Behaviour and Modelling of NTA Degradation in Activated Sludge Systems

1989 ◽  
Vol 21 (4-5) ◽  
pp. 315-324 ◽  
Author(s):  
H. Siegrist ◽  
A. Alder ◽  
W. Gujer ◽  
W. Giger
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Water Discharge ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Biological Degradation ◽  
Q 55 ◽  
Q 14 ◽  
The City ◽  
Daily Load

The general model for single-sludge wastewater treatment systems of the IAWPRC task group (Henze et al., 1987) was extended to describe the biological degradation of NTA and adsorption of NTA onto activated sludge based on literature studies and experiments undertaken at the Glatt wastewater treatment plant (waste water discharge: Q = 55 - 60 000 m3/d, 110 000 inhabitants) for the city of Zurich. During two days, the behaviour and diurnal load variation of nitrilotriacetate (NTA), zinc, lead and copper were analyzed on one lane (volume = 1 812 m3, Q = 14 700 m3/d) of the four parallel lanes used in secondary treatment. The plant had a sludge age of about 3.6 days and was partly nitrifying (wastewater temperature = 10-11 °C). The average daily load of NTA for the investigated lane was 14 kg NTA/d, corresponding to 0.5 g NTA/person.d. The influent concentration varied between 300 and 1 500 µg NTA/l. NTA was biologically degraded up to 97 %. Between 12 am and 2 pm of the second day 17 kg NTA (120 % of the daily load of one lane) had been added to the primary effluent. During 4 to 5 hours the biological NTA degradation was saturated and four times more than the daily average of NTA was degraded. Zinc and lead did increase in the secondary effluent during the NTA shock loading.

Polycyclic and Nitro Musks in Canadian Municipal Wastewater: Occurrence and Removal in Wastewater Treatment

2007 ◽  
Vol 42 (3) ◽  
pp. 138-152 ◽  
Author(s):  
Shirley Anne Smyth ◽  
Lori A. Lishman ◽  
Edward A. McBean ◽  
Sonya Kleywegt ◽  
Jian-Jun Yang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Waste Activated Sludge ◽  
Secondary Effluent ◽  
Cold Temperatures ◽  
Primary Sludge ◽  
Polycyclic Musks ◽  
Nitro Musks

Abstract The removal and/or partitioning (to sludge) of six polycyclic and five nitro musks through the liquid treatment train of a conventional Canadian secondary activated sludge wastewater treatment plant is characterized. Raw influent, primary effluent, secondary effluent, primary sludge, and waste activated sludge concentrations were correlated to seasonal process temperatures (warm, 22°C; cold, 15°C). Maximum influent concentrations of polycyclic and nitro musks were 7,030 ± 2,120 ng/L for Galaxolide (HHCB) and 158 ± 89 ng/L for musk ketone respectively. Maximum secondary effluent concentrations were 2,000 ± 686 ng/L for HHCB and 51 ± 14 ng/L for musk ketone. Temperature appeared to influence the degree of removal of musks from wastewater during primary clarification (40% median removal at warm temperatures and 9% at cold temperatures) and overall treatment (82% median removal at warm temperatures and 74% at cold temperatures) but not secondary activated sludge treatment (71% median removal at warm temperatures and 70% at cold temperatures). In primary sludge, polycyclic musks were found at concentrations up to 35,000 ng/g for HHCB, and nitro musks were found at concentrations up to 490 ng/g for musk ketone. In waste activated sludge, polycyclic musks were found at concentrations up to 52,000 ng/g (HHCB), and nitro musks were found at concentrations up to 1,100 ng/g (musk ketone). The hydraulic retention time and the suspended solids of the treatment process appeared to influence the degree of partitioning of musks to sludge.

Dynamics in maximal settling capacity in an activated sludge treatment plant with highly loaded secondary settlers

2004 ◽  
Vol 50 (7) ◽  
pp. 187-194 ◽  
Author(s):  
B.-M. Wilén ◽  
D. Lumley ◽  
A. Nordqvist
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Sludge Treatment ◽  
Trickling Filters ◽  
Secondary Settling ◽  
Determining Factor ◽  
Maximal Capacity ◽  
Highly Loaded

Secondary settling dynamics at maximal capacity were investigated at a full scale wastewater treatment plant which utilizes a unique process solution incorporating pre-denitrification with postnitrification in nitrifying trickling filters. Since nitrogen removal is greater when more secondary effluent is recirculated to the trickling filters, the secondary settlers generally operate at close to their maximal capacity. The settling and flocculation properties of the activated sludge are therefore a major capacity-determining factor for plant operation. Due to the short sludge age, the flocculation properties, with respect to both thickening and clarification, can change quickly. The dynamics in these changes were studied and the factors that determine the maximal settling capacity were assessed. Solids flux curves were constructed from batch settling tests and compared with the actual maximal settling capacities.

