IPH Waste Water Pres 2010 Print

8/12/2019 IPH Waste Water Pres 2010 Print

1/14

The Clear Solution

IPH GmbH

Pretschgasser 12

1110 Wien Austria

[email protected]

I www.environment-waste.com


2/14

Waste Water Treatment | 2

We offer worldwide services in regard to technologies,

design, engineering and construction of plants for the

treatment of municipal-, industrial- and agricultural

wastewaters, as well as the dewatering and thermal

recycling of sludge.

Providing State-of-theArt

Technologies to turn Waste

into Valuable Products ...

Whenever applicable, waste heat and/or gravitation are used as energy source, in order to avoid the usage of primary energy.


3/14


Quick Sedimentation Unit

The Quick Sedimentation Unitis the central part of

an alternative sewage treatment plant, which can be

implemented in municipal-, industrial- and agricultural-

wastewater treatment plants. This unit replaces thegrid channel and pre-treatment (large primary treat-

ment clariers) of conventional wastewater treatment

plants. From the entering wastewater solids are sepa-

rated up to 50 times faster compared to the conventi-

onal approach.

The water enters the Quick Sedimentation Unit with

high speed, attaining a nearly complete solid-liquid

separation by means of hydraulic processes and iner-

tia. The cleaned water leaves the tank via a ring lter.

This device was awarded with the R.I.O. innovation price.

Z Sedimentation in ow direction, not counter wise

Z 20-50 times higher sedimentation speed in com-

parison to conventional systems

Z The result: enormous energy and space savings

with tremendous results regarding immediate drop

of BOD5 and COD levels

Separation of

solids from

fluids


4/14


Pre-dewatering cylinder

Function

The sludge enters the cylinder from the

bottom. On its way organic polymer occu-lent is added and mixed into the sludge by a

slowly rotating paddle mixer which moves the

sludge upward. The upper part of the cylinder

is formed as a screen lter, from where the

main quantity of the ltrate water drops out of

the cylinder onto a slide.

Capacity and reachable level of sludge dehydration

The capacity of one cylinder is approx. 600

kg dry substance per hour, which corre-

sponds to 15 m sludge with 4% DS per

hour. For municipal digested sewage sludge

approx. 8-14% DS can be reached. The pre-

dewatering cylinder is very suitable for the

thickening of thin sludge with a DS

of > 0.5 %.

Sludge

dewatering


5/14


Pre-thickening cylinder

Function

The pre-thickening cylinder serves for an additional

gravitational thickening of the pre-dewatered sludge.

The pre-dewatering cylinder and pre-thickening cylin-der are connected by a slide. Inside of the cylinder the

sludge moves in a slowly downward motion where-

by it dewaters through an additional screen lter. To

increase dewatering efciency a slowly rotating coil

moves the sludge from the core to the peripheral

of the cylinder. The sludge leaves the cylinder via a

discharging device on the base of the cylinder. The

lter is periodically washed by a lter washing unit.

Capacity and reachable level of sludge dehydration

Approx. 600 kg dry substance per hour. Obtainable

degree of desiccation for municipal digested sewage

sludge is approx. 28% DS!

Advantages of the system

Due to the highly efcient pre-dewatering, the follow-

ing belt press can be operated with higher pressure.

Consequently sludge will be dewatered faster and

to a higher degree. Furthermore the efcient pre-

dewatering allows treatment of a quite high amount of

sludge (10-15 m/h) at a small belt press with a belt

size of just 1.0 meter. For municipal digested sludge

approx. 30% DS can be reached.

Belt press

The compact belt press serves for the dewatering of

large quantities of sludge ranging from 0.5 % DS - 30-

35% DS. It can be prearranged either as stationary or

as mobile unit (container). It is equipped with a sludge

pump, occulent preparation unit, dosage unit and all

necessary controls.

It equally processes municipal and industrial sludge.

The very efcient pre-dewatering does not only sur-

pass a wider belt, but also allows a pressing under

higher pressure with less downtime.

Additional advantages:

Z completely made of stainless steel

Z space requirement only 3.6 x 1.8 x 2.7 m

Z light weight of only 1.900 kg

Z self-adjusting lter cloth

Z easy servicing and cleaning due to simple design

Z cleaning water and ltrate drainage are separate

units

Z low maintenance cost

Z pre-dewatering, thickening and belt press can beoperated separately


6/14


The alternative process makes every effort to produce

an almost absolutely dry product (95-98% DS). The

procedure is based on the nding, that an economical

dewatering of sludge needs different technologies to

be utilized for each phase of the dewatering process.

