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PL275047A1
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Method of purifying dreust carrying gases
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PL254659A1
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Method of thickening waste water sludges by flotation
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PL254660A1
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Method of stabilizing and dewatering sludges
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CA1093716A
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Biological sewage treatment plant
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ES472415A1
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Improvements in the plant of biological treatment of wastewater (Machine-translation by Google Translate, not legally binding)
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DD137917A5
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Appendix for biological cleaning of wastewater
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DE2831781A1
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Biological sewage treatment tank - with fixed and moving aprons dividing bio-sorption from bio-stabilising and settling stage (PT, 27.4.79)
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CS205130B2
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Device for biological treatment of waste water
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