WCS WPL VSF04 Manuel utilisateur

VSF04 WPL SANDFILTER

OPERATION AND MAINTENANCE MANUAL

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Operation & Maintenance Manual 
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Contents 
Contents ............................................................................................................................................................1 
SAFETY........................................................................................................................................................3 
1 Health and safety at work act 1974:......................................................................................................3 
2 General health and safety: ...................................................................................................................3 
3 Leptospirosis: ......................................................................................................................................3 
4 Sensible precautions:...........................................................................................................................3 
5 Vaccinations:.......................................................................................................................................4 
Risk Assessment Notes....................................................................................................................................4 
INTRODUCTION...........................................................................................................................................6 
DELIVERY....................................................................................................................................................6 
1 Off-Loading...............................................................................................................................................6 
2 Extent of Supply........................................................................................................................................7 
3 Electrical Equipment..................................................................................................................................7 
4 Bolts and Bolt Strips ..................................................................................................................................7 
5 Lifting .......................................................................................................................................................8 
TANK INSTALLATION - IN GROUND...............................................................................................................9 
1 Introduction..............................................................................................................................................9 
2 Installation of Unit.....................................................................................................................................9 
3 Local Ground Conditions.......................................................................................................................... 11 
4 Installation of Kiosk ................................................................................................................................. 12 
5 Connections to kiosk................................................................................................................................ 12 
PIPEWORK, DUCTS AND SAMPLE CHAMBERS.............................................................................................. 13 
1 Pipework ................................................................................................................................................ 13 
2 Sample Chamber..................................................................................................................................... 13 
ELECTRICAL INSTALLATION......................................................................................................................... 14 
PLANT DESCRIPTION.................................................................................................................................. 15 
1 Plant Description..................................................................................................................................... 15 
Operation and Maintenance...................................................................................................................... 16 
1 SAND FILTER COMMISSIONING AND OPERATING INSTRUCTIONS ............................................................... 16 
........................................................................................................................................................................ 19 
APPENDIX 1...................................................................................................................................................... 20 
KIOSKS AND BASE SLABS............................................................................................................................ 20 
Medium Kiosk............................................................................................................................................... 20 
Large Kiosk................................................................................................................................................... 20 
Extra Large Kiosk........................................................................................................................................... 20 

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APPENDIX 2...................................................................................................................................................... 21

LIFTING..................................................................................................................................................... 21

APPENDIX 3...................................................................................................................................................... 22

APPENDIX 4...................................................................................................................................................... 23

Revision History:

Date

Change description

Owner

Checked

Revision

09/07/2015

First issue

TGH

13/01/2021

Revised Layout

07/07/2021

New front and pack page

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SITE NAME

1. SAFETY

It is extremely important that maintenance procedures in this document are followed. Any deviation from

this could cause serious injury or have a detrimental effect on the filter and its operation.

1.1 Health and safety at work act 1974:

Section 6a of this act requires manufacturers to advise their customers on safety and handling

precautions to be observed when operating, maintaining and servicing their products.

The user’s attention should be drawn to the following:

•All sections of this manual should be read before undertaking work on the equipment.

•Suitably trained personnel must carry out the installation.

•Normal safety precautions must be taken and appropriate procedures observed to avoid

accidents.

•Refer to WPL Ltd for further technical advice or product information.

1.2 General health and safety:

The layout of the Croesgoch plant has been laid out to ensure that health and safety on site is optimised.

It will be vital that the routes to all of the equipment are laid out in a proper manner and they a re

followed implicitly. Lone working in the plant should be prohibited.

1.3 Leptospirosis:

The following is extracted from a health warning card issued to WPL Ltd’s staff. It is the client’s

responsibility to ensure that the relevant Personal Protective Equipment (PPE) is available and used.

There are two types of Leptospirosis that effect people in the UK and they are as follows:

1. Weil’s disease, which is a serious infection transmitted to humans by contact with soil, water or

sewage that has become contaminated with urine from infected rats.

2. Hardjo-type Leptospirosis, which is transmitted from cattle to humans.

The typical symptoms for both diseases start with a flu like illness, with a persistent and severe headache,

muscle pains and vomiting. Jaundice generally appears on the fourth day of the illness.

