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.

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 Dimension Value

Volume of reactors m³ 3200 (4 x 800)

Volume LEVAPOR m³ 480 (15 %)

Hydraulic ret. time h 3,5 – 3,8

2012 October November December

COD in mg/L 294 295 302

out mg/L 33,7 35,8 37,7

BOD5 out mg/L 11,9 12,9 12,9

TKN in mg/L 28,8 35,3 23,2

NH4N out mg/L 2,0 3,2 3,34 TN (NO)x out mg/L 12,5 14,8 11,0

Susp.solids in mg/L 240 202 247

out mg/L 12,3 11,0 13,6

Water temperature °C 15,6 13,3 9,6

Table 1. Technical data and performance of the WWTP in Oct.- Dec. 2012

Fig. 1 COD – removal in the period of Oct. – Dec. 2012

Fig. 2 Nitrogene removal at decreasing water temperatures in Oct.- Dec. 2012

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-NH4N-values 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 appli-

cation of this technology enables efficient and stable problem solutions at remar-kably 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 Tel.: ++ 49-2173-938715 Germany Mobile: ++ 49-177-786 5533 www.levapor.com E-mail: levapor@web.de