This understanding led to the development of a simple inte-

grated system with an economic viability, which until now

has not been achieved by any other method.

The system consists of 3 stages:

Z gravity dewatering and thickening

Z pressing and

Z air drying after pelletizing the sludge.

It was essential to develop new equipment for this

technique. The unique stages can be used separately

or combined with existing conventional dewatering

processes.

For an economical drying two factors play an es-

sential role: The water content and the form of the

material. To dry sludge from 30 % to 95 % requires

evaporating 133% more water than drying from 50

% to 95 %. As a result energy demands and costs

increase.

Likewise important is the shape of the material. Water

is evaporated from the surface which causes water to

disperse from the core toward the outside. Therefo-

re a pellet with a cylindrical shape and a diameter of

6-8 mm is desirable. It has been found out, that the

fabrication of short pellets comply best with the dryingnecessities: Moisture evaporates quickly from the

surface.

The smaller diameter facilitates rapid passage of the

water from the core to the surface and that the span

of the diffusion path from the core is the same in all

directions. The pellets have point contact only and

therefore allow a simultaneous drying of the entire

surface.

To ensure that all pel-

lets are dried equally

in a given time period

a near uniform size

of the pellets is also

important.

Sludge drying

with off-heat


7/14


The drying occurs through contact with heated sec-

tions of the dryer and by contact with hot dry air. The

construction of the dryer is made of galvanized sheet

metal elements. The individual modules are fastened

either next to or on the top of another module.

The sludge pellets are continuously fed into the top of

the dryer. The pellets slowly trickle from the top to the

bottom of the dryer. By the downward movement and

the shape of the heating trays the pellets are continu-

ously shifting from one side to the other, thus drying

fast and uniform in the warm airstream.

In order to prevent odor emissionsthe fan of the

dryer is placed on the suction side creating a low

pressure environment inside of the dryer. Apart from

exhaust air ducts, the entire dryer is heat-insulated.

The moisture loaded drying air is sucked off and

passed through an exhaust air scrubber before the

cleaned air leaves the system through a duct. At the

exhaust air scrubber cool water washes out dust and

condenses vapors. In a nal stage the air passes a

bioltration unit where microorganisms eliminate even-

tually existing malodorous organic loads.


8/14


Municipal sewage sludge contains nutrients in high

concentration, whereupon in the past it was mainly

used as fertilizer. Beside nutrients sewage sludge

also contains harmful substance in very wide-ranging

composition and concentration, depending on the

character of the incoming water. The use of sludge asa fertilizer caused severe problems. With contact to

soil even less harmful substances may change their

structure which makes a risk assessment very difcult

or even impossible.

The most environmentally benign disposal

of sludge is its incineration and mandatory

in Germany. However, the biggest drawback

is the use of expensive primary energy,

which is required to incinerate wet sludge.

At conventional sewage treatment

plants a large part of the energy

contained in the sludge is just eliminated instead of

using it efciently. It starts with feeding the sludge to

microorganisms, which thrive on the energy contained

in the sludge.

Without getting the sludge exposed to microorganisms its

energy value is higher than brown coal!

Therefore microorganisms destroy a valuable, high

energy containing product. Later on, a digester con-

verts just 1/3 of the organic matter into methane gas.

Indeed some of the produced metha-

ne gas will be incinerated and conver-

ted into electrical energy; nevertheless

large amounts of the heat energy are

used for the heating of the digester to

keep the process of methane active.

ZWith the above mentioned technology

sludge is dried with off-heat up to 95-

98% DS before it is incinerated.

ZThere is practically no heat loss caused by water

evaporation.

ZDry sludge pellets burn so well, that they can be

inflamed by a candle and continuing burning without

any co-firing.

ZThe calorific value is so high that an electrical power

generation is recommendable. Yet after electrical po-

wer generation there remains enough heat (energy)

for the drying process of the sludge!

ZThe ash of the incineration can be used for both

material- and thermal-recycling.

One application for ash from sewage

sludge incineration is to facilitate bricks.

The picture above shows a brick which

contains 50% of ash from sewage sludgeincineration.

In same way the system can be applied

for any kind of industrial sludge. Dried pa-

per sludge for example can be used as oil

binder or as raw material for the produc-

tions of paperboard products.

Sludge

recycling

Municipal sewage sludge


9/14


Pulp and paper industry

The paper and pulp industry is characterized by its

enormous water consumption. As one knows the

water does not remain in the product. It is accumu-

lating to vast volumes of wastewater to be cleanedbefore discharge into streams or sewer lines.

Required fresh water is taken from surface waters,

springs or from the public water lines as tab water. As

far as the water is not tab water, the water has as well

to be processed (puried) before it can be utilized in

the production.

