Graded backwashing mixed filler autotrophic denitrification biological filter

• Main Authors: LIU ZHENG, GUO YANFEN, LI XINKAI
• Format: Patent
• Language: Chinese; English
• Published: 25.04.2023
• Subjects: CHEMISTRY; CLEANING; CLEANING IN GENERAL; METALLURGY; PERFORMING OPERATIONS; PREVENTION OF FOULING IN GENERAL; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The utility model discloses a graded backwashing mixed filler autotrophic denitrification biological filter which comprises a filter body, and a floating water layer, a mixed filler layer, a biological filler layer, a supporting layer, a filter brick layer and a clear water layer are sequentially arranged in the filter body from top to bottom; the floating layer at the top of the tank body is connected with a water inlet system; the clear water layer at the bottom of the tank body is connected with a clear water discharge pipe; the tank body is connected with a graded backwashing system, and the graded backwashing system comprises a first-stage water inlet pipeline, a second-stage water inlet pipeline, a first-stage blow-off pipeline, a second-stage blow-off pipeline and a gas washing pipeline which are sequentially arranged on the tank body from bottom to top; the filter tank is an improved autotrophic biological filter tank capable of removing nitrate nitrogen in sewage, mainly adopts elemental sulfur, lime