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Installation manual for the DM sewage treatment units
Health and Safety
Section 6a of this act requires manufacturers to advise their customers on the safety and the handling precautions to be observed when operating, maintaining and servicing their products. The following requires the user’s attention:
- All the sections of this manual must be read before working on the equipment
- Suitably trained and qualified personnel must carry out installation
- Normal safety precautions must be taken and appropriate procedures observed to avoid accidents
1.2 Health
It is the client’s responsibility to ensure that all necessary protective clothing and equipment is available
1.2.1 Leptospirosis
There are two types of Leptospirosis which affect people in the UK Weils disease and Hardjo-type Leptospirosis.
Weils disease is a serious infection transmitted to humans by contact with soil, water or sewage that has been contaminated with urine from infected rats.
Hardjo-type Leptospirosis is transmitted to humans from cattle
Both diseases start with a flu-like illness with a persistent and severe headache, muscle pains and vomiting. Jaundice appears about the fourth day of illness.
The disease is caught by entering the body through cuts and scratches and through the lining of the mouth, throat and eyes.
1.2.2. Sensible Precautions
After having worked in sewage or with anything contaminated with sewage, wash your hands and forearms thoroughly with soap and water. If your clothing or boots are contaminated with sewage, wash thoroughly after handling them.
Take immediate action to wash thoroughly with clean water any cut, scratch or abrasion of the skin immediately prior to applying any protective covering
Do not handle food, drink or smoking material without first washing your hands.
If you contract the symptoms described above after coming into contact with sewage, report to your doctor immediately advising of the circumstances.
1.3 Safety
Sewage gases are potentially explosive and toxic. Do not enter any of the below ground compartments of the Bio-pure sewage treatment plant.
Before carrying out any maintenance work the equipment must be electrically isolated. Do not leave covers open for any longer than necessary. Temporary barriers and warning signs should be erected around any open covers or manholes as appropriate particularly warning of deep water in the tanks.
INTRODUCTION
The Diamond is a fibreglass and polyethylene conical shaped tank containing a circular aeration chamber, a centre draft tube with an air diffuser located in the centre through which air is continuously forced by means of a blower motor.
Raw sewage enters the Diamond through the inlet pipe flowing into the centre aeration chamber. Air released through the diffuser at the bottom of the draft tube causes an upward flow of fluid ensuring continuous combining of oxygen with sewage. This allows for growth of various aerobic organisms that biologically degrade the sewage contaminants.
Any remaining aerated solids settle to the bottom of the tank where they are drawn back up through the draft tube repeatedly until thoroughly cleansed.
As more sewage enters through the inlet and into the aeration chamber it displaces the treated effluent into the outer tank, any remaining solids will settle to the base and return back to the aeration chamber. The treated effluent will flow over the weir and out the outlet where it can be disposed of through a water course or soak away.
The Diamond is 96% efficient thus allowing long intervals before de-sludge is required. The waste water is cleaned to a standard of 20 mg/l biological oxygen demand and 30 mg/l suspended solids, meeting the usual discharge level requirement.
Delivery
The purchaser is responsible for offloading at the nearest roadway.
Inspect the unit for any damage before removing strappings. Ensure the unit is placed onto suitable ground to ensure that damage is not abstained.
Air Blower
Air Blower must be stored in clean, dry conditions until required.
Lifting
Ensure that the unit contains no water prior to lifting. The unit can be lifted by means of attaching straps to the four eye bolts. Care must be taken to avoid sudden movements of the unit when crossing rough ground.
Installation Notes
Installation should be carried out observing good working practice and adhering to the Health and Safety at Work Act
NOTE – Specialist advice must be sought when installing in high water table areas, running sand or sites prone to flooding.
It is not recommended to install unit near to trees and shrubs but if this is necessary the unit should be surrounded by a root-proof membrane.
Installation
Equipment required for Installation
Standard Installation (excluding high water table areas)
Slings and shackles for lifting
Backfill material - soil, gravel, or road chippings, etc.
Water to fill tank
Electrical cabling - armoured or ducted-2.5mm twin and earth.
IP55 rated outdoor double socket with RCD.
Grey plastic waste pipe (to act as a conduit for the air -line)
Sample chamber
1) Excavate a hole 2000mm square by1000mm deep .
2) Then dig a 'V' shaped pointed trench from the middle of one side to the other with the point of the V to the depth of the unit, ie from the lid to the bottom of the cone.
