Imyanda iva mu kirere ni: irangi ry’umukungugu n’ibintu biva mu irangi rya spray, n’ibintu biva mu irangi ry’umukungugu biva mu gihe cyo kumisha irangi ry’umukungugu. Irangi ry’umukungugu riva ahanini mu gice cy’irangi ry’umukungugu mu gutera umwuka, kandi imiterere yaryo ihuye n’irangi rikoreshwa. Ibintu biva mu irangi by’umukungugu ahanini biva mu bintu biva mu irangi ry’umukungugu n’ibintu biva mu irangi, inyinshi muri zo ni imyuka ihumanya, kandi imyanda yazo y’ingenzi ni xylene, benzene, toluene n’ibindi. Kubwibyo, isoko nyamukuru y’imyanda mibi iva mu irangi ni icyumba cyo gusiga irangi, icyumba cyo kumisha n’icyumba cyo kumisha.
1. Uburyo bwo gutunganya imyuka y'imyanda mu muyoboro w'imodoka
1.1 Gahunda yo gutunganya imyuka y'imyanda y'umwimerere mu gihe cyo kumisha
Gazi iva mu cyumba cyo kumisha amashanyarazi, icyumba cyo gutwikiramo ibintu biciriritse n'icyumba cyo kumishamo ibintu bitwikwa hejuru ni icy'imyanda ishyushye cyane kandi ifite ubushyuhe bwinshi, ikaba ikwiriye uburyo bwo gutwika. Kuri ubu, ingamba zikoreshwa cyane mu gutunganya imyuka ishyushye mu buryo bwo kumisha zirimo: ikoranabuhanga ryo kuvugurura ubushyuhe (RTO), ikoranabuhanga ryo gutwika ibintu bishya (RCO), na sisitemu yo gutwika ubushyuhe ya TNV.
1.1.1 Ikoranabuhanga ryo kubika ubushyuhe mu buryo bwo kugabanya ubushyuhe (RTO)
Oxidateur y'ubushyuhe (Regenerative Thermal Oxidizer, RTO) ni igikoresho kirengera ibidukikije kizigama ingufu mu kuvura imyuka ihumanya ikirere ikoreshwa mu buryo buringaniye n'ubuciriritse. Kibereye ubwinshi bw'imyuka ihumanya ikirere, ubunini buke, kibereye ubwinshi bw'imyuka ihumanya ikirere buri hagati ya 100 PPM-20000 PPM. Igiciro cyo gukora ni gito, iyo ubunini bw'imyuka ihumanya ikirere buri hejuru ya 450 PPM, igikoresho cya RTO ntigikeneye kongeramo lisansi y'inyongera; igipimo cyo gusukura ni kinini, igipimo cyo gusukura cy'imyuka ibiri ya RTO gishobora kugera ku kigero cya 98%, igipimo cyo gusukura cy'imyuka itatu ya RTO gishobora kugera ku kigero cya 99%, kandi nta mwanda wa kabiri nka NOX; kugenzura byikora, gukora byoroshye; umutekano ni mwinshi.
Igikoresho cyo kuvugurura ubushyuhe gikoresha uburyo bwo kuvugurura ubushyuhe kugira ngo gikoreshwe mu kuvura ubwinshi bw’imyanda y’umwimerere hagati n’ubuke bw’imyanda y’umwimerere, kandi icyuma gihindura ubushyuhe cyo kubika ubushyuhe cya ceramic gikoreshwa mu kugarura ubushyuhe. Kigizwe n’igitanda cyo kubika ubushyuhe cya ceramic, icyuma gihindura ubushyuhe cyikora, icyumba cyo gutwika n’uburyo bwo kugenzura. Ibintu by’ingenzi ni ibi: icyuma gihindura ubushyuhe cyikora kiri munsi y’igitanda cyo kubika ubushyuhe gihuzwa n’umuyoboro w’ibanze w’injira n’umuyoboro w’ibanze w’ibyuka, kandi icyuma gitunganya ubushyuhe kibikwa binyuze mu gushyushya gazi y’umwimerere yinjira mu gitanda cyo kubika ubushyuhe gikoresheje ibikoresho byo kubika ubushyuhe bya ceramic kugira ngo gikurure kandi gikure ubushyuhe; gazi y’imyanda y’umwimerere ishyushye kugeza ku bushyuhe runaka (760℃) irashyuha mu cyumba cyo gutwika kugira ngo ikore dioxyde de carbone n’amazi, kandi irasukurwa. Inyubako isanzwe ya RTO y’ibitanda bibiri igizwe n’icyumba kimwe cyo gutwika, ibitanda bibiri byo gupakira bya ceramic n’ibyuma bine byo guhindura. Ikigo gihindura ubushyuhe cyo kubika ubushyuhe cya ceramic kiri mu gikoresho gishobora kongera ubushyuhe ku kigero kirenze 95%; Nta lisansi nyinshi cyangwa nkeya ikoreshwa mu kuvura gazi y’imyanda y’umwimerere.
