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

Municipalsludge is refers to the product of sewage treatment plant, facing the huge number of municipalsludge, the disposal of the municipalsludge has aroused wide attention of all countries. Many studies consider that urban land use of the municipalsludge is the most effective method, However heavy metal accumulats in the sludge and the environment of the risk with agricultural appears day after day.The purpose of this study is: analysis the transfermation of heavy metals in the activated sludge system of various structures. put forward the solution of reducing heavy metal exceeded in the activated sludge treatment process.It appears that the coagulation can make colloid stabilized and sedimentation, can control the input of the heavy metal effectively; Adsorption of activated sludge to heavy metal is very fast, in 30 min basic reached adsorption balance, probably 80% or more;The change from oxygen to aerobic have great influence on Heavy metal biological adsorption;An aerobic digestion processes can reduce the volume and quality of sludge, but there is no enrichment role to heavy metal in sludge.

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Arcobacter cryaerophilusand thermophilic campylobacters in a sewage treatment plant in Italy: two secondary treatments compared

Epidemiology and Infection ◽

10.1017/s0950268800051050 ◽

1993 ◽

Vol 110 (3) ◽

pp. 633-639 ◽

Cited By ~ 42

Author(s):

S Stampi ◽

O Varoli ◽

F Zanetti ◽

G De Luca

Keyword(s):

Activated Sludge ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Most Probable Number ◽

Tertiary Treatment ◽

Probable Number ◽

Urban Sewage ◽

Thermophilic Campylobacter ◽

The Mean

SUMMARYMicroaerophilic organisms were monitored in sewage effluent undergoing two secondary treatments: air and oxygen-activated sludge. The mean numbers ofArcobacter cryaerophilusand thermophilic campylobacters detected in incoming sewage were 5639/100 ml and 1720/100 ml respectively.Secondary treatment in air tanks reduced the population ofA. cryaerophilusby 97.1% and of thermophilic campylobacters by 99.08%, whereas treatment in oxygen tanks reduced the bacteria 97.8% and 99.63% respectively, showing that oxygen-activated sludge treatment was more effective. Subsequent tertiary treatment with 2 p.p.m. chlorine dioxide evidenced the removal ofA. cryaerophilusto 99.9% and eliminated thermophilic campylobacters.Campylobacter jejuniandC. coliconstituted 54.1% and 45.9% of 74 thermophilic campylobacter strains isolated. In air-activated sludge effluentC. jejuniwas found more often, thus appearing more sensitive to oxygen.The most probable number assay used for detection of campylobacters, blood medium for enrichment and blood-free medium for plating, also appeared to be fit forA. cryaerophilus, the high density of which in urban sewage may be due to inflows from slaughterhouses.

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A Study on Application of the Technology for Activated Sludge Reducing

Smart Construction Research ◽

10.18063/scr.v1.272 ◽

2017 ◽

Vol 1 ◽

pp. 1

Author(s):

Zhan Yang

Keyword(s):

Activated Sludge ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Activated Sludge Process ◽

Sludge Treatment ◽

Microbial Decomposition ◽

Physical Chemical

Activated sludge process is the most widely used technology in sewage bioremediation up to now. However, there is also a serious problem with this technology, that is, a great amount of sludge will be left over. In view of this situation, a study has been carried out through the domestic activated technology for sludge treatment and also research on the effective sludge treatment. They made use of the microbial decomposition to decompose the oxide by using the means of physical, chemical, biological, etc. to minimize the effluent from the sewage treatment plant and thus, reduced the amount of sludge produced.

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A Study on Application of the Technology for Activated Sludge Reducing

Smart Construction Research ◽

10.18063/scr.v1i1.272 ◽

2017 ◽

Vol 1 (1) ◽

pp. 1

Author(s):

Zhan Yang

Keyword(s):

Activated Sludge ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Activated Sludge Process ◽

Sludge Treatment ◽

Microbial Decomposition ◽

Physical Chemical

Activated sludge process is the most widely used technology in sewage bioremediation up to now. However, there is also a serious problem with this technology, that is, a great amount of sludge will be left over. In view of this situation, a study has been carried out through the domestic activated technology for sludge treatment and also research on the effective sludge treatment. They made use of the microbial decomposition to decompose the oxide by using the means of physical, chemical, biological, etc. to minimize the effluent from the sewage treatment plant and thus, reduced the amount of sludge produced.

