Water / Wastewater Treatment Wastewater Treatment Plant Reduces Foaming & Filaments
The mechanism of many foam control products is to add hydrocarbon or silicone oils that are hydrophobic. These products work with surfactant induced foams and polysaccharide induced foams caused by nutrient deficiency. However, foaming due to Nocardia-form and Microthrix filaments are quite different in nature and require a defoamer that is chemically different. These filaments are hydrophobic and are typically present when high FOG concentrations and/or fatty acids are present at significant concentrations. Hydrocarbon and silicone oils can actually make the problem worse.
QM Environmental Services (The Netherlands) offers several products that can be used to combat these filament induced foam types.
MICROCAT-DF is a glycol based defoamer optimised for this type of microbial foam. The defoamer
helps to break-up the tangled filament mass in the foam and disperse the filaments to accelerate washout. If a slug of MICROCAT-DF is added to a well mixed area of the aeration basin or the RAS, the foam can be knocked down in minutes. If it is metered in at the low dosages required for control, it may take one hydraulic retention time to dissipate foam over the aeration basin. MICROCAT-DF also works in both aerobic and anaerobic digesters where foaming is caused by filaments (usually over-growing in the mixed liquor of the aeration basin).
MICROCAT-DNTRF is a fat, oil and grease degrading bioformula that can be used to quickly degrade FOG and fatty acids on which the Nocardia-form and Microthrix filaments grow. By effectively reducing the FOG concentration the filaments have less food to grow on and will be reduced in their concentration which results in the disappearance of the foam. This generally will take a bit more time than when using MICROCAT-DF but on will have a more lasting effect. Both MICROCAT-DNTRF and MICROCAT-DF can be used together to have a direct foam removal and a long term solution.
MICROCAT-XF is formulated to reduce filamentous microbe populations, improve sludge settling and reduce effluent suspended solids. When used on a preventive maintenance basis, this product can enhance overall system performance while reducing operating costs. MICROCAT-XF contains a combination of aerobic and facultative anaerobic microorganisms selected from nature for their ability to break down a broad range of substances encountered in domestic and food processing wastes. It also contains enzymes and other ingredients selected to destabilise the protein sheath protecting many filamentous forms. Reducing the filament concentration will reduce the foaming. Both MICROCAT-XF and MICROCAT-DF can be used together to have a direct foam removal and a long term solution.
Case Study A municipal waste treatment plant, with a flow of 1315 m3 /day, was receiving excessive FOG in the influent wastewater and experienced foaming in the aeration ditch. A daily application of 0,9 kg per day MICROCAT-DNTRF is made directly into the aerated portion of the oxidation ditch system.
MICROCAT-DNTRF Fat, Oil and Grease Degrading Bioformula did an excellent job in reducing the foam and filaments, reestablishing a healthy biomass, increasing clarifier settling rates and reducing effluent TSS and BOD. Recent reports from other municipal wastewater treatment plants demonstrated that the use of MICROCAT-DNTRF could reduce foaming already after 2 days.
Reader Reply Card No 22
New Sewer System Solution
The new pre-built Muffin Monster®
Manhole from JWC
Environmental (USA) is a sewer system solution for rags, rubbish and debris that clog sewer lines and pump stations.
Muffin Monster Manhole, nicknamed the M3, includes everything in one ready to install package: a pre-built fiberglass reinforced polyester (FRP) manhole; a Muffin Monster grinder; guide rails; access ladder; inlet and outlet pipeline connections and a manhole or hatch-type access lid. The low-speed, high-torque grinding turns troublesome solids into small particles that easily
pass through sewer lines and pumps. The legendary Muffin Monster is installed in over 25,000 locations world-wide.
“Customers call us every day asking for help to protect sewer pumps from clogging,” said Gary Smith, Grinder Team Manager for JWCE. “With the M3 we offer a complete package that is easy to purchase, easy to install and easy to use. The customer simply digs down to the sewer line, drops in the M3 and covers it back up. That’s it – you’re grinding sewage.”
New Quiet, Compact Piston Pumps for Mobile and Industrial Applications Released
Parker Hannifin (UK) as expanded its range of high performance P1/PD hydraulic pumps still further with the introduction of 18, 28 and 45cc models. The new piston pumps increase the existing range of 60, 75, 100 and 140cc models, making the P1/PD Series suitable for use in and even wider variety of medium duty mobile (P1) and industrial and marine (PD) applications.
Rated for continuous operation at pressures up to 280 bar, the P1/PD pumps incorporate a number of innovative features to improve performance, reliability and efficiency. For example, low flow ripple minimises noise, while SAE and ISO standard mounting flanges and ports, with a choice of end or side inlet and outlets, make installation quick and simple.
An extensive range of options extend the overall functionality and use of the piston pumps still further. These include standard pressure limiters, with or without torque control, and load sensing with pressure limiter and/or torque control. There is also the option for pilot operated pressure limiters with a choice of an ISO 4401 interface, mechanical adjustment and vent port, and electrical adjustment.
Reader Reply Card No 23
JWCE representatives and inside technical sales staff are trained and experienced in advising, designing and building in-line or in-channel sewage grinders for unique and challenging locations. Muffin Monster grinders can be installed almost anywhere – and they have. Simply ask your local JWCE rep to tour the location and we’ll do the rest.
The Muffin Monster includes many of JWCE’s exclusive features: an immersible motor; automated controller; sharp steel cutters with 60+ Rockwell hardness and the industry’s best service plan – the JWCE grinder exchange program. The only maintenance on the M3 is a semi-annual inspection.
The M3 holds a Muffin Monster model 30005- 0012 grinder and handles flow up to 350,000 gallons per day (110 m3
/h). The M3 is bolted to a concrete
pad installed by the end user. The 4’ (1.2m) circular manhole can be built for a depth specified by the customer up to 30’ (9m). The inlet and outlet pipeline sizes are made to fit the sewer line. The customer may choose either a hinged lockable lid or a conical top for installation in roadways. The M3 is rated for loads exceeding H-20 requirements.
The FRP material adds incredible strength to the manhole while also making it watertight and corrosion resistant – important features for today’s high strength sewage. JWCE also stands behind both the Muffin Monster and the manhole with the industry’s best warranty coverage.
Reader Reply Card No 24
Reader Reply Card No 25 8
www.pollutionsolutions-online.com • February / March 2011
When contacting companies directly from this issue of Pollution Solutions please tell them where you saw their product.
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