Wastewater Treatment - Webs

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22 Φεβ 2014 (πριν από 3 χρόνια και 5 μήνες)

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Wastewater Treatment

Wastewater Treatment

Occurs

at

designed

plants

that

accept

municipal

sewage

from

homes,

business,

and

industrial

sites

Raw

sewage

is

delivered

to

the

plant

through

a

network

of

pipes

Treated

water

is

discharged

into

the

surface

water

environment

or

used

for

another

purpose

Divided

into

three

categories
;

primary,

secondary,

and

advanced

treatment

Sewage Treatment Process

Sewage Treatment Process

Landfill/mine reclamation

Secondary Treatment



Air

Raw
sewage

Grit

Chamber



Sludge



Digester




Activated

Sludge




Sludge drying beds

Sedimentation
Tank

Aeration Tank

Final
Sedimentation
Tank

Screens

Rivers, lakes,
oceans, etc.

Primary Treatment

Disinfection

Sewage Treatment Process

Primary

Treatment



removes

30
%

-
40
%

of

the

pollutant

volume

in

the

form

of

suspended

solids

and

organic

matter

Screen



removal

of

large

floating

material

Grit

Chamber



removal

and

disposal

of

sand,

small

stones

and

grit


Primary

Sedimentation

Tank



particulate

matter

settles

out

to

form

the

sludge


Secondary

Treatment

-


removes

90
%

of

the

pollutant

Aeration

tank



the

waste

water

is

pumped

with

air

Final

Sedimentation

Tank



the

sludge

settles

out


Digester



the

sludge

from

the

primary

and

secondary

sedimentation

tanks

are

where

it

is

treated

with

an

anaerobic

bacteria



Sustainable Water Use

Sustainable

water

use



the

use

of

water

resources

by

people

that

allow

our

society

to

develop

and

flourish

into

an

indefinite

future

without

degrading

the

various

components

of

the

hydrologic

cycle


Criteria


Develop water resources in sufficient volumes to maintain human
health and well
-
being


Provide sufficient water resources to guarantee the health and
maintenance of the ecosystem


Ensure the minimum standards of water quality for the various
users of water resources


Promote the use of water
-
efficient technology and practice


Gradually eliminate water pricing policies that subsidize the
inefficient use of water


Sustainable Water Use

Water

Conservation



the

careful

use

and

protection

of

water

resources

and

involves

both

the

quantity

of

water

used

and

its

quality


Water

Management


Wastewater

Renovation

and

Conservation

Cycle

Three

Major

Steps
:


Return

of

treated

wastewater

to

crops

via

sprinkler

or

other

irrigation

system


Renovation

or

natural

purification

by

slow

percolation

of

the

wastewater

through

the

soil,

to

eventually

recharge

the

groundwater

resource

with

clean

water


Reuse

of

the

water

by

pumping

it

out

of

the

ground

for

municipal,

industrial,

institutional,

or

agricultural

purposes


Water

Reuse



the

use

of

the

wastewater

following

some

sort

of





treatment


Existing Philippine Laws


DAO

34

-

Revised

Water

Usage

&

Classification

/

Water

Quality

Criteria




DAO

35

-

Revised

Effluent

Regulations

of

1990

Water Classification


Fresh

Surface

Waters

(rivers,

lakes,

reservoirs,

etc
.
)



Class

AA

-

Public

Water

Supply

Class

I


-

uninhabited

and

protected

watersheds,

requires

only

approved

disinfection

in

order

to

meet

the

National

Standards

for

Drinking

Water

(NSDW)


Class

A

-

Public

Water

Supply

Class

II


-

sources

of

water

supply

that

requires

only

complete

treatment

(coagulation,

sedimentation,

filtration,

&

disinfection)

in

order

to

meet

the

NSDW

standards


Class

B

-

Public

Water

Supply

Class

III


-

for

primary

recreation

such

as

bathing,

swimming,

skin

diving,

etc
.

(particularly

those

designated

for

tourism

purposes)

Class

C



*Fishery

Water


-

for

the

propagation

&

growth

of

fish

&

aquatic

resources


*Recreational

Water

Class

II


-

boatings,

etc
.


*

Industrial

Water

Supply

Class

I



-
for

manufacturing

processes

after

treatment


Class

D



*

for

agriculture,

irrigation,

livestock

watering,

etc
.


*

Industrial

Water

Supply

Class

II


-

cooling,

etc


*other

inland

waters


Coastal & Marine Waters



Class SA


-

water suitable for propagation, survival &
harvesting of shellfish for commercial
purposes


-

tourist zones & national marine parks &
reserves


-

corral reef parks & reserves


Class SB


* Recreational Water Class I


-

areas regularly used for bathing,
swimming, skin diving, etc.

* Fishery Water Class I


-

spawning areas for “bangus” & other
similar species



Class SC

* Recreational Water Class II


-

boating, etc.

* Fishery Water Class II

-

commercial & sustainance fishing

* Marshy &/or mangrove areas declared as fish &
wildlife sanctuaries


CLASS SD

* Industrial Water Supply Class II


-

cooling, etc.


-

other coastal & marine waters