Lavender Fecal Technical Plan for Wastewater Treatment

Technical Plan for the Fecal Waste and Fecal

Wastewater Treatment Project

Nanjing Wonders Environmental Protection Technology Co., Ltd.

July 2012

Technical Plan for the Fecal Waste and Fecal Wastewater Treatment Project

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Part I Fecal waste treatment system...........................................................................................1

Chapter 1 Project Overview........................................................................................................2

1. Design basis..........................................................................................................................2

2. Design scope.........................................................................................................................2

3. Design capacity ....................................................................................................................2

Chapter 2 Fecal waste treatment process...................................................................................3

1. Fecal waste treatment process............................................................................................3

2. Descriptions for the main facilities of fecal waste treatment ...........................................5

Chapter 3 Main equipment list for the fecal waste treatment system .....................................9

Part II Fecal Wastewater Treatment System ...........................................................................13

Chapter 1 Project Overview...................................................................................................14

1. Design basis........................................................................................................................14

2. Design scope.......................................................................................................................14

3. Design capacity ..................................................................................................................14

Chapter 2 Wastewater treatment process ................................................................................16

1. Wastewater treatment process .........................................................................................16

2. Process flow chart .............................................................................................................20

3. Descriptions for the main structures ...............................................................................22


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Part I Fecal waste treatment system


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Chapter 1 Project Overview

1. Design basis

Relevant norms, regulations of PRC Field survey data attained by our technical personnel Relevant information provided by the owner.

2. Design scope

This design includes the preparation of fecal treatment system technology,

construction, installation and other associated works, as well as the completion of

engineering design, equipment and materials procurement, installation and

commissioning guide services, aiming at integrating the design, procurement, and

installation in a way of reasonable cross-phase and close integration.

3. Design capacity

According to the on-site presentations of the local government officials and field

survey of our technical staff, ACCRA city averagely dumped approximately 12002000m3/d feces from LAVENDAR every day to the Atlantic Ocean. Taking the

long-term reservation into account, we set the fecal waste treatment capacity as

2000m3/d in this design.


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Chapter 2 Fecal waste treatment process

1. Fecal waste treatment process The fecal waste of schools, hotels, public toilets, etc. was collected by suction

truck point-by-point, then transported to the proposed fecal waste treatment system. In

the pretreatment unit, through the unloading septic tank, coarse grid and sand

removing integration device, larger objects like plastic bags and rubbles were

separated out of the fecal waste and transported to the landfill. The rest wastewater

then was flocculated and dewatered to separate the fecal slag and the liquid, the fecal

slag then was composted or landfilled, the liquid flowed into the wastewater treatment

system, after deep treatment then discharged into natural water body.


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odour gas

off-site transport packing

press dewatering of sand materials and slag

Cleaning of stones and other materials

press dewatering of large fiber materials

Fecal waste suction truck

deodorization system Emissions to the atmosphere

Dewatering unit

Landfill, agricultural composting

Polymer flocculation

Filtered liquid discharged into the wastewater treatment system

fecal waste storage and mixing device

sludge

Unloading septic tank

Coarse grid Fine grid / Desanding integration device


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2. Descriptions for the main facilities of fecal waste

treatment

2.1Unloading port docking device Fuction: Install the docking device at

the unloading port to achieve closed docking

with the fecalwaste transport vehicles (feces

suction trucks) for the fecal waste treatment

plants to unloading of fecal waste, and to

reduce environmental pollution.

2.2Unloading septic tank and coarse grid As many uncertain factors of the

manure collection and transportation will

affect the feed changes per unit of time, an

unloading septic tanks should be set to

ensure continuous operation of fecal waste

pre-treatment devices and avoid the feces

suction trucks waiting to unload. To assure

the smooth functioning of the follow-up

devices and improve the efficiency of the core devices, a coarse grid will be installed

after the unloading septic tanks to pre-separate the larger stones and bulky waste

materials like fiber and hygiene products, etc.

2.3Solid liquid separator


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Equipment description Mainly used for filtration processing of fecal waste slurry. The entire device is

composed of a squeezing functional fine grid/filtering device, a sand catching box and

a sand-water separator screw, mounted together on the inside of a stainless steel box.

When the fecal waste slurry flows through the fin grid / grid net, most of the

solid impurities are separated out as slag into the slag press dewatering device to

reach a significant volume reduction, then unloaded into the slag box.

