wastewater with active sludge and most of the oxygen in the aeration vessel is a biochemical oxidation process. The biochemical oxidation process occurs as a process of decomposition of organic materials by decomposing bacteria. This process runs in an aerobic condition and lasts very fast due to the continuous addition of oxygen into the wastewater.

     “By processing aerobic wastewater, it is ascertained there is no odor even though the processing is open and results in zero sludge or no mud is left which needs to be disposed of. The processed water is very clear and does not smell,” said I Nyoman Budayasa, the operations manager of the company, while adding that guarantee for the processed products is valid for life, where the water is odorless without having to add bacteria or chemicals and without leaving sludge.

     So far, landless villas or hotels use septic tanks and infiltration. Micro aeration sludge processes uses septic tanks as aeration tanks to obtain accelerated aerobic processes. The first process is aeration and the second process is sedimentation and the return of the activated sludge. Finally, the processed water is contained in the third tank. v BTNewspaper/p