Ibyiza: Mu guhangana n'amazi menshi atembera kandi ubwinshi bw'imyanda y'umwimerere buke, ikiguzi cyo kuyikoresha ni gito cyane.
Ingaruka mbi: ishoramari rikabije ry’inshuro imwe, ubushyuhe bwinshi bwo gutwika, ntibikwiriye kuvura imyuka myinshi y’imyanda ikomoka ku bimera, hari ibice byinshi byimuka, bisaba imirimo myinshi yo kubungabunga.
1.1.2 Ikoranabuhanga ryo gutwika hakoreshejwe ubushyuhe (RCO)
Igikoresho cyo gutwika gihindura ingufu (Regenerative Catalytic Oxidizer RCO) gikoreshwa mu buryo butaziguye ku gipimo kiri hagati n'icya hejuru (1000 mg/m3-10000 mg/m3) cyo gutunganya imyuka y'imyanda y'umwimerere. Ikoranabuhanga ryo gutunganya RCO rikwiriye cyane cyane ku giciro kinini cyo kugarura ubushyuhe, ariko kandi rikwiriye ku murongo umwe wo gukora, bitewe n'ibicuruzwa bitandukanye, imiterere y'imyuka y'imyanda ikunze guhinduka cyangwa igipimo cy'imyuka y'imyanda gihinduka cyane. Cyane cyane ku gikenewe cyo kugarura ingufu z'ubushyuhe mu bigo cyangwa kuvugurura imyuka y'imyanda y'imirongo y'imyanda, kandi kugarura ingufu bishobora gukoreshwa mu kumisha umurongo w'imyanda, kugira ngo intego yo kuzigama ingufu igerweho.
Ikoranabuhanga ryo kuvura ibyuka bishya bikoresha umwuka ni uburyo busanzwe bwo gukora ibyuka bishya, ari na bwo buryo bwo gukora ibyuka bishya bikoresha umwuka wa ogisijeni. Mu gihe cyo gukora ibyuka bishya bikoresha umwuka, kwinjira k'ubuso bw'umuyoboro w'umwuka bituma molekile zikora ibyuka bikungahaye ku buso bw'umuyoboro w'umwuka. Ingaruka z'umuyoboro w'umwuka mu kugabanya ingufu zikoreshwa zihutisha ibyuka bishya kandi zikongera umuvuduko w'ibyuka bishya. Mu gihe cy'ibikorwa bya catalyst runaka, ibintu binyabuzima bibaho nta gushya kwa ogisijeni ku bushyuhe buke (250 ~ 300℃), bigahinduka dioxyde de carbone na dioxyde, bigasohora ingufu nyinshi z'ubushyuhe.
