What is root zone system?
The root zone/filter plant is a biological filter, where the biological treatment of waste water takes place in a soil volume, which is penetrated by roots. The root network is composed by suitable plant species, it is even beneficial if the optimum varieties of these species are selected.
How does oxidation pond work?
Oxidation ponds, also called lagoons or stabilization ponds, are large, shallow ponds designed to treat wastewater through the interaction of sunlight, bacteria, and algae. Algae grow using energy from the sun and carbon dioxide and inorganic compounds released by bacteria in water.
What is rootzone soil?
Rootzone is a highly versatile soil created from a 60/40 mix of sand and sandy soils. The blend is 40% natural sandy soil and 60% silica sand consisting of medium fine and medium coarse semi-rounded grains.
What is wetland system?
Wetland systems are engineered ecosystems that can be used for improving water quality, whether it relates to wastewater, ground water, industrial waste streams, or diffuse pollution; and can be implemented in urban, peri-urban, and agricultural landscapes.
What is BOD and COD?
Biochemical oxygen demand (BOD) is the amount of oxygen required by the microorganisms to break down the organic materials, whereas chemical oxygen demand (COD) is the amount of oxygen required to break down the organic material via oxidation.
What are the 3 stages of sewage treatment?
There are three main stages of the wastewater treatment process, aptly known as primary, secondary and tertiary water treatment.
What sand is used in root zone?
Dandy’s Root-Zone is a blend of coarse gritty sand and sandy loam topsoil.
What is Rootzone used for?
Helps prevent wind and water erosion. Supports a wide range of soil bacteria, including those that produce natural antibodies to fight against disease. Stimulates strong root growth, creating vigour in grass which leads to increased density. Creates resistance to drought, weeds and moss.
What are the 3 types of wetlands?
Types of Wetlands
What are 5 benefits of wetlands?
What are the benefits of wetlands?
- Improved Water Quality. Wetlands can intercept runoff from surfaces prior to reaching open water and remove pollutants through physical, chemical, and biological processes.
- Erosion Control.
- Flood Abatement.
- Habitat Enhancement.
- Water Supply.
Why is BOD measured for 5 days?
BOD occurs in 2 general stages. While calculating the oxygen demand, the carbonaceous stage is taken into account. This stage is almost completed in 5 days, which means that most of the organic content of the sewage is oxidized under aerobic conditions in 5 days. Hence ,BOD for 5 days is calculated.
Who limits COD in water?
According to standards of Central Pollution Control Board, permissible value of BOD is 30 mg/l and COD is 250 mg/l.
What are the 3 grades of waste water?
What are the stages of STP?
- Step 1: Screening and Pumping.
- Step 2: Grit Removal.
- Step 3: Primary Settling.
- Step 4: Aeration / Activated Sludge.
- Step 5: Secondary Settling.
- Step 8: Oxygen Uptake.
- Sludge Treatment.
Is all sand silica sand?
Regular sand, also known as feldspathic sand, brown sand, or construction sand, will always contain some silica, but only in amounts less than 95%.
What is called wetland?
Wetlands are those areas where the soil is covered with water or can be present near the ground throughout the year. It supports both terrestrial and aquatic species. They vary widely depending on the climate, soil, vegetation, hydrology, chemistry, and human disturbance.
What are the benefits of wetlands?
What are 3 reasons wetlands are important?
This certainly beats expensive, human-made filtration systems.
- Wetlands store our water to ensure supply during dry periods.
- Wetlands can prevent floods.
- Wetlands recharge ground water.
- Wetlands help to control erosion.
- Wetlands provide shelter for juvenile fish.
- Wetlands provide homes for animals and plants.
What are 3 ways we can protect a wetland?
Avoid wetlands if you are expanding your house or installing a shed. Use phosphate-free laundry and dishwasher detergents. Phosphates encourage algae growth, which can suffocate aquatic life. Use paper and recycled products made from unbleached paper.
What is BOD value?
BOD is a measure of the amount of oxygen required to remove waste organic matter from water in the process of decomposition by aerobic bacteria (those bacteria that live only in an environment containing oxygen).
How is BOD value calculated?
BOD is computed based on the difference between initial and final D.O. The test uses dilution water and a known amount of sample in a 250-300 ml incubation bottle. A small amount of seed is added to samples where microbial activity may not be present.
Which is higher BOD or COD?
COD is always higher than BOD because chemical oxidation is easier than biological oxidation.
What is BOD limit?
As per the World Health Organisation, a limit of less than 5.0 mg/l is ideal for water bodies. At this limit BOD will not cause any harmful impacts on the human body, wastewater sewage must have BOD around 80 ppm and COD 200 ppm for discharge.
What are the 3 stages of water?
Water can occur in three states: solid (ice), liquid, or gas (vapor).
What are the 5 steps of water treatment?
Public water systems often use a series of water treatment steps that include coagulation, flocculation, sedimentation, filtration, and disinfection.