The Implementation of Biological Phosphorus and Nitrogen Removal with the Bio-Denipho Process on a 265,000 PE Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 161-168 ◽  
Author(s):  
J. Einfeldt
Keyword(s):  
Nitrogen Removal ◽  
Treatment Plant ◽  
First Year ◽  
In Series ◽  
Design Loads ◽  
Last Stage ◽  
Two Stages ◽  
The City ◽  
Biological Phosphorus

A process, called Bio-Denipho, for combined biological phosphorus and nitrogen removal in a combination of an anaerobic tank and two oxidation ditches is described. In this process the anaerobic tank consisting of three sections working in series is followed by two oxidation ditches. These too are working in series, but with both inlet to and outlet from the tanks changing in a cycle. The Bio-Denipho process is described specifically for the process itself and as a case study for the implementation of the process on a 265,000 pe wastewater treatment plant for the city of Aalborg in Denmark. The plant was designed and erected in two stages and the last stage was inaugurated October 31,1989. Lay-out and functions for the plant is described and design loads, plan lay-out and tank volumes are given in this paper together with performance data for the first year in operation.

Field Performance and Analysis of 3-m-Diameter Induced Trench Culvert under a 19.4-m Soil Cover

2008 ◽  
Vol 2045 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Bethanie A. Parker ◽  
Rodney P. McAffee ◽  
Arun J. Valsangkar
Keyword(s):  
Pressure Distribution ◽  
Earth Pressure ◽  
Field Performance ◽  
Overburden Pressure ◽  
Vertical Pressure ◽  
Earth Pressures ◽  
Design Loads ◽  
Horizontal Pressure ◽  
Two Stages

An induced trench installation was instrumented to monitor earth pressures and settlements during construction. Some of the unique features of this case study are as follows: (a) both contact and earth pressure cells were used; (b) part of the culvert is under a new embankment and part was installed in a wide trench within an existing embankment; (c) a large stockpile was temporarily placed over the induced trench; and (d) the compressible material was placed in two stages. The maximum vertical pressure measured in the field at the crown of the culvert was 0.24 times the overburden pressure. The maximum horizontal pressure measured on the side of the culvert at the springline was 0.45 times the overburden pressure. The column of soil directly above the compressible zone settled approximately 40% more than did the adjacent fill. The field results at the crown and springline compared reasonably with those observed with numerical modeling. However, the overall pressure distribution on the pipe was expected to be nonuniform, the average vertical pressure calculated by using numerical analysis on top of the culvert over its full width was 0.61 times the overburden pressure, and the average horizontal pressure calculated on the side of the culvert over its full height was 0.44 times the overburden pressure. When the full pressure distribution on the pipe is considered, the recommended design loads from the Marston–Spangler theory slightly underpredict the maximum loads, and the vertical loads control the design.

scholarly journals The city as a theatre of characters. John Hejduk’s Masques

2021 ◽  
Vol 9 (2) ◽  
pp. 51
Author(s):  
Luca Cardani
Keyword(s):  
Design Research ◽  
Strong Connection ◽  
Theoretical Design ◽  
In Series ◽  
Place Of Origin ◽  
The One ◽  
The City ◽  
General Work ◽  
Different Parts

The architectural work of John Hejduk (1929-2000) is marked by theoretical-design research, collected in series with titles and periods. Among these series the one entitled Masques, developed since about 1979, can be considered the nucleus of his research on the architecture of the city and the place of origin of his language of construction later developed in his realized buildings. This paper analyses the dense network of references and analogies established by Hejduk to create his Masques, trying to fix its origin in the idea of the city as a theatre of characters composed of architecture. Starting from the name chosen for the title of this series, the paper tries to trace the threads that lead from the general work of the various projects of the Masques series, to the reflections and ideas that produced it. Then, it comes back again to the observation of architecture and of a case study (Security, 1989), to understand and explain its meaning and the compositional methods involved into the process of genesis of form. Through the entire work named Masques, and its recognizable link with the buildings and installation realized around the world, Hejduk has built an archive of architectural prototypes ready to construct different parts of the city, thus highlighting the strong connection that his work establishes with reality in order "to conceive it, represent it and finally realize it".

scholarly journals An application of a water assessment and simulation model in the remediation of the eutrophication capacity of a tropical water system: Case study the Lake Obili in Yaounde (Cameroon)

