Stand Bid Pres

7/28/2019 Stand Bid Pres

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• STANDARD PROCEDURES

FOR BID PREPARATIONAND PROJECT REALIZATION

• EXAMPLE OF AN INTERNATIONALLY

FINANCED WWTP -

• ECI-Sinotrust Business Consulting Co., Ltd.

• Tel: 86-10-6773 8115/6/7

• Fax: 86-10-6773 8119

• E-mail: [email protected]



Table of Contents

• Project Introduction

• Tendering Conditions

• Bid Consortium• Process and Plant Design

• Equipment List

• Bid Price• Internal Evaluation Result



Project Introduction

– Project: Dairy Waste Water Treatment

– Financing: European Community

– Eligible Companies: European and Chinese

– Consultant: Danish

– Project Owner: Ministry of Agriculture

– Project Location: Five Different Sites in

Different Provinces



Tendering Conditions

• Complete Design

• Equipment Procurement

• Turnkey Supply, Erection and Startup



Bid Consortium

• Due to the tender’ s character and relatedcompetition structure a German-Chinese

consortium between the following parties has

been set up:

– General Machinery Engineering Co., Ltd.: Leader

– IfU Dr. Bernd Diering GmbH: Design

– ECI Sinotrust Co., Ltd.: Project Management



Bid Price

• ECI used all available relationships to

research and verify the likely successful bid price.

• It turned out that the price was dominated

by Chinese procurement prices.• Simultaneously it could be established that

no references for Chinese competitors are

existing.• The Chinese competition seemed to be

decisive but not ideally equipped to do the

job.



Internal Evaluation Result

• Bidding Participants: 26 among them

4 Europeans, 2 Joint Ventures

• First Ten Companies: All Chinese

• European Companies: 14th, 16th and 17th

• ECI Position: 13th bef. evaluation

• 1st

aft. evaluation



Waste Water Treatment Plants Principle Design Features and Comments

• 1. The Dairy Waste Water

• 2. The Treatment Process

• 3. Sludge Treatment

• 4. Plant Design

– 4.1 Storage Basin

– 4.2 Adsorption Stage (A-stage)

– 4.3 Activated-Sludge-Stage (B-Stage)

– 4.4 Sludge Treatment

– 4.5 Dosing Plant

• 5. Operation Costs

• Price Sheet

• Design Drawing



1. The Dairy Waste Water

– For treatment and purification of the waste water thefollowing aspects generally should be taken into

account:

– 1). Rainwater and cooling water should be

discharged through separate drainage systems.

– 2). An equalising storage tank is definitely to be

recommended. This facilitates biological treatment.

– 3). Fat and other floatable solids should be

separated in a first step before further biological

treatment.



2. The Treatment Process

• The treatment is designed as a two stage activated sludge process

generally known as AB-process. Its basic function is as follows: – - In the first high-load stage (A-stage) pollutants are predominantly bound

into the activated sludge by adsorption.

– - In the second low-load stage (B-stage) the waste water is purified by

biological degradation.

• Typical for the AB-process are the following principles:

– - observance of a high sludge range in the A-stage (maximum load

activation) with SR greater than 2 kg BOD/(kg MLSS x d)

– - separation of the biocenosis of the respective stage

– - possible varying operational methods in the A-stage, i.e. aerobic or facultative anaerobic operational methods adapted to the sewage water

ingredients

– - process engineering generally without preliminary treatment in order to

maintain better utilization of the microbiological reaction mechanism.



Advantages of AB Process Compared With

Other Process

• Economy:

– Investment savings > 30 %

– Energy savings up to 50 %

– Space reduction up to 50%

• Technology

– Less sensitive to peak loads such as pH, COD, BOD5,

nitrogen, etc. The high-load A-stage receives a 50 to 100 x

higher organic load than a conventional activated sludge

stage.

– Better and more balanced results can be reached with a

multistage process system than with a one stage system.

– A continuously operating system that is constantly

supported and inoculated externally shows a high process

stability.



3. The Sludge Treatment

– Two treatment methods are planned:

• After dewatering by sedimentation in a prethickener to

reduce volume, the thickened sludge can be treated

aerobically or anaerobically.

– Normally aerobic sludge treatment is used for small plants with

small amounts of sludge. Regarding the energy demand in case

of bigger plants with corresponding high amounts of sludge

anaerobic sludge treatment with gas generation in a digester is

recommended. – Organic sludge components are reduced 50% leading to a sludge

mass reduction of up to 35 % after aerobic or unaerobic treatment.

The treated sludge flows into the post-thickening tank, also used

as storage tank with a storage time of more than 10 days.



