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ENDRESS+HAUSER, INC

Waste Water Treatment: Integration of Field Instruments into Process Control
Range of Products and Services: Data acquisition, Pressure Flow, Level Measurement, Open Channel flow, Liquid analysis
Biological Treatment: Removal of Ammonium, Nitrates, and Phosphates, Sludge Treatment and Sludge Management
Optimizing Water Distribution Networks and Groundwater Solutions
Fresh Water Treatment Processes
Flocculation, sedimentation filtration, Water Storage Solutions



Solutions for Process Control, Pressure, Level And Flow Measurement, Liquid Analysis, Nitrates Phosphates Removal Optimizing Waste Water, Fresh Water and Sludge Treatment Processes, Water Distribution Networks and more


Modern water management

Endress+Hauser takes up the challenge as a leading producer of measuring technology. We are your partners in the areas of maintenance strategies and calibration services. We are involved in innovative communication technologies such as Fieldbus or e-commerce, right up to overriding topics such as consulting and engineering services. We are also your partners when the topics require competent people at your side for all matters concerning measurement and control technology.

Waste Water treatment

Increasing industrialization and population growth has caused tremendous contamination of surface waters during the last decades. As a consequence, the laws regarding environmental protection have been tightened in many countries. To fulfill these regulations means increasing the number and the efficiency of waste water treatment plants. Today it is necessary to use ongoing treatment processes and control them by means of measurement and control systems. In-service monitoring has become more extensive and diverse. Waste water treatment not only includes operating, supervising, servicing and repairing equipment, it also involves the key topics of operational flow, monitoring and controlling, measuring, analyzing, recording and evaluating. This ensures that the key processes, the reduction of hydrocarbons, of nitrate, ammonium and phosphates are carried out in a most efficient way in large as well as in small treatment plants.

The driving factor in today’s investment in waste water treatment must be cost reduction. The only way to maintain high standards while reducing costs is to invest in highly sophisticated measurement and process control technology, ideally from a supplier offering the whole basket of instrument

From integration to automation

With the introduction of communication technologies like HART ®, PROFIBUS ® and FOUNDATION ™ Fieldbus a little more than ten years ago, the barriers between field instruments and the system level began to disappear. The instruments became more intelligent and an integral part of the automation architecture. Because we recognized this development at an early stage Endress+Hauser has been actively involved in different standardizing bodies and user organizations since the beginnings of fieldbus technology. In this way, we want to ensure that our customers stay in touch with new trends.

A fieldbus connection offers much more than a process variable from a field instruments. Instrument status, maintenance and diagnostic information are available to be transferred from the process to the control room. This information makes it possible to increase the availability of the plant and to optimize processes. Endress+Hauser ensures the integration of this information into the system environment.

To this end, we support both technologies that are established in the market as well as the new FDT integration technology for Plant Asset Management. FieldCare is a Plant Asset Management solution offering commissioning, condition monitoring and access to diagnostic information from the digital process instruments. In addition, we offer comprehensive engineering services for the integration of field instruments into all relevant process control and asset management systems in the process industry. Field instruments are the source of the information to be measured in order to perform wastewater treatment. Endress+Hauser can keep the process running by monitoring process complications due to inlet water flow and pollutant variations while helping to maintain effluent standards. Plant supervision and control are useful tools in performing the treatment process in order to improve efficiency and save energy, reagents and other direct costs.

The key is obtaining representative measurements as closely as possible to the true process control conditions. Filtering and sampling systems used in conjunction with smart analyzers and plant supervision tools from Endress+Hauser can aid in improving the efficiency of the waste water treatment process control. Our solution concept embraces these aspects, and if desired, automatic measuring stations can be supplied on specific designs. With Endress+Hauser, those involved in procurement and engineering can be confident in the knowledge that we have your needs in mind during start-up and commissioning of your flow, level and pressure measuring point requirements.




