Wastewater Monitoring and Control

Water is crucial for life. Not only is it crucial to human health, but it also provides vital ecosystem habitats for fish and is essential for crops and livestock. Water plays a large role in the recreation industry, with many activities relying on the cleanliness and safety of natural recreational water facilities, be they lakes, rivers or beaches. Wastewater monitoring ensures that treated water released back into the environment does not cause damage to this precious resource.

Xylem has a history as a trusted partner of both the municipal and industrial wastewater industry, providing something much more valuable than just monitoring equipment and systems to ensure reliable plant operation and compliance: expertise.

A deep and comprehensive understanding of the processes used from inlet to plant through to final discharge enables Xylem to consider a holistic approach to the plant, incorporating not only discharge compliance and isolated process basics but both energy and manpower efficiencies.
Effective and efficient control is not possible without a full understanding of process performance and changes in load. This understanding cannot be reached without accurate monitoring of key parameters throughout the process. The accuracy of the measurements cannot be assumed, but required validation. Xylem is able to provide the full suite of instrumentation and knowledge to ensure that all of the needs listed above are met.

In many wastewater treatment plants, a large percentage of the energy budget is consumed in processes requiring aeration, for example activated sludge processing plants. Such plants treat wastewater in a biological manner, i.e. both aerobically and anaerobically to break down the ammonia content into nitrate and, ultimately, nitrogen.

Typically, these plants are controlled based on a dissolved oxygen setpoint alone based on single measurements within each treatment lane. This prevents the plant from effectively reacting to changes in load, resulting in either expensive over-aeration or discharge consent failure and hydrogen sulphide production due to under-aeration.

WTW IQ SensorNet range of sensors

By monitoring the influent ammonia and mixed liquor suspended solids (MLSS), as well as the process dissolved oxygen (DO) levels and nitrate levels within the plant, the blowers can be controlled in real time to ensure the optimum oxygen level is identified and delivered for the condition of the process liquor currently being treated.

The IQ SensorNet system has been developed with the both accuracy and operator efficiency in mind. The removal of wipers in favour of integral ultrasonic cleaning within the MLSS sensor for example means there are no blades or seals to replace, no moving parts to foul and no paths of water ingress should a seal be replaced improperly. Similar thought has been applied to Xylem's optical DO sensor the FDO. By mounting the membrane at 45 degrees the potential for a flat surface to catch bubbles and sludge and hence produce false readings is greatly reduced. This again reduces the frequency with which an operator will need to inspect and clean the sensor - a fact borne out through our experiences across the world.

Alongside Ammonia, additional compounds and elements are also heavily regulated at the point of discharge. Phosphorous can lead to the eutrophication of waterways; this causes algae to form and the bacteria within the algae use up the oxygen within the water, leaving it depleted for fish and other wildlife.

Phosphorous removal is often carried out by precipitation: a coagulant is mixed with the wastewater (often calcium, aluminium or iron based) to precipitate the phosphorous. The use of chemicals in this process is costly both in terms of shipment and carbon footprint; the chemicals themselves are hazardous and require careful handling and over-use of the chemicals results in increased sludge volumes which require additional transport and treatment alongside running the risk of carry-over of the chemical into discharge. It is therefore very important to be able to accurately dose the coagulant based on the load within the process.

The self-calibrating Xylem P 700 IQ, part of the IQ SensorNet range, can be installed directly on to a handrail and can cope with all weather conditions, whilst also being compact and is designed to use a fraction of the reagent typically required for wet chemistry analysis. This enables phosphorous measurements to be made more frequently allowing a more complete understanding of plant function and better control of chemical dosing, another example of Xylem's drive for both accuracy and operator efficiency.

The WTW IQ SenorNet range is modular in construction. Sensors and control units may be installed around a large site and can be connected to each other to form a single network, either through our advanced cabling or multi-hub wireless. The full range of communication protocols are available for communication back into the site control system: the classic analogue and relay combination, Profibus, Modbus, Ethernet etc. Should the communications requirements change at a site using the SensorNet, the network can remain in place. Only the communications modules need to be exchanged to go from analogue to Profibus. This helps to simplify network upgrades thereby reducing downtime and cost to the user.

Environmental Responsibility and Accountability

Regulatory compliance is becoming increasingly tightly policed across the globe and providing samples of wastewater at both influent and effluent to a treatment plant is critical in demonstrating compliance, both during internal audits and in routine inspections.

There are requirements within the wastewater industries to not only sample and monitor effluent parameters but also to produce, on demand, discharge monitoring reports. Such reports should illustrate compliance with effluent discharge parameters and proper operation and function of the plant (through monitoring of process data), and there should also be a log of any emergency operations carried out or failures of the plant. Such reports will indicate not only effluent parameters but also discharge flow rates with date and time stamps.

