165 lines
4.6 KiB
Plaintext
165 lines
4.6 KiB
Plaintext
are Ha ha (I745 a.l in siae,
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Ponds can be born as rhey are as Wei-diner ro iau by
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grisviiy llnw horn one lo lhe olher. In lhe hrsi series oi
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lselllingi ponds, she sludge {wiles an ANAEROEIC
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condlrion ln ihe nexl series oi ponds, some sludge
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passes over and beeornes anaerobic al ihe pond base,
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while his suriaee waier in the pond idue io Wind or
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algnel is AEROIHC (oxygeneprodueingi The iinal
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series or ponds u lolally aerobic Thus, iroui inrahe so
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oullee, we have ihelcrms
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. ANAEROBIC. or meiiianeproducing idigesler
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sl
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- FACULATIVE, or parl melhane, pail oxygen.
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producing.
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- AEROHIC, oroxygen.produeing pon .
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Ponds ai Wembee are only an average oi i rn (3 leer)
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deep, Deeper, and lhe sludge breakdown and wind
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aeralion eileeis are less.
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One ihoiisand lownspeople and iheir associaied
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induslries rlieieioie need as liirle os :70 merrea )qm
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of seiilirig pond I m deep. We eould, in iaci, achieve
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ride as long“ pond (or series n! ponds) 3 m wide x so
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in long, or 3 sidebyoide ponds so in ionic and 3 m
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wide, or any such combinaiion We can halve ihelengsh
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by doubling lhe depih lo 2 in and per a pond 3 m x 45
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in long, or lreble “m depih and condense ihc pond area
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reaamdeepxsmWidexJam long -digesler pond.
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Such a long and numw pond is easily made reiaiiy
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anaerobic by lining wales seisls ind . weighied (am
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over lhe iop iwliich can be oi plaszis, meial, bulyl
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rubber, or hbreglassi. Nam ihai ior ihese deeper
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digesier ponds we would need roiiriifrcirliyrgiiole lhe
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sludge luélng pumped bioges io sii ill, Dthzrwlse n
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senies and becomes Inldw! irigiire ml
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sludge is "inlvc' only in coniaci wllh Lb: Sum—Ilquld
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inpuis oi rhe sewer, lhus when we siir iip m: sludge.
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lhe beiier we break down lire sewage to biogas,
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Almlher icriiieall beneiil in sealed and agllared
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digeslers is rhar no 5(llm iorins on lhe pond suriisse,
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which can slow ihe breakdown process lurlher and
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sausean acid condiiion,
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oi lhe ioral dissolved solids (or innuenil enlenng
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such a digesier, over a pe 'od iii 20 days and wllh a
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lernperaiure or zs-wc i77-lb-rl, a very high
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percenlage oi ihe mass is iransierred inio mellone, a
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small proporuon is also passed on io oiher ponds, some
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as living cells ibacieria or algae: As melhane forms, so
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lhe oxygen demand oi the eilliieni ialls; aboiii a cubic
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melre oi melharie generaied removes abour m lrg oi
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solids, reducing biological oxygen demand loom w
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lhal exienl
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in lhe digesier, 9mm. oi worm eggs are desnoyed.
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as are many harmiui bacieria liseiul energy is
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generalzdi and can be used or rhai loeaiion ro run a
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molor ior eieclri , or to compress gas ior cooking or
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machinery lor bolii, as power demands vary> nus
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more. borh supplies lhe heal ior lhe digesler process,
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and also compresses lhe gas ior digcsier agiiaiion, and
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ior energy supply
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Whal happens n lhe digesrer2 lhe marsh gas
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mu 1.:
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ANALVSIS 0F RAW SEWAGE
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ANALYSIS
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souns
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Tum dissoived Wlds hm (rosy
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lsiiooioal oxygen demand we - 5m (non)
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suspended sold: lsa . dzo
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Velauialiouidd lea-5w
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Tomi moaniccamon lib—add
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Anionic siinoelame I o e a d
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NUIRIEMTS
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Nilma as N mos
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Nilroro as N ii i e as
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Ammomn as N g-g‘z
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anic ll -
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mi N s - 55.2
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omiepliaiphale as F 1,5 —s.n
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Yaw phosphorus I 5 .9,n
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Wm
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Cowl! 0.09 - n45
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cniomiiim o 25 70.4
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Cidmlllm 0 cl 5
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lion l s - 3 3
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Lead 0 3 e o 4
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Mon-airy am:
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Moi-i o l5
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zirrs a l e mi
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coloun
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1:: PVC}: urinal loo -:loo
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9" as 1 2.u inear nlllmll
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01 in. low sonsp. inbol iiom 45‘ Bu '1. oiine
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volume builds up as siiidg in sohlirio ponds
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produced, hydrogen sulphide (Hps), combines wiih any
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soluble iorrns 0! heavy melals iii produce sulphides,
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mind are insoluble in waiec above pi-l 7. A hole lime
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can also adueve or assisi mis resull.
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Hussarny lound lhai ihe iollowing iesull owned in
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anaerobic ponds (see original meial conlenl, Table mi:
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- Copper is removed was, 0! which 737. was re
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moved anaerobically.
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. Cidnullnl is removed 705., all anaerobically,
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- zincis removed mews removed anaerobically.
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- Nickel is removed 555.47% ambically
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- bead is removed 95%,90'1, anaembioally,
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r Chmnuum is removed 37%, m. amembuafly.
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- iron is removed 35%, mi anaerobically, ilip m we
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oi iron was removed by lhe loculaliye pond prooas,
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lrul some iron was plflly dissolved in lhe aerobic pond
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sgsin, toyve “1:857- quoiedl
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The resulrs are ihar solids, rnelals, and disease
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organisms are very greally reduced by lhe hrsl
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ianaeiobiei oeoirneni oi sewage. Whal, in (ad, happens
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lo the sludge: il becomes meihane in an anaerobic
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shallow pond, or a deeper agilaled pond, lhe more
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sludge, lhe more aclive rhe pond nus. is sei/erryiiiaied
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eooiiihriiirri ioridiiiori soon esialiishes where inpur
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balames gas oiiipiil ii we remove ilie sludge, ihe
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process slows down or stops This is a clear case oi
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175
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