Bidding of the ‘Agua Prieta’ Wastewater Treatment Plant for the city of Guadalajara, México

2012 ◽  
Vol 7 (1) ◽  
Author(s):  
H. Pérez ◽  
C. Coll ◽  
R. Robles ◽  
T. Martínez ◽  
G. Limón
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Primary Treatment ◽  
Mean Flow ◽  
Start Up ◽  
Activated Sludge Reactor ◽  
Under Construction ◽  
Technical Features ◽  
Bidding Process

During 2008 and 2009 a bidding process was undertaken for the Agua Prieta Wastewater Treatment Plant. The awarded contract included partial financing, design, build, equipment supply, start up and 20 years operation and maintenance. Plant capacity is 8,500 L/s as mean flow and population equivalent of 4.9 millions. The treatment process is composed of pretreatment, primary treatment, activated sludge reactor and secondary clarification. Sludge is anaerobically digested, using the produced biogas for electricity cogeneration. The site in which the plant is located has significant restrictions in relation to size and other features. These had a relevant impact in the offered treatment processes. The purpose of this paper is to share the experiences gained in this complex bidding process, including the guidelines and design criteria incorporated in the bidding documents, as well as the main technical features of the selected proposal. The plant is presently under construction.

Rehabilitation and Upgrading of the Beni Suef City Wastewater Treatment Plant

1990 ◽  
Vol 22 (7-8) ◽  
pp. 131-138
Author(s):  
Ahmed Fadel
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Primary Treatment ◽  
High Rate ◽  
Shock Load ◽  
Economic Evaluations ◽  
Activated Sludge Process ◽  
Trickling Filter

Many of Egypt's cities have existing treatment plants under operation that have been constructed before 1970. Almost all of these treatment plants now need rehabilitation and upgrading to extend their services for a longer period. One of these plants is the Beni Suef City Wastewater Treatment Plant. The Beni Suef WWTP was constructed in 1956. It has primary treatment followed by secondary treatment employing intermediate rate trickling filters. The BOD, COD, and SS concentration levels are relatively high. They are approximately 800, 1100, and 600 mg/litre, respectively. The Beni Suef city required the determination of the level of work needed for the rehabilitation and upgrading of the existing 200 l/s plant and to extend its capacity to 440 l/s at year 2000 A description of the existing units, their deficiencies and operation problems, and the required rehabilitation are presented and discussed in this paper. Major problems facing the upgrading were the lack of space for expansion and the shortage of funds. It was, therefore, necessary to study several alternative solutions and methods of treatment. The choice of alternatives was from one of the following schemes: a) changing the filter medium, its mode of operation and increasing the number of units, b) changing the trickling filter to high rate and combining it with the activated sludge process, for operation by one of several possible combinations such as: trickling filter-solids contact, roughing filter-activated sludge, and trickling filter-activated sludge process, c) dividing the flow into two parts, the first part to be treated using the existing system and the second part to be treated by activated sludge process, and d) expanding the existing system by increasing the numbers of the different process units. The selection of the alternative was based on technical, operational and economic evaluations. The different alternatives were compared on the basis of system costs, shock load handling, treatment plant operation and predicted effluent quality. The flow schemes for the alternatives are presented. The methodology of selecting the best alternative is discussed. From the study it was concluded that the first alternative is the most reliable from the point of view of costs, handling shock load, and operation.

A new method of biological start-up in Arak activated sludge wastewater treatment plant

2013 ◽  
Vol 8 (2) ◽  
pp. 234-243 ◽  
Author(s):  
Abdolreza Khalili ◽  
Mohammad Reza Mohebi ◽  
Mohammad Mohebi ◽  
Farideh Ashouri
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
New Method ◽  
Cold Weather ◽  
Similar Treatment ◽  
Start Up ◽  
Seed Saving ◽  
Foam Forming

Starting up a wastewater treatment plant (WWTP) is one of the most important stages of operation. A new method was used to start Arak activated sludge WWTP up, which took in advantages of the other methods. Primarily just one of the basins was in the lane and wastewater entered the plant part by part. At first 1/30, second week 1/15, third week 1/6, and fourth week 1/3 of total inflow came to the plant. Observing little progress of biomass gain, some sludge from a similar treatment plant was added to the system, as seed. This procedure continued so the MLSS of the system, attained the 1/3 total design MLSS which was design MLSS of one basin. In the next two weeks, by using developed sludge of the self-system the second and third basins came in the lane and inflow increased to 2/3 and total flow, respectively. Finally after two months of beginning the start-up and one month after adding the seed total desired biomass was developed and the plant started to waste sludge. Because of cold weather start-up period took a longer time than expected. But even before developing biomass environment friendly results were achieved. After attaining design MLSS, BOD5 and COD removal from 40% and 60% increased to 90% and TSS removal from 70% reached to 96%. Less loading, less foam forming, no bacteriologic and chemical problems, better process control, using less seed, saving costs in sludge transport and avoiding relevant problems were the main advantages of this method.

