How to Keep Your Screening Equipment in Tip Top Shape

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screening equipment

The headworks screening equipment is the first line of defense for any wastewater facility. Their proper operation is crucial to protect all of the sensitive treatment processes that lie within the fence line. Unfortunately, like all equipment, they do not take care of themselves. We spoke with Brian Prunty, JWC’s Field Service Manager from the Service Solutions group, about what items a plant’s operations staff should consider for the upkeep of their headworks screening equipment.

Q. What is the number one item that causes problems with screening equipment?

By far the most critical item in any in-channel screen is the primary chain. Chains will naturally stretch over time and this is the killer of many screens. If left unchecked, the chain will stretch to the point where an expensive catastrophic failure will occur. A little preventative maintenance can head off this type of failure.

Q. What should an operations or maintenance staff be looking for in chain stretch?

There are a few tell-tale visual signs of the chain stretching. One is that the rollers can get oblong as the chain extends. Also, the outside of the chain can get shiny spots indicating that the chain links are scraping on the bottom of the channel. Additionally, operators should be looking for rollers that are flattening out over time.  Some of this can be corrected by simply tensioning the chain but if there is no adjustment left in the tensioning or the chain is at the end of its useful life, then it needs to be replaced.

Q. What are some other maintenance items to be looking at?

For bar-type screens like JWC’s Chain & Rake Monster, operators will want to make sure that the scraper arm is making good contact with the rakes and removing the solids. Additionally, you should make sure that the rake teeth are in good condition and not retaining excessive debris.

For finescreens it is important to look at the brush systems and spray wash used to remove debris from the screening panels. Brushes will wear over time and spray Screening Equipmentnozzles can get plugged. It is also not uncommon for the plant water supply pressure to change and the spray nozzles may not be removing as much as they were when the screen was installed. If the solids removals elements are not working correctly then carryover of solids can be an issue.

A nice feature that JWC now has available on its Finescreen Monster is a brushless design. By combining our UHMW panels with a dual spray wash system we have been able to eliminate the need for a cleaning brush – and therefore eliminating one maintenance item.

Q.Who do you use to do a major overhaul on a screen?

There are certainly many schools of thought on this. Some plants will want to take it on themselves which I think is great if the staff has the time and the training to do so. This work is obviously not warranted by the screen manufacturer.

A few screen manufacturers have the capability to overhaul screens in various manners. Some companies will require the screen to be removed from the channel and shipped back to the factory for a rebuild which is a pretty costly endeavor.

At JWC our Service Solutions group has the skills and ability to rebuild the screens on-site. A typical rebuild from JWC would include new chain, new bearings, new chain supports, replacement brushes, new seals and other wear items. We basically bring it back to a like-new condition and provide a new 1-year manufacturer’s warranty. Our customers have found this to be a very economical solution to significantly extend the life of their headworks screens.

Headworks for Smaller Plants – Beyond the Manual Bar Screen

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Wastewater bar screen or manual bar screen replaced with Auger Monster at Headworks

Wastewater Bar Screen – Not the Only Option

Water treatment facilities in smaller towns and villages, as well as treatment works supporting institutions, prisons, resorts or remote facilities, have difficult choices to make when selecting a headworks system. All require a solids control strategy, but lower flows and smaller budgets limit the available equipment options.  The historical choice in this situation has been a wastewater bar screen or a raked manual bar screen – but there are better options.  The days of sending an operator with a rake and bucket to the headworks for the daily cleaning duties should be a thing of the past.

A number of different types of equipment can be used to meet these objectives, yet public works engineers should not make that choice lightly. There is not a one-size-fits-all solution that can be applied to every headworks situation. Matching the needs of the facility to the appropriate screen or debris reduction method is paramount for both protecting downstream equipment and ensuring screened out solids are handled efficiently and effectively. The wrong choice can result in headworks systems that do not meet the required level of protection of downstream treatment processes, or a system that is too costly for the plant’s requirements.

This article explores the options for wastewater engineers and plant operators trying to strike the right balance between technology and the available funds while optimizing the plant’s efficiency.  If provides guidance on alternatives to the traditional manual bar screen while not overdesigning a system.

Click here to Read the Full Article

What’s Unique About the Automatic Bar Screen Monster

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Self Cleaning Automatic Bar Screen Reciprocating Rake Bar Screen Monster

Not Every Self Cleaning Automatic Bar Screen is the Same

We only sell the best automatic bar screen and here’s why:

  1. Reciprocating rake bar screen – one of the most popular types of screens in the industry. Reliable even in challenging applications.
  2. Explosion Proof Submersible brake motor – allows the screen to have a much lower head room, so it can fit into cramped pump stations or headworks.
  3. Completely enclosed, all stainless steel – we know odor control is important for our customers, so our automatic Bar Screen Monster is completely enclosed and built from 304 or 316 stainless steel.
  4. Fully assembled – our reciprocating rake bar screens is also one of the easiest to install. The entire Bar Screen Monster arrives assembled, ready to be dropped into the channel, bolted down and start it running.
  5. Replaceable bar screen segments – the automatic bar screen has individual bars can be removed and replaced if needed

Lear more about the Bar Screen Monster Here

Other Coarse Screening Solutions

JWC Environmental offer several other coarse screening products for municipal wastewater plant headworks including: