A new side stream process for easily degradable industrial waste waters to avoid sludge bulking

2004 ◽  
Vol 50 (7) ◽  
pp. 229-236
Author(s):  
G. Wandl ◽  
N. Matsché ◽  
H. Bayer
Keyword(s):  
Waste Water ◽  
Industrial Waste ◽  
Treatment Plant ◽  
Aeration Tank ◽  
Waste Waters ◽  
Excess Sludge ◽  
Treatment Line ◽  
Peak Loads ◽  
Side Stream ◽  
Dairy Waste

A new treatment scheme for the treatment of easily biodegradable industrial waste waters has been developed. The side stream treatment of dairy waste water with the excess sludge from the domestic treatment line of the regional treatment plant Bad Vöslau has been operated successfully for a period of three years during which the industrial load stemming from the dairy increased from 800 kg COD/d to 2,500 kg COD/d with peak loads up to 5,000 kg/d. Despite of the increased load to the treatment plant the total aeration tank volume had not been increased. This treatment is performed in an existing aeration tank of the WWTP (V = 1,800 m3) which is now used as contact tank for the combined aeration of dairy waste water and excess sludge from the domestic treatment line (volume aeration tank = 15,000 m3). In this tank the easily degradable substrate from the industrial waste is mainly adsorbed to the biological sludge and after a mechanical dewatering transferred to the anaerobic digester where it yields in an increased gas production. The filtrate of the dewatering process is completely free from biodegradable material and can without danger of bulking be fed to the aeration tank of the domestic treatment line. The new process has proven to be extremely flexible since already now daily peak loads exceeding the design load by more then 60% could be treated in the plant without any problems. Compared to other alternatives for the dairy waste water treatment that were investigated during this study, the new side stream process is very advantageous. No other pre-treatment process for industrial waste water could have been operated under comparable loading conditions without severe operating problems.

Design, Operating Results and Experiences of Two Large-Scale Treatment Plants with Biological Nitrogen and Phosphate Elimination

1992 ◽  
Vol 25 (4-5) ◽  
pp. 225-232
Author(s):  
C. F. Seyfried ◽  
P. Hartwig
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Large Scale ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Main Stream ◽  
Side Stream ◽  
Biological Nitrogen

This is a report on the design and operating results of two waste water treatment plants which make use of biological nitrogen and phosphate elimination. Both plants are characterized by load situations that are unfavourable for biological P elimination. The influent of the HILDESHEIM WASTE WATER TREATMENT PLANT contains nitrates and little BOD5. Use of the ISAH process ensures the optimum exploitation of the easily degradable substrate for the redissolution of phosphates. Over 70 % phosphate elimination and effluent concentrations of 1.3 mg PO4-P/I have been achieved. Due to severe seasonal fluctuations in loading the activated sludge plant of the HUSUM WASTE WATER TREATMENT PLANT has to be operated in the stabilization range (F/M ≤ 0.05 kg/(kg·d)) in order not to infringe the required effluent values of 3.9 mg NH4-N/l (2-h-average). The production of surplus sludge is at times too small to allow biological phosphate elimination to be effected in the main stream process. The CISAH (Combined ISAH) process is a combination of the fullstream with the side stream process. It is used in order to achieve the optimum exploitation of biological phosphate elimination by the precipitation of a stripped side stream with a high phosphate content when necessary.

scholarly journals Pathogenic micro-organisms in waste waters from daiies

2000 ◽  
Vol 18 (No. 5) ◽  
pp. 170-174
Author(s):  
P. Navrátilová
Keyword(s):  
Waste Water ◽  
Listeria Monocytogenes ◽  
Activated Sludge ◽  
Cleaning Process ◽  
Waste Waters ◽  
Excess Sludge ◽  
Salmonella Spp ◽  
Potential Health ◽  
Treated Water ◽  
Micro Organisms

