Treatment of the Domestic Sewage by the Lab-Scale Sub-Surface Horizontal-Flow Wetland

2011 ◽  
Vol 374-377 ◽  
pp. 1036-1039 ◽  
Author(s):  
Meng Lin ◽  
Yun Han
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Municipal Wastewater ◽  
Primary Standard ◽  
Treatment Plant ◽  
Shaanxi Province ◽  
Horizontal Flow ◽  
Municipal Wastewater Treatment ◽  
Isotherm Equation

Abstract：The constructed wetland is a new kind of wastewater treatment developing in recent years, which is very suitable for the regional characteristics of Shaanxi province. The design of the constructed wetlands is developed from the traditional sub-surface horizontal-flow wetlands (SSHFW). Two groups of wetlands were designed in parallel, and each single wetland can also became the vertical-flow wetland system. Aerating in front of the constructed wetlands is to study the removal efficiency of the organics. Test indicators contain SS、COD、Nitrogen、Phosphor and the rate of nitrification and de-nitrification. According to the experiments of the self-designed SSHFW, the removal efficiency of the SS, COD, NH4+-N、TN and TP were 92%, 82%, 40%, 46.2% and 70% respectively. The strength of nitrification and de-nitrification of the packing reached to 0.35mg/(kg.h) and 3.32mg/(kg.h). On the basis of the Langmuir adsorption isotherm equation, the adsorption quantity of coarse sand and gravel were 405.2mg/kg and 498.6mg/kg. The quality of the effluent met the primary standard of B-standard in the discharge standards of pollutants for municipal wastewater treatment plant (GB18918-2002).

scholarly journals Application of SAC254 measurement for the assessment of micropollutant removal in the adsorptive treatment stage of a municipal wastewater treatment plant

2016 ◽  
Vol 11 (2) ◽  
pp. 503-515 ◽  
Author(s):  
Annette Rößler ◽  
Steffen Metzger
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Municipal Wastewater Treatment ◽  
Adsorptive Treatment ◽  
Micropollutant Removal ◽  
Treatment Stage

In 2010, the Mannheim wastewater treatment plant was expanded with an adsorptive treatment stage to remove organic micropollutants (OMPs). Differences in the removal efficiencies of the OMPs investigated were determined over four years of operation by applying different powdered activated carbon (PAC) products and a constant volume-proportional dosing of 10 mg PAC/L. Possible influences on the removal efficiency are discussed here on the basis of the data obtained, exemplified for the analgesic diclofenac. The analyses show that the removal efficiency is influenced significantly by the spectral absorption coefficient (SAC) of the biologically treated wastewater at a wavelength of 254 nm (SAC254). Therefore, in order to ensure the constant treatment performance desired, the dosage of PAC should be adjusted to the measured SAC254 values. Moreover, as the SAC254 reduction correlates with the removal efficiency of OMPs, the additional determination of its reduction allows indirect control of the actual removal performance achieved. The SAC254 reduction can also be used for targeted control of the PAC dosage.

Engineering Study on the Nutrient Removal Process of ECOSUNIDE

2011 ◽  
Vol 393-395 ◽  
pp. 1198-1202
Author(s):  
Yan Li ◽  
Na Meng
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Nutrient Removal ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Operating Cost ◽  
Treatment Plant ◽  
Simultaneous Nitrification And Denitrification ◽  
Municipal Wastewater Treatment ◽  
Engineering Study

ECOSUNIDE (ecological superior nitrification denitrification), based on the advanced theories including uniform dynamic, dynamic loading, sludge concentraion optimization, simultaneous nitrification and denitrification, etc., is characterized by high removal efficiency of COD, BOD, nutrient, short total detention period, low operating cost, etc. This process has been successfully applied in the Further Treatment Engineering in Luozhuang of Linyi. The effluent qualities meet the ClassⅠ-A Criteria Specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).

Application of Baffled-Submerged Bio-Film Process in the Treatment of Sewage Wastewater in a Small Town

2011 ◽  
Vol 356-360 ◽  
pp. 1401-1405
Author(s):  
Ya Feng Li ◽  
Xiao Ning Zhang ◽  
Xin Wang
Keyword(s):  
Wastewater Treatment ◽  
Process Parameters ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Primary Standard ◽  
Treatment Plant ◽  
Small Towns ◽  
Municipal Wastewater Treatment ◽  
Flow Process ◽  
Broad Application

The process parameters and running effect of baffled-submerged bio-film process applied in the treatment of sewage wastewater were introduced, aiming to improve the broad application of baffled-submerged bio-film process in the wastewater treatment in small towns. An engineering case was taken as an example to describe the process flow, process parameters and sizes of the structures. The character of the designing was explained along with the discussion of the running effect. The running effect shows that sewage wastewater treated by baffled-submerged bio-film process can meet the requirements of Grand B of Primary standard of Discharge standard of pollutants for municipal wastewater treatment plant (GB18918).

Enhanced denitrification with methanol at WWTP Zürich-Werdhölzli

1996 ◽  
Vol 33 (12) ◽  
pp. 117-126 ◽  
Author(s):  
I. Purtschert ◽  
H. Siegrist ◽  
W. Gujer
Keyword(s):  
Wastewater Treatment ◽  
Carbon Source ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Yield Coefficient ◽  
Adaptation Period ◽  
Municipal Wastewater Treatment

In coordination with the EU-guidelines the large wastewater treatment plants in Switzerland have to be extended with enhanced nitrogen removal. Due to the existing plant configuration, the low COD/N ratio and dilute wastewater, denitrification supported by an external carbon source instead of extending the plant may be an interesting and cost effective solution for municipal wastewater treatment. At the wastewater treatment plant Zürich-Werdhölzli different experiments were performed with methanol addition to predenitrification from March to July 1994. The aim of this work was to evaluate the use of methanol as an alternative to plant extension to achieve a higher nitrogen removal efficiency. Therefore, two parallel denitrifying lanes were investigated, one served for methanol addition experiments and the other as a control. The effect of oxygen input into the anoxic zone due to influent, return sludge and mixing was investigated, too. The results show that nitrogen removal efficiency can be substantially increased as compared to the reference lane. The adaptation period for methanol degradation was only a few days and the process was relatively stable. Based on total nitrogen in the inflow, the average denitrification was 55% with methanol addition and 35% without methanol. The yield coefficient YCOD was 0.4 g CODX g−1 CODMe. Due to the small net growth rate of the methanol degraders the denitrification capacity is relatively low and nitrate peak loads cannot be fully denitrified. Hence, methanol as a carbon source requires more or less constant dosing. To prevent nitrate limitation, methanol addition should be controlled by the anoxic nitrate concentrations.

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