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Positive displacement pumps are inefficient in speed when compared to centrifugal devices, but have the ability to discharge highly vicious liquids - https://goo.gl/xtfcNy

Find best and light-weight, cordless, battery operated pipette controller, micro pipette controller and pipette pump. Handles both glass and plastic pipettes from 1ml to 100ml in easy manner.

Conventional sewage treatment plant involves three stages, called primary, secondary and tertiary treatment. First,with conventional sewage treatment plant the solids are separated from the wastewater stream. Then dissolved biological matter is progressively converted into a solid mass by using indigenous, water-borne micro-organisms. Finally, the biological solids are neutralized then disposed of or re-used, and the treated water may be disinfected chemically or physically (for example by lagoons and microfiltration). The final effluent can be discharged into a stream, river, bay, lagoon or wetland, or it can be used for the irrigation of a golf course, green way or park. If it is sufficiently clean, it can also be used for groundwater recharge or agricultural purposes Pre-treatment Pre-treatment conventional sewage treatment plant removes the materials that can be easily collected from the raw wastewater and disposed of. The typical materials that are removed during pre treatment include fats, oils, and greases (also referred to as FOG), sand, gravels and rocks (also referred to as grit), larger settleable solids and floating materials (such as rags and flushed feminine hygiene products). Pre treatment also typically includes a sand or grit channel or chamber where the velocity of the incoming wastewater is carefully controlled to allow sand grit and stones to settle, while keeping the majority of the suspended organic material in the water column. Sand, grit, and stones need to be removed early in the process to avoid damage to pumps and other equipment in the remaining treatment stages.