Waste waters from dairies were tested for the presence of bacterial pathogens – Listeria monocytogenes, Staphylococcus aureus and Salmonella spp. The prevalence of bacteria was investigated in each stage of the cleaning process (activated sludges systems) too. Two hunder samples of raw waste water, activated sludge, returned activated sludge, excess sludge and treated water from 14 dairies were tested. The samples were all negative for Salmonella spp. From a total of 102 (51%) strains Listeria spp., Listeria inoccua 95 (47.5%) and Listeria monocytogenes 7 (3.5%) were identified. 47 samples were positive for S. aureus. L. monocytogenes were detected in raw waste water 1 (1.6%), in activated sludge 3 (5.5%), in excess sludge 1 and in treated water 2 (3.1%). S. aureus were detected in raw waste water 14 (22.6%), in activated sludge 23 (41.8%), in excess sludge 1 and in treated water 8 (12.3%). These results demonstrate a prevalence of L. monocytogenes and S. aureus in waste waters from dairies. During the cleaning process pathogenic bacteria were not devitalized. The excess sludge and treated water including pathogenic micro-organisms represent a potential health hazard.

Cost optimisation and minimisation of the environmental impact through life cycle analysis of the waste water treatment plant of Bree (Belgium)

2011 ◽  
Vol 63 (1) ◽  
pp. 164-170 ◽  
Author(s):  
K. De Gussem ◽  
T. Wambecq ◽  
J. Roels ◽  
A. Fenu ◽  
G. De Gueldre ◽  
...  
Keyword(s):  
Waste Water ◽  
Life Cycle ◽  
Environmental Impact ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Full Scale ◽  
Waste Water Treatment Plant ◽  
Aeration Tank ◽  
Environmental Footprint ◽  
Recirculation Flow

An ASM2da model of the full-scale waste water plant of Bree (Belgium) has been made. It showed very good correlation with reference operational data. This basic model has been extended to include an accurate calculation of environmental footprint and operational costs (energy consumption, dosing of chemicals and sludge treatment). Two optimisation strategies were compared: lowest cost meeting the effluent consent versus lowest environmental footprint. Six optimisation scenarios have been studied, namely (i) implementation of an online control system based on ammonium and nitrate sensors, (ii) implementation of a control on MLSS concentration, (iii) evaluation of internal recirculation flow, (iv) oxygen set point, (v) installation of mixing in the aeration tank, and (vi) evaluation of nitrate setpoint for post denitrification. Both an environmental impact or Life Cycle Assessment (LCA) based approach for optimisation are able to significantly lower the cost and environmental footprint. However, the LCA approach has some advantages over cost minimisation of an existing full-scale plant. LCA tends to chose control settings that are more logic: it results in a safer operation of the plant with less risks regarding the consents. It results in a better effluent at a slightly increased cost.

Adaption of the main waste water treatment plant in Vienna to meet Austrian emission regulations

1996 ◽  
Vol 33 (12) ◽  
pp. 65-72
Author(s):  
Harald Kainz ◽  
Herbert Hofstetter
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Optimal Solution ◽  
Evaluation Process ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Aeration Tank ◽  
Emission Regulations

The modification of the main waste water treatment plant in Vienna will take place in accordance with the minimum efficiences laid down in the emission regulations as issued in 1991 by the Austrian Federal Office for Agriculture and Forestry. To meet these figures it is necessary to adapt the plant by 2001. The studies on several variants and the evaluation process showed a 2-step technology with partial by-passing of the 1st step to be the optimal solution. For this flexible system a new aeration tank volume of only 210,000 m3 is sufficient. Test-runs with a semi-commercial plant confirmed the correctness of all calculations. Possibilities for further modifications have been considered, e.g. dimensioning of all relevant hydraulic installations up to 24 m3/sec, final purification by sand or flocculant filtration and spare areas for measures after 2015.