All above processing is carried out in a closed system, no odour leaks. After

washing treatment, rinse water containing organic matter flows back to the box, and

slag becomes clean and odorless.

Equipment operation After coarse grid the fecal waste slurry flow in to the receiving box, , when the

water level reached the certain height, the fine grid would automatically be in

operation, grit boxes and sand screw operated as well.

After the grid the non biodegradable slag was separated out, pressed and

dewatered, then discharged. The fecal waste was returned to the water channel after

rinsed.

The whole control system is a fully automatic operating system.

2.4Shaftless screw conveyor The structure of the screw conveyor is the shaftless spiral, the screw blade is

drawn from stainless steel, it is designed to ensure the material flow smoothly without


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jam. The screw conveyor is responsible for the filter slag conveying of the integrated

separation device. There is a matching receiving box to the device, and the Spiral

groove was sealed. The wear strips or lining was set inside the Spiral groove with life

expectancy of not less than 2 years. The driving device and the screw blade is

straightly connected without coupling. No oil seepage in all the sealed joint surface of

the driving device, with overload protection feature and protective cover.

2.5Regulating tank In order to ensure continuous and stable operation of the follow-up fecal slurry

dewatering device, a regulating tank needs to be built. The tank volume is relevant to

the daily processing fecal waste water volume and dilution and flushing water volume.

In this design, we temporarily set the regulating tank volume as 1200m3, underground

reinforced concrete, and mounted with stirring device in the tank to avoid the fecal

slurry surface hardening.

2.6Dewatering machine

Horizontal screw pressing dewatering device we choose is a mechanical, low

speed, full closed, continuous operation new dewatering unit. Fecal waste slurry from the regulating tank mixed with the flocculants, then

injected into the flocculation reactor of this dewatering system. This dewatering

system is equipped with an automatic preparation apparatus and dosing device for the

powder or liquid flocculants. After flocculation reaction the slurry forms into flocs


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and folws into sludge ascension and press chamber. With changes of the pressure, the

slurry will be gradually ascended and increasingly dry to achieve the effect of

dewatering. To avoid the jam of the stainless steel filter inside the press chamber, jet

cleaning device will be programmed to execute automatic cleaning, without affecting

the mechanical dewatering effect.


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Chapter 3 Main equipment list for the fecal waste

treatment system

No. Equipment Name Specifications Model Quantity Remarks

1 Solid-liquid separation system

1.1 Unloading fecal waste docking device

DN150

10set

Including rubber supporting supporting hose, and the interface

1.2 Sluice gate LxH=500x500mm 4set

1.3 Coarse grid BxH=400x2000mme=40mm

4set

1.4 Screw press LYZ 2set

1.5 Shaftless screw conveyer

WLS260 2set Supporting 1.4

1.6 Integrated solid-liquid

ti hi

Q=100m3/h 4set


WLS260 4set Supporting 1.6

1.8 sewage pump Q=100m3/h 3 set 1 spare

1.9 Submersible mixer D260 4 set

1.10 Submersible sewage pump

Q=100m3/h 4 set 3 use 1 spare

1.11 System supporting pipe, pipe fittings

1set


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1.12 System supporting wires, cables

1set

1.13 System supporting valves

1set

2 Flocculating and dewatering system

2.1

Automatic three-chamber flocculation fluid preparing device

3000L/h 2set

2.2 Dosing pump Q=0.11-2m3/h 12 set 2 spare

2.3 Feeding electromagnetic flowmeter

DN80 10 set

2.4 Flocculation liquid flowmeter

DN25 10 set

2.5 Pipeline mixing device

10 set

2.6 Dewatering machine Q=10-15m3/h 10 set

2.7 Sludge bucket V=2m3 2 set

2.8 Rinse tank V=8m3 1 set

2.9 Pressure pump Q=25m3/hH=50m 3 set 2 using 1 prepared


WLS260 2 set set2.6


1set

2.12 System supporting pipe,

1set


1set


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2.14 Liquid level meter 3 set