Upgrading of the wastewater treatment plant of the city of Oldenburg

1994 ◽  
Vol 29 (12) ◽  
pp. 89-95 ◽  
Author(s):  
Rolf Kayser
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Phosphate Removal ◽  
Single Stage ◽  
Anoxic Zone ◽  
Two Stage ◽  
Flexible Operation ◽  
The City

Instead of a planned two stage activated sludge plant the design was changed to a single stage activated sludge plant with enhanced biological phosphate removal and pre-anoxic zone denitrification. For flexible operation it is possible to vary the rato of VD/V from 0.3 to 0.5. Problems with the aeration equipment in the nitrification/denitrification cells occurred and were solved. The circular clarifiers are equipped with scrapers. Instead of a sludge hopper a collector in the centre of the tank was constructed.

High Rate Air Activated Sludge Operation at the City of Los Angeles Hyperion Wastewater Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 75-87 ◽  
Author(s):  
Y. J. Shao ◽  
J. Crosse ◽  
E. Keller ◽  
D. Jenkins
Keyword(s):  
Los Angeles ◽  
Activated Sludge ◽  
Treatment Plant ◽  
High Rate ◽  
Secondary Effluent ◽  
Biological Phosphorus Removal ◽  
Anaerobic Digesters ◽  
Effluent Quality ◽  
The City ◽  
Biological Phosphorus

The City of Los Angeles USA Hyperion Treatment Plant (HTP) implemented high rate air activated sludge operations in November 1989. Using this process, the secondary treatment organic loading (F/M) was increased from 0.5 to 1.0 kg BOD/kg MLVSS/day and the MCRT reduced from 3.1 days to 1.5 days, thereby enabling the secondary treated flow to be increased from 150 mgd to 200mgd (6.6 to 8.8 m3/s). Excellent secondary effluent quality (BOD5 = 15 mg/l, carbonaceous BOD5 = 6 mg/l, SS = 6 mg/l) is currently obtained using rectangular secondary clarifiers operated at surface overflow rates of 1,100 gal/day/ft2 (43 m3/m2/day) and low MLSS concentrations (950 mg/l). The enhanced biological phosphorus removal that was obtained when operating at a 3 day MCRT was eliminated in the change to high rate operation and struvite (MgNH4PO4(c)) build-up in the anaerobic digesters has been eliminated. Nocardia scum formation, with its odor generating potential and other associated operating problems, has also been eliminated by high rate operation.

scholarly journals Influence of spent drilling mud on sedimentation time of activated sludge flocs

2021 ◽  
Vol 2130 (1) ◽  
pp. 012024
Author(s):  
W Cel
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Biological Degradation ◽  
Drilling Mud ◽  
Treatment Efficiency ◽  
Sludge Flocs ◽  
Quantitative Changes ◽  
Drilling Muds

Abstract Co-treatment of drilling muds with municipal wastewater in the reactors operating on the activated sludge principle constitutes a potentially safe method of their disposal. The method is based on the process of biological degradation of pollutants by assemblages of activated sludge organisms (prokaryotic and eukaryotic), which include different species described as functional and trophic groups. When the ecosystem in the bioreactor is in equilibrium, high wastewater treatment efficiency and process stability can be achieved. Analysis of qualitative and quantitative changes occurring in assemblages of activated sludge organisms may facilitate understanding the causes and mechanisms involved in the observed processes. In such a context, using a model of an SBR wastewater treatment plant, a study was performed to assess the feasibility of co-treating spent drilling mud with municipal wastewater using the activated sludge method. The floc constitutes the basic structural and physiological unit forming activated sludge. In this study, the sedimentation velocity of activated sludge flocs was analysed, and the obtained results were subjected to statistical analysis.

scholarly journals Determination of inert Chemical Oxygen Demand (COD) fractions of Cumhuriyet University wastewater

2013 ◽  
Vol 8 (1) ◽  
pp. 31-36
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Batch Reactors ◽  
Biological Degradation ◽  
University Campus ◽  
Activated Sludge System ◽  
Wastewater Samples