 Measuring Devices

 Industrial Process Control

A range of services to suit your needs

Optimizing processes with an analysis of the installed base

Operators of industrial water treatment plants find themselves increasingly under pressure to reduce costs. This involves optimizing processes, focusing on core processes. Water treatment is also subject to this trend. Safety, time and quality are becoming increasingly important.
Optimal performance of measurement processes is essential to plant availability and product safety.

Instrument Management Solutions

Instrument Management Solutions (IMS) is an efficient, cost-effective process that optimizes the installed base.

The advantages are:

  • Increased plant up time
  • Emergency planning
  • Quick availability of spare parts
  • Reduction of maintenance costs
  • Documentation, including electronic records

The basis for Instrument Management Solutions is a plant audit of the installed base. Endress+Hauser evaluates and documents the measurement system and its condition. This results in the definition of the critical parts of the plant, the discovery of optimization possibilities in spare parts inventories, type reduction, phase-out planning and recommendations in a detailed maintenance plan.

Preventative maintenance

Endress+Hauser also offers support in the form of additional services such as:

  • Calibration service on site or at the factory, in one of our accredited laboratories
  • Maintenance contracts for the installed instrumentation
  • Start-up
  • Training — customer-specific content, content on demand (service, basics in measurement technology and/or industries)
  • Repairs on-site or at the factory
  • Spare parts service and consultation in the selection of components
  • Instrument rentals as a means for making decisions prior to purchase or for mobile temporary measurement requirements

Summary

Endress+Hauser is the full-range supplier for measuring technology:

  • Flow
  • Level
  • Temperature
  • Pressure
  • Analysis
  • Recording or system components
  • Services in the areas of calibration, maintenance, repair, commissioning and more

With our extensive product basket, Endress+Hauser have emerged as the only supplier able to meet all the instrumentation needs of today’s wastewater treatment facilities. Below are a few examples:

Flow measurement

PROline Promag 50W is an electromagnetic flow meter for applications wherever water flows! Our FieldTool software checks quality and documents the measuring point - it can be integrated into internal quality standards. PROline Prosonic Flow 90W is an innovative ultrasonic flow measurement with proven clamp on system. Flexible with diameters from 50 to 4000mm, the units can be installed quickly and without interrupting the process. The alternative to electromagnetic systems.

Liquid analysis

Liquisys M – an instrument for all parameters. Modular construction permits the measurement of pH / redox, conductivity, oxygen, turbidity and chlorine - the system is adaptable and can be easily retrofitted.

Stamosens CNS70 / CSS70
In-situ nitrate and SAC measurement - wet chemical, inline measurement for direct determination of nitrate/nitrite and organic loads in fresh water, process and wastewater. Low maintenance due to automatic cleaning function.

Stamolys CA71
Automatic analysis of ammonium, iron, manganese, aluminium by colourimetric methodology.

Level measurement

Waterpilot FMX 167 for hydrostatic level measurement 22mm. measuring cell diameter enables level measurement even in the smallest boreholes. The KTW, ACS and NSF certification, make it ideal for use in drinking water. Prosonic M performs a non-contact ultrasonic level measurement. Simple commissioning, complete diagnosis and easy operation are the benefit of this well established level meter from Endress+Hauser.

Open channel flow

Prosonic S: Contact less flow, level measurement with hermetically welded ultrasonic sensors and preprogrammed channel and weir configurations as well as pump control function.

Pressure measurement

Cerabar M: Pressure measurement with overload resistant ceramic measuring cell including function monitoring and dynamic measuring range.

Data acquisition

Videographic paperless recorder Memograph: Includes software package for wastewater applications. Programmable groups of signals. Highest protection level against manipulation.







