Bio Block filter media manufacturers, suppliers and factory in China

In biofilters, a thin microbial film forms on the surface of Trickling Filter Media. Wastewater is treated when it passes through a biofilm. The principle of biofilm degradation of organic matter is as follows (see left picture)..

As the wastewater flows down through the Trickling Filter Media, oxygen from the air is absorbed by the water and enters the biofilm. Dissolved organic matter in wastewater diffuses into the biofilm. This biofilm consists of microorganisms that degrade ammonia nitrogen in wastewater into carbon dioxide and water, while new microorganisms continue to grow. This process consumes oxygen. Therefore, in thick biofilms, anaerobic (anaerobic) conditions exist in the part of the membrane closest to the Trickling Filter Media. When the biofilm becomes too thick, it sloughs off the filter media surface into flakes. Biofilm flakes settle in a subsequent settling tank. New types of biofilms are developing rapidly. Therefore, it is a very simple and easy process, depending only on the form of Trickling Filter Media, the supply of wastewater and the temperature of the wastewater.

Trickling Filter Media acts as a catalyst in connection with fermentation and similar processes, in the sense that Trickling Filter Media will create an optimal hydraulic liquid flow through the bioreactor by pumping biomass through vertical pipes. This creates an optimal large interactive contact surface for the bacteria, and the bacteria also get the best growth conditions on the rough surface of the Trickling Filter Media. This means that it will be possible to significantly increase the number of working bacteria. Trickling Filter Media is patented.

The filter walls must hold the filter material, protect it from cold winds, and improve natural ventilation so that the wastewater can be aerated. At the same time, the walls must be provided with a sufficient number of holes (at least 8%) for air to pass through in order to aerate the wastewater.

It is necessary to supply oxygen to the biological oxygenation processes. Normally, this happens by a chimney effect in the filter, however, in certain cases, a mechani­cal aeration can be necessary. High organic load, small differences in temperature between air and wastewater, and protection of the filter against frost and the environment against filter flies are all factors that can necessitate forced aeration of the filter. By natural aeration, i.e. by chimney effect, the airflow can move both upwards and downwards. In the winter, the air in the filter, which has the same temperature as the wastewater, is lighter than the surrounding air, therefore, the airflow moves upwards. In the summer, at the night the airflow moves upwards and in the day it moves downwards. By a difference of temperature of 6o C, an air speed of approx. 0.3 m/min. occurs. This speed supplies sufficient oxygen for the oxygenation of organic matter, even in highly loaded filters.