scholarly journals Potential of a combined nitritation/anammox process using fixed-bed reactors for nitrogen removal from reject water in a municipal wastewater treatment plant

2012 ◽  
Vol 48 (1) ◽  
pp. 1-11 ◽  
Author(s):  
KEITA TAKAKI ◽  
MASAHIKO OKUDA ◽  
HIROKI ITOKAWA ◽  
HITOSHI NAKAZAWA ◽  
KENJI FURUKAWA
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Fixed Bed ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Reject Water ◽  
Fixed Bed Reactors ◽  
Anammox Process

scholarly journals Two strategies for phosphorus removal from reject water of municipal wastewater treatment plant using alum sludge

2009 ◽  
Vol 60 (12) ◽  
pp. 3181-3188 ◽  
Author(s):  
Y. Yang ◽  
Y. Q. Zhao ◽  
A. O. Babatunde ◽  
P. Kearney
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Organic Polymer ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plant ◽  
Reject Water ◽  
Alum Sludge

In view of the well recognized need of reject water treatment in MWWTP (municipal wastewater treatment plant), this paper outlines two strategies for P removal from reject water using alum sludge, which is produced as by-product in drinking water treatment plant when aluminium sulphate is used for flocculating raw waters. One strategy is the use of the alum sludge in liquid form for co-conditioning and dewatering with the anaerobically digested activated sludge in MWWTP. The other strategy involves the use of the dewatered alum sludge cakes in a fixed bed for P immobilization from the reject water that refers to the mixture of the supernatant of the sludge thickening process and the supernatant of the anaerobically digested sludge. Experimental trials have demonstrated that the alum sludge can efficiently reduce P level in reject water. The co-conditioning strategy could reduce P from 597–675 mg P/L to 0.14–3.20 mg P/L in the supernatant of the sewage sludge while the organic polymer dosage for the conditioning of the mixed sludges would also be significantly reduced. The second strategy of reject water filtration with alum sludge bed has shown a good performance of P reduction. The alum sludge has P-adsorption capacity of 31 mg-P/g-sludge, which was tested under filtration velocity of 1.0 m/h. The two strategies highlight the beneficial utilization of alum sludge in wastewater treatment process in MWWTP, thus converting the alum sludge as a useful material, rather than a waste for landfill.

Influence of primary sedimentation on pre-denitrification system performances

2001 ◽  
Vol 44 (1) ◽  
pp. 113-120 ◽  
Author(s):  
G. Esposito ◽  
C. Bastianutti ◽  
G. Bortone ◽  
F. Pirozzi ◽  
S. Sgroi
Keyword(s):  
Sensitivity Analysis ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Total N ◽  
Removal Efficiencies

The effects of suppressing primary sedimentation on nitrogen removal efficiency of a pre-denitrification system have been evaluated for a large municipal wastewater treatment plant. Simulations have been carried out using the STOAT model. For both the process schemes with and without primary sedimentation, nitrification efficiencies are calculated for increasing influent loads of COD, total N and suspended solids. The sensitivity analysis shows that for the usual carbon to nitrogen ratios in the raw influent both the process schemes allow the requested removal efficiencies, whereas for significantly high C/N ratios the scheme with primary sedimentation is preferable.

scholarly journals Model-Based Solution for Upgrading Nitrogen Removal for a Full-Scale Municipal Wastewater Treatment Plant with CASS Process

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 527
Author(s):  
Mengmeng Liu ◽  
Meixue Chen ◽  
Rong Qi ◽  
Dawei Yu ◽  
Min Yang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Cfd Simulation ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Municipal Wastewater Treatment

Aiming at providing cost-effective approach for upgrading the existing municipal wastewater treatment plants in the cold region of China to meet more stringent discharge standards of nitrogen removal, a full-scale sewage treatment plant with the CASS process was selected through focusing on biological process, key equipment and hydrodynamics in bioreactors by the activated sludge model 1 (ASM1) and computational fluid dynamics (CFD) model. Influent COD fractions and the key characteristic parameters (YH and bH) of the activated sludge were determined through the respirometry at temperatures of 10 °C and 20 °C, respectively. The layout of submerged agitator installation in the bioreactor of the CASS process was optimized through CFD simulation. The calculation of the average relative deviation (less than 20%) between simulated data and the operation data, demonstrated that the ASM1 model could be reasonably used in the wastewater treatment plant simulation. The upgrade solution based on modelling of ASM1 and CFD was successfully applied in practice, which not only made the effluent COD, NH4+-N and TN concentrations meet with the discharge standard of Grade I-A, but also reduced the energy consumption by 25% and 16.67% in summer and winter, respectively. After upgrading, microbial diversity increased in both summer and winter, with an especially significant increase of the relative abundance of denitrifying bacteria.

Sign in / Sign up

Export Citation Format

Share Document