2017 ◽  
Vol 33 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Gideon A. Ajeagah ◽  
W. Victorien B. Abanda ◽  
George E. Nkeng
Keyword(s):  
Environmental Protection Agency ◽  
Treatment Plant ◽  
Water System ◽  
Quality Analysis ◽  
Lake Ecosystem ◽  
Biological Engineering ◽  
Tropical Water ◽  
Incentive Policies ◽  
The City

Abstract Lake Obili is one of the most famous lakes in the city of Yaounde, Cameroon. Studies carried out in this lake showed that it was hyper eutrophic and therefore it represents a great danger because it is used for aquaculture, tourism and a suitable laboratory for hydro-biological engineering. It is thus very vital to restore this lake ecosystem that singles itself in the heart of the city of Yaounde. This can be greatly facilitated through the use of Water Quality Analysis Simulation Program (WASP) of the United State Environmental protection Agency (USEPA). The outcomes of the previous results obtained from EUTRO, a Subroutine of the WASP model specialised in determining eutrophication level have proven that the remediation of this lake can be achievable through the implementation of a wet dredging, the construction and restoration of a wastewater treatment plant, the implementation of environmental incentive policies and the arrangement of the access to the lake. The application of the model is a contribution to the scientific mastery of nutrient flow, lake functioning and possibilities of restauration of highly polluted tropical water bodies subjected to domestic and industrial pollution.

Emission-immission based design of combined sewer overflows and treatment plant - the dresden case study

1997 ◽  
Vol 36 (8-9) ◽  
pp. 355-359
Author(s):  
L. Fuchs ◽  
D. Gerighausen ◽  
S. Schneider
Keyword(s):  
Treatment Plant ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Sewer Overflows ◽  
Set Up ◽  
The City

For the city of Dresden a general master plan was set up based on investigations of the hydraulic capacity of the sewer system, the loads from combined sewer overflow and the treatment plant. The total emission from combined sewer overflows and treatment plant was the main criteria for the analysis of the efficiency of different renovation alternatives. The effect of the different alternatives on the quality of the receiving waters was investigated with a water quality model and evaluated with different approaches.

scholarly journals Strategies for achieving energy neutrality in biological nutrient removal systems – a case study of the Slupsk WWTP (northern Poland)

2016 ◽  
Vol 75 (3) ◽  
pp. 727-740 ◽  
Author(s):  
Ewa Zaborowska ◽  
Krzysztof Czerwionka ◽  
Jacek Makinia
Keyword(s):  
Nutrient Removal ◽  
Operating Cost ◽  
Treatment Plant ◽  
Electric Energy ◽  
Energy Deficit ◽  
Biological Nutrient Removal ◽  
Reject Water ◽  
Northern Poland ◽  
The City

The paper presents a model-based evaluation of technological upgrades on the energy and cost balance in a large biological nutrient removal (BNR) wastewater treatment plant (WWTP) in the city of Slupsk (northern Poland). The proposed upgrades include chemically enhanced primary sludge removal and reduction of the nitrogen load in the deammonification process employed for reject water treatment. Simulations enabled to estimate the increased biogas generation and decreased energy consumption for aeration. The proposed upgrades may lead the studied WWTP from the energy deficit to energy neutrality and positive cost balance, while still maintaining the required effluent standards for nitrogen. The operating cost balance depends on the type of applied coagulants/flocculants and specific costs of electric energy. The choice of the coagulant/flocculent was found as the main factor determining a positive cost balance.

scholarly journals Side stream treatment nitrogen removal: alternatives for New York City

2017 ◽  
Vol 12 (1) ◽  
pp. 179-185 ◽  
Author(s):  
K. Ramalingam ◽  
J. Fillos ◽  
M. Mehrdad ◽  
D. Halim ◽  
A. Deur ◽  
...  
Keyword(s):  
New York ◽  
New York City ◽  
Nitrogen Removal ◽  
York City ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Cost Comparison ◽  
Waste Water Treatment Plant ◽  
Side Stream ◽  
The City

New York City Environmental Protection (NYCEP) is in the process of upgrading its treatment plants for nitrogen removal and is treating centrate, the side stream emanating from the anaerobic digestion process separately (SCT). The City is currently using a multi prong approach to treat centrate. Currently it uses the conventional nitrification/denitrification process with caustic and carbon addition at some of the plants and has the world's largest SHARON® demonstration facility at one site. In addition, the City is exploring the use of the anammox process as a viable alternative to the above two processes. To this effect, a pilot MBBR partial nitritation/anammox (PNA) reactor was operated in conjunction with the City College of New York (CCNY) at the 26th Ward Waste Water Treatment Plant in Brooklyn, NY. PNA is a nitrogen removal process that has a low carbon footprint and fits a low energy framework exceedingly well with low aeration and no external carbon requirements. Conducting a cost comparison of the PNA process to the conventional SCT and the SHARON® process on a cost per pound of nitrogen removed basis, it is found that the operating costs for the PNA process is only 35% of the SCT and 65% of the SHARON®, thus delivering substantial savings to the City when adopted at full-scale for future decades.

