Visión general: The filter material of the denitrification deep bed sand filter adopts 2~4mm quartzsand medium, the filter bed depth is 1.5m-1.8m, the filter bed has enough water qualityprotection depth to avoid water quality breakdown, even if there is sludge expansion orabnormal conditions in the front treatment process, it will not cause hydraulic breakdown of thefilter bed. lt can easily cope with the peak flow rate or the treatment plant sludge swelling andother abnormal conditions. Due to the high solid load and the depth of the bed, the homogeneousquartz sand filter bed allows solid impurities to penetrate the surface of the filter bed andpenetrate into the filter material to reach the depth of the entire filter tank to trap solids. When the denitrification filter completely loses the filter head, the filter must be backwashed, backwashing simulates the human hand washing and scrubbing mode,using strong air and water forcombined backwashing,The high-strenath air causes the filter bed to sliahtly expand, so that the filter materials rub each other, causing all the intercepted SS is stripped of the media, and the SS is cleared out of the filter through backwashing water. The cleaning rate reaches 100%. The backwash mode is adopted, and the backwash water does not exceed 2% of the water volumeof the treatment plant.

Process characteristicsy

①High reaction efficiency and strong nitrogen removal ability.
②Strong adaptability to the change of water quality and quantity;
③Stable operation, good effluent water quality; High load, smallland occupation;
④Discharge mud on the waist part, further reducing more than 30% of the backwash water volume;
⑤The dual deep bed denitrification filtration system effectivelydivides biochemical and filtration tasks,lmproving the filter operation time, reducing the frequency ofnitrogen removal, and reducing the operating costs.