BIOLOGICAL TREATMENT

Removal of Ammonium and Nitrates

The reduction of Ammonium and Nitrates is accomplished by a combined process called nitrification / denitrification (NH4 -> NO2 -> NO3 -> N2). Apart from temperature and pH value, the sludge age and concentration of degradable organic components is of importance. In order to use the full denitrification capacity of the treatment plant, a continuous measurement of the nitrate concentration at the outlet of the pre-located denitrification step is useful. The recirculation of the wastewater into the denitrification tank is controlled with this measurement very efficiently. A low nitrate value, measured at that location, means a most efficient degree of recirculation. This means cost savings. The measurement can be done using optical sensors Stamosens CNM 750/CNS 70.

Removal of Phosphates

A high concentration of phosphates in the effluent of a water treatment plant leads to significant algae growth in rivers and lakes. Because of this, phosphates must be eliminated during the water treatment process, by dosing chemical precipitants such as iron chloride into the waste water. Often, the contamination of the waste water with phosphates is not constant; therefore flow proportional dosing is not efficient. Continuous measurement of the phosphate concentration ensures optimized dosing of chemicals and helps to save money. Controlled removal of phosphates leads to reduced sludge development which means additional cost reduction in sludge treatment as well. Chemical analyzers such as CA 71 pH, including the sample preparation, measure the correct values needed for efficient dosing of the chemicals online.

SLUDGE MANAGEMENT

Process efficiency

In waste water treatment plants, large quantities of sludge must be handled. Sludge has to be removed in the primary clarifier, recirculated as activated sludge in the biology and separated from the treated water in the second clarifier. Most countries have very strict regulations regarding the maximum load of sludge particles in the effluent of the treatment plant. Getting rid of the sludge separated from the water is an important cost factor and will become more costly in the future.

Primary sedimentation tank

In order to ensure efficient water treatment, the primary sludge has to be removed. The task is to control a pump or slide valve. Most essential is to make sure that the sludge concentration is at least 1.5 to 2% DS (dry solids). A lower concentration will create tremendous costs in later stages of sludge treatment (e.g. sludge conditioning and dewatering). The CUS 41, an optical sensor, is most suitable for measuring the solids concentration directly in the sludge pipeline and can be used easily to switch off the pump at too low concentrations. For sludge level measurement in the primary clarifier, an ultrasonic device such as CUM 750/CUS 70 is highly recommended, since it does not come into direct contact with the difficult product and it has no mechanical parts that can be blocked.

Second sedimentation tank

Sludge collected in the second sedimentation tank is different from that in the primary clarifier. Pump control and concentration monitoring is important. Often there is additional functionality needed: the sedimentation behavior, the sludge quality and also the sludge age must be known.

This information can be determined by a sludge concentration profile. Such a profile can be determined with a CUC 101 unit, an optical sensor which measures the different sludge concentrations between the bottom of the sedimentation tank and the water surface.

Sludge digestion

The production of biogas in the digester leads to a reasonable cost reduction. Up to 60% of the electrical energy needed in the sludge treatment plant can be produced by biogas if the sludge is well conditioned. Sludge concentration, temperature and pH value have to be kept stable. The beginning of any sludge treatment is sludge thickening. This is carried out in static sludge thickeners, centrifuges or flotation cells. Primary sludge and excess sludge is mixed with a coagulation agent. By adding chemical additives, the pH value is maintained to ensure that the methane bacteria work most efficiently. Both parameters, pH and sludge concentration are measured online in the sludge digestion pipeline to the digester. The sludge is kept in the digester approximately 28 days at a temperature between 104° (40°C) and 122°F (50°C) according to the process used. During this time the sludge is permanently circulated. Under less ideal conditions the sludge in the digester has a tendency to develop foam. The worst case is if the security valves open and the Foam contaminates the installations on top of the digester. To avoid this situation, often there is a second level measurement installed at the top, in addition to the standard hydrostatic level measurement which is installed at the bottom of the digester. The Micropilot FMR 230 can detect the foam in the digester so that de-foaming steps can be taken in time and biogas production losses can be avoided.

