A Study on Acclimation and Culture of Salt Tolerant Sludge

2014 ◽  
Vol 955-959 ◽  
pp. 1895-1898
Author(s):  
Su Chen ◽  
Lei Chao ◽  
Ning Chen ◽  
Lin Shan Wang ◽  
Xue Shao ◽  
...  
Keyword(s):  
Sewage Treatment ◽  
Treatment Plant ◽  
Experimental System ◽  
Biological Indicator ◽  
Stable Operation ◽  
Aeration Tank ◽  
Salt Tolerant ◽  
Removal Rates ◽  
Salinity Acclimation ◽  
Urban Sewage

The inoculated sludge in this experimental system is from the end of aeration tank of the wastewater treatment plant. Under stable operation, the system’s treatments of COD and NH4+-N are all in line with Level One Urban Sewage Discharge stipulated by Pollutant Discharge Standards for Urban Sewage Treatment Plants (GB 18918-2002). The removal rates of COD and NH4+-N are 94.27% and 91.03%. By gradually improving the method of salinity acclimation, the salt tolerant sludge with outstanding performance can be successfully acclimated, and each gradual increase in salinity scope is controlled at around 4 g/L. When the salinity is 1%, the removal rates of COD and NH4+-N reach to 92.09% and 70.13%. The salinity has significant impacts on microbial activity. With the increase in salinity, the dehydrogenase activity gradually decreases. Salinity has significant effects on protozoa. Paramecia and nematodes can be taken as the biological indicator of outflow water quality of brine waste.

Feasibility Study on the Concentration of Miscible Liquid in Aeration Tank Used by CAF Process

2012 ◽  
Vol 260-261 ◽  
pp. 754-758
Author(s):  
Xiao Tao Guan ◽  
Feng Ping Hu ◽  
Lin Yuan Wang
Keyword(s):  
Activated Sludge ◽  
Industrial Wastewater ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Aeration Tank ◽  
Low Density ◽  
Sludge Treatment ◽  
Sewage Treatment Plants ◽  
Urban Sewage

The Cavitation Air Flotation (CAF) process has been widely applied to the pretreatment of industrial wastewater and urban sewage. However, it has not been applied in the sludge treatment yet. In this paper, Nanchang Chaoyangzhou Sewage Treatment Plant is taken as the example that the CAF process is introduced to the concentration of miscible liquid in the aeration tank in urban sewage treatment plants. According to the optimization of the sludge conditioning agent and the study on the concentration of the miscible liquid in the aeration tank, it is concluded that CAF can be used to concentrate the leftover activated sludge in urban sewage treatment plant, especially that with low density.

Experimental Study on the Landscape Combined Sewage Treatment Technology

2013 ◽  
Vol 864-867 ◽  
pp. 2654-2658
Author(s):  
Li Song ◽  
Gui Fang Jiang ◽  
Zhi Gang Xie ◽  
Qing Li ◽  
Wu Quan Ding
Keyword(s):  
Low Cost ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Surface Water Quality ◽  
Quality Standard ◽  
Stable Operation ◽  
Treatment Technology ◽  
Wastewater Treatment Process ◽  
Urban Sewage

In this paper, artificial wetland systems, aeration tanks, rapid filter combined biological wastewater treatment process facilities for domestic sewage treatment. Test systems,TN treatment effect, are higher than the value of surface water quality standard GB3838-2002 in V class standards.Treatment effect to achieve the urban sewage treatment plant pollutant discharge standards GB18918-2002 a class of emission standards, the treatment system, low cost, easy management, stable operation.

Life Cycle Assessment of Urban Wastewater Treatment

2014 ◽  
Vol 535 ◽  
pp. 346-349
Author(s):  
Mei Wang ◽  
Ming Yang ◽  
Jun Liu ◽  
Jian Fen Li
Keyword(s):  
Wastewater Treatment ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Wastewater Treatment Plant ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Urban Wastewater ◽  
Urban Sewage ◽  
Urban Wastewater Treatment ◽  
Whole Life Cycle

Effect and benefits of a product or service could be analyzed and evaluated by life cycle assessment during the whole life cycle. Urban sewage treatment plants could improve and control urban water pollution escalating, but it also had certain harm to environment. Effect and benefits of urban wastewater treatment plant A and B were analyzed and evaluated, 13 factors were selected, and comprehensive benefits were researched quantificationally using the method of analytic hierarchy process. It found that urban wastewater treatment plant A who applied A/O process had better benefits than urban wastewater treatment plant B who applied BIOLAK process.