Minimization of Effluent Produced by Electrical Industry

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Gayatri Mahadu Mete ◽  
Snehal Anil Marathe ◽  
Saurabh Narayan Sase ◽  
Komal Ajabrao Gadekar ◽  
Shubham Sanjay Dhok ◽  
...  
Keyword(s):  
Waste Water ◽  
Industrial Waste ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Powder Coating ◽  
Galvanized Steel ◽  
Waste Water Treatment Plant ◽  
Industrial Waste Water ◽  
Treatment Unit

There are two fundamental reasons of effluent viz. prevention pollution and thereby protecting the environmental and protecting the public health by safe guarding waste supplies and preventing the spread of water borne diseases. When untreated industrial waste water is discharge it will contaminate the natural water body i.e., river, lake with hazardous chemicals. It is absolutely necessary to study the characteristic of industrial waste water, to ensure its safe disposal. These studies will help in determination the degree the type of treatment required to given waste water this avoid the pollution of sources of its disposal. Effluent produced from electronics industry is from pre-treatment of galvanized steel surface prior to the application of powder coating. Company having an In-house facility of 10 tank process for phosphating of panel for purpose of degreasing, oxidation, and oil removal. The waste water treatment plant it has been designed with Electrocoagulation treatment unit.

Planning the Disposal of Waste Waters for Small Tourist Resorts in Dalmatia

1986 ◽  
Vol 18 (9) ◽  
pp. 243-256 ◽  
Author(s):  
J. Margeta
Keyword(s):  
Waste Water ◽  
Sea Water ◽  
Treatment Plant ◽  
Optimal Solution ◽  
The Other ◽  
Technological Aspect ◽  
Waste Waters ◽  
Water Disposal ◽  
Alternative Solutions ◽  
Selection Of

Small tourist resorts in Dalmatia have some specific problems concerning waste water disposal with a special emphasis placed on the significant oscillations (daily and yearly) of waste water quantities. On the other hand, the conditions necessary for solving these problems in Yugoslavia are not very favourable when considering either the financial or the technological aspect. Taking into account the importance of the sea water quality along the coast for the economic development of these resorts as well as the difficulties arising when solving this problem, our objective was to find an optimal solution. This paper presents some alternatives for solving this problem, as well as the method used for the selection of the optimal solution. A ranking procedure is used to develop the alternative solutions and to describe their application. The solution used most frequently for the disposal of waste water i.e. the “Treatment plant-submarine discharge ”, has here been analyzed. The paper also presents the ranking of the alternative solutions and the selection of the optimal one according to the current practices in Dalmatia.

Experimental Study on the Control of Nutrients in Activated Sludge Treatment

1994 ◽  
Vol 29 (5-6) ◽  
pp. 329-342 ◽  
Author(s):  
Reijo Saunamäki
Keyword(s):  
Waste Water ◽  
Activated Sludge ◽  
Phosphorus Content ◽  
Treatment Plant ◽  
Pulp Mill ◽  
Paper Mill ◽  
Waste Waters ◽  
Phosphorus Addition ◽  
Total N ◽  
Mill Waste

