A few months ago, we discussed the importance of managing the biomat so systems are able to accept the amount of effluent delivered and provide treatment before release into the environment. As a part of the discussion, we indicated one way to effectively manage biomat formation in systems with gravity distribution was to use drop boxes and sequential distribution. We have had a few comments and questions about this so, we thought we should revisit gravity distribution methods and look at some of the advantages and disadvantages.
There are three types of gravity distribution between trenches: parallel, sequential and serial. Parallel
