Studies on the Contact Biofilter as a Compact Process in Domestic Sewage Treatment

1986 ◽  
Vol 18 (7-8) ◽  
pp. 185-192
Author(s):  
I. Somiya ◽  
H. Tsuno ◽  
Y. Ono
Keyword(s):  
Retention Time ◽  
Granular Medium ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Secondary Treatment ◽  
Organic Substances ◽  
Treatment Performance ◽  
Short Retention Time

This paper describes the treatment performance of a newly developed compact treatment process, named the “contact biofilter”. It is composed of a submerged biofilter and a granular medium filter. The research experiments on the process were conducted using domestic sewage. It was clearly shown that this process could reduce SS and total BOD in effluent to below 10 and 20 mg/l, respectively, in a short retention time, and it can be used as a secondary treatment process. The organic substances in sewage are effectively recovered as sludge without extensive mineralization.

The nitrogen removal potential of predenitrification systems in sensitive coastal areas

1995 ◽  
Vol 32 (7) ◽  
pp. 135-142
Author(s):  
E. Görgün ◽  
N. Artan ◽  
D. Orhon ◽  
R. Tasli
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Domestic Sewage ◽  
Coastal Areas ◽  
Careful Evaluation ◽  
Denitrification Kinetics

Effective nitrogen removal is now required to protect water quality in sensitive coastal areas. This involves a much more difficult treatment process than for conventional domestic sewage as wastewater quantity and quality exhibits severe fluctuations in touristic zones. Activated sludge is currently the most widely used wastewater treatment and may be upgraded as a predenitrification system for nitrogen removal. Interpretation of nitrification and denitrification kinetics reveal a number of useful correlations between significant parameters such as sludge age, C/N ratio, hydraulic retention time, total influent COD. Nitrogen removal potential of predenitrification may be optimized by careful evaluation of wastewater character and the kinetic correlations.

Occurrence and elimination of antibiotics at four sewage treatment plants in Japan and their effects on bacterial ammonia oxidation

2009 ◽  
Vol 59 (4) ◽  
pp. 779-786 ◽  
Author(s):  
Gopal Chandra Ghosh ◽  
Takashi Okuda ◽  
Naoyuki Yamashita ◽  
Hiroaki Tanaka
Keyword(s):  
Oxygen Uptake ◽  
Nalidixic Acid ◽  
Removal Efficiency ◽  
Treatment Process ◽  
Ammonia Oxidation ◽  
Oxygen Uptake Rate ◽  
Sewage Treatment ◽  
Secondary Treatment ◽  
Mixed Condition ◽  
Sewage Treatment Plants

The occurrence and elimination of seventeen antibiotics (three macrolides: azithromycin, clarithromycin and roxithromycin; five quinolones: ciprofloxacin, enrofloxacin, levofloxacin, nalidixic acid and norfloxacin; five sulfonamides: sulfadimethoxine, sulfadimizine, sulfamerazine, sulfamethoxazole and sulfamonomethoxine; and others: tetracycline, lincomycin, salinomycin and trimethoprim) were investigated at four full-scale sewage treatment plants in Japan. The highest concentration was recorded for clarithromycin (1,129 to 4,820 ng/L) in influent, followed by azithromycin (160 to 1,347 ng/L), levofloxacin (255 to 587 ng/L) and norfloxacin (155 to 486 ng/L). A vary inconsistence picture was obtained with negative to over 90% removal. Nalidixic acid (53 to100%) exhibited higher removal efficiency followed by norfloxacin (75 to 95%), levofloxacin (40 to 90%), ciprofloxacin (60 to 83%) and enrofloxacin (38 to 74%). Among macrolides, clarithromycin (50 to 88%) and azithromycin (34 to 86%) showed relatively higher removal efficiency than roxithromycin (−32 to 59%). For most of the antibiotics removal efficiency was higher in A2O and AO based secondary treatment process than CAS process. The effect of the antibiotics on bacterial ammonia oxidation determined by oxygen uptake rate presented that there was no significant effect below 0.05 mg/L of each antibiotics. Even at the same concentration, antibiotics in mixed condition had higher inhibition effects than individuals.

Influence of Bio-Filter Bed on Treatment of Domestic Sewage in Purifying Tank

2011 ◽  
Vol 183-185 ◽  
pp. 1009-1013
Author(s):  
Chang Wang ◽  
Zhi Cheng Wang ◽  
Bin Fang ◽  
Qing Zhu Jia ◽  
Gui Ju Li
Keyword(s):  
Treatment Process ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Mean Values ◽  
Key Technology ◽  
Effluent Quality ◽  
The Mean ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
Filter Bed

The influence of bio-filter on domestic sewage treatment in purifying tank was studied in this paper. The result shows that when all the three zones were added bio-filter the mean values of effluent COD and NH3-N were 37.8mg/L and 9.64mg/L respectively, which shows that the bio-filter bed is a key technology and plays important roles for solid-liquid separation, bio-sorption and bio-degradation, to raise the effluent quality in the sewage treatment process.

