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  1. ed666

    structural strenght of slotted screen

    Hello, we are looking at building a new batch pulp digester to replace our venerable almost 100 Y old ones. The original sulfite digesters are made of 'black steel' lined with brick. We will replace one of them with 2205 SS. The new digester will a bit different and we will try it for few...
  2. ed666

    Phosphorous uptake for anaerobic sludge in WWTP

    Hello I run an anaerobic treatment for some of my pulp mill effluents (Paques IC reactors). The problem we have is that the biomass does not seem to assimilate the phosphorous. Our bugs are always low in phos content. The plant operates not too bad but we also have difficulties to grow...
  3. ed666

    Paved sludge storage area

    Hello I need to build a paved storage area for WWTP sludge. I will have all organic soil removed, have base material and pavement. What is the recommended thickness, type of material under the pavement. note that there will be heavy loafers and dump truck going into this area, we have...
  4. ed666

    Zinc removal in the effluent of a galvanizing plant

    We got good results by controlling the pH to 9.5-10 (in a settling tank and taking the solids out to to a filter press) for removing the zinc from the effluent. we were able to achieve 0.1-0.5 mg/L which is quite good (reg is 1 mg/L). We plan to modify the plant and we will double the flow...
  5. ed666

    Effluent pH control with sulfuric acid

    Here is the situation: 1. Process changes require to modify pH control from a caustic injection to an acid base system cause the nature of the effluent will be affected 2. i need roughly 60 kg/d of H2SO4 (97%) to treat about 75m3/d in order to neutralize pH 10 effluent. very low flow... 3. H2SO4...

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