PortfolioWhat We Have Already Done


Documented Performance

Solutions that have been field-proven for decades.

Client: City of Santa Cruz, SAGUAPAC
Date: November 19, 2009
Info: Municipal WWTP

Gurney Environmental provides wastewater treatment upgrade for 2.5 million population city in Bolivia.

In late 2009, Gurney Environmental Ltd. completed the installation of an internationally tendered, World Bank funded project to address wastewater processing issues in the city of Santa Cruz de la Sierra, Bolivia. The 2.5 million population city’s infrastructure is under stress due to significant population growth. The wastewater treatment plant (wwtp) had been in an overloaded condition resulting in low rates of processing, sludge accumulation and odour issues.

 The operations company, SAGUAPAC, owns and operates the wwtp, which is located in a northern suburb of the city. The North wwtp utilises facultative lagoons of about 50 hectares

Design Data – 2009

  • Flow of 34,000 m3/day
  • BOD load of 3,400 kg/day
  • Aerial loading on the two primary facultative lagoons averaged 249 kg BOD/hectare/day
  •  Complete lack of dissolved oxygen (DO) in the water column
  •  Suffering from odour and processing problems.

Watch The Video

PRIVACY NOTICE: For videos, we use YouTube's "no-cookie" privacy mode in compliance with our Privacy Policy. However, if you have been to another Google site or a site that uses any of Google's many embedded services, you may already have cookies from Google that will be "discovered" by YouTube (a part of Google) when you play a video. We cannot block those existing cookies.

Normally SAGUAPAC would have constructed more lagoons to increase treatment capacity but as no land was available at this wwtp (being hemmed in on all sides by the city’s encroachment) another option was needed. In similar situations in other parts of the world, a more mechanised method of wastewater treatment, such as activated sludge for instance, might have been chosen, but this was not deemed cost effective or sustainable.

Instead, a Gurney Environmental Accel-o-Fac® design and equipment upgrade was installed as shown on the General Arrangement drawing (above).


Within 6 weeks of commissioning, the lagoons established a positive DO content – the first time this had happened. The odour had dissipated and the processing rates and treatment performance increased significantly. The lagoons continued to operate at pre installation flows and loadings and maintained a good DO level throughout with a healthy green colour as would be expected.

In order to be able to keep up with the increasing wastewater flows, during 2010 SAGUAPAC gradually increased the wastewater loading on the primary lagoons up to about 1.7 times pre installation levels, at which point the lagoons started to lose their colour and the DO levels dropped off, albeit no odour resulted. SAGUAPAC has since reduced the loading to about 1.5 times pre installation levels and has elected to operate the lagoons under these conditions ever since.

The Accel-o-Fac® system has provided an overall improvement in lagoon treatment capacity enabling a 50% increase in flow throughput with only a modest expense in equipment and a negligible increase in operating costs. Compared with alternatives, Accel-o-Fac® offered best value for money and through the use of the abundant winds, the most sustainable upgrade option.

Sample Projects Portfolio

  • All
  • Source Management
  • Wastewater
  • Default
  • Title
  • Date
  • Burncrooks WTW is located near Strathblane on the outskirts of Glasgow and is fed by a series of reservoirs. It serves a nearby population of more than 50,000. It was identified that the WTW
    Read More
    • Source Management
  • Gurney Environmental provides wastewater treatment upgrade for 2.5 million population city in Bolivia. In late 2009, Gurney Environmental Ltd. completed the installation of an internationally tendered, World Bank funded project to address wastewater processing
    Read More
    • Wastewater
  • Following use of an Aero-Fac® system on Sandringham Estate for 6 years, Gurney Environmental was contacted by the Crown Estate to examine solutions for Windsor Estate and Cumberland Lodge complex. The old 1960-era filter
    Read More
    • Wastewater
  • Southern Water's Weir Wood Reservoir is a 1.5-mile (2.4 km) long stretch of water storage, situated close to Forest Row, East Sussex, England, on the north-western margins of Ashdown Forest. In 2016 Gurney Environmental
    Read More
    • Source Management
  • The success of Anglian Water’s wwtp at Sutton St James prompted the company to install three additional Aero-Fac® systems in treatment works including one at East Harling in Norfolk. The decision to choose the
    Read More
    • Wastewater
  • For the Errol project, siting the project did not require consideration of access roads for sludge lorries due to the uniqueness of the Aero-Fac® system.
    Read More
    • Wastewater
  • Early in 2013 United Utilities placed its first order for the unique ResMix 'source management' system following successful use of the system by Scottish Water since 2009 and over 15 years in Australia.
    Read More
    • Source Management
  • The Accel-o-Fac® wind-powered WWTP for the village at Holkham Estate, England has been treating sewage since the spring of 2006, and with virtually no significant ongoing operating cost.
    Read More
    • Wastewater
  • Accel-o-Fac® wastewater treatment upgrade to the Harbour View WWTW located just outside Kingston Town, owned and operated by the National Water Commission.
    Read More
    • Wastewater
  • The Aero-Fac® Sludge Digestion System (SDS) at Sandringham solves the issues of sludge handling and disposal, as well as peak flow and load issues.
    Read More
    • Wastewater
  • Accel-o-Fac® wastewater treatment system for the Severn & Wye Smokery in Gloucestershire providing a zero carbon footprint strategy for the business.
    Read More
    • Wastewater
  • Accel-o-Fac® upgrades at South Gippsland Water for implementation at two of their wwtp's located just outside Inverloch, Victoria in Southeastern Australia.
    Read More
    • Wastewater
  • In July 2016, Gurney Environmental installed a 2nd installation of the ResMix 5000cc ‘source management ‘ system for Welsh Water at Llangdegfedd Reservoir in Wales.
    Read More
    • Source Management
  • Welsh Water installs first ResMix 5000cc Source Management System at the Pontsticill Reservoir to improve water quality prior to treatment works.
    Read More
    • Source Management

What Our Clients Say

Aero-Fac® Wastewater Treatment System

"The Aero-Fac system at Windsor has to date met and exceeded our consent discharge levels, and we have been very happy with the system installed."

Andrew Dunning, The Crown Estate Windsor

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7

A Few of Our Many Clients

Be the Next to Join Our Global Client List.


scottish water logo
jersey water logo
wessex water logo
welsh water logo
southern water logo

south west water logo
anglian logo
united util logo
yorkshire logo
jamaica nwc logo


Talk With Us Now

subscribe graphic element white 2

Join Our Newsletter


Start receiving our industry-related Technology Newsletter that covers industry-specific news, services, technologies and event notifications.

Join Our Newsletter
Gurney Environmental Ltd. © All Rights Reserved | Privacy Policy



Access private client areas.

(NOTE: You MUST have already accepted cookies
in order to login. If you previously declined cookies,
before logging in scroll down to
Reconsider Cookies and Accept.

Contact Us