4. Plant Design4.1 Storage Basin

• The dairy’ s waste water is discharged

discontinuously. Hence incoming water is stored in

an equalizing basin and storage tank. From here the

treatment stages A and B are fed continuously by a

pumping station. The installed stirrers insure mixing

of incoming waste water.

• The storage basin can be operated in the following

ways:

– - Storage of waste water up to 12 hours

– - Pretreatment under anaerobic conditions by addingexcess sludge from A- and B-stage

– - Usage as a flocculation and flotation tank

– - Regulation of pH-value

– - Storage of the process water from sludge treatment



4.2 Adsorption Stage (A-stage)

– The A-stage is a high load biological actived sludge stage with an anoxic-

oxic-tank and intermediate sedimentation tank. The pollutants are adsorbed

to the actived sludge and removed by taking off excess sludge. In addition to

that the effect can be intensified with precipitation dosing.

• 4.2.1 High-loaded-stage (Anoxic-oxic-tank)

– The high-loaded-stage is calculated with contents of MLSS = 2.5 kg m

– On the bottom of the activated sludge basin a fine bubble aeration andoxygen sensor is constructed with membrane plate diffusers.

• 4.2.2 Intermediate Sedimentation

– The intermediate sedimentation tank is a hopper-bottomed-tank without

scraper bridge. The intermediate sedimentation-tank has a low surface load

of less than 1.8 m/h. That insures are very good sedimentation.

– The purified water flows through an outlet trough. The activated sludge

sinks down and is collected in the cone. The return-sludge is conveyed

continuously back into the anoxic-oxic-tank.

– The excess activated sludge of the A-stage is pumped to the prethickening

tank.

4 3 A ti t d Sl d St (B St )



4.3 Activated-Sludge-Stage (B-Stage)

• 4.3.1 Activated-sludge-tank

– The activated-sludge-stage is designed for biological removing of pollutants as

substrate and get nearly mineralised. The tank volume of the activated-sludge-stage therefore is much bigger than the volume of the A-stage.

– The low sludge load ratio is absolutely necessary to avoid bulking sludge and

filamentous bacteria.

– In the activated sludge stage carbon compounds are oxydised completely. The

nitrogen compounds are mostly nitrified to nitrate-nitrogen (NO3-N). To avoiddisturbance by scum the aeration in the low-loaded-stage is switched off from

time to time for denitrification.

– In the activated-sludge-tank a fine bubble membrane aeration and oxygen tube

measuring is installed.

• 4.3.2 Final Sedimentation Tank – The final sedimentation tanks are designed like the intermediate sedimentation

tank.

– Only the return sludge pump is a bigger one. The excess sludge will be

conveyed to the storage tank by opening a valve or by pumping it directly to the

prethickening tank.

4 4 Sl d T t t



4.4 Sludge Treatment

• 4.4.1 Static Dewatering of Excess Sludge (Prethickening Tank)

– The excess sludge of the B-stage is normally pumped to the storage tank

and flows together with the raw waste water into the A-stage.Alternatively it is possible to pump the excess sludge directly into the

prethickening tank.

– After prethickening the DS-content is about 35 kg/m

• 4.4.2 Additional Sludge Treatment

– Sludge Digestion

» Dewatered sludge is conveyed into the digesters. Additionally sludge

inside the digester is recycled from bottom to top and heated by a

heat exchanger up to temperatures of 37C so as to guarantee bestconditions for digestion. The process is monitored by temperature

check and pH-sensor.

– Aerobic Sludge Treatment

» In the tank a fine bubble membrane aeration is installed as well as 2

stirrers to insure circulation while aeration is turned off.



• 4.4.3 Treated Sludge Dewatering and Storage Tank

(Post-Thickening Tank)

– The digested sludge flows directly into the post-thickeningand storage tank. After dewatering by sedimentation the

DS-content is about 40 kg/m

• 4.4.4 Mechanical Thickening

– The mechanical thickening process consists of onecentrifuge including charging pumps and coagulant dosing

station.

– Coagulants for sludge conditioning are supplied dry and

processed with water. The coagulant agents are fed with a

dosing pump into the charging pipe to the dewateringstation.

– The extracted water is recycled into the waste water

storage tank. The dewatered sludge will be stored in

containers and discharged fore agricultural utilization.



4.5 Dosing Plant

• Generally speaking the treatment plant works without any

dosing of chemicals. Temporarily it can be useful to

support biological processes.

• The dosing plant contains an equipment for adding of

– Iron chloride (FeCl3)

– Iron chloride is kept in liquid form and may be added into the

» storage tank ; inlet pipe to the A-Stage ; inlet pipe to the B-

Stage

– Acid:

» Acid is used in small amounts in case of very high pH-valuesin the raw waste water-inlet of the storage tank.

