Endress+Hauser Offers Solution for Pollution Measurement in Organized Industrial Zones

Organized Industrial Zones (OIZs) in Turkey have developed alongside industrialization, beginning in major cities with growth potential before spreading nationwide, following patterns seen in other parts of the world. Turkey's first experience with OIZs began in 1962 with the establishment of Bursa OIZ and has continued to expand to the present day. While there were 5 OIZs in 1975, this figure has now risen to over 200 active OIZs. When including OIZs in construction and parcel development phases, the official figure for Turkey stands at approximately 300. Employment in businesses located within OIZs has now reached approximately 850,000 workers. The main reasons businesses prefer organized industrial zones include natural gas supply, electricity distribution and operation of central wastewater treatment facilities provided by OIZs. These services provided by OIZs deliver significant added value for industries. One of the services OIZs provide to industries is wastewater treatment at the OIZ's central wastewater treatment facility, which is an important factor in industrialists' preference for OIZs. In this way, industrialists avoid having to pay separately for the construction and operation of treatment facilities. Of the approximately 200 active OIZs operating in Turkey, roughly 70 possess central wastewater treatment facilities, and this ratio continues to increase. OIZs distribute the operating costs of central wastewater treatment facilities fairly among industrialists according to their pollution loads using the "polluter pays" principle. For fair distribution of wastewater charges to industrialists, wastewater pollution loads must be calculated very accurately. The most important parameter in determining pollution loads in OIZs is organic matter (carbon). With this solution provided by Endress Hauser, wastewater charges determined by OIZs can be calculated in a more reliable manner.

Measurement of Organic Matter

Pollution loads are determined by identifying the amount of organic matter in wastewater. The best-known parameters for determining organic matter are Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC). While COD provides the oxygen equivalent of a compound/substrate, TOC indicates the carbon content of the compound/substrate. The CA72TOC Analyzer measures as TOC and can also provide results as COD using the calculated COD/TOC correlation coefficient. The COD/TOC ratio indicates the compound's composition during the oxidation process of carbon. For outlet wastewater in industrial facilities, the COD/TOC ratio varies widely within a broad range between 1.67 and 6.65. For example, this ratio is 5.4 for methane while it is 2.6 for glucose. For low concentrations, the COD test is simpler and more precise. TOC is preferred at higher wastewater concentrations and provides much more accurate results.

CA72TOC Analyzer Application Areas

• Municipal and industrial wastewater treatment plants, • OIZ central wastewater treatment plants, • Drinking water treatment plants, • Industrial facilities with high wastewater concentrations.

Operating Principle

The CA72TOC is a TOC analyzer developed by Endress+Hauser as a result of joint work with Aliseca and Bayer International Services, operating at high temperature of 850°C. The analyzer's measurement values are not affected by varying pH and high salt concentrations. CA72TOC is suitable for monitoring municipal and industrial wastewater values at the inlet and outlet of wastewater treatment plants. Additionally, it enables determination of carbon load for dosage control. With single and dual-channel models, it can measure the TOC value of two separate tanks with the same measurement range, for example at the inlet of the treatment plant. The CA72TOC device has a measurement range of 0.25-12,000 mg/l. The device uses thermal and catalytic combustion methods in accordance with standards such as EPA method 415.1, DIN EN 1484, and ISO 8245. Wider measurement ranges are available upon request. The device is easily maintained on-site. Thanks to its patented dual sampling system, measurement values are obtained every seven minutes. When the measurement value exceeds the limit, the device's self-monitoring feature is first activated and the device tests itself according to TOC standards. This way any errors in the analyzer are detected and it is determined whether the device has actually exceeded the limit. Berk Güder / Industry Manager / Endress Hauser A.Ş.  

Technical Specifications

• Measurement Range; 0–12,000 mg TOC/l and up to 20-fold sample dilution with maximum TOC measurement concentration of 240,000 mg TOC/l, • Measurement Principle; high-temperature catalytic combustion, • Capability to measure on 2 different channels, • pH-controlled acid dosing, • Easy mounting on wall or stand, • Sample line backwash options, • Salt trap option to prevent device clogging at high salinity, • 4 outputs, • Process Temperature; 0–400C, • Ambient Temperature; 5–350C.