Sludge dewatering

Digested sludge contains about 95% water. Before the sludge can be deposited in a landfill or burned, it must be de-watered in thickeners, belt filter presses, or centrifuges. All thickening processes usually require flocculation agent dosage, which is controlled by a volumetric flow measurement, and a sludge concentration measurement. Exact dosing of polymers is important because a dosage that is too high increases costs for the chemical agent and decreases the efficiency of the dewatering process. In addition to the cost savings for chemicals, the dewatering reduces the sludge volume so that disposition costs are reduced as well.




 Vortex Flowmeters for Flow Rate Measurement

 Ultrasonic Flowmeters for Flow Rate Measurement

Optimizing Water Distribution Networks

In water distribution involving networks, it is primarily pressure and flow measurement which is required. These measurements are necessary for accounting purposes, leakage detection and monitoring the pressure loss in the pipes. In large water distribution networks, further intermediate containers may be required in which depot chlorination is carried out. In this event, end control of the depot chlorination is initiated before the water is returned to the network. The quality control cycle can be repeated with Liquisys M CLM 253 and chlorine sensor CCS 140. A common transmitter concept ensures minimum replacement part storage for all quality relevant online parameters. In order to monitor the network for pressure fluctuations, Endress+Hauser offers a pressure transmitter family with optimized segmentation to meet even the most demanding requirements. The Cerabar pressure transmitter range contains 3 types - the straightforward transducer (Cerabar T) with fixed measuring ranges, Cerabar M with complete communication capabilities and communication options (from 4...20mA to HART or PROFIBUS) and the highly accurate Cerabar S with its modular design, which enables process connections, cell modules and electronics to be exchanged without requiring new calibration. Low, long-term drift (<0.1%/year or 0.25%/5 years) as well as function monitoring from the measurement cell right up to the electronics are further advantages of the Cerabar S in view of safety in the water distribution networks.

Groundwater

The operation of wells requires the measurement of level, pressure and flow. In order to measure the level in wells, rope probes are fitted in stilling well with very small diameters. Endress+Hauser‘s hydrostatic level probe Waterpilot FMX 167 has been specially developed with an external diameter of 22mm. It is perfect for this application and can be directly installed in the stilling well. Reliable measurement is thereby ensured to control water extraction from the well network. Hydrostatic level measurement, combined with flow and pressure measurement, is used to determine the mechanical pump performance. By employing the electrical pump performance as a measuring parameter, the degree of efficiency can be calculated. Endress+Hauser‘s Memo-Graph multi-channel paperless recorder with datalogger is the ideal solution to register the required parameters and perform calculations. The Memo-Graph multi-channel paperless recorder with datalogger is certified tamper-proof and features mathematical functions. Quality control is essential where there is a danger of pollutants entering the source water. Turbidity measurement provides the ideal solution. In the event of rainfall, it is recommended that the well be closed as soon as 0.3 turbidity units are reached. This is done in order to avoid excessive treatment costs due to polluted raw water. Nitrate measurement can also be an important monitoring parameter in the well if agricultural activity is found in the vicinity of the well. Diffusion of nutrients makes inline nitrate measurement an additional safety factor for the well operator.




 Absolute Gauge Pressure Measuremen

 Differential Pressure Measurement

Fresh water treatment for every type of water.

Hardly any water is just like another – that is the reason why the fresh water treatment processes must be tailor-made i.e. designed specifically for every case. Two goals must be kept in mind - treatment of the water, so that it is suitable for human consumption and the removal of anthroprogenic materials. This includes the separation or removal of bacteria, viruses and parasites, also the removal of nitrates, pesticides and herbicides used in insect eradication. A number of proven fresh water treatment processes are available. By using examples of a number of specific and partial processes, we would like to demonstrate technical measurement solutions for fresh water treatment processes with Endress+Hauser technology.

