Chemical Technology July 2016

effectively. Biological wastewater treat- ment is a core process in any modern sewage processing plant. It involves the decomposition of organic loads and nutrients that can cause eutrophication in downstream water bodies. Aeration of the aerobic treatment step is, however, a major cost factor, with at least 50 % of electrical energy being consumed here alone. It has already been proved by many operators that a strategically implemented aeration control system can significantly improve both effluent discharge va lues as well as energy consumption. Inmany places phosphate precipitation is also necessary, but this also represents a significant cost factor. Load-sensitive phosphate precipitation is an effective solution for cost-efficiency and safe phos- phate discharge levels. Liquiline Control CDC81 The Endress+Hauser load-sensitive con- troller, Liquiline Control CDC81, using ammonia and nitrate levels in the process, aims to achieve safe effluent levels as first priority and also to reduce energy consumption significantly. The controller can be rapidly commissioned and supplies identical HMIs for up to three biological treatment zones. It provides real time control, fieldbus communication, failure- safe modes according to process impact, data logging, event and alarmmessaging. The Liquiline Control CDC81 is able to control and optimise continuous aeration, intermittent aeration as well as precipitant dosing for phosphate removal, Further support services A 24/7 service helpline is there to support you and give you required assistance in order to minimise your downtime. This can be telephonic assistance or on-site diagnostics or repair. Engineering, com- missioning, traceable calibrations, main- tenance and expert product training are also available . Only a clear picture and detailed knowl- edge of the installed instrument base can act as a solid foundation for a predictive maintenance and optimising strategy for your plant. Whether you need to find information concerning spare parts, verify software versions, trace instrument his- tory records on the basis of key events or view the plant database with its installed instruments – the data must be up-to-date and rapidly available.

In conjunction with the intuitive Field Data Manager software (FDM), remote access and further processing becomes very easy to imple ment. Energy monitoring offers: • optimised plant performance  • increased pump efficiency • monitoring electricity generation (where biogas is used) • improved aeration performance • customised KPIs. All parameters in view Endress+Hauser offers an elegant way to combine online analytics and sampling in a single sys- tem. The basis for this innovation is the Liquiline CM44x multichannel transmitter, which not only supplies the analytical sen- sors, is also the core electronic component of the CSF48 sampler series. A single Liquiline transmitter can control sampling programs as well as up to four additional online parameters simultaneously. The Liquistation CSF48 sampler can be easily converted into a smart, reliable measuring station by linking up to four freely selectable analysis parameters. Safe and cost-effective aeration control Using online analysis can improve per- formance. The combination of oxygen, ammoniumand nitratemeasurement with load-dependent aeration control can help operators to improve plant performance through reducing emissions and improving safety and energy efficiency. Reliable removal of COD and nutrient load is essential. This makes efficient plant operation necessary in order to allow oxygen input and non-aerated periods to finalize the nitrogen removal through de- nitrification. Monitoring the exact amount of the aeration’s energy consumption is critical to managing overall energy costs