Pollution Control

CLIENTS & APPLICATIONS

Case profile:

Case Profile: Ightham Mote

Client: The National Trust

Project Background

Ightham Mote is a moated medieval manor house dating from the early part of the 14th century. Since undergoing renovations in 2005, the site has a restaurant and café, which hold functions as well as having daily visitors. The site attracts an average of 500 visitors per day as well as having 20 staff and 26 residents. The client wanted a decentralised system due to the distance to the sewer and the impossibility of having gravity flow into it. The effluent would need to be pumped which was an ongoing cost on top of the utility bill. The discharge consent was 10:10:1 into a local stream and 20:15:5 out of the Eco-SAF beforehand.

Project Scope

To supply a complete biological system including primary settling and balance, Eco-SAF (Submerged Aerated Filter, and clarifier, which then enters a constructed wetland. The plant was a 306pe plant based on 200l/person/day, and 60g BOD/person/day. The system was completely underground with access from the top. This was because the system was overlooked by the cottages and so had to be visually acceptable.

Scope of Work

Pollution Control (UK) Ltd supplied an EcoSAF biological plant complete with primary treatment and final clarification. To overcome sizing problems The EcoSAF was a dual-stream model, which can be operated at 50% capacity during the quiet winter months, saving on energy and overuse. Attached after the clarifier was a five-tiered wetland that had a mixture of aerobic and anaerobic levels. These formed a biological polishing system, which the National Trust felt was appropriate for an environmentally friendly and sustainable image.

Equipment Supplied

- A stainless steel 306pe EcoSAF system including primary/balance & final clarifier.
- 10m³ grease trap after restaurant.
- Duty standby side channel inverter driven blowers in a low-level brick enclosure for low visual impact.
- Fully integrated control panel in a small enclosure.
- All pumps, pipe work and connections.
- Fully automated alarm system.

Installation

Complete mechanical installation was undertaken by Pollution Control (UK) Ltd engineers including electrics, alarm systems and part of the civils. The system was fully functional within a week and fully achieving consents within six weeks!

Result

PARAMETER	CLARIFIER (12month min/max analysis)	WETLAND (12month min/max analysis)
BOD	1,5-22	< 1-13
Suspended solids	1-11	1-5
Ammonia	2.5-5	0.03-5
Phosphorous	1-7	1