scholarly journals Quality Assessment of Full-Scale Municipal Wastewater Treatment Plant Consisting UASB Reactors and Polishing Ponds During its Start-Up Phase in India

2016 ◽  
Vol 11 (1) ◽  
pp. 47-55
Author(s):  
Nadeem Khalil ◽  
Tarique Ahmad
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Quality Assessment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Municipal Sewage ◽  
Anaerobic Sludge ◽  
General Hypothesis ◽  
Start Up ◽  
Uasb Reactors

Amongst the technologies available, the up flow anaerobic sludge blanket (UASB) process has been one of the most widely applied methods for municipal waste water treatment especially in countries of warm climatic conditions like India. However, past about one decade has witnessed rapid decline in the UASB popularity and its implementation. There has been criticism from various sections on the performance of UASB reactors for not complying with the prescribed discharge standards. It is a general hypothesis that the UASB reactors are not meant for diluted waste water like municipal sewage when typically the BOD is less than 150 mg/l, COD 250 mg/l and sulphates are more than 150mg/l. An attempt has been made through this study to investigate the reasons on the basis of quality assessment and field observations on UASB reactors and it’s post-treatment of a newly commissioned (start-up) municipal (sewage) wastewater treatment plant commonly called ‘STP’ having capacity of 14 million litres per day (MLD). Study was aimed to know the gaps during the commissioning stage which could be related to poor removal efficiencies. This paper briefly discusses some issues related to operation and maintenance of the UASB plants with purpose for improvements.

Application of reversed A2/O process on removing nitrogen and phosphorus from municipal wastewater in China

2011 ◽  
Vol 63 (10) ◽  
pp. 2138-2142 ◽  
Author(s):  
X. S. Kang ◽  
C. Q. Liu ◽  
B. Zhang ◽  
X. J. Bi ◽  
F. Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Practical Application ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
New Process ◽  
Technical Features

The application of reversed A2/O process in practice in China is mainly discussed in this paper. As a new process on nitrogen and phosphorus removal, principle and technical features of reversed A2/O process are also summarized. The application in rebuilt wastewater treatment plant shows that reversed A2/O process not only has merits on high nitrogen and phosphorus removal efficiency, but also has merits on energy saving. The application in newly-build wastewater treatment plant shows that infrastructure and equipment investment of reversed A2/O process economized 15% and 10% respectively, compared to conventional A2/O process. The practical application shows that reversed A2/O process is a new nitrogen and phosphorus removal process, which is suitable for China's national conditions.

scholarly journals Study of settling velocity of sand particles located in wastewater treatment plant

2011 ◽  
Vol 59 (1) ◽  
pp. 249-254 ◽  
Author(s):  
Tomáš Vítěz ◽  
Petr Trávníček
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Settling Velocity ◽  
Treatment Plant ◽  
Primary Treatment ◽  
Sewage Water ◽  
Sewer System ◽  
Wastewater Purification ◽  
Sand Particles

The objective of this paper was to determine and compare the theoretical and experimental settling velocity of sand particles in the water. For the determination of settling velocity sand from wastewater treatment plant was selected. Sand is transported to the wastewater treatment plant by a sewer system with sewage water, especially in locations with a combined sewer system. It is necessary to capture and separate sand in the first step of wastewater purification, which is called primary treatment, otherwise sand can cause problems in the technological line that will have an impact mainly on the economy of operation. For sand capture sedimentation is usually used, principle of sedimentation is based on physical properties of the sand, especially depends on density of the sand. For the experimental measurement of the settling velocity of the sand a laboratory track path had been created. Obtained settling velocities were compared to theoretically calculated settling velocities in accordance with the Stokes Law, Allen’s Law and Newton’s Law.

scholarly journals Documentation of a Collection from the Poole Site (41TT47) in the Big Cypress Creek Basin in East Texas

2012 ◽  
Author(s):  
Timothy K. Perttula
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Archaeological Survey ◽  
Stock Tank ◽  
Mount Pleasant ◽  
Small Collection ◽  
Bone Fragments ◽  
New City ◽  
Under Construction