Study on Domestic Sewage Treatment with Rotating Biological Contactor

2012 ◽  
Vol 178-181 ◽  
pp. 376-379
Author(s):  
Fang Li ◽  
Zeng Lu Qi
Keyword(s):  
Removal Efficiency ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Operating Parameters ◽  
Good Prospect ◽  
Rotating Biological Contactor

This paper adopted a 3-stage rotating biological contactor (RBC), while the operating parameters could be controlled properly, this kind of RBC can obtain better removal effect in domestic sewage treatment. At 25oC, when hydraulic retention time (HRT) is 4h ,6h,8h,10h and 12h ,removal rate of COD is 65.14%,86.10%,89.82%,85.93% and 78.58%.HRT fixes on 8h, removal rate of NH3 –N is 75% after adjusting alkalinity. When rotating rate of RBC is 4,6,8,10,12 and 14 r/min, the removal rate of TN is 53.88%,56.78%,60.03%,58.49%,55.32% and 54.87%.RBC also has a good removal efficiency of TP and obtains the removal rate of TP 45%.There is good prospect in domestic sewage treatment with RBC.

Domestic Sewage Treatment Using an Anaerobic Biofilter with an Aerobic Biofilter

1986 ◽  
Vol 18 (7-8) ◽  
pp. 209-216 ◽  
Author(s):  
Y. Inamori ◽  
R. Sudo ◽  
T. Goda
Keyword(s):  
Water Temperature ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Circulation Ratio ◽  
Low Strength ◽  
Bod Removal ◽  
Organic Wastewater

The purpose of this study was to assess the applicability of the anaerobic biofilter process to treat low strength organic wastewater such as domestic sewage. It was found that when the influent BOD was approximately 200 mg/l, water temperature and BOD loading, under a hydraulic retention time (HRT) of 30 hrs, were 20°C and 0.2 kg/m3.day respectively, a BOD removal of at least 70% was attained, and the ratio of sludge produced to BOD removed in the anaerobic biofilter was as low as 0.1. Furthermore it was also found that 75% of nitrogen (N) could be removed in the anaerobic-aerobic biofilter process when the circulation ratio was more than 1:2.

scholarly journals INTEGRATED APPROACH OF PHYCOREMEDIATION IN WASTEWATER TREATMENT: AN INSIGHT

2020 ◽  
Vol 5 (1) ◽  
pp. 8-12
Author(s):  
Nandini Moondra ◽  
Namrata D Jariwala ◽  
Robin A Christian
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Integrated Approach ◽  
Secondary Treatment ◽  
Tertiary Treatment ◽  
Treatment Alternative ◽  
Factors Affecting ◽  
Critical Activity ◽  
Secondary Contamination

Even after secondary treatment, wastewater has a high convergence of nutrients, which frequently causes eutrophication and different destructive impacts on biological systems. Wastewater treatment is a critical activity that must be considered necessary for the improvement of society. The secondary contamination of sludge formation and disposal also makes the treatment difficult. The vitality and financial amount required for tertiary treatment of wastewater remain an issue for local bodies, limiting its use for treatment. Hence, to address most of the challenges of sewage treatment, an algal-based system can be more affordable and biologically secure with the additional advantages of asset recuperation and reusing. Phycoremediation system even eliminates the need for tertiary treatment. The paper illustrates the benefits and challenges of phycoremediation, with some recent studies on microalgae as a wastewater treatment alternative along with the factors affecting the wastewater treatment through microalgae. The in-depth knowledge of the microalgal treatment in every aspect could result in an advancement to the conventional treatment process if applied in the field.

Flocculation, Anaerobic and Microaerobic Treatment Process of Normal Temperature Low Concentration Domestic Sewage

2012 ◽  
Vol 518-523 ◽  
pp. 2530-2534
Author(s):  
Li Jun Nie ◽  
Hua Wen Zhong ◽  
Mei Huang ◽  
Xu Dong Yin
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Anaerobic Treatment ◽  
Domestic Sewage ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Low Concentration ◽  
Cod Removal Rate

Domestic sewage was treated by adopting flocculation, anaerobic and microaerobic combined process under normal temperature. The result demonstrates: total hydraulic retention time is 5.5h (chemical flocculation 1.0h, UASB reactor 2.0h and MUSB reactor 2.5h). UASB reactor can achieve anaerobic sludge granulation under normal temperature and is fairly feasible for low concentration domestic sewage treatment. Compared with single stage UASB reactor, hydraulic retention time of flocculation-UASB combined technique reduces from 4h to 2h. COD removal rate rises from 45% to 50%-60% and suspended COD is mainly removed. DO of microaerobic MUSB technique after anaerobic treatment is 0.2mg/L-0.5mg/L with air and water ratio of 1:1. Effluent quality is stable, in accordance with first standard of Synthetical Draining Standard of Sewage, GB8978—1996.

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