Igikoresho cya RCO kigizwe ahanini n'umubiri w'itanura, umubiri ubika ubushyuhe, sisitemu yo gutwika, sisitemu yo kugenzura yikora, valve yikora n'izindi sisitemu nyinshi. Mu ikorwa ry'inganda, gaze isohoka mu kirere yinjira muri valve izenguruka y'ibikoresho binyuze mu mufana utera umwuka, maze gaze yinjira n'umwuka usohoka bigatandukana burundu binyuze muri valve izenguruka. Ububiko bw'ingufu z'ubushyuhe n'ihindagurika ry'ubushyuhe bya gaze hafi ya byose bigera ku bushyuhe bugenwa na catalytic oxidation y'urwego rwa catalytic; gaze isohoka ikomeza gushyuha mu gace gashyushya (byaba hakoreshejwe amashanyarazi cyangwa ubushyuhe bwa gaze karemano) kandi igakomeza ku bushyuhe bugenwa; yinjira muri catalytic oxidation kugira ngo irangize catalytic oxidation reaction, ni ukuvuga, reaction ikora dioxyde de carbone na amazi, kandi isohora ingufu nyinshi z'ubushyuhe kugira ngo igere ku ngaruka nziza yo kuyitunganya. Gaze iterwa na catalytic oxidation yinjira muri ceramic material layer 2, kandi ingufu z'ubushyuhe zisohoka mu kirere binyuze muri valve izenguruka. Nyuma yo gusukura, ubushyuhe bw'imyotsi nyuma yo gusukura buba buri hejuru gato y'ubushyuhe mbere yo gusukura gaze imyanda. Sisitemu ikora buri gihe kandi igahinduranya mu buryo bwikora. Binyuze mu gikorwa cyo kuzenguruka kw'ingufu, ibice byose by'ibumba birangiza intambwe zo gushyushya, gukonjesha no gutunganya, kandi ingufu z'ubushyuhe zishobora kugaruzwa.
Ibyiza: inzira yoroshye yo gukora, ibikoresho bito, imikorere yizewe; imikorere myiza yo gusukura, muri rusange irenga 98%; ubushyuhe buke bwo gutwika; ishoramari rito ryo gukoresha mu mazi, igiciro gito cyo gukora, imikorere myiza yo kugarura ubushyuhe muri rusange ishobora kugera kuri 85%; inzira yose idakozwemo amazi mabi, imikorere yo gusukura ntabwo itera umwanda wa NOX; Ibikoresho byo gusukura RCO bishobora gukoreshwa mu cyumba cyo kumisha, gazi isukuye ishobora kongera gukoreshwa mu cyumba cyo kumisha, kugira ngo igere ku ntego yo kuzigama ingufu no kugabanya imyuka ihumanya;
Ingaruka mbi: igikoresho cyo gutwika gikoreshwa mu gutwika kibereye gusa mu kuvura imyanda ya organic ifite ibice bya organic bifite aho bishyuha bike kandi gifite ivu rike, kandi kuvura imyanda ya organic nk'umwotsi w'amavuta ntibikwiye, kandi catalyst igomba kuba irimo uburozi; ubwinshi bw'imyanda ya organic buri munsi ya 20%.
1.1.3 Sisitemu yo gutwika ubushyuhe ya TNV yo kongera gukoresha uburyo bwo kongera gukoresha ubushyuhe
Sisitemu yo gutwika ubushyuhe bwo mu bwoko bwa Recycling (German Thermische Nachverbrennung TNV) ni ugukoresha gaze cyangwa lisansi ishyushya imyanda irimo organic solvent, ikoreshwa n'ubushyuhe bwinshi, organic solvent molecules ihindura oxidation muri dioxyde de carbone na water, gaze ihindura ubushyuhe bwinshi binyuze mu gikoresho gifasha mu guhererekanya ubushyuhe mu byiciro byinshi, uburyo bwo gutwika gaze ikenera umwuka cyangwa amazi ashyushye, ihindura oxidation yuzuye ihindura oxidation ingufu z'ubushyuhe bwa gaze, igabanya ikoreshwa ry'ingufu z'uburyo bwose. Kubwibyo, sisitemu ya TNV ni uburyo bwiza kandi bwiza bwo gutunganya gaze ihindura oxidation iyo uburyo bwo kuyikora bukeneye ingufu nyinshi z'ubushyuhe. Ku murongo mushya wo gukora irangi rya electrophoretic, sisitemu yo gutwika ubushyuhe ya TNV ikoreshwa muri rusange.