The ProSample range of sampling equipment offers fully automated portable sampling units. They are lightweight and easy to use, even in inconvenient spaces around the plant. The peristaltic pump, incorporated in the units, allows highly accurate sampling based on time, flow or event. In such a regulation-driven environment, traceability and accountability are high priorities.

The Storm package from Xylem allows data from the data loggers to be transferred to the Storm Central cloud data network. From here the client, or Xylem support staff, can log in and track data from the system. The data can also be downloaded for subsequent investigations, trending and producing compliance reports. Continuous online monitoring of effluent quality allows the operator to control the treatment plant so that it meets compliance targets, or to shut down the plant should a fault occur.

Your Partner in Compliance

In the interests of protecting the precious resource of water, both as an ecosystem habitat and as a crucial element to life, monitoring of wastewater allows industries to prevent unintentional discharges that could damage ecosystems and the native species living there. After all the reuse of water is something that we all must consider, it being an increasingly sought after resource.

Unregulated non-compliant discharges could lead to contaminated water making its way into irrigation systems and water supplies used for washing and watering livestock and, eventually, into the human food chain.

It is the responsibility of plant operators and managers to ensure that they are doing all they can to protect and preserve this crucial commodity. Xylem products and services provide operators with modern, flexible, reliable and easy-to-use tools to fulfil these responsibilities and to operate their plants at optimum efficiency and efficacy.

Solutions by Application

  • Online Monitors
  • Online Sensors
  • Handheld
  • Effluent Monitoring
  • Samplers
  • Case Studies
  • Related Documents
181

WTW IQ SensorNet 181

  • Low-cost alternative to analog measuring points
  • Matching digital IQ fixed cable sensors for pH/ORP, conductivity, O2 and turbidity
  • Stable, robust and proven measuring technology

MCERTS certified

wtw_282

WTW IQ SensorNet 282

Controller for small and mid-sized wastewater treatment plants including USB-interface and internal data logger – up to 4 sensors, all parameters, available anytime.

  • All parameters available (O2, NH4, NO3, COD, PO4, sludge level)
  • USB-interface and internal data logger by default
  • Convenient and available anytime via Ethernet-interface

WTW 2020XT with junction boxes

WTW IQ SensorNet 2020 XT Controller

With an easily scalable solution, the 2020 XT allows for the connection of up to 20 sensors. This modular plug-and-play system allows you to monitor the water quality in your wastewater system continuously and accurately.

MCERTS certified.

WTW CarboVis Spectral Sensors

WTW CarboVis Spectral Sensors

The chemical-free spectral measurement allows a precise determination of the COD and nitrate level.
Whether influent, biological tank or effluent, the self-cleaning sensors CarboVis provides:

  • High measurement reliability
  • Low operating costs
  • Simple handling
  • Maximum durability

UV 700 IQ SAC

WTW UV 700 IQ SAC

The SAC sensor measures Spectral Absorption Coefficient (SAC) and UV transmission (UVT) at 254nm for determination of organic loads in water. With the  sensor UV 700 IQ SAC this parameter can be detected directly without any chemicals. A reference measurement is performed for compensation of turbidity influences.

WTW VisoTurb®

WTW VisoTurb® 700 IQ & ViSolid® 700 IQ Sensors

With the VisoTurb® 700 IQ and ViSolid® 700 IQ sensors, WTW presents a family of optical sensors for turbidity and suspended solids measurement. These sensors incorporate a ultrasound cleaning system that guarantees low maintenance and long-term reliability of the sensors. Turbidity measurements in aqueous media with VisoTurb® are carried out nephelometrically in compliance with EN ISO 7027. Solid matter measurement with ViSolid® is performed according to the principle of scattered light measurement.

SensoLyt® pH/ORP sensors

WTW SensoLyt® pH / ORP Sensors

For continuous pH/ORP measurement, especially under the difficult conditions very often found in sewage treatment facilities, very high demands are made concerning the reliability and operating safety of the systems employed.

sludge-judge

Global Water - SLDG Sludge Judge®

The SLDG Sludge Judge® sampler is designed to take accurate readings of settled solids that are 5% or less in
a variety of liquids at any depth.

WTW MultiLine® IDS

WTW MultiLine® IDS

The new multi-parameter systems with intelligent, digital sensors for pH, dissolved oxygen (DO) and conductivity measurement revolutionize multi-parameter measurement:
The signal processing is completely located in the sensor, and the measuring signal is transmitted to the meter without interference and in a clearly identifiable manner via thin, highstrength cables. A wide range of sensors are available for virtually every application.

csm_wtw-600320-turb_430_ir-portable_turbidity_meter_d93e2e994f_001.jpg

WTW Turb 430 IR / Turb 430 T

  • Lab precision, suitable for drinking water
  • Adjustable calibration intervals and GLP-compliant documentation
  • Stray light behavior according to pharmacopoeia 5.0

royce-711

Royce Portable Suspended Solids Unit

  • Two complete analysers in one package (TSS & Interface Level)
  • Automatic ranging
  • Simple, insitu calibration
  • Electronic self-diagnostics
  • Waterproof, rugged housing

