본문으로 바로가기
Product Thumnail Image

6 E&D Global

KITA

Country South Korea South Korea

Supplier Grade level3

Main products Electro-osmosis Dehydrating
Electric Dehydrator

Product Information

Electric Dehydrator Technology Introduction

* Abstract of sludge dewatering technology
Sludge dewatering method is intended to eliminate water from sludge, to enhance operating cost reduction effect and resource values, as well as to reduce transportation cost up to the final disposal and to cause no trouble for land disposal techniques.

* Classification of sludge dewatering technology

a. Filtering dehydration method

01 Method by the drying bed
A method of infiltration drainage into the filter bed and drying on the surface after allowing the sludge flow on to the filter bed where sand or filtering materials have been laid

 

02 Drying Lagoon
A drying method to put sludge in the lagoon for precipitation, to send supernatant back to the disposal facility, and evaporate the sludge of 0.7~1.4m depth

b. Mechanical dewatering method

01 Vacuum dehydrator (Vacuum Filter)
- A dewatering method where the outer circumference of spin drum is covered by filtering cloth, negative pressure(300~600mmHg) in the drum inside is maintained by a vacuum pump, and the drum rotates.

02 Pressing dehydrator (Filter press)
- A dewatering method to pressurize the sludge wrapped by filtering cloth

03 Centrifugal dehydrator (Screw decanter)
- A dewatering method by gravity after receiving centrifugal effect of 1,000~3,000G resulting from rotating movement of solid particles

04 Belt press
- A method to dewater the sludge continuously by one or two moving belt.
- A dewatering method by gravity when the sludge reformed by organic polymer coagulant is injected into the belt press, and by pressure between rollers along the movement of belt.

05 Screw press
- A dewatering method by compressing and extruding the condensed sludge with screw

C. Analysis by the kinds of dehydrators

Item
Our technology
Existing technology
Dewatering
type
Electric
Dewatering
Filter
press
Screw
decanter
Belt
press
Vacuum
filter
Picture
Applied
principle
Electric infiltration
Sludge supply pressure
Centrifugal force
Filter cloth
Decompression filtering
Applied
agent
Not applicable
Polymer coagulant
Polymer coagulant
Polymer coagulant
Polymer coagulant
%of water
content
after
dewatering
below 65wt%
80~70wt%
80~70wt%
80~70wt%
80~70wt%
Operating
cost
Electricity cost
Added electricity cost of high pressure dewatering part
Less power consumption ratio
Added electricity cost of high pressure dewatering part
big energy consumption
Service
pressure
Simple compression except for power supply
15kg/cm2
1500~3000G
10~20kg/m3/hr
10~25kg/m3/hr
Incidental
facilities
Steam removal facility
Reaction facility
Drug facility
Cleaning facility
Cleaning facility
Soundproof facility
Dedusting facility
Reaction facility
Drug facility
Agitating device in Vat
Cleaning device
Dewatered cake discharge conveyor
Sludge
supply
method
Continuous
Intermittent
Continuous
Continuous
Continuous
Applicability
against
sludge
behavior
change
Good
Good
Bad
Good
Ordinary
Others
Disposal efficiency varies with the quantity of power supply
Continuous work is difficult due to Batch type operation
Solid recovery is small.
Issue of high rotation
Drug injection is required.
Intoxication
Many incidental facilities

