Flow Control/Monitoring, Stormwater Treatment and Pretreatment

Flow Control/Monitoring, Stormwater Treatment and Pretreatment
Multiple-path flowmeter

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Catch basin risers

Catch basin risers from American Highway Products eliminate debris falling into collection systems causing backups, reduce costs, and streamline the adjusting of utilities to the new grade when paving roads. Heights start at 3/4-inch rise and increase in 1/4-inch increments. Inclined risers are available. The type 1 and type 2 risers are easy to install, and will not break from installation forces or uneven manhole frames. Custom designs are available. 888/272-2397; www.ahp1.com.

 

I&I barrier

The I&I barrier from AP/M PERMAFORM is designed to stop water from leaking into manholes through grade rings. The weather- and puncture-resistant unit is made of polyethylene, and forms an interior wall that stops water from infiltrating. Once installation is complete, there is no need for further adjustments. No adjustable bands are used to hold the unit in place. 800/662-6465; www.permaform.net.

 

Battery-operated meter

The M5000 mag meter from Badger Meter delivers flow measurement information for general-purpose detection. The battery-operated unit comes in a low-maintenance stand-alone package and is suitable for a wide range of utility and industrial applications. It can be used to measure well water, wastewater, reclaimed water and bidirectional flow applications that have minimal electrical conductivity. Built for field verification testing with the use of a simple handheld device, the meter can achieve an accuracy of ±0.5 percent and a flow range better than 300:1.

The meter combines a detector and an amplifier. The flow detector has no moving parts in the flow stream, which prevents pressure loss and keeps maintenance to a minimum. The amplifier can be integrally mounted to the detector, or it can be mounted remotely. Housed in a NEMA 4X (IP66) enclosure, the amplifier targets a variety of applications. 800/876-3837; www.badgermeter.com.

 

Multiple-path flowmeter

The Model 7720 Transit-Time flowmeter from Accusonic Technologies addresses difficult installation requirements common to large UV disinfection systems. The maximum 10-path capability allows the unit to measure with accuracy and repeatability, even in the presence of distorted flow profiles. The pipe section length required for installation is less than for other flow measurement technologies, according to the manufacturer. Measurable pipe and channel sizes range from 8 inches to 600 feet. Using multiple-path, chordal, transit-time technology, accuracy is ±0.5 percent in full pipes and ±2.0 percent in partially full pipes and channels. 508/273-9600; www.accusonic.com.

 

Leak correlator

LeakFinderRT from Echologics is a Windows-based acoustic leak noise correlator that pinpoints quiet narrow-band leaks on water and wastewater mains of all materials including ductile iron, pre-stressed concrete cylinder pipe (PCCP), plastic (PVC) and asbestos cement (AC). Its advanced hydrophones and enhanced correlation function improve municipalities’ ability to accurately identify and locate narrow-band leak noise. The system is well designed for plastic pipes, multiple leak situations, and scenarios where there is a large amount of background noise or where leak sensors have to be closely spaced. 866/324-6564; www.echologics.com.

 

Multiple velocity flowmeter

The FlowShark Triton flowmeter from ADS Environmental Services offers multiple velocity and depth measurements for accuracy in standard and challenging hydraulics. It is a fit-for-purpose monitoring device, with intrinsic safety as the standard. The unit offers simplified software with Qstart, which can be downloaded from the company website. It allows setup, activation and collection in a few minutes, and has viewing options that enhance data accessibility. The flowmeter sensors offer versatility, redundancy and multiple technologies for continuous running of comparisons and tolerances.

Options include the peak combo sensor with peak Doppler velocity, an uplooking ultrasonic depth, and pressure depth all-in-one housing for versatile, economical measurement across a wide range of hydraulics. The surface combo sensor includes surface velocity, downlooking quadredundant ultrasonic depth, pressure depth, and surcharge continuous wave velocity. An all-in-one housing stores the four technologies, allowing all measurements of depth and velocity to take place without the need to install a separate sensor. The quadredundant ultrasonic sensor is also available as an option. 800/633-7246; www.adsenv.com/triton.

 

Chlorine dioxide analyzer

The CDA-22 chlorine dioxide (ClO2) analyzer from Electro-Chemical Devices includes a panel mounted plumb-and-play design and automatic flow control in a low-maintenance complete measurement system. The unit measures ClO2 concentrations from 0.05 to 20 ppm. Easy to install and maintain, the analyzer incorporates a ClO2 sensor, automated flow control device and analyzer/controller mounted on a PVC panel.

Installation is complete after connecting the sample and drain lines, power and outputs. It can run for up to one year between electrolyte/membrane changes. The unit features a polarographic gold/silver PTFE membrane amperometric ClO2 sensor, which is flow-sensitive. Output is almost flow-independent at values greater than 0.5 ft/s. 800/729-1333; www.ecdi.com.

 

Level measurement

The Prosonic S FDU90 ultrasonic level sensor from Endress+Hauser is designed for small measurement ranges up to 100 feet of liquid depth, and is used for measurements in open ponds, flumes, and sewer system weirs. The low profile and reduced blocking distance allows use in confined spaces. An optional submergence shield protects the sensor membrane from contamination and provides a reliable evaluation of flood events in conjunction with the unit’s evaluation. A separate transmitter makes the sensor suitable for harsh environmental conditions. Setup can include an active flooding alarm. It is designed for level measurement at rain overflow basins. 888/363-7377; www.us.endress.com/level.

 

Electromagnetic meter

The WATERFLUX 3070 electromagnetic water meter from KROHNE offers a flow sensor construction with a rectangular, reduced cross section and efficient coil construction. The coils provide a strong homogeneous magnetic field, leading to an improved signal to noise ratio. The measurement is independent of the flow profile and measurements are very stable.