Some amounts of inert products are given into environment due to biological degradation of substrate in activated sludge system. The effluent of biological wastewater treatment consists of inert substrate in influent flow, soluble microbial products and non degradable or slowly degradable organic products. Soluble inert COD (SI) must be determined for discharge standards since it did not give any reaction in activated sludge system and was given with wastewater discharge. However particular inert COD (XI) accumulated in system depending on sludge retention time due to it is only wasted from system by wasted sludge. This study focused on inert fractions of Cumhuriyet University campus wastewater which consists of domestic, hospital and laboratory wastewaters. Experimental method was used suggested by Orhon et al. and modified by Germirli et al. in order to determine directly influent particulate and soluble inert fractions. According to the experimental procedure three aerobic batch reactors, two with the wastewater and the third with glucose were run parallel. In the reactors, the change in the soluble COD profiles is observed for a period during which all degradable COD is entirely depleted, in other words, the COD profiles reach a plateau and remain unchanged. Wastewater samples were taken equalization tank in wastewater treatment plant. The conventional parameters of campus wastewater characterization were as follows: Total COD (CT0) = 372 mg l-1, total soluble COD (STO) = 124 mg l-1, total suspended solids (TSS) =177 mg l-1, ammonia (NH3) = 31.2 mg l-1, ortho-phosphate (PO4-P) = 11.3 mg l-1 and pH=7,4 . In this study, in order to determine inert COD fractions in Cumhuriyet University campus wastewater, three aerobic batch reactor systems were used. At the end of approximately 381 h operation, COD composition of campus wastewater were found to be CT0=372 mg l-1, XS0=56 mg l-1, SS0=104 mg l-1, CS0=149 mg l-1, SI=12 mg l-1, XI=211 mg l-1, respectively.

Intensification of Prague Central WWTP - Ten years of practical experiences with the in-situ bioaugmentation nitrification method

2009 ◽  
Vol 4 (1) ◽  
Author(s):  
J. Wanner ◽  
M. Kos ◽  
L. Novák
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Environmental Law ◽  
Treatment Plant ◽  
Acquis Communautaire ◽  
Complete Adaptation ◽  
Practical Experiences ◽  
The City ◽  
The Eu

Wastewater treatment has been performed in the City of Prague for more than one hundred years. However, with the complete adaptation of the EU legislation (acquis communautaire) into the national Czech environmental law, the City of Prague will have to build and put into operation a new nutrient removal activated sludge plant by year 2010. The activated sludge process will employ the original Czech technique of in-situ bioaugmentation of nitrification in regeneration zone. The in-situ bioaugmentation method has been successfully used in the last ten years in the upgraded existing plant with very good results. The new wastewater treatment plant will be located on the area of the current wastewater plant as well as on the area of the so-called gardens. The application of the in-situ bioaugmentation technique will help to keep the new plant as compact as possible which is necessary because of the limited space of the Cisarsky island.

scholarly journals Quality of the Performance of the Wastewater Treatment Plant in the City of Hoceima, Morocco

2019 ◽  
Vol 9 (1) ◽  
pp. 2345-2348
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Low Load ◽  
Reduce Emissions ◽  
The City ◽  
Vital Resource

Renewable freshwater is a vital resource for life. Today, economic development goes hand in hand with the increase in consumption and the emergence of problems of availability or quality. The wastewater is treated in a wastewater treatment plant (Step) was late to reduce emissions and improve the protection of ecosystem quality. This study is the objective of ' exploring the cleansing station performance. The results show that the station ' Hociema by low load activated sludge allows eliminates bout 30 % to 70% for BOD5 . Nevertheless, the chemical oxygen demand is eliminated between 56% and 73% , and the COD/BOD5 ratio shows the biodegradable nature of the effluents that can be treated by a biological system, ie activated sludge treatment. from the city of Hoceima performing

DESIGN PLANNING WASTEWATER TREATMENT PLANT OF NATA DE COCO INDUSTRY WITH THE ACTIVATED SLUDGE PROCESS

2016 ◽  
Vol 9 (2) ◽  
Author(s):  
Dinda Rita K. Hartaja ◽  
Imam Setiadi
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Appropriate Technology ◽  
Waste Water Treatment Plant ◽  
Activated Sludge Process ◽  
High Level

Generally, wastewater of nata de coco industry contains suspended solids and COD were high, ranging from 90,000 mg / l. The high level of of the wastewater pollutants, resulting in nata de coco industry can not be directly disposed of its wastewater into the environment agency. Appropriate technology required in order to process the waste water so that the treated water can meet the environmental quality standards that are allowed. Designing the waste water treatment plant that is suitable and efficient for treating industrial wastewater nata de coco is the activated sludge process. Wastewater treatment using activated sludge process of conventional (standard) generally consists of initial sedimentation, aeration and final sedimentation.Keywords : Activated Sludge, Design, IPAL

Sign in / Sign up

Export Citation Format

Share Document