Principles and advantage of electric dewatering technology

Definition of Sludge

Sludge is called Oh-Nee in Chinese language.
Sludge in the dictionary means a solid substance settled down from the floating matters when sewage is precipitated in water tank or reservoir.
Diverse sludges are obtained during several stages of sewage treatment process. That is, at the first stage chemically settled sludge is obtained, then sludge activated by a drip filter is obtained, and retted sludge is obtained. Some sludge is sent to the ocean after treated with the underwater dumping method or water pumping method, some is sold as a fertilizer after being dried, and some is retted after anaerobic treatment in the water reserver like an imhoff tank or precipitation tank with microbes to reduce organic components. During the retting process, as its volume decreases, and residues are comparatively harmless, characterized of humus soil, it is filled in the land. When we see the definition of "Wastes" in Article 2, Waste Management Law, they are garbages, burnt matters, Oh-Nee, waste oil, waste acid, waste alkaline, animal corpses, and substances not required further for human life or business activity. Oh-Nee is included here in the category of waste, but the definition is not stated as a separate title and dispersed in several titles.
To explain more easily, a mixture of solid foreign materials(microbes, etc.) input or created during the purification process of fine solids (dust, etc.) mixed in sewage and waste water - 98% of water content concentrated or condensed during the purification process - is called slurry. First-dewatered slurry, 80% of water content, is called cake sludge.

Sludge production details

Sewage and wastewater include fine solids (dust, etc.) mixed during the use of water and microbic solid foreign materials input or created during the purification process. At the final stage of sewage and wastewater purification process, used is a method to separate from water the foreign materials by condensing them only normally with the input of chemicals of polymer
This condensed state is called 'Slurry'. a limp shape of 98% of water content in general (98% water, 2% solids)
This slurry is discharged separately and goes through dewatering process. Most dehydrating equipment currently installed at the sewage and wastewater treatment plant are 'belt press dewaterers' or centrifugal separation dewaterers'. A lump of final foreign materials through such dehydration process is called 'Sludge', which is normally 80% of water content (80% water, 20% solids) characteristic of watering out when holding it in the hand and pressing it.
Currently the technology of dehydration below 80% in average of water content in sludge does not exist all over the world. The reason is that we cannot draw internal water in the microbic cytoplasm, a major constituent of sludge.

Technical principle of the electric dehydrator

  • To utilize "electroosmosis", one of electric inherent properties, and to utilize incidentally electro-phoresis", and "Brown motion".
  • To utilize the power supply method using voltage difference, to break sludge cell membranes, and thus to discharge water in the cell

Sludge cell breaking process by electric dehydration

slurry to 70%. We contribute to sludge fuel energy business by further evolving the technology which reduces 80% cake first dehydrated to 60%.

At present our technology is introduced to domestic sewage and wastewater treatment plant and private companies for cost reduction and corporate image enhancement for improving environment. Our company is leaping toward a global environment enterprise through interchange, collaboration, and export with companies in Europe, China, USA, and Asian countries.

We are performing a leading role in true-to-the-name electric dewatering technology by securing stability, efficiency, and technique of electric dehydrators, after overcoming previous problems by rich site application experiences

Sludge treatment process of the electric dehydrator

Product specification of the electric dehydrator

Item
Contents
Kind of product
Complex type electric dehydrator
(EDG-C2400)
Standard type electric dehydrator
(EDG-S2400)
Product
picture
Dewatered
object
slurry(over 98% of water content)
sludge cake(around 80% of water content)
%of water content
after dehydration
65~70%
60±3%
Optional
specification
Replacement for the existing dehydrator
Replacement for the new dehydrator
Secondary dehydration at the rear part of the existing dehydrator
Belt width
(mm)
2,460
2,460
Treated
amount
(ton/hr)
8~10ton
(based on 98~98% slurry)
1ton
(based on 80% sludge cake)
Power
consumption
(kwh)
150
150
Size
(LxWxH)
3510x3424x3430
3354x3510x3204
Scope of
supply
Console, VAR system
Console, VAR system
Input principle
Transport slurry and coagulant through pipe with a motor, agitate in the agitator, put the slurry into the input device with a slurry head (windmill type) Put into the sludge supply device, the sludge discharged from the first dehydrator and stored in the hopper, and supply it to the dehydrator in the fixed quantity in accordance with the sludge characteristics.