Sisitemu ya TNV igizwe n'ibice bitatu: sisitemu yo gushyushya no gutwika imyanda, sisitemu yo gushyushya umwuka uzenguruka n'isitemu yo gushyushya umwuka mwiza. Igikoresho cyo gushyushya imyanda gishyushya umwuka mu buryo bw'umwuka ni igice cy'ingenzi cya TNV, kigizwe n'umubiri w'itanura, icyumba cyo gutwika, icyo gushyushya ubushyuhe, icyo gutwika n'icyuma gitunganya umuyoboro mukuru. Imikorere yacyo ni iyi: hamwe n'umufana ufite umuvuduko mwinshi, umwuka mubi w'umwimerere uva mu cyumba cyo kumisha, nyuma yo gutwika imyanda igikoresho cyo gushyushya cyubatswemo icyo gushyushya ubushyuhe, kijya mu cyumba cyo gutwika, hanyuma kikanyura mu gishyushya, ku bushyuhe bwinshi (hafi 750°C) kugeza ku kubora kw'imyanda mibi, kubora imyanda mibi mu mwuka wa dioxyde de carbone n'amazi. Imyanda mibi ikomoka mu bushyuhe bwinshi isohoka binyuze mu cyo gushyushya ubushyuhe n'umuyoboro mukuru wa gaze mu itanura. Imyanda mibi ishyushya umwuka mubi mu cyumba cyo kumisha kugira ngo itange ingufu zikenewe mu cyumba cyo kumisha. Igikoresho cyo kwimura ubushyuhe bushya gishyirwa ku mpera ya sisitemu kugira ngo gisubize ubushyuhe bw'imyanda mibi mu buryo bwo kumisha bwa nyuma. Umwuka mwiza wongerewe n'icyumba cyo kumisha ushyushywa na gaze y'amazi hanyuma woherezwa mu cyumba cyo kumisha. Byongeye kandi, hari na valve igenzura amashanyarazi ku muyoboro mukuru wa gaze y'amazi, ikoreshwa mu guhindura ubushyuhe bwa gaze y'amazi aho igikoresho gisohokera, kandi ubushyuhe bwa nyuma bwa gaze y'amazi bushobora kugenzurwa kuri dogere 160°C.
Ibiranga igikoresho gishyushya imyanda gitwika gazi hagati birimo: igihe gazi y’imyanda ya organic iguma mu cyumba cyo gutwika ni 1 ~ 2s; igipimo cyo kubora kwa gazi y’imyanda ya organic kirenga 99%; igipimo cyo kugarura ubushyuhe gishobora kugera kuri 76%; naho igipimo cyo guhindura umusaruro w’ibicanwa gishobora kugera kuri 26 ∶ 1, kugeza kuri 40 ∶ 1.
Ingaruka mbi: iyo havurwa imyuka y’imyanda y’umwimerere ifite ubushobozi buke, ikiguzi cyo kuyikoresha kiba kinini; icyuma gihindura ubushyuhe mu buryo bw’umuyoboro gikomeza gukora gusa, kiramba.
1.2 Gahunda yo kuvura imyuka y'imyanda ikomoka ku bimera mu cyumba cyo gusiga amarangi n'icyumba cyo kumisha
Gazi iva mu cyumba cyo gusiga amarangi no mu cyumba cyo kumishamo irangi ni nkeya, umuvuduko munini w'amazi n'imyanda ihumanya mu bushyuhe bw'icyumba, kandi ibigize imyanda ni aromatic hydrocarbons, alcohol ethers na ester organic solvents. Kuri ubu, uburyo bwo hanze bugezweho ni: ubwinshi bwa mbere bw'imyanda ihumanya mu kugabanya ingano yose y'imyanda ihumanya mu bidukikije, hakoreshejwe uburyo bwa mbere bwo kugabanya imyanda (activated carbon cyangwa zeolite nk'amodori) kugira ngo habeho ukwiyongera guke kw'imyanda ihumanya mu bushyuhe bw'icyumba, hakoreshejwe uburyo bwo gukuramo imyuka ishyushye mu bushyuhe bwinshi, imyuka ishyushye ikoresheje catalytic combustion cyangwa regenerative thermal combustion method.
1.2.1 Igikoresho cyo kumena no gutunganya karubone gikoreshwa mu buryo bwa activated carbon
Gukoresha amakara akoreshwa n'ibinyampeke nk'ikintu gitera umwuka, hamwe n'amahame yo gutunganya umwuka, kongera umwuka no gukurura VOC n'ingufu zikoresha umwuka, ingano nini y'umwuka, ingano nto y'imyanda y'ibinyabuzima binyuze mu guhumeka umwuka ukoresha umwuka kugira ngo ugere ku ntego yo gutunganya umwuka, Iyo umwuka ukoreshwa urimo umwuka urimo umwuka hanyuma ugakoresha umwuka ushyushye kugira ngo uhindure umwuka, ibintu bikomoka ku bimera bivangwa byoherezwa mu gikoresho cyo gutwika umwuka kugira ngo bitwike umwuka, ibintu bikomoka ku bimera bihinduka umwuka udafite ingaruka mbi ku mwuka n'amazi, imyuka ishyushye ishyushye ishyushya umwuka ukonje binyuze mu gikoresho gihindura ubushyuhe, Imyuka ikonjesha nyuma yo guhindura ubushyuhe, Igice cyo kongera umwuka ukoreshwa n'ibinyampeke, Kugira ngo bigere ku ntego yo gukoresha ubushyuhe no kuzigama ingufu. Igikoresho cyose kigizwe na pre-filter, adsorption bed, catalytic combustion bed, catalytic combustion retardancy, fan ijyanye nayo, valve, nibindi.
