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BS 5950-1:2000
— Part 1: Code of practice for design — Rolled and welded sections;
— Part 2: Specification for materials, fabrication and erection — Rolled and
welded sections;
— Part 3: Design in composite construction — Section 3.1: Code of practice for
design of simple and continuous composite beams;
— Part 4: Code of practice for design of composite slabs with profiled steel
sheeting;
— Part 5: Code of practice for design of cold formed thin gauge sections;
— Part 6: Code of practice for design of light gauge profiled steel sheeting;
— Part 7: Specification for materials, fabrication and erection — Cold formed
sections and sheeting;
— Part 8: Code of practice for fire resistant design;
— Part 9: Code of practice for stressed skin design.
Abstract--COD and nitrogen balances were performed on four different types of laboratory-scale activated sludge system: aerobic, anoxic, anoxic-aerobic and anaerobic-anoxic-aerobic (biological excess phosphorus removal systems). The systems included a variety of configurations, with differing wastewater characteristics and operating parameters. The results suggest that good COD balances are to be expected in aerobic and anoxic-aerobic systems. Systems incorporating anaerobic zones exhibit low COD balances (less than 80%). Fermentation in the anaerobic zone apparently is implicated in this "loss" of COD. The consequences of the COD "loss" include both a significant decrease in oxygen requirements and in sludge production compared to aerobic or anoxic-aerobic systems. Possible mechanisms for the loss of COD and areas which require further study are discussed.
