BIOROCK multi-units
How it works BIOROCK also provide systems for domestic wastewater treatment for communities ranging from 20 to150 persons. Groups of houses Houses or a number of apartments Small villages, rural communities Various locations Tourist sites: hotels, restaurants, camping sites Public-access buildings: offices, hospitals, schools, sports facilities When treating larger populations the installation consists of several units working in parallel. Primary tank Effluent distribution system (flow splitter) BIOROCK units in parallel Sampling pipe or pump shaft For installations from 30 PE Primary Tank Often larger than our standard tanks and can be made from HDPE, fiberglass or concrete Must be able to be ventilated and fitted with the BIOROCK Pre-filter Minimum volume: - < 30 PE: 500 liters/pe - > 30 PE: 400 liters/ PE BIOROCK units Units must be: The same model Installed in parallel Separately ventilated Equally fed with the same amount of effluent
Features of a multi-unit installation Variable load management BIOROCK multi-unit installations can tolerate variations in loads far better than large single unit systems. This is due to an even distribution of effluent between the units allowing more time for efficient treatment. Standard installations In simple terms when a single house is occupied by a family everyone tends to get up at the same time, come home at the same time, and go to bed at the same time (most of the time). The peaks in loading are generally high. Pollution Multi-unit systems Each person or family live in a different property. The families activities and daily life often differ and facilities are used at different times. The peaks in loadings are generally spread out and are not so severe. Pollution 7h 12h 19h Time 7h 12h 19h Time Conventional installation Multiple units Sizing multiple unit installations Multiple unit systems are sized slightly differently from standard systems. The chart below shows examples of typical multi-unit installations and the units used.
Effluent distribution - Flow splitters Flow splitters installed between the primary tank and the BIOROCK units ensure the even distribution of effluent between the treatment plants. How they are used A flow splitter (or distribution system) is always required when 3 units or more units are installed in parallel + 2 units: Simple Y PVC pipe 3 units or more: Effluent distribution system required The effluent distribution system consists of two components Effluent distribution system components Flow Control Chamber Controls the volume of liquid that is distributed to the BIOROCK units downstream Splitter Box Ensures the distribution of the effluent remains even
The Flow Control Chamber The flow control chamber is the first stage of the effluent distribution system. It is fitted directly following the primary tank and serves as a buffer controlling the flow as it passes towards the BIOROCK units. 2 possible sizes : 130 litres and 200 litres How it works 2 4 2 A float is fixed at the bottom of the tank The effluent enters from the primary tank The float rises with the liquid level and locks 4 The water flows through the system 5 The water is then released from the chamber 5 2 4 Internal view of the flow control chamber
The splitter box The splitter box is the second stage of the water distribution system. It should be installed directly after the flow control chamber and efficiently splits the effluent between the units downstream. Several splitter boxes can be used on the same installation : For 3 units installed parallel More than 3 units installed parallel One inlet 3 outlets Top view Splitter boxes on a 90 person installation (6x BIOROCK 15pe units in parallel)
Example: BIOROCK 45 PE Primary tank: 45 x 400 liters = 18.000 L (15.000 + 5.000 in this example) Flow management system 3 x BIOROCK 15 = 45
Example: BIOROCK 90 PE Primary tank: 90 x 400 liters = 36.000 L Flow management system 6 x BIOROCK 15 = 90