What is a sewage lagoon

Solar sewage sludge drying in Weil am Rhein
Drying at a high level
Dipl.-Ing. Robert Schäfer; Dipl.-Ing. Michael V. KAMP
wwt 6/2012

Efficient use of solar energy: From the
What was once a problem waste is now a renewable one
Energy carriers of the future.
Report on the sewage sludge drying plant in Weil am Rhein

Solar sewage sludge drying eliminates the need for many truck journeys
After a year of construction, the facility of the Donau-Riedlingen wastewater association goes into operation
Swabian newspaper May 28, 2011

Outwardly, it is reminiscent of a greenhouse, reduces the weight of the sewage sludge to be disposed of from 4200 to 1900 tons per year and reduces its volume by two thirds: The solar sewage sludge drying of the Abwasser Zweckverband (AZV) Donau-Riedlingen makes many truck trips from the sewage treatment plant to the waste incineration plant superfluous . This lowers the CO² emissions. The system uses the sun's energy for this. "We are thus demonstrating sustainable action," said AZV chairman and Mayor of Uttenweiler, Wolfgang Dahler, gesturing at a celebration with members of the association's assembly, representatives of the companies involved in the construction and employees of the sewage treatment plant.

One year after the start of construction, Dahler pressed the start button, but "the trial run has been running smoothly since the end of March".

Read on in the entire article ...

Wieseverband saves energy through solar energy
Oberbadische Zeitung May 28, 2011

The Wieseververband, which is responsible for wastewater treatment in the region, invested around 2.4 million euros in 2008 for the construction of a solar drying system on the site of the Bändlegrund sewage treatment plant in Weil am Rhein-Haltingen. It dries the sewage sludge from wastewater treatment. Drying significantly reduces the amount of sludge, which makes disposal cheaper. In 2010 the Wieseververband achieved savings of around 220,000 euros. "That is almost the same amount that we achieved in 2009 and again exceeds our expectations", says Robert Schäfer, Managing Director of the Wieseververband.

Large-scale solar sludge drying in Managua / Nicaragua
Dipl.-Ing. Ulf Meyer-Scharenberg; Dipl.-Ing. Marcus Pöppke
WATER AND WASTE 01/2010 page 26

The wastewater from the capital Managua has so far been discharged untreated into Lake Managua. Often referred to as the largest wastewater lagoon in the world, this lake was on the verge of ecological collapse.
With funds from German development aid, a sewage treatment plant was built for the megacity of Managua. Planned by the Fichtner office, financed by KfW, it was built by the British company Biwater and put into operation in 2010.
Approx. 26,000 t are produced each year, which is reduced to approx. 10,000 t through drying. The end product is then available to agriculture as a fertilizer, but could also be used as fuel for energy.
This flagship project received the award for a particularly environmentally friendly contribution in the internationally highly regarded competition “Global Water Award 2010”. The Queen Noor of Jordan jointly presented this award to Biwater and IST-Anlagenbau GmbH in Paris on the occasion of the annual project competition.

Solar sewage sludge drying in practice
Experience at the Glarnerland sewage treatment plant
Hans-Rudolf Doubt; Otto Fischli; Herbert Brauchli; Patrik Herrmann
gwa 7/2001 of the Swiss Gas and Water Association, Zurich

The ARA Glarnerland annually produces around 4,000 t of dewatered digested sludge (dry matter dry matter 25%), which is disposed of by incineration in the waste incineration plant.
ARA's new solar sewage sludge drying system uses solar energy and the waste heat from the combined heat and power plant to partially pre-dry the digested sludge. The digested sludge is pre-dried from 5% to 40-50% dry matter in two halls. After one year of operation, it was found that around 600 t of water could be evaporated and that the company's own waste heat was effectively recycled. The number of road transports could be reduced by 40%, and this resulted in a strong reduction in disposal costs.

With the power of the sun (special edition Entsorga Magazin)
Solar sewage sludge drying in northern Germany with opportunities
Martin Wittmaier, Jens Uwe Meyer, Björn Sawilla
Entsorga magazine, issue 06/2006

The disposal of municipal sewage sludge will increasingly take place through thermal treatment because of the ban on landfill and the restrictions on agricultural use. Against this background, the upstream sewage sludge drying will gain in importance. The drying process significantly reduces the amount of sewage sludge, increases the calorific value and makes transport and disposal cheaper overall.

"SolarMix" - Innovation in Drying Technology (Australia 2005)
Nathan S. and Clarke B.
1. CabWater Caboolture Shire Council; 2. Arkwood Organic Recycling Pty Ltd; 3. Mixwell Specialized Transport Pty Ltd

The first "Wendewolf" system in Australia was commissioned in Burpengary, Caboolture north of Brisbane in July 2003. The system consists of a hall measuring 12 x 100 m and runs in throughput operation, i.e. the sludge throughput is continuous without storage. In summer more is dried in winter less. After a dwell time of around three weeks, the sludge is automatically discharged to the side with a belt conveyor. The system was measured in detail in 2004 with regard to the evaporation capacity and the reduction in the number of germs. The average evaporation rate is 9 kg / m²d, which is roughly three times the value achieved in Central Europe. The reduction in the number of germs is so strong, depending on the length of stay, that the dried sewage sludge is classified as class A biosolid.