2.1. 1. Cost effective 2. High efficiencies 3. Various pollutants can be removed due to various species microorganisms living in the media 4. little amount of sludges generated
3. designed to remove organic compounds such as nutrients( phosphorus) from wastewater
3.1. WHAT is phosphorus(P)? -essential nutrient for plant and algae growth EFFECT of P on receiving water - uncontrolled growth of algae lead to taste and odor problems in drinking water - may cause harm to aquatic life as it lowered the level dissolved oxygen.
4. Phosphorus removal REQUIREMENTS
4.1. 1 Sufficient amount of C and P in secondary influent. 2. The anaerobic section is sized correctly. 3. Sufficient cations( Mg and K) to facilitate P release and uptake.
5. Anaerobic zone REQUIREMENTS
5.1. 1 Total P to BOD5 ratio of 1:20 2. Hydraulic Detention Time(HDT) is about 1 hour. 3. Solid Retention Time( SRT)
6. 1 industrial activity 2. Residential areas 3. Water treatment 4. Food soils
6.1. SOURCES OF P IN WASTEWATER
7. 1. Sensitive to parameters such as temperature, pH, heavy metals and other toxic components inr influent wastewater 2. Lot of space needed for installment
7.1. DISADVANTAGES
8. phosphorus removal PROCESS
8.1. STEPS: 1. Anaerobic phase: P is released. 2. The influent enters anaerobic phase first and polyphosphates contains in bacteria cells is converted into phosphate and released to the wastewater. 3. the denitrification occurs as the wastewater enters the anoxic phase. 4. the wastewater from the end of aerobic stage is recycled to the beginning of anoxic system(provide oxygen) in the form of nitrate to denitrifying bacteria. 5. In the aerobic stage, nitrogen gas that formed in anoxic stage is released to atmosphere, carbonaceous material is oxidized, oxidation of ammonia to nitrate and P uptake occurs.