3 Deodorization system

1set

3.1 Deodorization tower 1set

3.2 Air blower Q=10000m3/h 3 set 2 using 1 prepared

3.3 Water circulating pump

Q=10m3/hH=10m 4 set

3.4 Sprinkler system Special nozzle 1set

3.5 Filling bracket FRP 1set

3.6 Biological filter material

Organic Filter 1set

3.7 Chimney 800mm, h=15m 1 set

3.8 System supporting pipeline

1set


1set


1set

4 Monitoring system 1set

4.1 HD camera 8 set

4.2 Camera adapter And 4.1 supporting

1 set

4.3 Camera bracket And 4.1 supporting

8 set

4.4 Video monitor 22 inches 1 set

4.5 Hard disk video recorder

16 channels 1 set

4.6 Video cable, power line,signal 1set


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4.7 Monitoring equipment working table

1set

5 Central control system 1set

5.1 Industrial Personal Computer-IPC

CPU3.0GHZ 1 set

5.2 IPC Interface 1set

5.3 IPC cable 1set

5.4 Control cabinet 1 set

5.5 Power Distribution Cabinet

1 lot

5.6 PLC system With DI, and DO, AI, AO, and other modules

1set

5.7 System Software

5.8 IPC monitor 22 inches 1set

6 Miscellaneous

6.1 Electric Hoist CD 2set

6.2 Systems supporting valves

DN15~200 1 lot

6.3 Systems supporting pipes, pipe fittings

DN15~200 1 lot

6.4 Systems linking cables

7 System installation costs

8 System commissioning costs


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Part II Fecal Wastewater Treatment System


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Chapter 1 Project Overview

1. Design basis Relevant norms, regulations of PRC Field survey data attained by our technical personnel.

2. Design scope This design includes the preparation of fecal wastewater treatment system

technology, construction, installation and other associated works, as well as the

completion of engineering design, equipment and materials procurement, installation

and commissioning guide services, aiming at integrating the design, procurement, and

installation in a way of reasonable cross-phase and close integration.

3. Design capacity

3.1Design capacity According to the relevant information provided by the owner and field survey of

our technical staff, ACCRA city averagely dumped approximately 1200-2000m3/d

feces from LAVENDER every day to the Atlantic Ocean. In order to improve the local

government image, and to improve the pollution status of the coastline of Ghana, the

local government has determined to launch a fecal waste and wastewater treatment

plant to reverse the pollution of the coastline.

Considering of the long-term reservation and less one-off project investment,

we propose that the total treatment capacity should be set as: 2400m/d

3.2Design of influent and effluent quality According to the information provided by the buyers, combined with our

engineering experience in similar projects, fecal wastewater influent COD is about

12000 mg/L.

Reference to the second grade discharge standards for other sewerage industry in

the Table 2 of Integrated Wastewater Discharge Standard of People's Republic of


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China "(GB 8978-1996), combined with specific local conditions, this design

identified that after the treatment, the effluent COD is less than 250mg/L, BOD is less

than 30mg/L, SS is less than 300mg/L.


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Chapter 2 Wastewater treatment process

1. Wastewater treatment process In view of the high concentrations of COD, high ammonia nitrogen

concentration and the high effluent quality requirements, this design proposes to use

biochemical treatment technology route mainly consist of UASB+ A/O processes.

1.1Up flow Anaerobic Sludge Blanket (UASB) Reactor

Newly built Outline Internal facilities

Wastewater flowes through UASB from bottom to top, there is a sludge bed with

high concentration and high activities. Most of the organic pollutants in the

wastewater are degraded to methane and carbon dioxide through anaerobic

fermentation here. Due to the agitation of the water and bubbles, there is a sludge

suspension layer above the sludge bed.

A three-phase separator is set at the top of the reactor for the separation of the

digestion gas, digestion liquid, and sludge particles. the digestion gas is vented out

from the top, sludge particles automatically fall into sludge bed at the bottom of the

reactor and digestion liquid flow out from the purification zone.

UASB load capacity is very applicable to the processing of the high

concentration organic wastewater. A well operated UASB has high removal ratio of

organic pollutants, no need of stirring, and can adapt to the substantial impact of load,

temperature and pH changes. Through water sealed tank, and after the sulfur removal


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and moisture removal, the biogas generated from the UASB will be supplied to the

biogas generator sets, with daily gas output of 6900m, it is expected to generated

power of 10000kw.h.