scholarly journals PENGARUH INSTITUSI PENDIDIKAN DAN RUMAH SAKIT TERHADAP TRANSFORMASI KAWASAN PERUMAHAN MELALUI ANALISIS TIPOMORFOLOGI

2018 ◽  
Vol 16 (1) ◽  
pp. 32
Author(s):  
Mariska Pratimi ◽  
Azzahra M.Firdausah
Keyword(s):  
Homogeneous Function ◽  
Residential Areas ◽  
Second Stage ◽  
Commercial Activities ◽  
Function Change ◽  
Commercial Housing ◽  
Invasion Pattern ◽  
Two Stages ◽  
The City

<p align="center"><strong>ABSTRAK</strong></p><p><strong> </strong></p><p>Fenomena menjadikan rumah tinggal sebagai rumah-usaha di beberapa kawasan perumahan, ditunjukkan dengan terjadinya masuknya fungsi baru ke dalam suatu fungsi yang homogen. Adanya aktifitas komersial pada kawasan perumahan akan mengakibatkan perubahan tatanan ruang lingkup hunian secara fisik maupun non fisik. Penelitian ini dilakukan dengan dua tahap, tahap pertama mengidentifikasi metode-metode yang digunakan untuk menganalisis perubahan fungsi lahan. Tahap kedua yaitu menguji metode yang terpilih pada studi kasus pada sebuah perubahan fungsi kawasan perumahan di Kota Bandung. Hasil identifikasi metode ditemukan bahwa tipomorfologi dapat  digunakan untuk menerangkan perubah-perubahan dari suatu tipe, di mana suatu tipe memiliki ciri-ciri tertentu yang dapat membedakannya dengan tipe-tipe yang lain. Proses perubahan fungsi yang terjadi pada Koridor Hasanudin dan Prof. Eykman sangat dipengaruhi oleh adanya aktivitas rumah sakit dan universitas sehingga pola perkembangan yang terjadi adalah pola invasi linear dan pola dominasi radial. Perubahan fungsi yang terjadi pada dua koridor memberikan dampak berupa gangguan lalu lintas akibat on street parking dan perubahan sirkulasi jalan.</p><p> </p><p>Kata kunci: komersial, perumahan, perubahan fungsi, tipomorfologi</p><p> </p><p><strong> </strong></p><p align="center"><strong><em>ABSTRACT</em></strong></p><p><em>The phenomenon of making a home as a business house in several residential areas is indicated by the entry of a new function into a homogeneous function. The presence of commercial activities in residential areas will result in changes in the physical and non-physical occupancy scope of the occupancy. This research was conducted in two stages, the first stage identified the methods used to analyze changes in land functions. The second stage is testing the method chosen in the case study on a change in the function of the residential area in the city of Bandung. The method identification results found that typomorphology can be used to explain changes of a type, where a type has certain characteristics that can distinguish it from other types. The function change process that occurs in the Hasanudin Corridor and Prof. Eykman is strongly influenced by the activities of hospitals and universities so that the pattern of development that occurs is a linear invasion pattern and a pattern of radial dominance. Function changes that occur in the two corridors have an impact in the form of traffic disruption due to on street parking and changes in road circulation.</em></p><p><em> </em></p><p><em>Keywords: commercial, housing, function change, typomorphology</em></p>

Operation of Centralized Sludge Treatment Facilities

1991 ◽  
Vol 23 (10-12) ◽  
pp. 1753-1762 ◽  
Author(s):  
Senji Kaneko ◽  
Hachiro Shimomura
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Service Rate ◽  
First Year ◽  
Sludge Treatment ◽  
Efficient Treatment ◽  
Treatment Facilities ◽  
Treatment And Disposal ◽  
The City

