Domestic Wastewater Treatment by Vertical-Flow Filter Grown with Juncus Maritimus in Arid Region

2020 ◽  
Vol 47 ◽  
pp. 109-117
Author(s):  
Khemissi Yahiaoui ◽  
A. Ouakouak ◽  
N. Guerrouf ◽  
A. Zoubeidi ◽  
N. Hamdi
Keyword(s):  
High Efficiency ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Arid Conditions ◽  
Domestic Wastewater Treatment ◽  
Juncus Maritimus ◽  
The Mean ◽  
Nitrogen Elimination

This study aims to experimentally investigate the performance of Juncus maritimus species in removing pollutants from domestic wastewater under arid conditions. The experiment was carried out for three month and several physicochemical and organic parameters were monitored. Results showed a good quality of filtered waters reflecting the high efficiency of vertical-flow filters. The presence of Juncus maritimus species promotes significantly the nitrogen elimination and augments the dissolved oxygen content at the outlet.It was also found that the planted filter provides small improvements in removing BOD5, TSS and TP removal for the three pollutants. The mean removal rate obtained with Juncus maritimus filter was 91.05 % for BOD5, 86.67 % for TSS, 78.45 % for Ntot, and 95.14 % for TP. Microbial activity, uptake by plants, adsorption and physical sedimentation are the main mechanisms of limiting the contaminants rates in the vegetated vertical-flow filter.

scholarly journals Identification and Characterization of Janthinobacterium svalbardensis F19, a Novel Low-C/N-Tolerant Denitrifying Bacterium

2019 ◽  
Vol 9 (9) ◽  
pp. 1937 ◽  
Author(s):  
Yinyan Chen ◽  
Peng Jin ◽  
Zhiwen Cui ◽  
Tao Xu ◽  
Ruojin Zhao ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Removal Rate ◽  
Pcr Amplification ◽  
Domestic Wastewater ◽  
Heterotrophic Nitrification ◽  
Aerobic Denitrification ◽  
Nitrite Accumulation ◽  
Specific Pcr ◽  
Domestic Wastewater Treatment ◽  
Initial Ph

Herein, we isolated Janthinobacterium svalbardensis F19 from sludge sediment. Strain F19 can simultaneously execute heterotrophic nitrification and aerobic denitrification under aerobic conditions. The organism exhibited efficient nitrogen removal at a C/N ratio of 2:1, with an average removal rate of 0.88 mg/L/h, without nitrite accumulation. At a C/N ratio of 2, an initial pH of 10.0, a culturing temperature of 25 °C, and sodium acetate as the carbon source, the removal efficiencies of ammonium, nitrate, nitrite, and hydroxylamine were 96.44%, 92.32%, 97.46%, and 96.69%, respectively. The maximum removal rates for domestic wastewater treatment for ammonia and total nitrogen were 98.22% and 92.49%, respectively. Gene-specific PCR amplification further confirmed the presence of napA, hao, and nirS genes, which may contribute to the heterotrophic nitrification and aerobic denitrification capacity of strain F19. These results indicate that this bacterium has potential for efficient nitrogen removal at low C/N ratios from domestic wastewater.

Simultaneous organic stabilization and nitrogen removal in multi-stage biodrum system

2004 ◽  
Vol 50 (6) ◽  
pp. 95-101
Author(s):  
C. Chiemchaisri ◽  
C. Liamsangoun
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Rotational Speed ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Domestic Wastewater ◽  
Organic Removal ◽  
Multi Stage ◽  
Domestic Wastewater Treatment ◽  
Removal Efficiencies

This paper presents the performance of a multi-stage biodrum system applied to domestic wastewater treatment. The organic stabilization and nitrogen removal efficiency in the system was investigated at different hydraulic retention times (HRT) of 12, 6 and 3 hours. The rotational speed of the biodrum was examined at 2,4 and 8 rpm. Average organic removal efficiencies in the system at different HRTs of 12, 6 and 3 hours were 96.3, 94.4 and 90.9%. Simultaneously, average nitrogen removal efficiencies were 91.5, 90.6 and 81.0%. The effect of rotational speed on nitrogen removal efficiencies in the system was clearly observed at a low HRT of 3 hours. The experimental results suggested that optimum HRT in the system was 6 hours. Moreover, they revealed that nitrogen removal efficiencies in the reactors operated at different rotational speed were in the same degree when considering the effluent nitrogen concentration. However, the reactors operated at lower rotational speed needed to employ higher numbers of biodrums (4 stages) than the others with higher rotational speed (3 and 2 stages at 4 and 8 rpm.) in order to achieve similar effluent qualities. At a rotational speed of 2 rpm, maximum nitrogen removal rate was found to be 0.2 kg/m3/d.

scholarly journals AN EFFICIENT APPROACH TO MANAGE DOMESTIC WASTEWATER IN SMART CITY

2020 ◽  
Vol XLIV-4/W3-2020 ◽  
pp. 391-398
Author(s):  
A. Taouraout ◽  
A. Chahlaoui ◽  
D. Belghyti ◽  
I. Taha ◽  
M. Lachhab
Keyword(s):  
Smart City ◽  
Domestic Wastewater ◽  
Treated Wastewater ◽  
Acceptable Solution ◽  
Organic Matters ◽  
Human Waste ◽  
Ecological Sanitation ◽  
Limit Value ◽  
Domestic Wastewater Treatment

