Method of treating percolate obtained from wastewater of biogas stations and plants

摘要

A method for treating percolate from waste water from biogas plants after separating the solid particles according to the invention consists in adjusting the pH of the obtained percolate to 1.5 to 5.5, adding a flocculant, separating the sludge after coagulation and concentrating the aqueous phase the concentrate obtained is suitable for droplet irrigation, the distillate has a process water quality. The apparatus consists of a first percolate pit (1) located downstream of the separator (2) which is connected to the reactor (3), the reactor outlet (3) being connected to the first filter press (4) via a sludge sink (4A), the reactor (3) being provided with a stirrer (5) and an inlet connected to the first acid reservoir (6) for pH adjustment and with a second flocculant reservoir (7), the filtrate outlet of the first filter press (4) is connected to a second filtrate reservoir (8) which is connected to the evaporator (9), the evaporator (9) is connected to the third distillate sump (10) and to the fourth concentrate sump (11), the fourth concentrate sump (11) is connected to the third sodium hydroxide reservoir (12) to adjust the concentrate, and is interconnected with the second filter press (13), whose drain for the aqueous phase is connected to the fifth hopper (14) for the fertilizer concentrate, the sludge from the first filter press (4) and the second filter press (13) is disposed of after draining.