Analyzers, in-situ sensorsand samplers

30

Experts in liquid analysis

Analyzers and samplers in water treatment

Untreated water Water from different sources carries with it different loads. For example, water from springs and wells contains particles; surface water contains additional biologically active elements; and process water from industrial processes contains chemicals. The aim here is to ascertain the quality of the untreated (raw) water: What is measured? • Physical variables such as the pH value, turbidity and conductivity, and the organic load SAC, TOC and derived variables provide information on the usability of the untreated water > CM44, CAS51D, CAS80E, CA72TOC • Nitrate - when converted to nitrite - can cause toxicity and thus has to be measured > CAS51D, CAS80E, CA80NO • Sampling after bank filtration allows for monitoring of the sample quality in the laboratory > CSF28, CSF48, CSP44

Industrial water treatment The water passes through various stages in the treatment process: substances causing turbidity are removed by flocculation and gravel filters; oxygen is added to oxidize iron; and the pH balance is regulated. The resulting water is now the basis for drinking water. It is also used as process water in industry. What is measured? • The physical variables pH, turbidity and conductivity make it possible to regulate the pH balance and oxidation > CM44 • The iron content is measured after the filtration process to gauge the efficiency of the oxidation > CA80FE • The nitrate concentration is measured to check the limit value for drinking water. Nitrite measurement provides information on the presence or absence of hazardous substances > CAS51D, CAS80E, CA80NO • The residual aluminum is measured to determine the flocculant that remains after filtering > CA80AL • Water hardness analysis helps optimize softening processes such as ion exchange or reverse osmosis > CA80HA

TOC, COD, SAC, nitrate

Iron, nitrate, SAC, aluminum, hardness

Contact tank (iron removal)

Filter

Raw water

Activated carbon filter

Source

Well

Flocculation

River

Bank filtrate

Disinfection

Surface water

Air/ oxygen

Rinse water

Measuring points and operating parameters during water treatment from various primary sources