Gas exchange

Gas exchange is a method to remove unwanted gases from water and the oxygen supply. The focus is normally on the removal of aggressive carbon dioxide (deacidification) or other odour or taste adding materials such as hydrogen sulphide. Volume measurement of the incoming water and air is required for control as the relationship of water to air has to be kept constant. To measure the volume of water, electromagnetic flow meters are customarily employed. Promag 50W is a measuring instrument developed especially for the water industry. Next to its high accuracy, typical with Electromagnetic Flow measurement, the instruments in the PROline Promag family are characterised by their safety functions - EPD electrode, tooling concept for measuring point documentation and instrument testing.

External flow measurement using ultrasonic measurement technology is being applied in drinking water treatment. Endress+Hauser is innovative here too. The new Prosonic Flow 90W with improved signal recognition and evaluation allows this measuring method to be used in synthetic, fiberglass reinforced pipes. Advantages of ultrasonic measurement are found in the flexibility of the system as well as the simple installation procedure which does not interrupt the process. In this way, the Prosonic Flow 90W line is also a favorite when used as a measuring instrument which is applied flexibly, e.g. for special inspection and accounting purposes. The potential for reducing operating costs with optimized parts, inventory control and standardization of models is a feature of this analysis technology. A uniform transmitter concept for all relevant quality parameters such as conductivity, oxygen, pH, turbidity and chlorine is not often available. For the user, this represents increased expenditures in operating, training and inventory control. A uniform transmitter concept covering all relevant parameters reduces these costs. Endress+Hauser‘s Liquisys M offers a uniform transmitter concept. Uniform, menu-guided operation, modular system, parameter-specific check functions and the ability to cover all relevant parameters with one uniform transmitter family in working efficiently and cost-effectively.




 Sludge Level Measurement

 Redox Measurement

Flocculation, sedimentation and filtration

Flocculation is used to form separable particles with the addition of flocculation agents. These flocculation compounds are batched according to volume and turbidity and controlled by using discharge control (turbidity) measures. Our proven turbidity sensor CUS 31, in combination with our Liquisys M transmitter, ensures reliable measurement, avoiding interfering influences of adhering gas bubbles. If solids are separated by way of flocculation filtration; the filtration filter must be rinsed regularly by using level measurement and differential pressure measurement. For open filtration filters, Endress+Hauser supplies diverse measuring processes to measure the level – as a rule this is done using non-contact ultrasonic measurement

Prosonic M FMU 40 is a favorite instrument here as the unit is compact, cost-effective and measures reliably due to its leading edge signal evaluation and envelope curve function. The free ToF Tool package also offers to the user optimised software support in layout, adjustment and documentation of the measuring points. Additionally, Endress+Hauser offers the pressure and differential pressure transmitter family for level measurement and pressure measurement to monitor the filter. User-friendly Prosonic M FMU 40/41 can be adjusted on site at the instrument while facilitating cost-effective integration in every control system (HART, PA, FF).

The back rinsing process is an important step as far as availability and safety of the solids separation process is concerned. Of decisive importance is not only the flushing time, but more importantly the speed with which air and water are pressed through the filters. Next to the Promag 50W for water volume measurement, Endress+Hauser supplies a range of devices to measure air volumes. In addition to traditional and proven orifice plate measurement, vortex counters and thermal mass meters are also available.

Water Storage

Water containers must meet diverse requirements in order to ensure reliable protection of the drinking water and avoid changes in the water characteristics as far as bacteria, chemical, physical and biological composition are concerned. Using a suitable remote system, an excellent monitoring function is activated when the central control panel detects pronounced changes in water level, pressure, flow rate and quality characteristics. Electromagnetic flow rate meters and conventional water counters are used for the measurement of flow rate in custody transfer applications. Endress+Hauser offers two solutions: the custody transfer certified Promag 50W which is prepared for this task at works. Custody transfer verification can be adapted at a later date. As an alternative, E+H offers to organize the certification with the calibration centre for you. You then receive the custody transfer certified and sealed instrument.




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