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LAR delivers analyzers for STC project

LAR delivers measuring technique for the worldwide first semicentralized Supply and Treatment Center (STC) in Qingdao, P.R. China. SEMIZENTRAL is an infrastructure approach for future cities.

Logo SEMIZENTRAL Germany

Copyright: IWAR, Abwassertechnik

LAR delivers measuring technique for the worldwide first semicentralized Supply and Treatment Center (STC) in Qingdao, P.R. China

On the occasion of the „World Horticulture Exposition 2014” (WHE) in Qingdao, China, the Supply and Treatment Center (STC) Qingdao of the project SEMIZENTRAL, was opened April 27, 2014. It is the worldwide first reference plant following the semicentralized, integrated infrastructure approach. The center will serve approximately 12,000 people.

SEMIZENTRAL is an infrastructure approach for future cities. It is an alternative for extensive, centralized systems with long lead times and insufficient scalability. The innovative approach towards semicentralized supply and treatment systems has been developed to serve new-build residential areas in fast-growing metropolitan environments. Each urban district is provided with a flexible integrative infrastructure system for water, wastewater, and waste, adaptable to the respective need.

The SEMIZENTRAL approach combines the traditionally separated sectors of water, wastewater, waste, and energy. Before being treated in the supply and treatment center, wastewater streams (so-called grey water and black water) are collected separately. Sewage sludge is co-treated with organic waste to produce biogas which in turn is used for energy generation.

During the approximately three years of planning and operational attendance of the semicentralized STC Qingdao, 14 partners from Germany, the Tongji University Shanghai and the Qingdao Technological University worked together in a cooperative consortium. The TU Darmstadt maintains a partnership of more than 30 years with its Chinese partners.

The following supporters and sponsors have made important material contributions towards the realization of the SEMIZENTRAL approach. Our sincere thanks go to:

  • Wilo SE (pumps and mixing devices)
  • Aerzner Maschinenfabrik GmbH (blowers)
  • Auma Riester GmbH & Co.KG (gearboxes for valves)
  • OTT System GmbH & Co.KG (aeration elements)
  • Binder GmbH (valves and electronic control devices for aeration)
  • LAR Process Analysers AG (measuring technique)

Text: © IWAR, Abwassertechnik

The total organic carbon (TOC) is one of the most important sum parameters in the assessment of the organic pollution of water. Since it includes all carbon compounds as one mass, it is exactly defined and an absolute quantity. Therefore, it may be determined directly.

Read more about TOC measurement methods.

Total organic carbon analyzers of LAR Process Analysers AG

The chemical oxygen demand (COD) indicates the amount of oxygen which is needed for the oxidation of all organic substances in water and is thus an important indicator for water analysis. It is considered in the planning and controlling of treatment, as well as assessing its efficiency, thus forming the basis for the calculation of waste water charges.

The COD can be determined in laboratory or online, whereby these methods significantly differ in duration and consumables used.

Read more about COD measurement methods.

COD analyzers of LAR Process Analysers AG

The biochemical oxygen demand (BOD) indicates the amount of oxygen which is needed for the biological degradation of organic substances in water.

Since the generally used BOD5 excludes the nitrification part of the process, this parameter is poorly suited for the control of waste water treatment plants. Alternatively, the total BOD is well-suited, due to the determination of the nitrogen as well as the carbonaceous part of biological degradation.

Read more about the online measurement of BOD.

Toxicity is described as the direct harmful effect of a substance on organisms. These effects can already occur at low concentraions of toxic substances and are dependent on the incubation period and the dosage.

Some test methods that are available on the market can detect toxicity by using fish, daphnia, molluscs, algae or luminous bacteria and testing whether a water sample has a toxic effect on the organisms. They do not, however, identify exactly which toxins are present.

Read more about online toxicity measurements.

BOD / toxicity analyzers of LAR Process Analysers AG

The total nitrogen bound (TNb) shows the pollution of water caused by nitrogen compounds. Nitrogen may be present as ammonia, ammonium salts, nitrites, nitrates and organic nitrogen compounds.

In contrast to single measurements of the above-mentioned components, the TNb determination contains all these substances in a single analysis process.

Read more about online TNb measurements.

The total phosphorus (TP) is a sum parameter that shows the organic and inorganic phosphorus compounds in water. Phosphorus is an essential nutrient for humans as well as flora and fauna. However, the substance – depending on its concentration– may cause serious damage.

Read more about online TP measurements.

TN TP analyzer of LAR Process Analysers AG