Abstract. The adoption of an ecological sanitation system, meeting the requirements hygienic and sanitary, constitutes a feasible and technically and economically acceptable solution in the future smart city. This new sanitation concept has the advantage of solving the problems of pathogens of human waste at source, thus offering the possibility of reusing them after treatment (recycling) in order to improve the standard of living of the population and protect the environment. The aim of this study is to evaluate the efficiency of a vertical Multi-Soil-Layering system (MSL) system to treat domestic wastewater under three hydraulic loading rates: 250 L/m2/day, 350 L/m2/day and 500 L/m2/day, in Moroccan conditions. To do this, a vertical MSL system measuring 20cm × 60cm × 78cm (L × W × H) was designed to treat domestic wastewater and his performance was investigated. The results showed high removal of organic matters and nutrients under the three hydraulic loads tested; the performance averages recorded are upper than 84 % for organic matters, 83.1 ± 7.2 % for ammonium and 72.4 ± 14.1 % for orthophosphate. The quality of the treated wastewater was evaluated according to Moroccan reject limit value. Consequently, this system could be considered an effective solution to be adopted for decentralized domestic wastewater treatment in Moroccan conditions.

Virus removal by the domestic wastewater treatment system named Johkasou

1997 ◽  
Vol 35 (11-12) ◽  
pp. 187-191 ◽  
Author(s):  
M. Kaneko
Keyword(s):  
Removal Rate ◽  
Treatment Plant ◽  
Order Reduction ◽  
Domestic Wastewater ◽  
Coxsackievirus B3 ◽  
Virus Removal ◽  
E Coli ◽  
Domestic Wastewater Treatment ◽  
Small Model ◽  
Reducing Activity

Virus removal by a treatment plant for domestic wastewater (Johkasou), was investigated using a small model of the plant. Under standard BOD loading of 0.076 BOD kg/m3/day, 97% of E. coli phage T2, 98% of poliovirus 1 and 93% of coxsackievirus B3 were removed from inlet wastewater by the system. About 80% of the viruses in the influent were removed in the first and second anaerobic zones under the standard conditions. When the loading was increased to double the standard loading (0.152 kg BOD/m3/day) the removal rate decreased to 64%. Poliovirus 1 and coxsackievirus B3 were removed more easily than T2 phage. Assuming the stream in each zone was completely mixed, the virus reducing activity of microorganisms was estimated by the rate constant of the first order reduction equation. It was found that the higher the BOD loading rates, the lower the values of the constant.

Performance of a Subsurface Wastewater Infiltration System (SWIS) Using a Novel Biosubstrate

2012 ◽  
Vol 610-613 ◽  
pp. 1770-1773
Author(s):  
Ying Hua Li ◽  
Hai Bo Li ◽  
Xin Wang ◽  
Tie Heng Sun
Keyword(s):  
Wastewater Treatment ◽  
Biological Activity ◽  
Treatment Effect ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Treatment Technology ◽  
High Biological Activity ◽  
Traditional Technology ◽  
Domestic Wastewater Treatment ◽  
Pollutants Removal

Subsurface wastewater infiltration treatment system (SWIS) is a domestic wastewater treatment technology. While the traditional technology has a large floor area, long starting period and low pollutants removal rate. A new biosubstrate that can be applied in SWIS is studied, experiments about its characteristics were performed, and treatment effect was compared. The results show that the biosubstrate has high biological activity, with it, SWIS has shorter starting period, better pollutants removal rate and consequently needs less floor space.

Composting of sewage sludge in a rotating vessel

1995 ◽  
Vol 32 (11) ◽  
pp. 121-125 ◽  
Author(s):  
M. Fürhacker ◽  
R. Haberl
Keyword(s):  
Sewage Sludge ◽  
Wastewater Treatment Plants ◽  
Domestic Wastewater ◽  
Control Programme ◽  
Domestic Wastewater Treatment ◽  
Inorganic Content ◽  
Plant Test ◽  
Agricultural Use ◽  
Intensive Control

Composting of sewage sludge can enhance its quality and suitability for agricultural use. In this work the optimal conditions for composting sewage sludge of small domestic wastewater treatment plants in a rotating vessel with the aim of sanitary safety were investigated. An intensive control programme with regard to viruses, bacteria and parasites was carried out that showed that the hygienic quality was satisfactory. A second aspect was the investigation of a possible reduction of hazardous organic and inorganic pollutants. The amount of inorganic micropollutants was low and did not change based on inorganic content. Based on inorganic residues, losses of 15.7% of the AOX and 25% of the EOX could be found. Relatively high decreasing rates of detergent concentrations could be measured. Only 31.1% of the original load of anionic detergents (measured as MBAS), 38.7% of the cationic and 57.4% of the non-ionic detergents could be detected in the end material. For PAH concentration reduction between 31.5% of fluoranthene and 90.6% benzo(a)pyrene can be reported. All values are based on the inorganic residues. The quality of the resulting compost showed in the plant test a growth rate which qualified the compost to be used to increase soil quality.

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