CROB(Chlorophyll Removal Ozone Bubbler)

What is a Green Algae Bloom?

In aquatic ecosystems such as rivers, seas, and lakes, green algae bloom is a natural phenomenon where increased nutrient levels lead to the proliferation of green algae, causing the water to appear green.

Green Algae Situation in South Korea

The issue of green algae becomes increasingly severe from July to October, coinciding with the rapid rise in water temperature each year.

Annual green algae blooms are observed in various rivers throughout South Korea, including the Nakdong River, Geumgang River, and Yeongsan River.

Causes of Green Algae Blooms

Issues Associated with Green Algae

Underwater Oxygen Decrease and Biodiversity Loss

Green algae block sunlight underwater and limit oxygen levels, resulting in decreased oxygen in the water and the death of aquatic life.

Toxins Production

Cyanobacteria produce toxins like microcystin and anatoxin, which can harm livestock and crops, resulting in food poisoning in people.

Impairment of Tourist Attraction Aesthetics

in tourist destinations with high visitor traffic, the unpleasant odor of green algae and poor water quality can create a negative impression among tourists

Foul Odor

The disturbance of the underwater ecosystem leads to fish deaths, generating a foul odor. Moreover, the presence of geosmin, a compound produced by specific blue-green algae that causes green algae blooms, further enhances the unpleasant smell.

The Solution to Green Algae

Numerous methods are employed to mitigate green algae, such as water turbines, chemical sprays, and artificial wetlands;

however, these approaches prove ineffective and challenging to maintain.

CROB(Chlorophyll Removal Ozone Bubbler) CROB: A water purification device that uses a diffuser to release ozone in the form of fine bubbles to eliminate chlorophyll a (green algae, blue green algae, and diatoms) and promotes water circulation using energy. One CROB unit can control multiple diffusers.

CROB Product Specifications

Specifications

	Power-efficient operation at 1.5kW
	Cost-effective for both installation and maintenance
	Compact and user-friendly, with easy installation and operation.
	Small and lightweight for easy portability
	Leaves no chemical residues or sludge at green algae removal sites.
	Supports smart device control from multiple locations, including the field, the manager's office, and CROB Co., Ltd. Headquarters

Product Effectiveness

Performance

Cheonan National Manghyang Cemetery Fountain Outdoor CROB TEST / Flow Rate 0.6ton)

Yesan Bongsoosan Natural Recreation Forest CROB TEST / Flow Rate 16ton)

(Tropical pond within the four-season greenhouse at the National Arboretum Indoor CROB TEST)

Results 12 hours of operation : Green algae removal rate of 76.1% 24 hours of operation : Green algae removal rate of 99%

Indoor Operating Conditions Operation time : 12 hours Installation location : Lower section of the pond within a tropical Greenhouse equipped with circulation facilities(Flow rate : 25tons)

(Sejong National Arboretum CHeongryujiwon CROB TEST)

Results 12 days of operation : Green algae removal rate of 22.47% 21 hours of operation : Green algae removal rate of 48%

Outdoor Operating Conditions Operation time : 24 hours Operating duration : 22/5/4~22/5/25 Installation location: Positioned midway between points B and C, and point E of Cheongryujiwon , equipped with circulation facilities(Flow rate : 160,000tons)

(Pond within the Palace Garden at the National Arboretum CROB TEST / Flow Rate 232 tons)

(Laboratory-Scale Test Using a 1.8tons Water Tank / Flow Rate 1.8 tons)

(Anseong Gondo CROB TEST / Flow Rate 16 tons)

(Anseong Gondo CROB post-delivery management)

(Malaysia Kelana Jaya CROB TEST / Flow Rate 0.6ton)

(Malaysia Kampung Pasir CROB TEST / Flow Rate 0.6ton)