In the process of cleaning up the wastewater a paper

mill produces a large volume of sludge. In order to

keep disposal costs down this (liquid) sludge has to

be drained from water, leaving (drained) wastewater

and (still wet) sludge.

With increasing disposal costs for (wet) sludge it

would be more favorable to turn this sludge into a

valuable product, putting an end to this drainage of

prots.

With new developed technologies in the eld of

wastewater treatment, sludge dewatering, sludge

drying, as well as for their recycling (mentioned above)

their application does not only reduce disposal costs.They produce prot!

The required equipment is easy to operate and the

anticipated investment costs are low. In many cases

savings in disposal costs alone result in an amortization

of the investment costs in less than 3 (three) years!

Wastewater can be puried to a degree where it can

be recycled! Sludge is turned into a valuable product

for sell or use!

Industrial

sewage

sludge


10/14


Introduction

For economic reasons, modern meat industry cant

avoid factory farming. The concentrations of extre-

mely large numbers of animals to be breed or fattened

up on one place makes the traditional discarding ofslurry difcult or even impossible limitation of land for

spreading slurry per hectare and year as well as sto-

rage capacity for up to year).

In several cases breeders are not allowed to incre-

ase their meat production since their slurry disposal

reached its limit.

Main problems

Z high COD and BOD5 loads

Z high loads of phosphates and nitrogen com-

pounds

Z odor emissions

Advantages

ZDried slurry would be an excellent fuel with a calori-

fic value of approx. 4,500 kCal/kg dry matter (approx.

18,800 kJ/kg).

ZBeside of thermal utilization slurry in its dried statecan be also used as natural fertilizer which is stabile

and easily stored over a long time period, and can be

easily dosed and spread on demand during growing

season.

ZOf course, transport is more efficient without the

burdening

Solution

The above mentioned system turns a problematic

object (slurry) into a valuable product, either into

energy or into a customer friendly fertilizer, which can

be exactly dosed and evenly spread. The system had

been developed based on the nding that the main

part of COD and BOD5 loads result from the solids.

In separating the solids, COD and BOD5 loads drop

drastically. The remaining loads in the water fraction

can be easily (biologically) decomposed.

Slurry

(Manure)

(from pig, cow

and poultry)


11/14


Description of technology

The slurry with an approx. 5% DS is pumped into a

collecting tank. From here it is pumped off into pre-

dewatering/pre-thickening cylinders where it is de-

watered by mere gravitation up to 23-24% DS. Thepre-dewatered slurry falls on a belt press where it is

dewatered to 26-28% DS. Filtrates and lter washing

water are pumped into a Quick Sedimentation Unit

in order to separate remaining solids from the water

fraction. After this step sludge and water fraction

are separately treated according to the local require-

ments.

With their loads drastically reduced the ltrate water

can be spread onto cultivated areas. For the dischar-

ge into water bodies (streams) it would pass in a nal

step a biological trickling lter. If required/mandato-

ry this step can be combined with a denitrication

process. Alternatively the water can be used as wash

water.

The solids are formed to pellets with a diameter of 8

mm and afterwards dried by off- heat up to 95-98%

DS.



12/14

Waste Water Treatment | 12Waste Water Treatment | 12

The calorific value of dried slurry is so high, that

only a small part of the heat energy from the sub-

sequent incineration is needed for the drying of the

sludge.

The remainder can be converted into electrical energy

by a steam turbine.

Since the system is completely enclosed no odor

emissions are leaving the plant.

Electrical power generation is already economical at

a slurry volume from 8.000 - 10.000 animals (cattle,

hog).

Additional advantages

Z Extremelylow space requirementin comparison

to conventional wastewater treatment systems

(~10%)

Z Cutting investment costs into half

Z Low operating cost

Z Nearly 100% usageof (the former) sludge


13/14


Instead of disposing into landfills or ocean dumping com-

mon steel mill wastes (furnace sludge, sinter sludge and

dusts) mixed with two other organic wastes can reprocessmillions of tons of ferrous wastes per year! With this system

three organic wastes are converted into a valuable product!

The final product is an absolutely dry, dust free and abrasion

resistant briquette, ready to be melt down.

Steel Mill Waste


14/14


For any further information

please contact us:

IPH GmbH

DI FRIEDRICH JAROSCH

Pretschgasser 12

1110 Wien Austria

T +431 768 31 42

F +431 768 31 42

M +43 664 338 91 95

[email protected]

www.environment-waste.com

IPH Waste Water Pres 2010 Print

Documents

Transcript of IPH Waste Water Pres 2010 Print