Wastewater Treatment Plant is a very delicate unit of operation that often requires a certain level of expertise to operate it. Sometimes it can be quite difficult to control especially in situations whereby there is an unexpected and sudden buildup of heavy load of contaminants coming from collection source.
Generally, in order for the treatment plant to operate and perform up to expectations meeting tight quality requirements, there are a few items which can be added to the system. Below you will find a list of critical wastewater equipment and treatment facilities that will overall improve and contribute towards better handling and they will come in handy in certain situations.
Multimedia Filter Beds System
Compared to a single media filter, a stacked multimedia bed system that consists of two or more different layers of fine to coarse filter materials is considered more effective. Usually the materials that are selected for the each individual bed is made up of different grain sizes and specific gravities so that they have a different settling rate. Typically in order for the filter bed system to be able to function properly to polish the final wastewater discharge, 3 main materials are usually selected and they are silica sand, anthracite and garnet (in the order of increasing specific gravity).
Froth Control System
Wastewater generally contains surfactants which will lead to formation of heavy foams and it gets worse especially when the water is aerated using diffusers. The foaming condition usually leads to buildup of thick froth covering the aeration pond surface which can decrease the level of dissolved oxygen, thus affecting the whole aeration pond. Froth other than complicating the process control, it is also hazardous when wind carries it off the surface and settles everywhere especially when it collects on walking platforms.
Thus, it is important to control and minimize the froth level using a special built-in control system. Usually the mechanism can be made up of overhead spray nozzles that derives the water from the pond and sprayed it out to break the froth. These days, a better approach is by using anti-foaming chemical additive system which can minimize the level of froth generation in the tank.
Further necessary equipments.
- solid bowl centrifuge
- rotating biological contactors