HYTECH WATER LTD

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Landfill Leachate Treatment

Programme of Works – Leachate Treatment Plants

Once the go-ahead is given, Hytech Water can usually have a detail design produced within 4 weeks.

Owing to the earlier preliminary works, the outline design of the plant should have been firmed up sufficiently for the on-site Civil works to start within 2 weeks of the instruction to proceed.

Concrete tank construction would then start 6 weeks later, with all civil works being completed 10 to 14 weeks from the on-site start date, dependent on the size of the plant. The MEICA works would take a further 4 to 6 weeks, culminating in Plant Commissioning and Operator Training. Process Commissioning usually takes from 4 to 6 weeks, depending on the quality of the seeding sludge, the ambient temperature and strength of the leachate.

Thus the plant construction programme — from start on site to plant commissioning — would take from 16 to 20 weeks dependent on plant size, with the Process Commissioning taking a further 4 to 6 weeks.

Site Arrangements

The civil works would be controlled entirely by the Hytech Water full time site agent. He would arrange for all site clearance works, and the construction of all compound areas and sub-bases. Within 8 weeks of the start date, the specialist concrete contractor would reach site to construct the reinforced concrete bases and tanks.

Following the curing of the concrete, the tanks would be water tested. After testing, all backfilling around the tanks would be completed and the compound brought up to within 100mm of finished level.

All underground cable ducts, drawpits, and pipework would be installed beneath the compound, and the compound surface brought to finished level. The compound fence and gates would also be installed during this final stage of the civil works.

For a short period both the civil site agent and the MEICA site agent would both be on site to ensure a proper handover. Thereafter, the full time MEICA site agent would run the site, ensuring that all the materials, components and services were available for the specialist Mechanical and Electrical installation teams to complete their works as programmed.

Commissioning

There are 2 stages to commissioning – Plant commissioning and Process commissioning.

The electrical and mechanical commissioning of the Plant is incorporated into the construction of the plant, using surface water to test all systems following a rigorous procedure developed over many years.

The Process commissioning will be to some extent governed by the availability both of leachate in treatable quantities and the operations staff — at least one person full time — to run the plant.

However, Hytech Water would be responsible for all the initial arrangements — seeding sludge, chemicals, analyses — assisted by specialist technicians experienced in leachate treatment.

Plant Monitoring

All LTPs are PLC controlled and incorporate a full SCADA system tailored to suit the particular plant.

Assuming a telephone connection is available, Hytech Water is able to monitor the operation of the plant remotely, logging on at any time to assist in the resolution of any problem which arises.

This facility extends not just throughout the 12 months Defects Correction Period, but can be maintained for the life of the plant.

Plant Maintenance

A minimum maintenance cover is provided as part of the Construction Package – one visit after 3 months operation plus a further visit at the end of the Defects Correction Period.

A full schedule of maintenance visits (including emergency call-out cover) is available on request.

Additional Works

Hytech Water would be pleased to quote for any works associated with the plant such as remote leachate extraction systems, air driven pumps, inflow pipelines, discharge pipelines and new electrical supplies.

All such works would be provided on a Design & Build basis, and can include negotiations with the relevant Utility if required.

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