– Flocculates:

» Flocculates support the biological treatment and improve the

sedimentation of activated sludge- storage tank or inlet to the

B-Stage.



• Energy costs are mainly expenditures for electricity

supply.

Costs for additives are minimal due to the characteristics

of the AB-process. Small amounts of acid might be addedtemporarily for the regulation of the pH-value.

Additionally iron compounds or flocculates might be

added from time to time. Occuring costs are minimal and

therefor irrelevant.

Service/Maintenance costs are minimized by the

reduction of mechanical installations. For the plant

operation not more than one or two staff are sufficient.

5. Operation Costs



pos. description WWTP and engine house flat price total

1 excavation 3,925.00 m³

2 subconcrete 1520.00 m²3 filler concrete 150.00 m³

4 concrete for bottom, incl. form work, d = 0.40 m 610.00 m³

5 strip foundation, incl. form work 40.00 m³

6 concrete for walls, incl. form work 950.00 m³

7 roof covering, incl. form work 190.00 m³

8 roof balustrade 38.00 m³

9 gangway incl. balustrade 901.00 m³

10 steel and reinforcement 235.00 to

11 floor covering, d approx. 10 cm 67.10 m³12 industrial coating, floor 671.00 m²

13 structure of roof incl. covering.. 671.00 m²

14 partition walls, h=3.90m 180.00 m²

15 foundation grounding 380.00 m

16 foundations for pumps 8.00 m³

17 expansion joints 100.00 m

18 expansion joints 240.00 m

19 high windows, h=1.00 m, l ca. 65.00 m 65.00 m²

20 outside door, 2.25 x 1.01 4.00 pieces

20 double door, 3.00 x 1.50 1.00 piece

20 double door, 4.00 x 3.50 1.00 piece

20 roll-fronted door, 3.50 x 3.50 1.00 piece

21 interior doors

0.75x2.25 2.00 pieces

0.88x2.25 4.00 pieces

22 wall coating, h = 3.90 m 625.00 m²

amount

Specification for the project of Heilongjiang (civil works)




1 sewage pumps Q = 50 - 70 m³ / h 2.00 pieces

gate valve DN 100 4.00 pieces

backflow trap DN 100 2.00 pieces

emptying nozzle 2'' with ball valve 2.00 pieces

flexible joint assembly DN 100 2.00 pieces

flange couplings DN 100 4.00 pieces

fixed flange DN 100 2.00 pieces

lapped welding flange DN 100 8.00 pieces

flange connection 6.00 pieces

pipeline, DN 100 20.00 m

arc, 90° 6.00 pieces

branch, 100 / 100 2.00 pieces

pressure gauge 2.00 pieces

2 return sludge pump A-stage 30-50m³ /h 1.00 piece

gate valve DN 100 2.00 pieces

backflow trap DN 100 1.00 piece

flexible joint assembly DN 100 2.00 pieces

fixed flange DN 100 2.00 pieces

flange couplings DN 100 1.00 piece

flange connection DN 100 1.00 piece

lapped welding flange DN 100 2.00 pieces

emptying nozzle 2'' with ball valve 1.00 pieces

pressure gauge 1.00 piece

pipeline, DN 100 25.00 m

Arc, 90° DN 100 6.00 piecesreturn sludge pump B-stage 50-100 m³ /h 2.00 pieces

amount

Specification for the project of Heilongjiang (technical equipment)




control cabinet ca. 25.00 pieces

oxygen measurement 3.00 pieces

pH measurement 1.00 piece

temperature measurement 3.00 pieces

pressure measurement 4.00 pieces

level measurement 4.00 pieces

indoor lighting 30.00 pieces

outdoor lighting 20.00 pieces

flow meter, DN 100 3.00 pieces

on-site control incl. outdoor Box 35.00 pieces

pilot and control cable 5,000.00 m

PVC-insulated power cables 4,000.00 m

switches, 220V 30.00 pieces

power point 40.00 pieces

combination power point 10.00 pieces

outdoor terminal box 35.00 piecescommunication center 1.00 piece

fault indicator light and horn hooter 2.00 pieces

cable canal, b = 0.30 m 60.00 m

main wire 10.00 m

automation technology for blowers and pump (SPS) 1.00 psch

visual process guiding system 1.00 piece

heating 170 kW, gas 1.00 piece

amount

Specification for the project of Heilongjiang (electronical tech)



ECI SINOTRUST

Process Flow chart



ECI SINOTRUST

Pipe and Instrumentation Diagram



ECI SINOTRUST

Ground Plan and Section



ECI SINOTRUST

Digester Ground Plan and Section



ECI SINOTRUST

Pre Thickening and Post Thickening Tank

Stand Bid Pres

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