Frequently Asked Questions

Q. How can you minimize the headloss through a Grit King Separator?

A. Hydro International's design program will calculate the headloss. We recommend that the inlet velocity is between 3 to 5 ft/sec at peak design flow and it may be necessary to adjust the inlet pipe diameter to maintain this. The system headloss will vary accordingly and it will be in proportion to the square of the inlet velocity.

Q. Will the Grit King operate on either a gravity system or a pumped system?

A. Yes. The Grit King dynamic separator operates on both gravity and pumped systems.

Q. Can the Grit King Process be used for other applications other than wastewater treatment plant?

A. Yes. We would request that the Client provides a grading curve and specifications for the material to be separated and this would provide the information for our Research and Development department to size the unit.

Q. What materials are used for the construction?

A. Stainless Steel 304 is used although other materials, such as 316 could be specified.

Q. What is the effect of flows higher or lower than peak design flow on the performance of the separator?

A. The unit will accept higher or lower hydraulic flows than the Peak Design Flow however if the flow is higher than the design flow then the headloss will increase and the performance reduce. If flows are very low then organics will settle out with the grit.

Q. When do you recommend using a Grit-Cleanse classifier and not a conventional classifier?

A. If the ratio of Peak Design Flow to Dry Weather Flow (DWF) is greater than 4 to 1 we recommend the use of a Grit-Cleanse™ Classifier and not the Grit Classifier. This is to enable the grit entrained sewage to be put through a secondary separation stage prior to the classifier Archimedean screw thus reducing fecal organics discharged in the grit.

Q. Do you require access to the top of the Grit King Separator?

A. There are no moving parts at the top of the separator and therefore access is not normally required for routine maintenance. However, access platforms are typically included as good design practice.

Q. Is the system able to operate on unscreened sewage?

A. We recommend that the Grit King Process is operated after screens as in our experience the influent at a sewage works can contain very large objects. Also if we are operating with a pumped system rag balling can create a problem. In special circumstances and depending on the specific circumstances we would consider installing upstream of screens but this would not be our preferred option.