The Poole site (41TT47) is about 2.5 miles south of Mt. Pleasant, and is now situated within the Mount Pleasant Wastewater Treatment Plant. The site was originally recorded by Milton Bell and Ken Brown in 1971 , who described it as "a thin scatter of artifacts, bone fragments, and charcoal necks brought to surface on gopher hills." The site was estimated at ca. 50 x 50 m in size; the artifacts "occurred mostly at the south side of the site. A metate was found in the center of the darker area. Wood charcoal flecks may be from more recent clearing." Their site map showed a 10 x 12 m area with a dark organic staining, possibly evidence for a midden, or more recent burning activities. Bell and Brown suggested that the site may have a Late Caddo (ca. A.D. 1430-1680), Titus phase, occupation. At the time the site was recorded in 1971, it appeared to be basically undisturbed, except for activities associated with the construction of a stock tank and its associated earthen berm just to the southeast of the Poole site. Thurmond subsequently examined a small collection of sherds from the Poole site, and described it as a "Late Caddoan limited use area." The Late Caddoan attribution of the site was based on one brushed body sherd and a Maydelle Incised jar rim. In 1990, the Mount Pleasant Wastewater Treatment Plant was under construction on the northern end of the Poole site, across a fence line from a pasture where intact archeological deposits likely remained undisturbed. At that time, a small collection of artifacts was obtained from a private individual from the northern part of the Poole site before a lab building was fully constructed on the southern part of this tract of land. It is those artifacts that are the subject of this article . According to Perttula and Nelson, who conducted an archaeological survey of a part of the Poole site in 1999 because of proposed 1999 water and sewer system lines for the new City of Mount Pleasant municipal airport, it is a small prehistoric Titus phase settlement that dates from ca. A.D. 1430-1680. Although only a small portion of the site lay within the specific project area where the archaeological survey was conducted, like most Titus phase settlements, it may well contain trash middens, evidence for structures and other features, and a small family cemetery.

SHAFDAN (Greater Tel Aviv Wastewater Treatment Plant): recent upgrade and expansion

2016 ◽  
Vol 11 (2) ◽  
pp. 288-297
Author(s):  
Arie Messing ◽  
Yuval Sela
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Construction Projects ◽  
Large Scale ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Primary Treatment ◽  
Management Program ◽  
Design Parameters ◽  
Total Capital

The SHAFDAN is the largest wastewater treatment plant in Israel and currently treats 360,000 m3/day of municipal wastewater, about 92% of its treatment capacity. Waste sludge from the plant is discharged to the Mediterranean Sea through a marine outfall. The SHAFDAN is committed to ending the disposal of its sludge to the sea by the end of 2016 by providing a land-based biosolids management program that produces a Class A biosolids for agricultural use. In order to implement this strategy, a number of large-scale construction projects were undertaken. These projects include a new sludge thickening and dewatering facility, updated headworks, a new primary treatment facility, and a new 3-stage thermophilic anaerobic digestion facility. The total capital cost of these projects is estimated to be US $300 million. This paper describes the principal components of these projects and their design parameters.

scholarly journals Quick start-up of Mudanjiang wastewater treatment plant and factors influencing phosphorous removal

2013 ◽  
Vol 8 (1) ◽  
pp. 1-8
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Phosphorus Removal ◽  
Treatment Plant ◽  
Phosphorus Release ◽  
Aeration Tank ◽  
Phosphorous Removal ◽  
Start Up ◽  
The One

Successful start-up of a full-scale wastewater treatment plant (WWTP) is a key issue for the succeeding operation of WWTP on the one hand and the nutritious phosphorus removal is of great concern on the other. After the construction of Mudanjiang WWTP with a flow rate of 100,000 m3 d-1 in Heilongjiang Province of China, a novel way of start-up through feeding wastewater continuously into the system was attempted against the conventional start-up method of inoculating activated sludge in the aeration tank by feeding wastewater intermittently. Activated sludge was cultivated and proliferated in the aeration tanks instead of dosing acclimated sludge from other source. After one-month’s start-up operation, MLSS, SV and SVI increased to 2.5 kg m-3, 30% and nearly 80% respectively, which indicated that quick and simple start-up had been achieved. After successful start-up, an investigation into phosphorus removal was conducted with the emphasis on influencing factors such as ORP and NOx-N concentration etc. When the aeration tank was switched from aerobic to anaerobic mode, phosphorus removal efficiency of 80% could be realized within the whole treatment system. Experimental results revealed that an ORP of -140 mV and NOX-N of 2 mg l-1 were critical for the anaerobic phosphorus release, and DO in the range of 1.7-2.5 mg l-1, BOD5/TP of 20-30 and SVI of 70~80 as well as SRT of 5 days were the optimal phosphorus removal conditions for the aeration tanks.

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