Aj napriek ukon\u010deniu prev\u00e1dzky t\u00fdchto z\u00e1vodov pred viac ako p\u00e4\u0165desiatimi rokmi zostali dodnes tieto zne\u010dis\u0165uj\u00face l\u00e1tky, predov\u0161etk\u00fdm PAH a\u00a0Arz\u00e9n, ulo\u017een\u00e9 v\u00a0dnovom sedimente spomenut\u00fdch vodn\u00fdch pl\u00f4ch a\u00a0aj na\u010falej predstavovali riziko pre \u017eivotn\u00e9 prostredie. Obzvl\u00e1\u0161\u0165 preto, \u017ee jazero Tisaren je zdrojom pitnej vody pre okolit\u00e9 obce. \u0160v\u00e9dsky Geologick\u00fd \u00dastav (SGU) sa rozhodol t\u00fato environment\u00e1lnu z\u00e1\u0165a\u017e odstr\u00e1ni\u0165.<\/p>\n
Na\u0161a spolo\u010dnos\u0165 uspela vo v\u00fdberovom konan\u00ed na realiz\u00e1ciu odstra\u0148ovania kontaminovan\u00e9ho dnov\u00e9ho sedimentu v \u00c5sbro s jeho n\u00e1sledn\u00fdm odvodnen\u00edm v geotextiln\u00fdch vakoch. Hlavnou v\u00fdzvou pre n\u00e1\u0161 t\u00edm nebol vysok\u00fd objem \u0165a\u017eby, ale vysok\u00e9 po\u017eiadavky na presnos\u0165 \u0165a\u017eby, sledovanie GPS miesta a h\u013abky \u0165a\u017eby. N\u00e1ro\u010dnou \u00falohou bola realiz\u00e1cia \u0161tetovnicov\u00fdch stien za \u00fa\u010delom viacn\u00e1sobn\u00e9ho prehradenia toku, a to najm\u00e4 kv\u00f4li obmedzen\u00e9mu priestoru na manipul\u00e1ciu\u00a0 a celkovej zlo\u017eitosti situ\u00e1cie ktor\u00e1 neumo\u017e\u0148ovala pr\u00edstup inej be\u017enej techniky \u2013 z brehu ani z vody.
\nRealiz\u00e1cia pr\u00e1c za\u010dala v septembri 2021 in\u0161tal\u00e1ciou nepriepustnej f\u00f3lie v pripraven\u00fdch baz\u00e9noch s celkovou v\u00fdmerou cca 2,5 ha. Nasledovalo prehradenie toku Estabo\u00e5n a odklonenie toku do HDPE potrubia o priemere 630 mm. Prehradenie a odklonenie potoka bolo do\u010dasn\u00fdm opatren\u00edm na dobu trvania realiz\u00e1cie \u0165a\u017eby. Cie\u013eom opatren\u00ed bolo zabr\u00e1ni\u0165 distrib\u00facii nebezpe\u010dn\u00fdch l\u00e1tok rozv\u00edren\u00fdch do vodn\u00e9ho prostredia po\u010das bagrovania sac\u00edm bagrom. Za rovnak\u00fdm \u00fa\u010delom bola na jazere Tisaren in\u0161talovan\u00e1 norn\u00e1 stena a sorp\u010dn\u00fd had s obvodom cca 1 km. Pr\u00e1ce skomplikoval n\u00e1hly pr\u00edchod mrazu, faktor ktor\u00fd pozastavil pr\u00e1ce na skoro 5 mesiacov. N\u00e1\u0161 t\u00edm na\u0161\u00edm\u00a0 spolu s na\u0161im najv\u00e4\u010d\u0161\u00edm sac\u00edm bagrom DredgeKing PERM od\u0165a\u017eil a n\u00e1sledne odvodnil v geotextiln\u00fdch vakoch cca 16.000 m\u00b3 kontaminovan\u00e9ho sedimentu z celkovej plochy cca 20.000 m\u00b2 (4.000 m\u00b2 Estabo\u00e5n, 15.000 m\u00b2 vonkaj\u0161ia oblas\u0165 jazera Tisaren).
\nVoda poch\u00e1dzaj\u00faca z procesu odvod\u0148ovania sedimentu sa n\u00e1sledne prefiltrovala cez GAC filtr\u00e1ciu (akt\u00edvny uhl\u00edk) a vr\u00e1tila naspa\u0165 do jazera. Po\u010das \u0165a\u017eby sme denne monitorovali hodnoty turbidity v \u0165a\u017eobnej oblasti a jej okol\u00ed. Z\u00e1rove\u0148 sme na t\u00fd\u017edennej b\u00e1ze odoberali vzorky filtr\u00e1tu pred GAC filtr\u00e1ciou a za \u0148ou, aby sme mohli monitorova\u0165 \u00fa\u010dinnos\u0165 filtr\u00e1cie na PAH. Uhl\u00edkov\u00e9 filtre dok\u00e1zali zn\u00ed\u017ei\u0165 obsah polycyklick\u00fdch aromatick\u00fdch uh\u013eovod\u00edkov z 320 ug\/l na 0,01 ug\/l a obsah arz\u00e9nu z 15,2 ug\/l na menej ako 0,2 ug\/l. Po ukon\u010den\u00ed \u0165a\u017eby dnov\u00fdch sedimentov si projekt vy\u017eadoval e\u0161te filtrovanie vody z ka\u017edej oblasti \u0165a\u017eby cez GAC filtr\u00e1ciu, k\u00fdm hodnoty PAH neklesli na po\u017eadovan\u00fa \u00farove\u0148.<\/p>\n","protected":false},"excerpt":{"rendered":"
Prev\u00e1dzky v dvoch b\u00fdval\u00fdch impregna\u010dn\u00fdch z\u00e1vodoch vo \u0160v\u00e9dskom \u00c5sbro boli p\u00f4vodcami zne\u010dis\u0165uj\u00facich l\u00e1tok ktor\u00e9 sa roz\u0161\u00edrili do jazier Tisaren, \u00c5sasj\u00f6n a\u00a0rieky Estabo\u00e5n. Aj napriek ukon\u010deniu prev\u00e1dzky t\u00fdchto z\u00e1vodov pred viac ako p\u00e4\u0165desiatimi rokmi zostali dodnes tieto zne\u010dis\u0165uj\u00face l\u00e1tky, predov\u0161etk\u00fdm PAH a\u00a0Arz\u00e9n, ulo\u017een\u00e9 v\u00a0dnovom sedimente spomenut\u00fdch vodn\u00fdch pl\u00f4ch a\u00a0aj na\u010falej predstavovali riziko pre \u017eivotn\u00e9 prostredie. Obzvl\u00e1\u0161\u0165<\/p>\n","protected":false},"author":2,"featured_media":10057,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/posts\/10060"}],"collection":[{"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/comments?post=10060"}],"version-history":[{"count":4,"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/posts\/10060\/revisions"}],"predecessor-version":[{"id":10140,"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/posts\/10060\/revisions\/10140"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/media\/10057"}],"wp:attachment":[{"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/media?parent=10060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/categories?post=10060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/progroupe.net\/sk\/wp-json\/wp\/v2\/tags?post=10060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}