1.2Anoxic /Oxidation process Activated sludge method is a widely used aerobic biological wastewater

treatment technology; the processing system has been fully mature after decades of

development and innovation. Activated sludge process uses the microbial community

of a variety of bacterial and protozoan to adsorb and metabolism the organic

contaminantsand completely decompose the contaminants into CO2 and H2O. The activated sludge process makes the adsorption and metabolism of pollutants progress

going smoothly by using the free-state microorganisms adequately mixing with the

wastewater

The activated sludge process is a biological wastewater treatment method using

activated sludge as the main body.The activated sludge is a sludge-like flocs,

which is formed due to aerobic microbial proliferation when blowing the air into the

wastewater continuously, for a certain period of time. The floc-based

microorganisms living in the activated sludge have a strong adsorption and oxidation

of organic matter. Under artificial aeration conditions, continuous mixed culture a

variety of microbial communities can form the activated sludge. Using the biological

cohesion, adsorption and oxidation of the activated sludge to decompose the organic

contaminants in the wastewater, then separate the sludge and the water, most of the

activated sludge returned back to the aeration tank, and excess sludge was

discharged.

Considering the ammonia and total nitrogen removal, we propose the anoxic and

aerobic combination process. The ctivated sludge contains a lot of nitrifying bacteria

in the aerobic segment, and also the suspended sludge contains a lot of nitrifying

bacteria, which can carry on the nitrification

NH41.382O21.982HCO3


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0.982NO20.018C5H7O2N1.036H2O1.891H2CO3

NO20.003NH40.01H2CO30.003HCO30.488O2 0.003C5H7O2NNO3

In the anoxic zone due to the presence of large amounts of facultative

denitrifying bacteria, denitrifying reaction are as follows:

NO3[H] NO2H2O

NO2[H] N2H2O This makes the whole system has higher nitrogen removal effect.


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1.3Sludge treatment system Sludge tank is used to collect sedimentation tank sludge, the sludge collected

water was 99.3 percent. Followed by the sludge pumped to the belt filter press for

sludge thickening process, prolapse of the mud filter cake Sinotrans landfill, the

supernatant discharge to the sewage regulation pool, for recycling.

1.4Control system Equipped with on-line instrument as flow and liquid level, the control system is

controlled by central control system, which sends operation command to pump,

guides the equipment running speed or other status, to achieve automatic operating,

according to the signal feedbacked from flowmeter and level gauge.


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2. Process flow chart Based on the analysis of the water quality and quantity, this project is suitable for

biochemical treatment methods. We propose the main process flow as UASB+A/O

oxidation tank + sedimentation. The biogas generated in UASB was utilized for power

generation.


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A sectionanoxic tank

Disinfection tank

O section the oxidation tank

UASBAnaerobic Reaction Tower

Secondary sedimentation

tank

Sludge storage tank

Sludge dewatering machine

Regulating tank

Feacal waste water

meet up the standards and

discharge

Return sludge Internal circulation

Sludge outlet

Desulfurization device

Biogas

Moisture removal device

Biogas generator

Electrical equipment


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3. Descriptions for the main structures

3.1Regulating tank 1 structure

Function: The regulating tank is to balance water quality, regulate water flow, keep the follow-up treatment structure from the impact of peak water quantity and quality changes.

Dimensions: LBH=30156m Type: underground reinforced concrete Quantity: 1 HRT: 20h

3.2UASB Anaerobic Reaction Tower 1structure Function: Main pollutants degradation unit, most of the organic pollutants

in water degraded to methane and carbon dioxide through anaerobic fermentation here.

Dimensions: H= 1012m Type: anticorrosion steel Quantity: 4 HRT: 48h

3.3A section Anoxic tank 1structure Function: to remove Ammonia by denitrification, consume part of carbon

organic matter(BOD5), reduce the organic load of the aerobic tank,and improve the settling properties of activated sludge, and facilitate control of sludge


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bulking Dimensions: LBH=2086m Type: semi-underground reinforced concrete Quantity: 2sets HRT: 17.5h

3.4O section the oxidation tank 1structure Function: in this unit, aerobic microorganisms decomposite the

carbon-containing organic matter (BOD5), and organic nitrogen is turned into nitrification nitrogen by ammonification and nitrification.