Estrogenic compounds in Tunisian urban sewage treatment plant: occurrence, removal and ecotoxicological impact of sewage discharge and sludge disposal

Ecotoxicology ◽  
2016 ◽  
Vol 25 (10) ◽  
pp. 1849-1857 ◽  
Author(s):  
Dalel Belhaj ◽  
Khaled Athmouni ◽  
Bouthaina Jerbi ◽  
Monem Kallel ◽  
Habib Ayadi ◽  
...  
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Estrogenic Compounds ◽  
Sewage Discharge ◽  
Urban Sewage ◽  
Sludge Disposal

scholarly journals Shifts in the Microbial Community of Activated Sludge with Different COD/N Ratios or Dissolved Oxygen Levels in Tibet, China

2019 ◽  
Vol 11 (8) ◽  
pp. 2284 ◽  
Author(s):  
Jin Xu ◽  
Peifang Wang ◽  
Yi Li ◽  
Lihua Niu ◽  
Zhen Xing
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Operational Taxonomic Unit ◽  
Carbon To Nitrogen Ratio ◽  
Urban Sewage ◽  
Treatment Performance ◽  
Nitrogen Ratio

In this study, we examined the influence of the organic carbon-to-nitrogen ratio (chemical oxygen demand (COD/N)) and dissolved oxygen (DO) levels on the removal efficiency of pollutants and on the change in total microflora in the cyclic activated sludge system (CASS) in the Nyingchi prefecture in Tibet. The results demonstrated that the treatment performance was the best when the COD/N ratio was 7:1 or the DO levels were 2–2.5 mg/L in comparison with four different tested COD/N ratios (4:1, 5:1, 7:1, and 10:1) and DO concentrations (0.5–1, 1–2, 2–2.5, and 2.5–3.5 mg/L). The treatment performance can be explained by the relative operational taxonomic unit richness and evenness of the microbial communities in activated sludge. Evident microbial variance was observed, especially different COD/N ratios and DO concentrations, which were conducive to the disposal of urban sewage in plateaus. The results help to understand sewage treatment under different COD/N ratios or DO concentrations on plateaus. This work provides practical guidance for the operation of any wastewater treatment plant on a plateau.

The Automatic Control System Based on PROFIBUS for the City Sewage Treatment

2013 ◽  
Vol 385-386 ◽  
pp. 857-861
Author(s):  
Xiao Ping Huang ◽  
Qi Xing Qing
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Fuzzy Controller ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Difficult Problem ◽  
Urban Sewage ◽  
Treated Sewage

On the basis of the computerized technological process control of sewage treatment in a urban sewage treatment plant in the Zone of Nanning, the author had brought forward a plan of PROFIBUS that based on automatic control system for sewage treatment, and designed the automatic control system diagram and the PROFIBUS network diagram for sewage treatment plant. At the same time, the author also made a study of techniques to control the sewage aeration, which was the most difficult problem in sewage treatment process. The fuzzy controller could indicate the changes of the water quality in treated sewage, effectively controlled the volume of aeration and then cut down the operation costs,it had produced good economic and social benefits.

Experimental Studies of CS Type UV Sterilizer for the Urban Sewage Treatment

2013 ◽  
Vol 361-363 ◽  
pp. 601-605
Author(s):  
Ji Ku Zhang ◽  
Yang Yang Li ◽  
Chen Zhang ◽  
Yan Bin Yang
Keyword(s):  
Removal Rate ◽  
Sewage Treatment ◽  
Experimental Studies ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Uv Disinfection ◽  
Secondary Effluent ◽  
Urban Sewage ◽  
High Doses ◽  
Uv Dose

By treating the secondary effluent of Sanbaotun sewage treatment plant in Fushun with the CS type UV Sterilizer, the experiment researches the influence on the removal rate which includes the factors of turbidity, chromaticity, initial E.coli concentration of raw water, UV dose. The results show that the turbidity does not influence on UV disinfection efficiency with the turbidity from 1.5NTU to 3.8NTU. In the low-dose UV disinfection process, the influent sewage turbidity should under 4NTU to ensure the disinfection efficiency. Low chromaticity does not affect the UV disinfection efficiency, with the influent sewage chromaticity is under 15 degrees.The initial E. coli has a certain impact on little doses of UV disinfection with the concentration from 175 × 104 A/ L to 230 × 104 A/ L, no impact on high doses of UV disinfection。

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