survey on monitoring results

Summary

The crucial feature of a minimum level of reliability of wastewater treatment is the free wastewater flow passing the primary treatment (primary treatment independent from energy supply and failures of electrical/mechanical equipment). Additional reliability of the treatment performance is achieved by biofilm systems with free flow (compare Geraer Refuge: 75 % COD-elimination despite a break-down of the energy supply and consequently no recirculation for 3 weeks in the season 2001). Generally most of the failures in performance and problems in operation of the monitored treatment plants have been occured due to troubles in the energy supply: faulty inverter at the Karlsbad Refuge, defective charger at the Nördlingen Refuge, destroyed solar collector at the H.v.Barth Refuge, “energy-competition” between kitchen and WWTP at the Magdeburg and the Brandenburg Refuge.

The installation of an autarkic energy supply system exclusively for the operation of the WWTP causes additional chances of defects and maintenance failures. On the other hand an integration of the WWTP into the total energy concept of the refuge means a competition with other energy consumers.

Frequent failures in the operation of the monitored activated sludge systems have been caused by the pressure-sensitivity of the applied linear-compressors. Therefore at WWTPs with water depths well above 2 meters the compressors had to be replaced. Some activated sludge systems showed problems in holding a sufficient high sludge concentration. A careful adjustment of the operation cycle (time control) and the mechanical equipment was required. Carbonate dosing promises additional improvements (compare chapter about specific issues).

Survey on monitoring results

	LIFE - Monitoring 1998 - 2001	proper WWTP performance at following dates
Nr.	WWTP	(bold numbers = legal requirements not met)

1	Adolf-Pichler Refuge	compackt trickling filter
	monitoring date	26.9.98, 27.9.98, 1.6.99, 5.6.99, 9.6.99, 20.6.99, 25.6.99, 26.6.99, 27.6.99, 28.6.99, 2.8.99, 25.8.00, 14.7.01

2	Berlin Refuge	Biocos-system
	monitoring date	21.7.99, 24.8.99, 9.9.99, 13.9.99, 25.6.00, 26.7.00, 27.8.00, 5.9.00, 3.10.00, 18.7.01, 22.8.01, 24.8.01

3	Brandenburg Refuge	composting toilets
	monitoring date	25.7.99, 23.8.00, 17.9.00, 6.8.01

4	Breslau Refuge	filterbag system
	monitoring date	19.8.98, 9.8.99, 15.8.00, 28.8.01

5	Brunnstein Refuge	soil filter
	monitoring date	24.5.00, 8.5.00, 31.5.00, 16.10.00, 22.7.01, 18.8.01

6	Coburger Refuge	Biocos-system
	monitoring date	29.7.99, 18.8.00, 20.8.00, 8.9.00, 22.9.00, 27.9.00, 21.7.01, 8.8.01

7	Darmstadt Refuge	filterbag system
	monitoring date	11.9.99*, 11.8.00, 12.8.00, 19.7.01

8	Essen / Rostock Refuge	SBR-system (operated during winter season)
	monitoring date	24./25.3.00, 9./10.8.00, 8./9.5.01, 1.7.01

9	Geraer Hütte	soil filter
	monitoring date	19.8.98, 11.9.98, 23.6.99, 27.6.99, 4.7.99, 11.7.99, 26.7.99, 25.9.00, 21.9.01

10	Hermann v. Barth Refuge	mechanical solids separatoe and natural soil filter
	monitoring date	21.9.98, 5.9.99, 9.9.00, 10.9.00, 23.8.01

11	Höllentalanger Refuge	Biocos-system
	monitoring date	8.8.00, 22.9.00, 9.10.00, 10.10.00, 13.7.01, 9.8.01

12	Karlsbad Refuge	ESB-system
	monitoring date	9.8.00, 8.9.00, 6.10.00, 23.7.01, 11.9.01

13	Karwendel Refuge	Biocos-system
	monitoring date	31.7.98, 16.9.98, 26.8.99

14	Konstanz Refuge	Biocos-system
	monitoring date	6.8.99, 12.8.99, 14.9.99, 17.8.00, 25.9.00, 17.6.00, 7.9.01

15	Lamsenjoch Refuge	Biocos-system
	monitoring date	1.9.99, 26.7.00, 17.8.00, 28.8.00, 12.10.00, 17.7.01, 10.10.01

16	Magdeburg Refuge	pond and soil filter
	monitoring date	24.8.00, 22.9.00, 9.7.01, 20.10.01

17	Meissner Refuge	ESB-system (operated during winter season)
	monitoring date	13.7.98, 3.10.98, 4.10.98, 5.10.98, 14.3.99, 26.8.99, 15.12.99, 25.3.00, 21.6.00, 18.10.00, 25.3.01, 28.9.01

18	Nördlinger Refuge	Biocos-system
	monitoring date	15.8.99, 2.9.99, 12.9.99, 23.8.00, 18.9.00, 6.10.00, 27.7.01, 6.10.01

19	Porze Refuge	trickling filter and soil filter
	monitoring date	9.8.00, 8.9.00, 22.7.01, 11.9.01

20	Rastkogel Refuge	Biocos-system (operated during winter season)
	monitoring date	5.5.00, 13,7.00, 30.5.00, 14.10.00, 25.5.01, 13.7.01, 1.10.01, 20.10.01

21	Stuttgart Refuge	ESB-system
	monitoring date	2.8.99, 6.8.99, 14.8.99, 14.9.99, 4.8.00, 27.8.00, 26.9.00, 19.7.01, 24.8.01, 21.9.00,

22	Taschach Refuge	SBR-system
	monitoring date	11.9.98, 6.9.99, 1.8.00, 15.8.00, 28.8.00, 3.9.01, 20.9.01, 9.10.01

28. Mar 2002