Dimensions: LBH=24206m Type: semi-underground reinforced concrete Quantity: 2sets HRT: 48h

3.5Secondary sedimentation tank 1structure

Function: to separate the sludge, purify the water and thicken the sludge Dimensions: H =96m Type: semi-underground reinforced concrete Quantity: 2 Key parametersurface load: 0.78m/h

3.6Disinfection tank 1structure


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Function: to kill the pathogenic micro-organisms in the treated wastewater Dimensions: LBH=842m Type: semi-underground reinforced concrete Quantity: 1 HRT: 0.5h

3.7Sludge thickening tank 1structure Function: sludge storage Dimensions: H =116m Type: semi-underground reinforced concrete Quantity: 1


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4. Main structures list Main structures list

No. Name Dimentions Quantity structure remarks

1 Regulating tank

30156 1 Underground

reinforced concrete

2 Anaerobic Tower for Upflow

Anaerobic Sludge Blanket(UASB)

1114 4 anticorrosion

steel

3

A section anoxic tank

2086 2 Semi-underg

round reinforced concrete

4 O section the oxidation tank 24206 2 5 secondary sedimentation tank 96 2 6 Disinfection tank 842 1 7 Sludge storage tank 116 1 8 Comprehensive workshop 604m2 brick

5. Main equipments list

Main equipments list

No. Name specifications unit quantity remarks

one Process equipment

1 Regulating tank

1.1 Integrated wastewater lift pump Q=60m3/h,H=2

0m set

3


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1.2 Flowmeter 0100 m3/h set 4

1.3 On line pH meter 014 set 1

1.4 Thermometer 0100 set 1

1.5 Liquid level meter 010m set 1

1.6 Mixing system set 1

1.7 sealing systems

set 1

2 UASB anaerobic reaction

tower

2.1 UASB anaerobic reaction

tower 1114m set 4 Steel anti-corrosion

2.2 Water seal vessle

10001500mm set 4 Steel anti-corrosion

2.3 Water distributor DN50100 set 4 Stainless steel 2.4 Water collector DN50100 set 4 Stainless steel 2.5 Three-phase separator set 4

2.6 Circulation pump Q=75m3/h,H=25m set 8

4 using 4spare

2.7 Flowmeter 0200 m3/h set 4

2.8 Effluent weir set 4

3 A section anoxic tank

3.1 Submersible mixer 1.5KW set 4

4 O section the oxidation tank

4.1 Mixed liquid recirculation

pump Q=75m3/h set

4 2 using 2 spare

4.2 Microporous aerator 260 set 2000


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4.3 Roots blower Q= 45m3/min set 3 2 using 1 spare

5 secondary sedimentation

tank

5.1 Water distribution device

set 2

5.2 Water collection device

set 2

5.3 Sludge scraper 9000mm set 2

5.4 wastewater recirculation

pump Q=50m3/h set 4 2 suing 2 spare

6 Disinfection tank

6.1 UV disinfection lamp

lot 1

7 Sludge storage tank

7.1 wastewater pump Q=15m3/h set 2 1 using 1 spare 7.2 Sludge thickener 10000mm set 1

8 Comprehensive workshop

8.1 sludge dewatering machine H=1.50m set

1

8.2 Air compressor set 1

8.3 Cleaning pump set 1

8.4 Flocculant dosing device 200L/h set 1

8.5 Flocculant aid dosing device 150L/h set 1

two Pipeline valves 1 1 System piping


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1.1 Steel pipe DN32300 lot 1

1.2 Stainless steel pipe DN50300 lot 1

1.3 PVC pipe DN20300 lot 1 1.4 Steel wire hose DN50100 lot 1

2 System pipe fittings

2.1 Flange DN32300 lot 1 2.2 Elbow DN32300 lot 1

2.3 Three direct links DN32300 lot 1

2.4 Diameter pipe DN32300 lot 1 2.5 Head DN32300 lot 1 3 System valve 3.1 Butterfly valve DN32300 lot 1 3.2 Ball valve DN32300 lot 1 3.3 Gate valve DN32300 lot 1 3.4 Check Valve DN32300 lot 1 three Electrical system

1

1 Power distribution components lot 1

2 Lighting, power distribution components lot

1

3 Cable lot 1 4 Bridge lot 1

four Control instruments 1

1 Control system set 1 1.1 Control cabinet set 1


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1.2 Lighting distribution panel set 1

five Installation engineering

1 Pipe welding, bonding set lot

1

2 Positioning of equipment, pipe rack production set lot

1

3 Cable laying set lot 1 six Commissioning set seven Anticorrosion Engineering lot 1

Lavender Fecal Technical Plan for Wastewater Treatment

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