Chifukwa Chake Ma Sensor a Nitrate a ISE a Real-Time Akulowa M'malo mwa Zitsanzo za Kutenga Kotala Limodzi M'malo Oteteza Madzi a Pansi pa Dziko ku Europe

Nayi njira yodziwira momwe madzi akumwa nitrate amagwirira ntchito kotala lililonse. Katswiri wochokera ku bungwe la madzi afika pachitsime chowunikira pa Marichi 15, amatsitsa wosonkhanitsa chitsanzo, amatola chitsanzo cha mamililita 500, ndikuchitumiza ku labotale yovomerezeka. Lipoti la labu limafika pa Marichi 22. Kuchuluka kwa nitrate pachitsimecho, tsiku lomwelo mu Marichi, kunali 48 mg/L — 2 mg/L pansi pa malire a EU Nitrates Directive a 50 mg/L. Lipoti la kotala lililonse limaperekedwa. Malo osungira madzi akupitiliza kugwira ntchito.

Zimene lipotilo silinalembe: mvula yamphamvu pa Marichi 19 inatulutsa nayitrogeni kuchokera m'munda wa chimanga womwe unali utangobzalidwa kumene kupita kumadzi osaya. Pofika pa Marichi 24, kuchuluka kwa nitrate pachitsime chomwecho chowunikira kunali 71 mg/L. Chitsanzo chotsatira cha kotala chikukonzekera pa June 15. Kwa masiku 83, madzi akumwa okhala ndi nitrate yoposa malire ovomerezeka anachotsedwa, kuchiritsidwa, ndikugawidwa m'mabanja. Palibe amene ankadziwa. Pulogalamu yopereka zitsanzo za kotala, yogwirizana bwino ndi lamulo loyang'anira, inatenga mfundo imodzi ya deta yomwe inagwera pakati pa maulendo awiri.

Sensor: Kodi "Electrode Yosankha Ion" Imatanthauza Chiyani pa Madzi Apansi pa Dziko?

Sensa ya nitrate ya ISE siiyeza nitrate moyezera kuwala. Siigwiritsa ntchito kuyamwa kwa UV monga momwe sensa ya COD ya pamwamba pa madzi imachitira. Imagwiritsa ntchito nembanemba ya polima yokhala ndi ionophore - molekyulu yomwe imamanga ma ayoni a nitrate mosankha - kuti ipange mphamvu ya voltage yofanana ndi ntchito ya nitrate m'madzi ozungulira. Voltage imeneyo, yoyesedwa motsutsana ndi electrode yowunikira ndikulipidwa kutentha, imasinthidwa kukhala kuwerenga kwa kuchuluka mu mg/L kudzera mu Nernst equation.

Kusankha n'kofunika chifukwa madzi apansi panthaka si njira yeniyeni ya nitrate. Ili ndi chloride, bicarbonate, sulfate, ndi organic carbon yosungunuka, zonse zomwe zingasokoneze muyeso ngati nembanembayo siisankha mokwanira. Nembanemba ya Honde sensor ili ndi nitrate selectivity coefficient ya pafupifupi 0.001 motsutsana ndi chloride - kutanthauza kuti imayankha pafupifupi nthawi 1,000 mwamphamvu ku nitrate kuposa chloride pamlingo wofanana. Mu madzi apansi panthaka aku Dutch, komwe kuchuluka kwa chloride m'madzi amchenga nthawi zambiri kumakhala pakati pa 20 mpaka 80 mg/L, izi zikutanthauza kuti kusokoneza kwa chloride kumathandizira zosakwana 0.1 mg/L za nitrate yooneka - yosafunikira poyerekeza ndi malire olamulira a 50 mg/L.

Kutulutsa kwa digito kwa RS485 Modbus-RTU kumachotsa kuwonongeka kwa chizindikiro cha analog pa chingwe cha mamita 30 mpaka 100 pakati pa sensa yozama ya chitsime chowunikira ndi datalogger ya chitsime. Mu lupu ya analog 4-20mA yomwe ikuyenda mamita 80 a chingwe kudzera mu chitsime chonyowa, chizindikirocho chimatha kuyenda ndi 2-3% chifukwa cha kusokonezeka kwa lupu ya pansi ndi kulowa kwa chinyezi pa bokosi lolumikizira. RS485 ya digito ndi yosiyana - imayesa kusiyana kwa magetsi pakati pa mawaya awiri a chizindikiro, ndi kuletsa phokoso la common-mode. Kuwerenga kwa chitsimecho ndikofanana ndi kuwerenga kwa sensa.

Kuchepetsa kutentha kwa madzi kumachitika kokha m'mutu wa sensa. Kutentha kwa madzi apansi panthaka m'madzi osaya a ku Dutch kumasiyana nyengo kuyambira 8°C mu Marichi mpaka 14°C mu Seputembala. Nernst equation imaphatikizapo slope factor yomwe imadalira kutentha yomwe imapanga cholakwika cha 2% pa digiri Celsius ngati sichilipidwa. Thermistor yolumikizidwa imakonza izi nthawi yeniyeni.

