Primary Sludge Pump Options
Primary sludge pumps are typically used in municipal Wastewater treatment facilities to transfer digested sewage and sludge. This is a broad pump category that encompasses positive displacement pumps to pump sludge in ranges usually up to about 500 GPM. The choices of pumps vary from double diaphragm pumps, plunger pumps, double disc pumps, rotary lobe pumps, progressive cavity pumps and more.
In todays pump marketplace, there are generally two schools that operators and consulting engineers follow when specifying primary sludge pumps. The first option is Continue reading
Primary Sludge Pumps
With tough sludge pumping applications like those found at municipal Wastewater Treatment Facilities, (WWTP’s) having the right primary sludge pumps can help reduce hassles and your spare parts budget down the road. This was just the case for the City of Meridian’s recent wastewater treatment facility upgrade and expansion in Meridian, Idaho.
Long Island Pump installation
Pumping wastewater in Nassau County NY poses unique challenges. First the county borders Long Island Sound to the North and the Atlantic ocean to the south which can bring variations in both weather and the types of wastewater that need to be pumped. Nassau County is home to over 1.3 million residents with a mix of suburban residents and vacation properties.
The City of Long Beach, New York was impacted by Hurricane Sandy a few years ago. The municipal wastewater treatment plant experienced flooding and equipment damage. An additional challenge is a nearby recreation center that includes a golf center. With golf balls and other debris entering the sewage system, the pumps were requested to manage unexpected solids. Wastecorp was awarded the bid to replace an existing plunger pump to upgrade the existing infrastructure. Since the facility is so close to the ocean, a grinder was also installed to manage storm surge debris that will likely occur in the future. Continue reading
Pumping wet wipes at a municipal wastewater treatment facility
Wastecorp employees read a story posted on YAHOO! from Yahoo and Thames Water’s Website (Thames water is responsible for sewer maintenance in London, England) about a “fatberg” comprised of cooking oil, wet wipes and more which was roughly the size of a Boeing 747. In our weekly global meeting, many on the call contributed to the discussion because in almost every pump markets globally, our customers have to manage either issues relating to cooking oil or solids in the sewer system. The manufacturers of wet wipes worldwide have said that they are researching and developing new products that will help to reduce the clumping issue. But the primary contributor to this problem is not the wet wipes; no one should be dumping cooking oil down the drain – ever. As the YAHOO! article says, when you dump hot cooking oil down the drain into the cold sewer system the fat congeals and clings to anything including the wipes, toilet paper or other solids.
Related: Thames Water Press Release about the “Fatberg”
Here is North America; municipal wastewater treatment operators routinely voice their concerns to us about the use of wet pipes by the general public and then flushing them down the toilet. “Do you guys make a pump that can better handle the wet wipes” is a question Wastecorp frequently receives at our sludge pump call centers. Jim K. from Winston Salem North Carolina tells it like it is:
“ All these wet wipes that come into our mid-size WWTP are wreaking havoc on our pumps. We use rotary lobe pumps and progressive cavity pumps and they just clog them causing them to fail and then thousands worth of damage. We need to go a different route. Our city engineer was looking at Wastecorp’s website and suggested we ask about either your plunger pump or double disc pump options.” We need some guidance here please.” Jim K. – Winston Salem, NC
Well Jim, the rotary lobe and progressive cavity companies will sell you the same story: go with our pumps – they’re new. They are leaving out an important fact most lobe and progressive cavity pumps have been around just as long as plunger pumps, (+- 75 years) and most of lobe and progressive cavity pumps don’t do a good job of handling solids. When it comes to plunger pumps, they are a lot less likely to clog. The check balls and pistons move sludge and wet wipes and send them on their way. You should also consider a screen and a grinder in your WWTP process, but having a pump more capable of handling solids will go along way.
Jim, like your city engineer said, many WWTP’s your size have selected either a plunger pump or a double disc pump to manage these wet wipes. We see a lot of facilities your size going the route of the Sludge Master® PE-941 SSIII or our Sludge Pro® 4DDWP™ Double Disc Pump Series. Unless your facility has an endless budget to keep replacing rotors, stators and bearings your facility would be wise to consider other pump options. More info can be found at www.wastecorp.com
Related: Waste oil pumps and containment systems
Space Saver Plunger Pumps
It’s a common problem faced by many wastewater treatment facilities’, how to select a pump to move heavy sludge with enough power and endurance to last through the long haul. One solution to this problem is a pump with an in-line piping design like the Space-Saver plunger pump. Many facilities have seen success with this pump especially those replacing a double disc, rotary lobe, or progressive cavity pump.
The Space saver plunger pump does not require a concrete base, which makes replacing any type of sewage pump quick and trouble-free. In most cases, the old pumps are simply replaced and the new Space Saver simply dropped into place. The Space Saver is available with a 7”, 9” or 11” piston size and can transfer up to 140 GPM (8.8 lps) of municipal or industrial sludge.
In our case study feature, you’ll see a Memphis, Tennessee area sewage treatment plant which recently installed a Space Saver after trying double disc and progressive cavity pumps. The facility operates this pump for at least eight hours each day and other than general maintenance procedures, the pumps have run perfectly. Click here for more information on the Space Saver sewage pump.