Grit Chambers

Grit Chambers Industries with sand or hard, inert particles in their wastewaters have found aerated grit chambers useful for the rapid separation of these inert particles. Aerated grit chambers are relatively small, with total volume based on 3-min retention at maximum flow. Diffused air is normally used to create the mixing pattern shown in Fig. 25-44, with the heavy, inert particles removed by centrifugal action and friction against the tank walls. The air flow rate is adjusted for the specific particles to be removed. Floatable solids are removed in the aerated grit chamber. It is important to provide for... 

Material removed by the bar-screen and in the grit chamber can cause odours if not disposed off quickly after removal. However, screenings and grit are not a major source of odours at municipal plants. 

Discussion of paper, Grit chamber model tests for Detroit, Mich, sewage treatment project (Gee. E. Hubbeli). Trans. A.S.C.E., 104 232-240. 

Grit. This is a mixture of coarse and dense materials such as sand, bone chips, and glass. They are collected in the grit chamber and are directly disposed of in a landfill. 

Therefore, for grit chambers controlled by a proportional-flow weir, the width of the tank must be constant, which means that the cross-section should be rectangular. 

For grit chambers controlled by other critical-flow devices, such as a Parshall flume (fhe proportional flow weir is also a critical-flow device), fhe flow fhrough fhe device is also given by 2 =. Thus, the following equation may also... 

Three physical treatment devices employed in wastewater treatment control include screens, grit chambers, and gravity sedimentation. Briefly describe each of these devices. 

Figure 5 presents the evolution of some UV spectra of raw sewage sampled hourly during 24 h at the entrance of a wastewater treatment plant (after the grit chamber) [4],... 

After screening, some sort of sedimentation is generally practiced. Grit chambers are long, narrow tanks designed so that the flow is about one foot per second allowing the heavier suspended matter to settle. 

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