The bacteria can enter your body through cuts and scratches or through the lining of the mouth, throat

and eyes.

1.4 Sensible precautions:

After working with contaminated fluid or other materials it is important that hands and forearms are

washed thoroughly with soap and water. If your clothing or boots become contaminated then they

should also be washed immediately after use.

Immediate action should be taken, so that any cuts scratches or abrasions are washed thoroughly with

clean water, prior to applying any protective covering (plaster or bandage).

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Do not handle food, drink or smoking material without first washing your hands. If you display any of the

symptoms described after coming in to contact with sewage; report to your doctor immediately advising

them of the circumstances.

1.5 Vaccinations:

To avoid the possibility of illness it is recommended that all site personnel have the following

vaccinations. WPL Ltd also recommends that you that you consult your doctor for any additional

vaccinations that you may require. The general vaccinations WPL use for all personnel are as follows:

•Hepatitis A

•Hepatitis B

•Polio

•Tetanus

•Typhoid/cholera –probably carried out as a child.

2. Risk Assessment Notes

This section of the manual is intended as a guide and as such does not cater for every situation that may

be experienced on site. WPL Ltd assumes that the installer/end user has ensured that all necessary

permissions have been sought and granted and that the installation procedures will be carried out

observing the requirements of the Health & Safety at Work Act and will involve good building and sound

civil engineering practice. Please ensure that due consideration has been given to and appropriate action

taken with regard to the following:

➢Planning permissions & Building Regulations and other regulating or interested parties.

➢Environment Agency consent to discharge.

➢The legal responsibility for the plant as far as operation and maintenance and ongoing discharge is

concerned.

➢Note –failure to comply with any regulation may result in pollution, odour and nuisance and health

hazards, which may lead to legal action.

➢The size of the plant relevant to the number and type of people that will be using it, e.g. domestic,

light industrial, etc. Consideration should be given to any unusual conditions such as B & B

accommodation, special laundry requirements and frequent entertaining.

➢Costs, legal implications and siting in consideration to shared systems.

➢The whereabouts of wells, bore holes and springs used as sources of potable water; existing non-

mains sewerage systems and soakaways; water courses, ponds and lakes and designated protected

areas.

➢The whereabouts of other services, pipes, cables, ducts, etc.

➢Local ground conditions. Is specialist knowledge of civil engineering required to cater for unusual soil

conditions such as underground rivers, running sand, chemicals in the soil, etc?

➢The water table at the time of installation. Specialist knowledge is required when installing in an

excavation that allows water to enter.

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The water table in winter. Special consideration should be given to installations that will be subject to

high water table pressure or flood conditions. The treatment plant will need to be installed so that it

cannot “float” out of the ground and provision made for continued discharge of treated effluent, should

the discharge pipework/soakaway be under water.

Note –failure to maintain the ability to discharge may result in pollution, odour and nuisance and

health hazards, which may lead to legal action. WPL can not be held responsible for failure to

discharge due to poorly designed, constructed or positioned soakaways and discharge pipework

systems.

Siting. The plant must be sited within 30m of heavy vehicle access for de-sludging. The plant should,

where possible, be sited above the high water table mark and above or beyond the flood plain. See items

above and accompanying note. The plant should be sited as far from the habitable parts of the dwelling

as possible. Many local authorities recommend 10m as a minimum, but easements are possible for

smaller sites.

Gas & odour ventilation. WPL recommend that the plant be vented. This can be via the vent pipe,

normally attached to the building, or by additional venting (high or low level) off of the inlet or outlet

pipework or the sample chamber.

Sample point. A safe and adequate sampling point is usually a requirement of the Environment Agency.

This can be an off the shelf item or constructed using standard drainage components. Open pipe

discharges to ditches, watercourses, etc, through pipework of less than 5m in length, do not require a

sampling point if the effluent can be sampled from the end of the pipe.

Electrical supply. A qualified electrician (see Electrical Installation section) should only undertake

electrical installation. A safe and reliable power supply is required at all times, as the air blower is

required to run continuously. Adequate means of air or power failure indication should be provided. This

can be an audible or visual alarm or by regular manual checks.

Due to the health risks associated with raw sewage, WPL recommend that the sewage treatment plant is

not used until the system is complete, commissioned and handed over.

