BIOTAL technology is based on the concept, suggesting sewage treatment and disposal of cleaning products to the condition of consumer products – industrial water and organic fertilizer. (Recommendation of the use of treated wastewater from the BIOTAL plant by the Institute of Hygiene of O.M.MARZEEV of Academy of Medical Sciences № 21/4191 dated 11/05/2002) Removed from the system stabilized and dewatered surplus activated sludge after disinfection can be used as organic mineral fertilizer (SNIP 2.04.03-85, paragraph 6.341). For disinfection aerobically stabilized surplus sludge is applied biothermal processing (composting) in accordance with the requirements of SNIP 2.04.03-85 paragraph 6.402-6.403. Composting should be done in combination with fillers (solid waste, peat, sawdust, leaves, straw, etc.) or finished compost. With appropriate facilities and equipment, decontamination of surplus sludge can be done by heating it to 60 °C with maintaining at least 20 minutes, at the design temperature (SNIP 2.04.03-85, paragraph 6.402). Treated wastewater can be used for irrigation, industrial use, such as car washing to return to the secondary circulation (toilets, fire ponds, etc.).
Use of purified wastewater for irrigation:
1 – BIOTAL plant;
2 – pump for purified wastewater evacuating from a tertiary clarifier;
3 – drip irrigation;
4 – locking device;
5 – filtering trench;
6 – filtering well;
7 – ventiduct d=50 mm.
The most simple and profitable way to utilize treated waste water is to use it to irrigate crops. Irrigation with treated wastewater is a complex measure aimed at protecting the environment from sewage pollution, intensifying agricultural production and storing the aesthetic appearance of landscape areas. Irrigation with treated wastewater uses irrigation methods: surface and micro-irrigation. Application of micro-irrigation provides water saving for watering in 2 times with micro-irrigation and in 4-6 times – with drip irrigation. Technical characteristics of micro-irrigation systems: water flow per hectare – 4-15 m3/h at a pressure of 0.05-0.1 MPa; power consumption per 1 ha-0,3-1,2 kW/h; water management options – manual, automated and automatic, using humidity sensors – ground tensiometry.