Drawing of the electric dehydrator

a. Drawing of complex type electric dehydrator(EDG-C2400)

b. Drawing of standard type electric dehydrator(EDG-S2400)

List of required power

Item
Model
Specification
Q'ty
Required
power(kw)
Manufacture
Required
power
Complex type electric dehydrator
150Kw/3Ø/380V
1
146
E&D
Global
Standard type electric dehydrator
150Kw/3Ø/380V
1
146
Ordinary
power
required
Main driver
1.5Kw/3Ø/220/380V
1
1.5
Samyang
Reduction
Gear
Drum cleanser
0.4Kw/3Ø/220/380V
1
0.4
Filter cloth cleaner
0.4Kw/3Ø/220/380V
1
0.4
Supply of fixed amount of sludge
0.4Kw/3Ø/220/380V
1
1.2
Console
0.4Kw/3Ø/220/380V
1
0.4
Vendor
Others
-
 
0.1
-
Total
     
150
 

Consumable details

No.
Product Name
Q'ty
Material
Time
1
Drum
1set
Titanium
7,500
2
Filter cloth
1set
DM-101
4,000
3
Discharge scraper
1set
MC NYLOM
4,000
4
Drum brush
1set
PP
4,000
5
Filter cloth belt brush
1set
PP
4,000
6
Surge belt of the fixed quantity supply device
1set
PVC
5,000
7
Power supply device(brush)
1set
Carbone(>80%)
8,000
8
Mechanical valve
1set
PMSV2406-VA-02
4,000
9
Electric valve
1set
Electric type/Screw type
4,000
10
Limit switch
1set
AC220V
1,000
11
Fixed quantiy supply leveller
1set
HILV-100
4,000
12
Bearing
1set
UV bearing
2,500
13
Cylinder
1set
GDC80-100
1,000km

* This period table may be changed according to the site conditions and user's management.
* Replacement is requested after checking the state of consumables.

Maintenance cost calculation and details

Design criteria of hydrator [Operating condition of the standard type hydrator: 8 hours]

[Design capacity based on 8~10ton/day] [based on 80% of water content]

Item
Design
capacity
Input %of
water content
%of water
content in
discharge
Operating
hour
Treated
quantity
Sludge cake
8~10ton/day
80%
60±3%
8~10hr
0.8~1ton

Design criteria → Operating hour for one dehydrator is 8~10hr
For the operation of 8~10 hours/day, one dehydrator should be installed.

Maintenance cost

Calculation conditions

01 Electricity cost

[Power consumption calculation]

Construction
type
Equipment
name
Power
(kw)
Quantity(set)
Service
operation
hour(hr)
Applied load
(kw.h.day)
Service
Total
Sludge
dewatering
facility
Electric
dehydrator
150
1
1
8
1,200

* Calculation basis of electricity cost
ㆍ Operating condition - dehydrator 1 set (8~10hr/day)
ㆍ Design specification - Power consumption 150kw/set
ㆍ Charge
- Basic rate 150kw x 1(set) x W6,970 = W1,045,500
- Electricity rate used 150kw x 1(set) x 8(hr/day) x W77.18= W92,616
* 2010. 08. 01. Increase of electricity rate (about 17% increase compared with that in 2008)
* Basic rate W6,970/Kw(Monthly)
* Unit rate W77.18/Kwh(average per season) Unit rate in 2008 W62.55/Kwh
* Unit rate reduced by 16% for 24 hours operation (reduction in case of night use)

02 Water capacity

Construction
type
Equipment
name
Used
amount
(m3)
Quantity(set)
Service
operation
hour(hr)
Applied
quanity
(m3/day)
Service
Total
Sludge
dewatering
facility
Standard type electric dehydrator
(EDG-S2400)
1
1
1
8
8

* Calculation basis of water capacity - Used amount(m3) x 1(set) x 8(operating hour per day) = 8m3/day

03 Consumables and repair/maintenance costs

* Consumable costs : calculation of consumable costs
- Main consumables: Drum re-coating costs of the electric dehydrating device (W25mil./year/set)
→ Drum re-coating cost = W25,000,000/year