Before carrying out any maintenance or installation 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, in particular warning of deep water in

the tanks.

Any visiting personnel must report to site office on arrival and fully acquaint themselves with safety

regulations applicable.

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3. INTRODUCTION

The WPL range of sand filters has been designed to treat the treated effluent from sites with population

equivalents in the range of 1 up to 600 persons

Use of the sand filter can achieve BDO and TSS standards better than 10mg/l.

The plant is designed for either above or in ground installation. This installation manual deals only with in

ground installation. Blowers and controls to provide air to the unit are housed in a kiosk adjacent to the

plant. All tanks, covers and kiosk are manufactured in GRP for corrosion resistance and long life.

4. DELIVERY

4.1 Off-Loading

The purchaser may be responsible for off-loading at the nearest roadway to site that is suitable for heavy

goods vehicles. A minimum height clearance to 16’ 6” (5m) is required. If there are electrical cables

overhead, ensure that there is a means of turning the power off. For off-loading from a lorry mounted

HIAB, there needs to be a firm area for the stabilisers, the total width being a minimum of 15 feet (4.6m).

If the nearest road access for a heavy goods vehicle is not adjacent to the site, it is the responsibility of

the purchaser to arrange transport from the road to the site. If in doubt, contact WPL as soon as possible

with any queries.

Inspect the unit for any damage to the base before placing on the ground and then inspect the sides. The

unit should only be placed on level ground with no sharp stones, bricks etc as they may damage the base

of the unit.

The control panel and blowers should be stored in suitable conditions i.e. dry and condensation free.

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4.2 Extent of Supply

See the delivery note for full details. The standard unit comes with the following:

A GRP tank, incorporating the two sections

A blower kiosk with blower and control panel fitted.

Items supplied loose will be found either inside the filter section or on a separate pallet.

4.3 Electrical Equipment

All electrical equipment, including blowers, must be stored in clean dry conditions until required for use.

If the electrical equipment is fitted into the kiosk, some form of anti-condensation heater will be required

if the unit is not to run immediately. (Data Sheets for electrical components can be found in appendix 3).

4.4 Bolts and Bolt Strips

Due to the settling of the joints during transportation of the unit, the bolts may become loose and need

tightening. It is important that the bolt strips are not overtightened as this can cause leaks.

Tighten all bolts in the metal strips to 50Nm to ensure all the foam is compressed then tighten up to a

final value of 60Nm. Silo Bolts (with no metal strips) around the top of the unit should only be tightened

to 30Nm.

Closed Cell

Foam Strip

50 then 60 NM

(35 then 44 lb.ft)

Pinched Foam Strip

Can Cause Leaks

CAUTION Do Not Over Tighten

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4.5 Lifting

See Appendix II for lifting points.

DO NOT walk on top of the units with muddy boots, as this will scratch the surface.

NOTE: Units with extensions, for inverts greater than 0.5m, turrets with covers are supplied separately

and therefore the unit may collect rainwater.

When moving across rough ground, great care should be taken to avoid increased loads due to sudden

movement of the unit.

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5. TANK INSTALLATION - IN GROUND

5.1 Introduction

All installation procedures should be carried out observing the requirements of the Health and Safety at

Work Act and involve good building practice.

During the course of installation the following will be required:

-Normal construction equipment and plant

-Concrete for base. This MUST be designed to support the unit for normal operation.

-Calculate the amount of backfill required. THIS IS VERY IMPORTANT. Lean mix or dry mix

concrete must be used to backfill the excavation. However, prevailing local ground condition

may override this requirement. If wet mix concrete is to be used, a qualified civil engineer

must be consulted and the pour cannot take place in a single operation. Contact WPL for

further information

-Adequate supply of water to fill unit

-Pumping equipment where necessary.

N.B. Installing in an excavation that allows water to enter (i.e. is not dry) requires special advice.

Water table and flood conditions are typical examples that will cause problems during

installation. It may also affect the operation of the plant. Again, specialist advice must be taken

in these conditions.

5.2 Installation of Unit

Step 1 Excavate to tank dimensions (see GA Drawings) with minimum of 150mm clearance all

round and under base of unit. Allow adequate clearance for all pipes and any other connectors

to the unit.

Backwash

Effluent Influent

Orientation of Sand Filter

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