Proceedings

Tertiary N and P removal with optimised continuous sand filters, an overview of long-term full-scale plant results

Al-Massri, F.1 and Wouters, H.2, BW Products, 2Brightworks BV, The Netherlands

(free)

Increasing environmental awareness require further removal of nitrogen N and Phosphorus P from effluent WWTP. As a result, the placement of tertiary & quaternary water treatment techniques at WWTPs has become important.

Practical experiences and performance data of test and full-scale plants, based upon continuous (bio) filtration, designed for P removal down to 0.15 mg/l are reported. Also, operational experiences regarding process stability, optimization and adaptability to shock loadings are indicated. Long term results are shared for sand filters removing combinations of TSS, BOD, N and P. The recent results of the start-up of a nitrifying continuous filter plant in the UK, currently taking place, will be presented.

The results of the “Most Innovative New Technology of the Year 2017“, the award-winning Sand-Cycle technology, optimizing and enhancing the use of continuous sand filters will be presented. The technology is based upon “Radio-frequency identification” tags moving with the sand grains in the filter bed and revealing the performance of the filter. The technology has been implemented successfully in Europe and is now used for both monitoring and control of the filters. Also, plant operator’s effort to keep the filters running in the best possible way is reduced.

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