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There are a number of constraints which must be met when considering the dimensions and location of the entrance tank.bmp These items are discussed below.
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The inlet channel was modified to have only one opening leading to the sedimentation tank instead of two. See the explanation for this under Sedimentation Tank. The concrete in the inlet channel will be rounded going into the pipe so that the transition of flow is smoother. The amount of rounding is yet to be determinedthe construction sequence for this transition will be done as follows:
before pouring the concrete for the base slab of the inlet cchannel, a 90 deg elbow will be coupled to the 6" pipe (substituting the chimeneys). The idea is thet the concrete follows the shape of the elbow in the bottom slab of the channel to reduce the expansion los created by the change in direction of the flow. Please refer to graphical explanation of the process.
Sedimentation Tank
The sedimentation tank design is significantly different from previous designs. The main problem that brought about the change is that too much sludge was settling out in the inlet manifolds at Cuatro Comunidades. There was originally a similar design for Agalteca, so it needed to be fixed. To see a list of ideas on how to fix this problem until the final design was chosen, click here. To see other potential changes that can be made if needed to correct this problem, click here.
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The main innovation on the sludge drain is its cover. Initially the cover served also as a support for the slope, bu but now, as the slopes are built by a solid piece of concrete, this is not necesary any more.
One of the advantages of the new design is that it is much easier to clean, as the only removable parts will be the 6 in inch PVC inlet manifold and the drain cover which was designed in sections to make it easy to remove. Also, the fact that the floc have flocs will settle inside the sedimentation tank, which has a sludge drain specifically designed to purge all the sludge, will imply that after emptying the tanks we woill have the remaining sludge in the bottom of the sedimentation tank will be very little to none.
The idea of designing the sludge to clean from the bottom of the tankdrain cover with small orifices is to create an even vacum along the entire length of the sedimentation tank to reduce dead spaces where sludge could be accumulated.