Laboratory experiments were conducted to determine the need for addition of phosphorus during the treatment of pulp and paper mill waste waters by the activated sludge method. The study also included the testing of different modifications of the activated sludge method (a completely mixed, three completely mixed reactors in series, anaerobic/aerobic) to see how different forms of phosphorus and nitrogen (total-N, NH+4 - N, NO-2 - N, NO-3 - N) are present in the influent and effluent. The tests were conducted using waste water from two newsprint/magazine paper mills and from a bleached sulphate pulp mill. Different loadings and levels of phosphorus addition were applied. When paper mill waste water was treated at normal loading (sludge load was c. 0.3 kgBOD/(kgMLVSS*d)), a small phosphorus addition was needed to secure efficient operation. The optimum BOD:P ratio was about 100:0.4, in which case the treated effluent had a total phosphorus content of c. 0.5 mg/l (about 70% reduction), a soluble phosphorus content of c. 0.3 mg/l and a phosphate phosphorus content of well below 0.1 mg/l. Larger phosphorus additions produced no further improvement in treatment results (BOD reduction c. 90% and COD c. 75%). Doubling the loading gave poorer results and the situation could not be rectified by adding phosphorus. Addition of phosphorus was not needed when treating pulp mill waste water, as has also been found when running activated sludge treatment plants at several mills. The BOD reduction (c. 95%) was excellent under all conditions. The COD reduction was 30-55%, AOX 30-35% and chlorophenols 90-95%. The total phosphorus content of the treated effluent was 0.3-0.7 mg/l when no phosphorus was added. This treatment also resulted in extremely low phosphate phosphorus levels. The biosludge contained 0.5-1.9% phosphorus, 0.5-0.8% when pulp mill waste waters were treated and occasionally around 2% for the paper mill. The experiments showed that it might be possible to operate the pulp mill treatment plant with even less phosphorus in relation to BOD compared with the BOD level of waste waters to which no phosphorus has been added. The mill could consider removing the excess phosphorus originating from lime mud neutralization before the waste water arrives at the treatment plant. In treating both these waste waters there is the risk of really high phosphorus discharges if care is not taken with the phosphorus addition. A typical situation of this type arises if the plant is run on the old "textbook rule" of BOD:P=100:1. The nitrogen was added as urea resulting in the BOD:N ratio of 100:(2.5-4.5). Total-N in the paper mill untreated waste water was in the range of 8.5-13 mg/l and in the effluent 2.5 - 5.0 mg/l, i.e. the removal was 55-75%. NH+4 - N in the influent was in the range of 1.5-3.0 mg/l and was totally removed in most of the runs. The concentration of (NO-2 - N + NO-3 - N) was only 40-50 µg/l, the removal was 0-85 % depending on the conditions. The activated sludge modification "three completely mixed reactors in series" yielded the best results when all parameters were taken into account.

Floc agglomeration and structuration by a specific talc mineral composition

1997 ◽  
Vol 36 (4) ◽  
pp. 57-68 ◽  
Author(s):  
A. Bidault ◽  
F. Clauss ◽  
D. Helaine ◽  
C. Balavoine
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Research Work ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Aeration Tank ◽  
Flocculation Efficiency

The quality of the effluent from a waste water treatment plant using the activated sludge process depends upon the bacteria flocculation efficiency. Intensive research work has been devoted to understanding flocculation phenomena and to correct disorders. The addition of very fine but dense talc particles to the aeration tank immediately improves floc formation and densifies the new flocs created. In the longer term, the fine talc particles improve floc structuration and form stable and strong flocs. This has been demonstrated by running a modified activated sludge through the high shear strength of pumps and hydrocyclones. These fine talc particles offer a solution to solve floc settleability problems which so frequently arise when biological disorders appear in waste water treatment plants. Two practical cases are presented.

Treatment of easily biodegradable wastewater avoiding bulking sludge

2002 ◽  
Vol 46 (1-2) ◽  
pp. 503-506 ◽  
Author(s):  
N. Matsché ◽  
S. Winkler ◽  
L. Prendl ◽  
K. Dornhofer ◽  
G. Wandl
Keyword(s):  
Treatment Plant ◽  
Gas Production ◽  
Aeration Tank ◽  
Biodegradable Material ◽  
Excess Sludge ◽  
Food Industries ◽  
Biological Sludge ◽  
New Process ◽  
One Year ◽  
Treatment Alternatives

The presence of easily degradable compounds from food industries frequently leads to bulking problems. The paper describes a new process that has been developed for a dairy in Austria. Because of the increase in production the treatment plant receiving the wastewater up to now was not able to handle the increased loads. Therefore detailed studies for treatment alternatives have been undertaken which led to a completely new concept. The excess sludge of the urban treatment plant is contacted with the concentrated dairy waste in a separate contact tank. In this tank the easily degradable substrate from the industrial waste is mainly adsorbed to the biological sludge and after a mechanical dewatering transferred to the anaerobic digester where it yields an increased gas production. The filtrate of the dewatering process is completely free from biodegradable material and can without danger of bulking be fed to the aeration tank. The process has been in operation for more than one year and has fulfilled all expectations.

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