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Lysis of filamentous bacteria by surfactants

Water Science & Technology ◽

10.2166/wst.1996.0546 ◽

1996 ◽

Vol 34 (5-6) ◽

pp. 145-153 ◽

Cited By ~ 1

Author(s):

Katsura Kitatsuji ◽

Hiroshi Miyata ◽

Tetsuro Fukase

Keyword(s):

Activated Sludge ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

High Rate ◽

Synthetic Surfactant ◽

Aeration Tank ◽

Filamentous Bacteria ◽

Toc Removal ◽

Synthetic Surfactants

A microbial substance that lyses filamentous bacteria was obtained. The substance also exhibited some properties of a bio-surfactant. Lysing of filamentous bacteria with synthetic surfactants was also examined. Several synthetic surfactants were found to be capable of lysing filamentous bacteria. Nonionic synthetic surfactants with an HLB of 11-15 were found to lyse type 1701 and type 021N in an activated sludge sampled from a sewage treatment plant. Use of the synthetic surfactant to lyse filamentous bacteria was also demonstrated in a continuous-feed aeration tank, and settleability of sludge was improved. The surfactants did not adversely effect floc-forming microorganisms as evidenced by the high rate of TOC removal. The results indicate that synthetic surfactants can be used to prevent filamentous bulking in the activated sludge process.

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Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operation

Oceanological and Hydrobiological Studies ◽

10.2478/v10009-007-0049-7 ◽

2008 ◽

Vol 37 (2) ◽

Author(s):

Maciej Walczak

Keyword(s):

Water Quality ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Sewage Treatment Plants ◽

Plant Operation ◽

Treated Sewage ◽

Microbiological Parameters ◽

Microbial Indices

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operationThis paper reports the results of studies of microbiological changes in the water quality of the Vistula and Brda rivers after the opening of sewage treatment plants in Bydgoszcz. The study involved determining the microbiological parameters of water quality. Based on the results obtained, it was found that the quality of the water in both rivers had improved decidedly after the opening of the plants, although an increased number of individual groups of microorganisms was found at the treated sewage outlet from one of the plants.

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Spatial and Temporal Water Quality Trends in Severn Sound, Georgian Bay, since the Introduction of Phosphorus Control Guidelines: Nutrients and Phytoplankton, 1973 to 1991

Water Quality Research Journal ◽

10.2166/wqrj.1995.044 ◽

1995 ◽

Vol 30 (4) ◽

pp. 565-592 ◽

Cited By ~ 1

Author(s):

A.F. Gemza

Keyword(s):

Total Phosphorus ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Soluble Reactive Phosphorus ◽

Euphotic Zone ◽

Water Clarity ◽

Sewage Treatment Plants ◽

Order Of Magnitude ◽

Phosphorus Levels

Abstract Severn Sound continues to exhibit signs of eutrophication despite initial identification of the problem in 1969 and the construction of several sewage treatment plants since then. In general, improvements in trophic state indicators have been marginal, suggesting that the sewage treatment plants have had limited success in controlling phosphorus concentrations. These discharges likely contributed to the increased total phosphorus levels and consequently the higher phytoplankton densities of the nearshore waters. Phytoplankton biovolumes were on average one order of magnitude higher than in the open waters of Lake Huron with mean summer biovolumes as high as 8.0 mm/L. Algal biovolumes were most dense in Penetang Bay, which experienced limited exchange with the main waters of the sound. No significant long-term trends were observed. Water clarity was declining significantly, however, at a rate of -0.60 to -0.78 m/year throughout the sound except in Sturgeon Bay. Total phosphorus levels were highly variable from year to year; however, concentrations from a 20-year perspective were declining in the open waters at a rate of 0.70 µg/L/year, but response was limited in nearshore areas. In Sturgeon Bay, mean annual euphotic zone total phosphorus as well as soluble reactive phosphorus levels declined by as much as 50% following the construction of a sewage treatment plant with tertiary treatment. Phytoplankton genera typical of eutrophic waters continued to dominate the algal assemblage but members indicative of mesotrophic conditions have become apparent in some areas of the sound.

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