The mean flow velocity and flow profile are optimized within the rectangular and reduced cross section, reducing uncertainty for upstream disturbances. The meter can be installed directly after an elbow or reducer in the pipe without straight inlet or outlet lengths. A reduction of inlet and outlet sections means smaller measurement pits. The unit also offers low power consumption of the signal converter. 800/356-9464; www.krohne.com.

 

Data management

FACE (FlowWorks Advanced Calculation Engine) from FlowWorks is a one-stop data management platform. The system offers real-time data analysis across multiple hardware platforms, and a complete suite of graphical editing QA/QC tools. FlowWorks collects data from all SCADA systems and from USGS and NOAA environmental stations.

FACE is a set of real-time data calculation tools, allowing users to create new data channels from incoming channels using advanced algebra, statistics and logic equations. The editing tools combine real-time data manipulation with an easy-to-use graphical interface. Analysts can highlight data directly on time-series or scatter graphs, or in tables, and then flip to a simple editing screen to make short work of common editing functions. 206/859-6999; www.flowworks.com.

 

Velocity flowmeter

The FH950 portable velocity flowmeter with electromagnetic sensor from Hach simplifies the velocity measurement process for stream discharge measurements, primary device calibration and sewer spot-check measurements. Step-by-step instructions guide the user through the flow profiling process, and field time is shortened with the ability to log velocity and entered depth information within the meter. Real-time discharge calculations are available, and collected flow data is downloaded to a computer via USB connection, eliminating post-site visit manual data transfer and calculations.

The electromagnetic sensor can be disconnected from the meter, has no moving parts and never requires mechanical maintenance or calibration. The meter is a direct replacement for USGS type mechanical meters. 800/368-2723; www.hachflow.com.

 

Double clarification

The BIOACTIFLO system from Kruger USA combines contact stabilization and microsand ballasted clarification to produce high-quality treatment of wet-weather flows. Return activated sludge (RAS) from the existing clarifiers is combined with the excess flows into a solids contact tank. A targeted mixed liquor suspended solids (MLSS) concentration is maintained in the contact tank to facilitate rapid uptake of soluble biological oxygen demand (BOD) via contact stabilization followed by ACTIFLO clarification.

The combination of the two results in total BOD removals in excess of 85 percent, 95 percent TSS removal and total phosphorus levels of less than 0.15 mg/L. Existing ACTIFLO installation for wet-weather flows can be converted to BIOACTIFLO and the ACTIFLO train can also be used for tertiary treatment during dry-weather flows. 919/677-8310; www.krugerusa.com.

 

Submersible level transducers

TruBlue submersible level transducers from Measurement Specialties measure water level and quality. The transducer has an 8 MB internal memory and can store up to 55,000 level and temperature measurements. Its internal 3.6-volt lithium battery with onboard surge protection has a 5-year lifespan, based on four readings an hour. Sampling modes include linear, linear averaging and event, with programmable sampling rates of up to five per second. The transducer is available in full scale water level ranges from 0-11.5 to 0-658 feet (5-300 psi) and has an operating range of 32 to 122 degrees F. 800/328-3665; www.trubluemonitor.com.

 

Full-profile flowmeter

The FPI Mag (full-profile insertion) flowmeter from McCrometer with hot tap installation is a scalable solution to measuring and monitoring variable runoff flows. The flowmeter installs without interrupting service, dewatering lines, cutting pipe or welding flanges. The unit is an economical flow metering solution for medium and large line sizes.

The meter is available for line sizes from 4 to 138 inches, and features accuracy of ±1 percent of reading ±0.03 ft/s zero stability from 0.3 to 20 ft/s velocity range. The flow sensor is pre-calibrated in the company’s NIST traceable calibration lab and requires no field recalibration. Applications include wells, booster stations, filter balancing and backwash, pumping stations, UV dosing and potable water distribution. 800/220-2279; www.mccrometer.com.

 

Portable sludge detector

The Sludge Gun from Markland Specialty Engineering is a portable sludge level detector used to find the sludge/sand interface in stormwater pretreatment systems. It can also be used in primary and secondary clarifiers, DAFs, settlement tanks and lagoons. Power intensity is adjustable for sludge densities ranging from light flocs to thick blankets. No calibration is required.

A spring-loaded trigger turns on the gun, and a thumb-adjustable sensitivity control compensates for thin or thick sludge. A tone is emitted as the optical probe enters the bed, varying in volume and pitch depending on concentration of solids. By observing the depth markers on the cable, the operator establishes the location of the sludge blanket and the overlying unsettled cloudy layer. After use, the cable is wound at the self-storing spool at the front of the gun. 905/873-7791; www.sludgecontrols.com.

 

Monitoring software

Telogers Enterprise software and Ru-33 remote telemetry unit from Telog Instruments offer a complete monitoring, data collection and reporting solution. The telemetry unit provides real-time monitoring and alarming of instruments and sensors, even in the harsh environments of sewers and underground water vaults. It forwards data wirelessly to a host computer over 1xRTT or GPRS networks, so no telephone lines are required. The Ru-33 can operate for six months to a year on a 6-volt lantern battery, eliminating hard-wired power sources.

Once the data reaches the host computer, Enterprise provides users with immediate access to the information for analysis and reporting. Real-time information and easy-to-use templates help users create reports. The software also aids in the use of modeling programs, helping municipalities predict CSO events and their potential hazards to adjacent waterways, beaches, and public or private lands. 585/742-3000; www.telog.com.



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