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influent cod
Only 2.5-8.8% of influent COD was converted to hydrogen and methane.
      
Wastewater composition was changed by adjusting influent COD/N/P ratio between 100/7/1-100/15/1.
      
The results showed that the nitrification and percentage of COD removal were not affected up to the value of the COD/NH3-N in the range from 47 to 23 at w=6?rpm and for an average influent COD of 1003?mg/l.
      
The influent COD concentration was varied in the range of 1500 to 16500?mg/l, at different hydraulic retention times viz 36,48,60 hr.
      
In the case of constant influent chloride concentration of 4000?mg/l and at an increasing influent COD concentration, the toxicity due to tannin on anaerobic contact filter was observed at 1180?mg/l.
      
The results showed that at 4?d HRT the overall COD removal percent ranged from 98% to 73% for an influent COD of 1500?mg/l to 19,000?mg/l.
      
Continuous experimental results demonstrated that 80% nitrogen was eliminated when the influent COD loading ranged between 2.06?g and 3.92?g COD/m2?day.
      
The reactor was sensitive to variable influent COD concentrations, but the stepped-loading aided rapid recovery from transient organic loading shocks.
      
Anaerobic filter removed up to 70% of the influent COD concentrations at organic loading rates (OLR) of 9.5 and 14.3 (g/l d) and sulphate up to 80% at OLR of 7.1 and 14.3 (g/l d) whereas the pH ranged between 7.0 and 7.5.
      
The compact biomass structure allowed halving the settling time, the initial reactor volume, and doubling the influent COD concentration.
      
Increasing the influent COD had a slight effect on NTA removal.
      
Increases in influent COD combined with transient temperature reductions also caused a significant reduction of NTA removal.
      
Domestic wastewater with an influent COD of 160 to 327 mg L-1 was evaluated for treatment by the Biofilm Airlift Suspension-reactor (BAS-reactor).
      
As can be seen, increasing the influent COD concentration altered the aspect of VFA evolution.
      
Figure 3 also displays the relative removed influent COD for different ratios of food to biomass documenting the good degree of elimination.
      
For this, the dosage was calculated as dosage per g of influent COD and the turbidity removal was presented as a function of this ratio.
      
However, this reactor cannot attenuate the imposed fluctuation in the influent COD.
      
Influent COD loadings had increased nearly 75% in two years, and influent BOD loadings had increased by 100% over the same period.
      
In steady-state operation, 20-30% of influent nitrogen was emitted as N2 O in the bioreactors with influent COD/N ratio less than 3.5.
      
Laboratory-scale sequencing batch reactors were operated at several influent COD/P ratios to obtain sludges with a range of phosphorus contents.
      
 

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