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t1'o Ui ons;lc vvasteP.F[bf aeratioeequipmcnt that are retrofitted into un existing septic tank. Alrl-nurh the performance of d,e spsteln i somewhat variable between sites, it has been of fecrn c for both BOD and nitrogen reductioza. The Pirana slstcrn is also inoculated with proprietan' bacteria. fheAdvanTex systenn is essentially a compact vert-hih surtace arca>yndnetic u-icl,lin,filter systcmn The Ad-,anTex system produces nnore consisCent el duetatOuaHtyr than [lie Pimm, but is an above-«ound extcnnal package s-stcm that would require a second Pump vault. The AdvanTes is also designed around lower strength effluent and could e::hibit excessix-e bi(lntncal gro" th,ploggina the filter fabric. The Nibbler system consists of floating plastic media in "hods" installed in a reCtanguhu tank. '1n external air pump provides oN gen to the Nibbler tank. The Nibbler systerrralso requires a clarification tank and a sludge recycle pump. The Nibbler system has proven relmbihi)- with high stren4dn wastewater. It was initially expected that the Pirana sstem would be the lowest cost system for additional treatment. However,after further review and discussion with die manufacturer, it became apparent that the costs of cutting tlne concrete pad to install air and power lines could raise the overall costs to around $15,000 to $20,000. Installed costs for AdvanTex filter units would also be approximately$20,000. Total costs- for the Nibbler system would be in the $20,000 to $25,000 range. The Nibbler system would probably be most appropriate for reducing effluent BOD strength. Additional detailed evaluation of all three alternatives together with the existing system should be performed prior to selection of a particular system. It may be possible to optimize one or more of the alternatives through better use of the existing secondary septic tank. 4.4 Other Operational Cors.ideraticns The Infiltrator system should be rested periodically (one week per month) to help maintain percolation capacity. 5 . SUMMARY AND CONCLUSIONS The low percolation capacity of the primary dispersal field is most likely due to soil sealing caused by construction in wet, muddy conditions. The dispersal field should be reconstructed. Chocoholics should give strong consideration to additional secondan-treatment to reduce effluent BOD levels. With lower BOD, lesser regulatory requirements may be possible. _ 6 . REFERENCES Chesney Consulting (_002).aratr l�naa nig P-(:; f °.,z/u: r...r` . `f r;ar L'ed�n. Prepared ft Schenone Specials Foods Company Chocoholics Divine Dcsserts�December. Crites, R.W'. and G.T. 199£S). Sn f i :r:,-',De,.<nb;u.-ed ld",ar,e»razr 11�raap,:an��trF S_7,"v'v. %X'CB/hlcGraw-Hill,Nev, York. Nolte rciates, Inc. 200 l..r.Sinfsa f.;�f u�f,:i.r 1 eng.-, m F.q`or;of If Prepared for ChocohoLcs Divine Desscris. Nurenaber. 7