homes al >05 ppm can (lube massive Wan cumin
nauon m sods, and ulme Ll) ppm n lunnlul lo soll Me
and plants Thus, we need lo use plaln soaps on mp ll
posulsle, and mule more complex pollulanls m nee
sys|rms (well-mommred), as woody ptrznm-Is can
cope benn man gardzn vzgel-hlu, and allow more
nme Icrdzcnmposlhon ollang—lenn pollulims.

ln mueal mas, and espedauy in avid nr delleal.
envllvnmenls, we may need lo aeale bum spoelal soaps
lunpouuled ods, polasn or sodium and plam speoal
exops whxdl remoye ease-us lmany waler planlsl
belole pisimg on gxlywaler lo lhe sods and sneanu
Th: no blanket polley. only spenne cnws when we
on expect to 5am yleld and also clean up waler If we
know me eomponuon ol soils and soaps

 

75

THE PURIFICATION OF PDLLUTED
WATERS

rne mlly Icngrlzml .nsuxanse ol good wam supply lo
a selllemenl .s by Xlgomus eonuol ol a [ornsled
enlelunenl, Inclndlng a |o|a| ban on uloeldes and
meullic ploeessmg. As lneae me lew such elean areas
lell In due wand, nouse wool lanks must do [or me
loseseeable [Mum 'l’he 30—40 addluyes (ammnnly
mooduced uno walee supplles me onen pollulanls m
lhemselves lo lnal muezsmgly senslllue senor ol
socluy devdupmg allergles lo any lype 0! modern
po||ul2nL Thy nddmves Npmsenl lne end poml ol
lne technologlcll [IX polluuon ls “llxed‘ by lunhu
pollulion

Hereln, I will stress on mulogual uealmenl ol
mmnmncunl-mminu, me only waler sale loaus isalm
me [or on." llvlng llnngs. For nulluua we have
sxlsled on walex supplies eonlanung neallny plans and
fish, and .l we keep namnl wine's (me ol laeeal and
.nduslnal eonumlnams, we an eonunue lo do so ms
ii not so much a miner ol Wiler uealmenl, ns lne
paeyenllon ol polluhng amwnes.

However, luv many ("sling clues and lowns, sewage

and slamwakr supp cs muse eonunue lu leplesenl a
-disposal pmblpm“. A! me waslewalers ol upaneom
selllemenu alo me dunking waters or downsneam
nus, aux duly ‘5 lo alas: lnam any selllemenl only
wales of sumnemly good quahty Io be sale|y useaole
by olnen.

The problem contaminants .nosl llke‘y lo alleel
dnnhng naler ale

. TURBIDITV. sul and tuna pameles suspended .n
th! water,

. BACTERIAL or ORGANIC polluuon [mm sewage.
and as de<ay ploduels. e g r on, dlsease orpamsms
and viral or pmmvoan palhoge’ns, parasmr worm Eggs
and so on

- METALLIC POLLUTANTS such as (hmmlum.
eadsnluln, lead. mury

. alochE. e , Aldrin, nleldnn, 2. H); 2. 1.5T;
dmxm, PCE. :Ic lorganaphosphalcs, halogenaled
nydmeaxbonsl

- sxcesswz FERTILISER, espmally m|m§umus
eompouods. pnuspnales, sudlum and polasnulnsaln

. ACIDS or dude/omunp (Dmpounds «a pH less
man s 5 mouse: melallle pnllunnnl

Many ol lnese laelnrs lmencl Acid mil dlssolyes oul
ol rotks and soll polsonous [arms 0! alumlnlum,
mtrtuw, lead, cadmlllm, and selonlum, or olnu mails
suen as copper, nKkel, and lead lmm dnnkmg mulls,
lea urns, and hot wakr lanks Drgdnlsm: may eonyen
lnuxgamt mzxury m naymc lonns las happened m
Mmaanala, lapanl mm are readllv ansonaed by me
body. Sewage m waver alds «uen conversion lo
olologlcally amve metals.

Memflk lunglnde dmsmg on seeds has nol only
caused dneel paiwnmg at people Mm haw ealen lne
seed, oul also poisons lne sod Excesslve amllelal
lemme! "messes aquaue .ologleal aenvuy, wluen
resuks m lunher uplih: ul metals m node was, and
so on. ln blondts, Aldnn prevonls DDT bang exmled:
lne (umbinalmn IS deadly lone (an nuy Inn mix .n
Auslralla and me mud world, ur [Anne's will aelueye ll
by sueeesslve spray, um ls n slable lesldunl pmson
eodsnlllnp wlln waler, so ma. dlsllllalmn wlll nol
nelpl. An adduloual lhmal lo publle nenlln cnmes lmm

 

 

    

FIGURE 1.3!

 

Hmumsln FLUSH mllns
wmv uu ln ninnhumslmu‘ equals um lnr um; so u- «an nu
mu, m than. mm o used m loans. nnlomu unx can mun
um mum and mess firm! In Inlll'l

   

 

172