Ningan wwtp using levapor biofilm technology

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Application of Levapor Carriers for municipal wastewater treatment at NINGAN, China Wastewater treatment plant. Despite very hard winter, nitrification was established within three weeks times which remained stable over a wide range of load fluctuations.

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Ningan wwtp using levapor biofilm technology

  1. 1. LEVAPOR GmbH Biofilm Technologies www.levapor.com NINGAN SEWAGE TREATMENT PLANT LEVAPOR SUPPORTED FLUIDIZED BED TECHNOLOGY Entrance of the NINGAN Sewage Treatment Plant NINGAN is a city with 440.000 inhabitants located ca. 20 km southwest of Mudanjiang in the Heilongjiang province. Due to the cold climate in the area and our positive experiences in the biotreatment of municipal sewage in LEVAPOR supported fluidized bed reactors in Finland, it has been decided to use this technology also in one new municipal plant of Ningan, designed for a capacity of 22.000 m³/day wastewater. Based on our experiences the plant was designed with only 3.200 m³ aerated volume, filled with 480 m³ (15 vol.%) of LEVAPOR carrier cubes of 20x20x7 mm. The plant, constructed by Harbin Baishenglubin Environmental Technology Co.Ltd was started in October 2010 (already winter in Ningan) and reached quite fast its full COD removal capacity, while the start and establishment of nitrification required more time, because the development of slowly growing nitrifying bacteria requires in a new plant a longer period.
  2. 2. Filling the reactor Fluidised LEVAPOR carrier Plant performance The results achieved in the period of October – December 2012 are presented in table 1 and diagrams 1 and 2 . Legend Volume of reactors Volume LEVAPOR Hydraulic ret. time COD in out BOD5 out TKN in NH4N out TN (NO)x out Susp.solids in out Water temperature Dimension m³ m³ h 2012 mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L °C Value 3200 (4 x 800) 480 (15 %) 3,5 – 3,8 October November 294 295 33,7 35,8 11,9 12,9 28,8 35,3 2,0 3,2 12,5 14,8 240 202 12,3 11,0 15,6 13,3 December 302 37,7 12,9 23,2 3,34 11,0 247 13,6 9,6 Table 1. Technical data and performance of the WWTP in Oct.- Dec. 2012
  3. 3. Fig. 1 Fig. 2 COD – removal in the period of Oct. – Dec. 2012 Nitrogene removal at decreasing water temperatures in Oct.- Dec. 2012
  4. 4. Summary 1.Despite decreasing temperatures and remarkably shorter hydraulic retention times in the bioreactors of 3.5 to 3.8 hrs (instead of usual 6 to 10 hours), the plant showed very good results, achieving outlet COD-values of 33 to 38 mg/L (88– 89%) and oulet-NH4Nvalues of 2,0 to 3,3, mg/L (91- 93 %),meeting all legal requirements. 2.Despite remarkable fluctuation of the inlet-COD and –TKN concentrations, performance of both processes remained stable, a remarkable dependence of declining temperatures, typical for nitrification has not yet been registered, confirming earlier experiences. 3.The relatively high removal of TKN confirms also that a remarkable amount of generated nitrate (NO3 ) became denitrified within the porous carrier body, with locally lower oxygen concentrations. 4. The results confirmed all advantages of biofilm technology and show that application of this technology enables efficient and stable problem solutions at remarkably lower capital and operation costs. Presented informations are based on experiences with application LEVAPOR carrier. Testimonies on expected effects can be made in individual case only on basis of investigations of given emissions and in some cases on basis of practice relevant experiments. LEVAPOR GmbH Kölner Str. 38 D- 51379-Leverkusen Germany www.levapor.com Tel.: ++ 49-2173-938715 Mobile: ++ 49-177-786 5533 E-mail: levapor@web.de

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