Bioremediation of Surface Water in Wadi Hanifah Historical - - PowerPoint PPT Presentation

Bioremediation of Surface Water in Wadi Hanifah

• Wadi Hanifah is the most

significant natural landmark in the region.

• The Wadi extends 120 km

from the northwest to the southeast of Riyadh.

• 4500 square km catchment

basin.

• 60% of the developed area in

city inside it catchment.

• Wadi Hanifah is the main

drainage for the city .

Historical Background

• The Wadi Hanifah was a source
• f water to surrounding

communities for centuries

• In the past there was a balance

between the Wadi resources and human needs

Historical Background: cont’d

Protection of the Wadi

• In 1987 the High Commission

directed the Arriyadh Development Authority (ADA) to acquire the wadi as a protected area under the management of the ADA development programs which take many actions to stop the deterioration

Action taken by ADA

• Strategy for Wadi Hanifah in

1994 .

• Stop all sources of pollution
• Stop industrial activities along

the Wadi Hanifah

• Stop mining activities
• Define floodplain boundaries
• Limit the placement of utilities
• Monitor the wadi environment

Action taken by ADA

• Planning for the Future:

In2003 ADA Finalized and approved the Wadi Hanifah Comprehensive Development Plan (WHCDP)

WHCDP: Objectives

• Protection and preservation of

the Wadi Hanifah valley

• Rehabilitation of floodplain

and drainage basin

• Maintain and preserve

historical and heritage sites

• Create a sustainable balance

between the Wadi ecosystem and the City’s needs

• Improve the quality of life
• Use of Wadi as an open space

for the City

• The Wadi Hanifah Restoration

project is the foundation on which it will build the rest of the future development programs, such as recycling water use, development of the agricultural economy and the development of open space in the Wadi.

Wadi Hanifah Restoration Project: objective

Future Generations

Riyadh

Wadi Hanifah Restoration Project: Main components

• Cleaning of Wadi bed of all

dumping

• Improve flood performance of

the channel by re-profiling and re-grading

• Channelization of water
• Cleaning the surface

water (Bioremediation)

• Improving the Wadi road

network

• Naturalization of Wadi bed
• Wadi parks

Water Resource In Wadi Hanifah:

Total : 436000m3

• NDC 33000
• Umm Qasser 5000
• Gudhwanah 6000
• Sultanah 4500
• Swaidi 6000
• Wship 7000
• Namar 9000
• AlShafa 4500
• AlBatha 370000

• Groundwater flows entering Wadi

Hanifah have high nutrient and coliform bacteria concentrations.

• Vigorous bio-assimilation through a

complex food web would result in substantially cleaner water over the length of the flow channel .

• Therefore nutrient assimilation and

coliform die-off is the goal of bioremediation.

Water Quality Background:

Bioremediation: Objectives

• Reduction of Fecal and Total

Coliform Level

• Prevention of cumulative

negative impact of nutrients loads through the wadi

• Elimination of bad odors of

water

• Establishment of aquatic

ecosystem

• Dry weather flow channel (DWFC).
• Bioremediation system

Bioremediation: Approach

Wadi Channel: DWFC

• Stone-lined trapezoidal

channels, providing habitat and sustenance for benthic invertebrates and consumer species living among the rocks

• Developed every 500 meters

to improve oxygenation and provide both habitat and food for fish.

• Harvesting fish removes

nutrients bio-accumulated through the enhanced food web.

Wadi Channel: Step Weirs and Pools

Bioremediation System

Bioremediation Process:

• This naturally occurring

process can be augmented in wastewater systems through the establishment of an ecologically efficient food web consisting of not only primary producers (algae and higher plants) but also consumer

• rganisms (fish, birds, insects,

etc).

Bioremediation Facility: Main Components

• Physical Components :

different section of facility such as inlet pools, biocells and outlet pools.

• Mechanical Components :

aeration system, fountain system and APBS.

• Biological Components :

Fishes, invertebrates, microbes and birds.

