Biological phosphorus removal incorporates phosphorus into biomass for bacterial or algal growth. A study in India tried using several different systems for phosphorus recovery from wastewater for energy consumption, cost, and nutrient recovery. Estimates of the variation in levels of N and P in different types of Indian wastewaters are also compiled from several references, with levels ranging from 20-85 mg/L total nitrogen and 4-15 mg/L total phosphorus in municipal wastewater to 1000-1200 mg/L total nitrogen and 500-1500 mg/L total phosphorus in distillery spent wash or piggery wastewater. Another newer bioprocess involves using an algal-bacterial symbiosis system. So far algal-bacterial symbiotic systems (ABSS) have mainly been used in treatment of swine, domestic and industrial wastewaters. ABSS is a process using algae and bacteria cooperatively for oxygen production in photosynthesis by algae to drive bacterial processes of ammonia oxidation, nitrite oxidation and phosphorus bioaccumulation, while byproducts of bacteria feed the algae (CO2, polyphosphate, and nitrate) using cooperative nutrient exchange between organisms. While ABSS have mainly been used for treating swine, domestic, and industrial wastewater, they may also be useful for treating aquaculture tail water. The removal/recovery of nutrients and pollutants from aquaculture wastewaters (tail waters) is related to environmental and other factors affecting efficiency of the system including light, pH, dissolved oxygen (DO), and carbon sources (to support the bacteria), salinity, algae, bacteria and other microbe species, proportions of algae and bacteria, types of bioreactors (suspended biomass or immobilized in biofilm or by cell entrapment), and the processes used.