Construction of sewerage systems in the city of Yokohama has proceeded at a rapid pace ever since the first wastewater treatment plant went into operation in 1962. By 1984, all eleven of the planned wastewater treatment plants were in operation. By March 1989, the sewerage service rate had reached 80 percent, representing over 2.56 million of the city's residents. Naturally, the expansion of the sewerage system was reflected in a commensurate increase in the quantity of sludge for treatment and disposal. Recognizing the critical importance of keeping abreast of this increase, the city has promoted the development of technology for more efficient treatment and disposal of sludge throughout the intervening years. In recent years, the city has also seen extensive urbanization and mounting concern among its citizenry for conserving the environment. In response, it was decided to shift from the former decentralized method of sludge treatment (i.e., treatment of sludge at the plant generating it) to a method of centralized treatment at two sludge treatment centers, each built within a different wastewater treatment plant located in the waterfront area. Yokohama was the first city in Japan to adopt this form of centralized sludge treatment. The construction of the centralized sludge treatment facilities made extensive use of results from a program of technological development. The centers feature the first egg-shaped digestion tanks, a high-concentration mode of digestion made possible by the use of centrifugal thickeners, power generator fueled with digestion gas, effective use of the waste heat from these generators, and the saving of fuel by the use of incinerators equipped with dryers. The record for the first year of full-scale operation clearly demonstrated the merits of centralized treatment. The quantity of digestion gas generated at the center was double that of the quantity generated under the former method for an equivalent quantity of sludge. Power generation fueled by digestion gas supplied 64 percent of the center's own power needs. While operating at only one-fifth of the planned sludge capacity, the center boasted a savings of about 200 million yen for the year, and the treatment costs were less than half of the treatment cost of the same quantity utilizing the former method. This report presents an account of the operational record for the first year of this center (the Hokubu Sludge Treatment Center) and the system of effective energy use that took place in it.

Optimization of a nutrient-removing wastewater treatment plant using on-line monitors

1996 ◽  
Vol 33 (1) ◽  
pp. 265-273 ◽  
Author(s):  
John Sørensen
Keyword(s):  
Wastewater Treatment ◽  
Control System ◽  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Treatment Plant ◽  
Biological Phosphorus Removal ◽  
Biosorption Process ◽  
On Line ◽  
Biological Phosphorus ◽  
P Removal

Marselisborg WWTP is designed for 220,000 population equivalent as an AB process i.e. biosorption followed by a BIO-DENITRO plant. The plant was designed to remove nitrate in summer only. It was designed to remove phosphorus by pre-precipitation in the biosorption process and by simultaneous precipitation in the biological tanks. Introduction of an on-line control system for the nitrogen removal made it possible to remove nitrate all year to effluent values 1-3 mg N/l below the effluent standard of 8 mg N/l. The control system automatically introduced about 50% longer denitrification time in the tanks. During the last 4 years, the amount of filtered COD has through optimization increased from 65% to above 80% in relation to total COD. This in combination with the longer time without aeration in the biological tanks has made it possible to optimize biological phosphorus removal at the plant. It is possible to remove about 400 kg P/d biological out of about 500 kg P/d. Strategies to run the biological P removal simultaneously with the nitrogen removal in the same biological tanks has been tested. It seems possible to control the biological phosphorus removal by modifying the on-line control system for the nitrogen removal.

Introducing biological phosphorus removal in an alternating plant by means of control: a full scale study

2006 ◽  
Vol 53 (4-5) ◽  
pp. 133-141 ◽  
Author(s):  
C. Rosen ◽  
P. Ingildsen ◽  
T. Guildal ◽  
T. Munk Nielsen ◽  
M.K. Nielsen ◽  
...  
Keyword(s):  
Control System ◽  
Nitrogen Removal ◽  
Control Strategy ◽  
Phosphorus Removal ◽  
Treatment Plant ◽  
Full Scale ◽  
Biological Phosphorus Removal ◽  
Fully Integrated ◽  
Biological Nitrogen ◽  
Biological Phosphorus

In this paper, a control strategy for introducing enhanced biological phosphorus removal (EBPR) in an alternating plant designed for enhanced biological nitrogen removal (EBNR) is presented. Alternating aerobic and anaerobic conditions to promote EBPR are provided by controlling the phases of the operational cycle, instead of a separate anaerobic volume. By utilising the control schemes already built in the STAR® control system for nitrogen removal, the control strategy is fully integrated in the system. The control system relies on on-line measurements of nitrogen (ammonia and/or nitrate) and orthophosphate. The control strategy has been implemented in full-scale operation at the Avedøre wastewater treatment plant in Denmark and the results show clear indications of success. The control strategy has operated robustly for several months with a 60% decrease in use of precipitation chemicals.

Sign in / Sign up

Export Citation Format

Share Document