3) Continue excavating from the point of the V to form the shape of the cone of the Diamond
4) Lift the unit by means of strapping attached through the eye bolts which fasten the top of the unit to the bottom.('cone' part) ensuring there is no water remaining in the unit prior to lifting
5) Lower the unit into hole checking that the inlet and outlet connections on the unit will align with the corresponding connections.
6) Level the unit in the hole and begin backfill around the base of the unit to a depth of approximately 700mm Fill the unit with a corresponding amount of water to help stabilise the unit
Note – backfill material must be 20mm to dust scalpings or good soil taken from the excavation (no rocks, clay lumps, etc.) to ensure no damage is caused to unit
7) Plug outlet pipe temporarily
8) Fill the outlet chamber with water until it flows over the top of the weir
9) Level the unit until the surface of the water in the outlet chamber is even around the circumference
10) Continue backfill around the unit whilst simultaneously bringing the water level up within the unit until full, stopping backfill just below inlet and outlet connections
11) Connect inlet and outlet connections to sewer pipes
12) Loosely place top section back onto the unit (note – unit is marked for inlet connector)
13) Attach the blower pipe to the blower tube by means of the jubilee clip supplied
14) Securely bolt the top section to the base unit by means of the eye bolts
15) Continue backfill up to ground level
16) Bury the blower kiosk in the ground next to the unit with the lid 2" above the ground
17) Drill a hole into the neck of the tank
18) Secure blower pipe to compressor/s by means of the jubilee clip supplied.
High water table anchorage
4 x 1200mm galvanised steel angle irons (50mm x 50mm x 6mm) each with a point
at one end and a 13mm hole drilled 50mm from the end of the other end.
8 x galvanised steel ‘D’ shackles.
4 x 1200mm long, 6mm diameter welded link galvanised steel chain.
The angle irons are pushed horizontally into the soil by the digger bucket before the unit is placed in the hole. They should be placed in alignment with the eyebolts on the unit. The shackle pins are secured into the holes in the steels and to the eyebolts and the chain attached between them so that the chain is tight. The unit is thus held in the ground at 4 points.
FILL THE UNIT WITH WATER IMMEDIATELY!!
Electrical Installation
It is not feasible to state a specific installation method due to the variance of sites. It is important therefore that an electrical installation be performed in accordance with the 17th or later edition of the
The supply to the air pump housing should have a dedicated circuit incorporating isolation and protection devices. An earth leakage circuit breaker is recommended.
A device with a 30mA maximum trip current is recommended.
Installation of Air Blower
It is recommended that the air blower pump be installed in the Kiosk but care must be taken to ensure the chamber is not subject to water ingress, i.e., the lid is high enough above the surrounding ground, free from dust and dirt that could clog the air filters, with an appropriate single phase 13 amp supply via an outdoor socket fitted in the chamber itself. Access to the air blower unit will be required for maintenance. Ensure unit is well ventilated.
Note – The air blower unit can be fitted in an outbuilding within 10m of the unit. In this case, the airline from the blower to the unit MUST be housed in a conduit, eg. grey waste-pipe, to avoid soil compression.
Ensure unit is well ventilated and not subject to air temperatures exceeding 37 degrees centigrade.
We recommend that only a qualified electrician is employed to undertake the electrical installation of the air blower pump.
The air blower pipe is secured to the pump and the blower tube by means of the jubilee clips supplied.
Commissioning Checklist prior to switching on power supply
Prior to use of unit and before any sewage enters please check the following:-
- Ensure air diffuser is secure on the end of the blower tube and blower tube is secure to its mounting
- Ensure the blower pipe is not kinked or damaged in any way (make sure it has been cut to the correct size)
- Remove any construction debris from areas surrounding unit
Commissioning Checklist after turning on power supply
- Ensure the air blower is working (it should hum and vibrate slightly)
- Listen for any air leaks (tighten joints if required)
- Standing above the unit with the lid removed, check for water turbulence (the water should bubble vigorously like a pan on ‘fast boil’)
- Run some taps in the house and observe the flow into the unit (any construction debris brought in by the flow should be removed)
- Allow water to enter the unit until full, observing the displacement around the outlet weir
. Securely replace the lid.
Contact Us
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Waste Tech Environmental Ltd.
UK Tel
Ireland Tel
Sewage Treatment Specialists
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