DAO 35
DAO 35Lugod, Cyril Benedict V.DAO 35DENR Administrative Order
No. 35pursuant to provisions of Sec. 6 of PD 984 (Pollution Control
Decree of 1976)revised effluent regulations of 1990revision and
amendments of the effluent regulations of 1982it concerns all
industrial and municipal wastewater effluents
DefinitionsBOD- measure of approximate quantity of dissolved
oxygen needed by bacteria to stabilize organic matter in the
wastewaterCoastal Water- open body of water along the coastline up
to the 200-m isobath or 3-km distance, whichever is
fartherEffluent- any wastewater in its natural state issuing from a
plant
DefinitionsMixing Zone- place where effluent discharge from a
source mixes with the receiving body of waterStrong Water-
wastewater whose initial BOD value before treatment is equal or
greater than 3000mg/L
Heavy Metals and Toxic Substancesclassified as Class A, B, C, D,
SA, SB, SC, and SD depending on the values of the following
parameters
Conventional and Other Pollutants Affecting Aesthetics and
Oxygen Demandclassified as Class A, B, C, D, SA, SB, SC, and SD
depending on the values of the following parameters
Effluent Standards for BOD for Strong Industrial Wastesfor
strong industrial wastewaters with high BOD and where the receiving
body of water is Class C, D, SC, and SD, these rules and
regulations apply
Mixing Zone Requirementsthe designated uses of the receiving
body of water shall not be significantly impairedit shall not
include an existing drinking water intakeit shall not create a
barrier of migration of aquatic life
Mixing Zone Requirementsit shall not include a nursery area of
indigenous aquatic life, shellfish farm, tourist zone, and national
marine parkslength should be as short as possible and its width
shall preferably be not more than half the width of the
waterwayMixing Zone Requirementsin discharging hot effluents from
power plants, ore milling, and similar generators of large volume
of liquid wastes, the permissible size of the mixing zone shall be
determined through modelling taking into consideration the size,
hydraulic and hydrological data of the receiving body, and the
design of the wastewater outfallit must not be used as a substitute
for wastewater treatment facility
Prohibitionsno industrial or domestic sewage effluents shall be
discharged into Class AA and SA watersno new industrial plant with
high waste load potential shall discharge into a body of water
where dilution capacity during dry weather is insufficient to
maintain prescribed water qualityProhibitionsno person shall
discharge wholly or partially untreated industrial effluents into
bodies of water
Sourcehttp://www.emb.gov.ph/portal/Portals/0/Cache/DAO%201990-35.pdf
