129 lines
3.4 KiB
Plaintext
129 lines
3.4 KiB
Plaintext
loose pebbles (2 sem elnl ean be used lo lorrn on aeuue
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baelenal surlaee layer ro almrb nulvimls, men a sand
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lrlrer ean hr used so absorb bael pollunon Waler
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nsrng lnmuglr a sand mlumn rs Imrly clear
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the shells ol Mme? mussels ean be subsruured lor
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penbles, and me luung rnussels m rne pond or tank nor
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onlr murmur nnduy ldylng al pll 5,5 or llnereoboursl
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bur llhcr, lndludumlly, up ls. IDD l/da), drgosnng
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baelorra and deposrlrng wasles m rne rnud base.
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Vlussels and cravhbh are um only suesepuble to low pH
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bul are also eery sensuue l.» bleeldes snd‘ as meldrrn,
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so lbal llrerr ln-rng presenee ls a (unshnl nrnnudr on
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lrlelnnalonrng pollnnon
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Wawr, now lauly elean, ean be passed rlrrougn a bed
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5' uarerel-ess lo rernoue dyes and nrrrales. and rlneeress
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cu! and led re anunols or dned and burnl ro ash As a
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lrnal prneess, llne nakr ean be rrlekled lnrougn a
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mlumn la eonenue pipe on end» o1 lfln‘e earbon mm
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and srllrou dloxidz 490M, mnemse known as burm
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nee, oar, or whoa: nuslo
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me resulls should be eleae, spiyklmg, sale warer lo
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drink No mazhlneryl "valved u are syslern rs lard
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our downslope lo penuu gnu/fly flow
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l.rrne mesnly bum) ls ollen used lo mnmve pubs.
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plum» and sludges ln a primary sellllng Iagnon, and
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men water ls passed k) a thkle rower ler arnlnorua
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removal by baelen-a ln rowers, ol eourse, llre baelerla
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are run runner eonsurned, bul m open lagoons a normal
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teed eyele (akes plaee, with mymd .nseer larvae and
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llllerrfeedets mmuvmg order. and Imgs, llsh. and
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waredowl eauag me rnseels. ln srnall mwns, me waler
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ean be parsed lrorn lrlrer lowers |n sewage lagoons,
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wruen m lael may beeorne rreu warerlowl and soresr
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:innuam: ll ean rhea be mulnd lo lreld erop suen as
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loresl, paslure, and to crops lu be drsrrlled nr huml,
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which does run dlmdlv Nuke! llre mod enarn
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Sewage Trealruea slag Nanaral mm
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Raw sewage ls a rnrxrure ol numerals, elemenls, heavy
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enerals, and earbon compounds, ll also cnnlams oune
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dangerous levels 0! baelerra, ‘ruws, and lnlesl al
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warm eggs A lypleal analy. ls grven m Table 7.3
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Unlrs are as rng/ , samples are 0! m rnduslrul, sum
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denresne wssles al Werelbee, vmorra, Ausrralra
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lHussarney, Melbourne Metropolitan Warer board
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rubs, lml
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Melbourne 15 a (My 01 z,7un,mm people and us
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sewage lagoons com 1500 ha moo a l nus, llrere rs
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one neerare ol pend (In eorall in lbw runabuarus (or
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aboul l a lor szu peoplel, In use ponds, mw sewage rs
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run lnlo abmn m h: H.790 a l. wlrere II senles oul
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Eaelr ol Ihzse pnmary seuluue ponds rarely exeeed 7 na
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n7 a ) rn area, so aboul lllo pends Raw: and senle all
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raw sewage Sealed down, ms rneans l m as a l 0!
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sellllug pond '0 3m people
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All anose selrlrng ponds are anaembre, and glvz on
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broges, a nuxture ol rrrellnane (cm, earbon dioxide
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mug and amrnoma gas mud, wun rrases ol mlms
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snlplude or rnarsln gas (N01) blagas rs, 01 eourse. a
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uselul ruel gas loeengrnrs, ora epdlung gas lor hams
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However, .r rs also a gaseous eornponenr or llne alrnos
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plnere um 15 nearing llre 'gmdwnse erleer and lnus
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should be used, wt released roair.
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me nex| sel o: ponds rs laruiillve (is described
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belowl and the lasl set aeroble These, in renal, sllgnlly
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sourced rne area ol «he ammblc or selrllng ponds. Most
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sermon», 5ND
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aevmw
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m lmmw
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news arouses)
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mum! 7.3:
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scummc or sswmz Palms to :ch
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na mlnus enenmupnuzm smerns
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m
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MN: m serum m. up»
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A.” earea em as “.0
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a
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seq-lower, ELEM‘HGM
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174
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