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Wastewater
There are different types of wastewater, such as municipal sewage or industrial effluent, and these different waste waters all have their own types of microbiological environment, microbiological counts, levels of suspended solids, UV transmission rates and temperatures. Depending on whether the effluent is to be discharged into rivers, lakes and seas or re-used for applications such as irrigation, the required microbiological counts are usually specified by local regulations.
Aquionics was the first supplier in the world of closed pipe UV systems for wastewater treatment. The company also invented the InLine® concept, with all InLine UV disinfection systems having the highest kill rate efficiency compared with power consumption. Aquionics also developed the MultiWave® medium pressure lamp, which has a very high power consumption efficiency and which ensures no microbial no photo repair of UV-damaged DNA.
All InLine UV systems are equipped with MultiWave® lamps and have an optimized chamber design using CFD (Computational Fluid Dynamics) with low head loss. They are all very compact with a small footprint, making them easy to retrofit. Electronic ballasts (stepless power supplies) enable the units to compensate for any unforeseen lower transmissions or increase in flow rates and use up to 20% less power than other energy control methods. Automatic wipers keep the lamps clear of fouling and the advanced UVtronic control module provides data logging and is fully programmable. Finally, the design of the chambers forces the wastewater to pass perpendicularly to the UV lamps, meaning there are no 'blind spots'.
The temperature of wastewater has a significant influence on the choice of UV lamp. Medium pressure UV lamps, like the MultiWave range, are not influenced by water temperature, while low pressure UV lamps have an optimum operating temperature of around 20°C, with a change in water temperature of only 5°C significantly influencing the lamp's performance. Medium pressure lamps should therefore always be used if large temperature fluctuations are expected.