Igikoresho cyo gusukura umwuka wa karuboni ukoresheje activated adsorption-desorption cyakozwe hakurikijwe amahame abiri y'ibanze yo gutwika no gutwika katalisiti, hakoreshejwe inzira ebyiri zihoraho, icyumba cyo gutwika katalisiti, ahantu habiri ho gutwika hakoreshwa uburyo butandukanye. Ubwa mbere, gaze y'imyanda ya organic hamwe no gutwika karuboni ukoresheje activated adsorption, iyo ubwinshi bw'umwuka buhagaze vuba, hanyuma hagakoreshwa umwuka ushyushye kugira ngo hakure ibintu bya organic muri karuboni ikoreshwa kugira ngo hakorwe regeneration ya karuboni ikoreshwa; ibintu bya organic biba byariyongereye (ubunini burenze inshuro nyinshi ugereranyije n'ubwa mbere) maze byoherezwa mu cyumba cyo gutwika katalisiti gikoresha catalytic casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting casting. Iyo ubunini bw'imyanda ya organic bugeze kuri 2000 PPm, gaze y'imyanda ya organic ishobora gukomeza gutwika mu buryo bwikora mu gikoresho cyo gutwika katalisiti nta bushyuhe bwo hanze. Igice cya gaze yo gutwika isohoka mu kirere, kandi inyinshi muri zo zoherezwa mu gikoresho cyo gutwika karuboni ikoreshwa. Ibi bishobora guhaza ingufu z'ubushyuhe zikenewe mu gutwika no gutwika, kugira ngo bigere ku ntego yo kuzigama ingufu. Gusubiramo bishobora kwinjira mu ishyirwa ry’amazi rikurikira; mu ishyirwa ry’amazi, igikorwa cyo gusukura gishobora gukorwa n’ikindi gikoresho cyo gusora amazi, gikwiriye gukoreshwa mu buryo buhoraho no mu gihe gito.
Imikorere n'imiterere ya tekiniki: imikorere ihamye, imiterere yoroshye, umutekano kandi wizewe, igabanya ingufu kandi igabanya abakozi, nta mwanda uhumanya ukabije. Ibikoresho bitwikira agace gato kandi bifite uburemere bworoshye. Bikwiriye cyane gukoreshwa mu bwinshi. Agace ka karuboni gakoresha umwuka w'imyanda y'umwimerere gakoresha umwuka w'imyanda nyuma yo gutwika gakoresha umwuka w'imyanda kugira ngo gakoreshwe, kandi umwuka wo gutwika woherezwa mu cyumba cy'umuriro w'ingufu kugira ngo utunganywe, nta ngufu zo hanze, kandi ingaruka zo kuzigama ingufu ni nini. Imbogamizi ni uko karuboni ikoresha umwuka ari nto kandi ikiguzi cyayo cyo gukora ni kinini.
1.2.2 Igikoresho cyo gusukura ipine rya Zeolite rikoresha uburyo bwo kohereza inziga
Ibice by'ingenzi bya zeolite ni: silikoni, aluminiyumu, ifite ubushobozi bwo kuyungurura, ishobora gukoreshwa nk'iyungurura; zeolite runner igomba gukoresha imiterere y'ubuso bwihariye bwa zeolite bufite ubushobozi bwo kuyungurura no kuyungurura mu bihumanya ibidukikije, kugira ngo imyuka isohora umwuka ya VOC ifite ubushobozi buke kandi ifite ubushobozi bwinshi, igabanye ikiguzi cyo gukoresha ibikoresho byo gutunganya inyuma. Imiterere y'ibikoresho byayo ikwiriye mu gutunganya amazi menshi, afite ubushobozi buke, kandi arimo ibice bitandukanye by'ibinyabuzima. Imbogamizi ni uko ishoramari rya mbere ari rinini.