181

WTW IQ SensorNet 181

  • Low-cost alternative to analog measuring points
  • Matching digital IQ fixed cable sensors for pH/ORP, conductivity, O2 and turbidity
  • Stable, robust and proven measuring technology

MCERTS certified

182XT-4

WTW IQ SensorNet 182

  • up to 4 digital IQ sensors can be connected
  • Analogue version with up to 5 power outputs and 6 relays
  • Digital outputs PROFIBUS or MODBUS RTU available as options

MCERTS certified

Our latest instrument, the WTW 282 has superseeded this product.  Click here for the lastet information

Alt: WTW photoLab® 7600 UV-VIS

WTW photoLab® 7000 Series Spectrophotometer

  • Menu-guided operation
  • Opt-RF, Optical Reagent-Free measurement, for COD, NO3, NO2 in municipal wastewater final effluent
  • Multi-layer AQA
  • Application support
  • Comprehensive programming opportunities
  • Colour Applications

WTW 2020XT with junction boxes

WTW IQ SensorNet 2020 XT Controller

With an easily scalable solution, the 2020 XT allows for the connection of up to 20 sensors. This modular plug-and-play system allows you to monitor the water quality in your wastewater system continuously and accurately.

MCERTS certified.

WTW CarboVis Spectral Sensors

WTW CarboVis Spectral Sensors

The chemical-free spectral measurement allows a precise determination of the COD and nitrate level.
Whether influent, biological tank or effluent, the self-cleaning sensors CarboVis provides:

  • High measurement reliability
  • Low operating costs
  • Simple handling
  • Maximum durability

 mjk-magflux-1600_001.jpg

MJK MagFlux® Flowmeters

MagFlux® Flowmeters are developed for measurements in all types of conductive liquids, including measurement of flow in drinking water, wastewater, sludge and process water. MagFlux Flowmeters are manufactured with carbon steel and stainless steel for flange or wafer connections and lining in hard or soft rubber and PTFE/PFA.

UV 700 IQ SAC

WTW UV 700 IQ SAC

The SAC sensor measures Spectral Absorption Coefficient (SAC) and UV transmission (UVT) at 254nm for determination of organic loads in water. With the  sensor UV 700 IQ SAC this parameter can be detected directly without any chemicals. A reference measurement is performed for compensation of turbidity influences.

WTW VisoTurb®

WTW VisoTurb® 700 IQ & ViSolid® 700 IQ Sensors

With the VisoTurb® 700 IQ and ViSolid® 700 IQ sensors, WTW presents a family of optical sensors for turbidity and suspended solids measurement. These sensors incorporate a ultrasound cleaning system that guarantees low maintenance and long-term reliability of the sensors. Turbidity measurements in aqueous media with VisoTurb® are carried out nephelometrically in compliance with EN ISO 7027. Solid matter measurement with ViSolid® is performed according to the principle of scattered light measurement.

SensoLyt® pH/ORP sensors

WTW SensoLyt® pH / ORP Sensors

For continuous pH/ORP measurement, especially under the difficult conditions very often found in sewage treatment facilities, very high demands are made concerning the reliability and operating safety of the systems employed.

WTW MultiLine® IDS

WTW MultiLine® IDS

The new multi-parameter systems with intelligent, digital sensors for pH, dissolved oxygen (DO) and conductivity measurement revolutionize multi-parameter measurement:
The signal processing is completely located in the sensor, and the measuring signal is transmitted to the meter without interference and in a clearly identifiable manner via thin, highstrength cables. A wide range of sensors are available for virtually every application.

ysi_prosample_p_open_001.jpg

YSI ProSample Autosampler

The NEW ProSample series of fully automated portable samplers expand our process monitoring and control equipment offering. These lightweight and easy to use samplers come with a proprietary peristaltic pump for highly accurate sampling based on time, flow, or event. The ProSample series has extremely high volume accuracy to keep your facility in compliance.  The ProSample series is most commonly used in stormwater and storm event sampling, influent and effluent wastewater treatment, collection systems for industrial pre-treatment and any time based sampling requirements. The ProSample series provides a unique combination of design and technology.

ysi_prosample_p_open_001.jpg

YSI ProSample Autosampler

The NEW ProSample series of fully automated portable samplers expand our process monitoring and control equipment offering. These lightweight and easy to use samplers come with a proprietary peristaltic pump for highly accurate sampling based on time, flow, or event. The ProSample series has extremely high volume accuracy to keep your facility in compliance.  The ProSample series is most commonly used in stormwater and storm event sampling, influent and effluent wastewater treatment, collection systems for industrial pre-treatment and any time based sampling requirements. The ProSample series provides a unique combination of design and technology.