Apparatus for relieving surface-layer clogging of denitrification deep-bed filter and method for running the same

An apparatus for relieving surface-layer clogging of a denitrification deep-bed filter, mainly comprising a settling tank (2), an adjusting tank (3), a denitrification deep-bed filter (4), a clean water tank (5), a first chemical storage tank (14), and a second chemical storage tank (15);

• the settling tank (2), the adjusting tank (3) and the denitrification deep-bed filter (4) are connected through tubes therebetween, the first chemical storage tank (14) and the second chemical storage tank (15) are respectively communicated into the adjusting tank (3) through tubes, a first control valve (16) is arranged on the tube between the first chemical storage tank (14) and the adjusting tank (3), a second control valve (17) is arranged on the tube between the second chemical storage tank (15) and the adjusting tank (3), the denitrification deep-bed filter (4) is provided with a gas collecting device (12), an uniform water distributor (9), a first filling material layer (6), a second filling material layer (7), and an electrodialysis membrane (8) sequentially from up to down, a certain distance is arranged between the first filling material layer (6) and the second filling material layer (7) and between the second filling material layer (7) and the electrodialysis membrane (8), the bottom end of the denitrification deep-bed filter (4) is connected with the clean water tank (5) through a treated-water discharging pipe (18), the backwash pump (20) is arranged between the clean water tank (5) and the bottom end of the denitrification deep-bed filter (4) through a backwash pipe (19);
• a mixed solution of sodium acetate and methanol with a molar ratio thereof of 3:2 is filled in the first chemical storage tank (14);
• and a rhamnolipid solution with a mass concentration of 30-40% is filled in the second chemical storage tank (15).