Igikoresho cyo gusukura umwuka cya Zeolite runner ni igikoresho cyo gusukura umwuka gishobora gukora ibikorwa byo gusukura no gukuramo umwuka. Impande ebyiri z'uruziga rwa zeolite zigabanyijemo ibice bitatu n'igikoresho cyihariye cyo kuziba: agace ko gusukura umwuka, agace ko gusukura umwuka (regeneration) n'agace ko gukonjesha. Imikorere ya sisitemu ni iyi: uruziga rwa zeolite ruzenguruka buri gihe ku muvuduko muto, Kuzenguruka mu gace ko gusukura umwuka, agace ko gusukura umwuka (regeneration) n'agace ko gukonjesha; Iyo umwuka usohoka ukabije n'ingano y'umuyaga binyura mu gace ko gusukura umwuka, VOC mu mwuka usohoka unyuzwamo umwuka inyuzwamo umwuka na zeolite y'uruziga ruzunguruka, Isohora ry'umwuka ritaziguye nyuma yo gusukura no kuwusukura; Umushongi w’ibinyabuzima winjijwe n’uruziga woherezwa mu gace koherezwamo umwuka (regeneration) hamwe n’uruziga ruzunguruka, Hanyuma hamwe n’umwuka muto ushyushya umwuka ukomeza mu gace koherezwamo umwuka, VOC winjijwe mu ruziga ivugururwa mu gace koherezwamo umwuka, Imyuka isohora umwuka ya VOC isohoka hamwe n’umwuka ushyushye; Inziga ijya mu gace ko gukonjesha kugira ngo ikonjeshe ishobora kongera gushyirwamo umwuka, hamwe n’uruziga ruzunguruka buri gihe, imyuka isohoka, isohoka, n’ikorwa ry’ingendo yo gukonjesha birakorwa, Menya neza ko imyuka ihumanya ikomeza gukora neza kandi ihamye.
Igikoresho cya zeolite runner ni ikintu gishyushya umwuka, kandi umwuka uvamo umwuka urimo organic solvent ugabanyijemo ibice bibiri: umwuka mwiza ushobora gusohoka mu buryo butaziguye, n'umwuka wongera gukoreshwa urimo organic solvent nyinshi. Umwuka mwiza ushobora gusohoka mu buryo butaziguye kandi ushobora kongera gukoreshwa mu buryo bw'umwuka ushyushya umwuka; ubwinshi bwa gazi ya VOC bungana n'inshuro 10 z'ubwinshi bwa VOC mbere yo kwinjira muri sisitemu. Gazi ikomeye ivurwa no gutwika ubushyuhe bwinshi binyuze muri sisitemu yo gutwika ubushyuhe bwa TNV (cyangwa ibindi bikoresho). Ubushyuhe buturuka mu gutwika ni ugushyushya mu cyumba cyo kuma no gushyushya zeolite, kandi ingufu z'ubushyuhe zikoreshwa neza kugira ngo zigere ku ngaruka zo kuzigama no kugabanya imyuka ihumanya.
Imikorere n'imiterere ya tekiniki: imiterere yoroshye, kubungabunga byoroshye, kumara igihe kirekire; gukoresha neza no gukuramo umwuka mwinshi, guhindura ingano y'umwuka wa VOC w'umwimerere urimo umwuka mwinshi n'umwuka muto w'imyanda urimo umwuka muto n'umwuka mwinshi, kugabanya ikiguzi cy'ibikoresho byo gutunganya nyuma; kugabanuka k'umuvuduko muke cyane, bishobora kugabanya cyane ikoreshwa ry'ingufu z'amashanyarazi; gutegura sisitemu muri rusange no gushushanya modular, hamwe n'umwanya muto, kandi bigatanga uburyo bwo kugenzura buhoraho kandi butagira umushoferi; bishobora kugera ku gipimo cy'igihugu cy'ibyuka bihumanya; adsorbent ikoresha zeolite idashya, kuyikoresha ni byiza; ikibi ni ishoramari rimwe gusa rifite igiciro kinini.
Igihe cyo kohereza: Mutarama-03-2023