* Repair cost : Replacements of tools and material like filters, replaced quantity, and relevant costs
- General consumable costs : 0.5% of mechanical device costs:W2,500,000/year

Calculation details of operation cost per ton

Item
Unit price
applied
Amount per
day
Yearly
consumption
cost
Remarks
Electricity
cost
Contract power (150Kw)
W6,970/kw
1,045,500
12,546,000
 
Electricity used
77.18/kwh
92,616
30,563,280
 
Total
   
43,109,280
 
Water cost
Used water
W917/m3
8
2,420,880
 
Fuel cost
Not applicable
-
-
-
 
Consumable cost
Drum re-coating cost
25,000,000
 
8,800,000
Yearly 1set
(Replacement period: 7500 hrs)
Repair/
maintenance
cost
0.5% of mechanical
equipment cost
2,500,000
 
2,500,000
 
Labor cost
Operator
24,000,000
 
48,000,000
2 persons
Total
     
104,830,160
 
Operating cost per ton
(80% → 60% of water content)
W39,708/ton

*Excluding civil work and other utility costs

Economy of the electric dehydrator

Our dewatering technology uses electroosmosis and electrophoresis instead of physical force, allowing up to 60% of water content as it destruct sludge particles with electric action and dehydrate internal water. As dewatered sludge loses its intrinsic property and non-dry section, the following dry method can be simple and the cost will greatly be reduced for advantage. Besides, compared with existing technologies, its facility and operating costs can be reduced down to 1/2. It, as a realistic and core technology, can also be applied to pre-treatment technology to any sludge land treatment techniques

Comparison of economic feasibility for the electric dehydrator (10 ton, 80% sludge cake per day)

Item
Unit
Comparison before/after dehydration
Before
hydration
(82%)
After
dehydration
(60%)
After
dehydration
(50%)
Sludge production
ton/day
10
4.5
3.6
Water reduction rate
%/day
-
55.0
64.0
Power consumption
kwh/ton
 
130
135
Electric cost
Unit
cost
W/Kwh
 
80
80
 
Calculation
W/day
 
104,000
108,000
Sludge
transportation
cost
Unit
cost
W/ton
20,000
20,000
20,000
 
Calculation
W/day
200,000
90,000
72,000
Sludge
disposal cost
Unit
cost
W/ton
60,000
60,000
60,000
 
Calculation
W/day
600,000
270,000
216,000

Economic feasibility analysis of electric dehydrator and dry system(10ton/day, 82→60% dry)

Item
Electric dehydrator
Dryer system
In case of useing LNG
W900/m3
In case of using kerosene
W1,500/L
Yearly
energy cost
150Kwh x 10ton x 365day x W80/Kwh
=W43,800,000
45m3 x 10ton x 365day x W900/m3
=W147,825,000
55L x 10ton x 365day x W1,500/L
=W301,125,000
Image
Company

E&D Global

Country South Korea South Korea

Supplier Grade level3

President
Kwangsun Park
Address
5F Shinhan building, 1294-18 Chipyeong-dong, Seo-gu, Gwangju, Korea
Product Category
Waste Management
No. of Total Employees
1-50
Company introduction

E&D Global was founded in 2012 as a global environmental company under the banner of green growth, the fundamental topic for human life. We have developed and completed new technologies for sludge reduction and succeeded in commercialization through our endless technical development and intense field experiences. Everyday we dump more than 10,000ton of sludge at sea, which causes marine environment pollutions that is on the rise as a serious problem at government level. Therefore, the government has prohibited a dumping of sludge at sea since 2012 and each of the local governments are considering alternatives for overland disposal of sludge. E&D Global has succeeded in solving all of these problems by a long technical development and great expense. 'Electro-osmosis Dehydrating' and 'Low-temperature Ventilation and Drying', both technologies completed by us, are the green original technology true to the name and will provide the best value. E&D Global promises to go with you as a global leading company for environment through commercialization of sludge disposal. Thank you.

Other Products from This Supplier