Physical Components: Bioremediation Facility Overview

HEAD POOL Outlet POOL Biocell Group 1

Training wall

Biocell Group 3 Biocell Group 2

Gate

Physical Components: Group 1

• Inlet Pool
• 1 Inlet Channel
• 20 Bio-cells
• 2 Outlet Channels

Physical Components: Group 2

• 1 Inlet channel
• 34 Bio-cells
• 2 Outlet Channels

Physical Components: Group 3

• 2 Inlet Channels
• 80 Bio-cells
• 3 Outlet Channels
• Outlet Pool

Outlet POOL

A A Gate

A A

Inlet Channel Biocell Head Pool Central Marsh Channel Riffle Zone

Section A-A:

Outlet Channel

Bioremediation Process: Bio-cells components

• Biocell Head Pool
• Central Marsh Channel
• Riffle Zone

Riffle Zone Central Marsh Channel Biocell Head Pool

Bioremediation Process: Inlet channel

Pump air in the inlet channel to :

• Provide dissolved oxygen (DO) for

living organisms - Organisms consume and convert organic material in the water column (carbon and nitrogen).

• Kill pathogenic bacteria (fecal

coliform) with high dissolved

• xygen levels.

• Provide optimum habitat for fish.
• Provide aggressive mixing to limit

toxic blue green algae.

• Provide aggressive mixing to achieve

complete mix conditions in influent channels – improve reaction kinetics.

Bioremediation Process: Inlet channel

• Provides habitat for complex

food web.

• Contains installed APBS to

maximize nutrient assimilation into community and small fish feeding.

Bioremediation Process: Bio-cell Head Pool

Bioremediation Process: Central Marsh Channel

• Provides additional aquatic

and benthic habitat.

• Creates habitat for predators,

such as herons and kingfishers that feed on small fish, invertebrates and plants.

• Is planted with shrubs that

also act as effective phytoremediators.

• De-nitrification in the bottom

parts

Bioremediation Process: Riffle Zone

• Provides water mixing,
• xygenation and small
• rganism habitat.
• De-nitrification in the bottom

parts

Bioremediation Process: Outflow Channels

• After passing through the

biocells water collects in either of two side collector channels which then converge on a new group of biocells.

MECHANICAL COMPONENTS:

• AERATION SYSTEM
• FOUNTAIN SYSTEM
• ARTIFICIAL PERIPHYTON BENTHIC SUBSTRATE (APBS)

BIOLOGICAL COMPONENTS

• BIRDS
• FISHES
• INVERTEBRATES
• MICROBES
• VEGETATIONS

BIOREMEDIATION SYSTEM MONITERING

• Water Flow
• Water quality
• Sedimentation Rate
• Aquatic Ecosystem

Establishment ( fish, invertebrates, birds and vegetations

Monthly Flow at the influent of the facility

MONTHLY AVERAGE LEVEL AT INFLUENT & EFFLUENT OF BIOREMEDIATION FACILITY

MONTHLY AVERAGE LEVEL AT INFLUENT & EFFLUENT OF BIOREMEDIATION FACILITY

MONTHLY AVERAGE LEVEL AT INFLUENT & EFFLUENT OF BIOREMEDIATION FACILITY

MONTHLY AVERAGE LEVEL AT INFLUENT & EFFLUENT OF BIOREMEDIATION FACILITY

MONTHLY AVERAGE LEVEL AT INFLUENT & EFFLUENT OF BIOREMEDIATION FACILITY

MONTHLY AVERAGE LEVEL AT INFLUENT & EFFLUENT OF BIOREMEDIATION FACILITY

MONTHLY AVERAGE LEVEL AT INFLUENT & EFFLUENT OF BIOREMEDIATION FACILITY

BIOREMEDIATION PERFORMANCE EFFICIENCY

CONCLUSION:

• The facility is performing well in level reduction
• f important parameters such as : Suspended

Solids, Organics (BOD), Ammonia-N, TKN, Total Phosphorous and Fecal Coliform .

• The facility is successful in nutrients assimilation

into higher level of food chain (migratory birds) with its established biodiversity.

• The system is functioning with out odour in the

water at the effluent.

• The facility has created an aesthetic landmark

in the center of highly urbanized city of Riyadh

THE END