Chifukwa chiyani Netherlands, Chifukwa chiyani tsopano

Dziko la Netherlands limagwira ntchito motsatira malangizo a Nitrates derogation — chilolezo chapadera chogwiritsa ntchito manyowa ambiri a ziweto pa hekitala kuposa malire a EU a 170 kg a nayitrogeni pa hekitala pachaka — chifukwa cha ulimi wa udzu wobala zipatso zambiri mdzikolo. Kusagwiritsidwa ntchito bwino kwa mankhwalawa kunapangidwanso, kenako kunalimbikitsidwa, ndipo kalata ya European Commission ya Disembala 2025 yopita kwa Nduna ya Zaulimi ku Netherlands, Femke Wiersma, inanena momveka bwino kufunika kwa "kuyang'anira bwino" nitrate ya pansi pa nthaka m'madera okhala ndi nthaka yamchenga. Kuwunika kwa Commission mu Julayi 2026 kunatsimikizira kuti malangizowa "akufunikirabe, ndi ofunikira komanso ogwira ntchito" kuti ateteze madzi a EU.

Kuyika masensa a Honde RS485 nitrate ISE mu Epulo 2026 kunayamba kugwiritsidwa ntchito m'zitsime 25 zowunikira m'malo oteteza madzi apansi panthaka a Groningen ndi Drenthe, omwe amayendetsedwa ndi kampani ya Vitens yopereka madzi akumwa.

Momwe Network Imagwirira Ntchito M'zitsime 25 Zowunikira

Zitsime 25zi zimakhala ndi kuya kwa mamita 15 mpaka 45, zonse zili m'madzi amchere a Pleistocene okhala ndi mphamvu yothamanga kwambiri ya hydraulic - zomwe zikutanthauza kuti zimayankha mwachangu ku nitrate yomwe ili pamwamba ndipo zimachira mofulumira mofanana pamene gwero la nayitrogeni lachotsedwa. Kuyankha mwachangu kumagwira ntchito zonse ziwiri: chitsime chingakwere kuchokera pa 30 mpaka 70 mg/L patatha masiku atatu mvula yamphamvu itatha, ndipo chingabwererenso ku 35 mg/L patatha sabata imodzi pamene kugunda kwa mtima kwadutsa. Chitsanzo cha kotala limodzi chikhoza kuphonya kukwera ndi kuchira, ndikupereka 42 mg/L ngati kuti palibe chomwe chachitika.

Sensa iliyonse ya Honde nitrate imayikidwa pamalo otetezedwa a chitsime chowunikira, yopachikidwa pa chingwe chosapanga dzimbiri pansi pa kuya komwe madzi apansi amalowa m'chitsime. Chingwe cha RS485 chimapita ku chosungira deta chomwe chili mkati mwa chitsimecho. Pa zitsime 18 mwa 25, chosungira deta chimalumikizidwa ku module ya 4G yomwe imatumiza kuwerenga kwa nitrate kwa mphindi 15 mu MQTT Json kupita ku nsanja yapakati ya Vitens yokhudza madzi abwino. Pa zitsime 7 zotsalazo - zomwe zili m'malo osungirako zachilengedwe akutali komwe kulibe ma cell - module ndi LoRaWAN, yomwe imatumiza deta ku chipata chapafupi ndi malo opopera madzi, makilomita 8 mpaka 14 kutali.

Pa chitsime, Data logger yokhala ndi chinsalu imawonetsa kuchuluka kwa nitrate komwe kulipo, momwe zinthu zilili maola 24, komanso mbiri ya masiku 30. Pakayang'ana kuchuluka kwa madzi mwezi uliwonse, katswiri wamagetsi amagwiritsa ntchito Handmeter kuti atsimikizire sensa yoyikidwayo motsutsana ndi chitsanzo chojambulidwa ndi labotale chomwe chasonkhanitsidwa nthawi imodzi kuchokera pachitsime chomwecho. Ngati sensa yapita patsogolo kupitirira ±2 mg/L, imasinthidwa pamalopo mkati mwa mphindi zosakwana 20 ndikuyikonzanso ku labotale yayikulu ya Vitens.

Seva ya Cloud ndi mapulogalamu amaphatikiza zitsime zonse 25 kukhala dashibodi imodzi. Woyang'anira ntchito amatha kuwona deta yeniyeni ndi mbiri yakale ya chitsime chonsecho. Koma dashibodi si njira yayikulu yotetezera.

Dongosolo lotumizira alamu lili ndi. Chitsime chilichonse chili ndi malire awiri okonzedwa. Gawo loyamba, pa 40 mg/L, limayambitsa chidziwitso chadzidzidzi kwa gulu la anthu omwe ali ndi madzi abwino - chizindikiro chakuti chitsimecho chikuyandikira malire ovomerezeka a 50 mg/L ndipo chingafunike kusintha kosakanikirana pafakitale yochiritsira. Gawo lachiwiri, pa 50 mg/L, limayambitsa gawo lamagetsi lomwe lingathe kuzimitsa pampu ya chitsime kapena kuyambitsa chitsime china chochotsera madzi, kusokoneza madzi asanafike pamalo ochiritsira.

Zotsatira za M'munda: Malo Oteteza Madzi a Pansi pa Dziko ku Groningen-Drenthe, Epulo–Julayi 2026

Zotsatira za ntchito patatha masiku 100:

• Masensa opitilira adapeza maulendo 31 a nitrate opitilira 50 mg/L omwe adagwera kwathunthu mkati mwa masiku oyeserera kotala. Zochitika 31 izi, zomwe zikuyimira maola pafupifupi 1,800 a nitrate yopitilira malire, sizikanawoneka ndi pulogalamu yoyesera kotala yomwe ilipo.
• Pa zitsime 6, makina otumizira a Alarm adayambitsa kutseka kwa pampu yokha pamene nitrate idadutsa 50 mg/L. Pa zitsime 6 zilizonsezi, kuchuluka kwa nitrate kunali kutsika pansi pa 40 mg/L pofika nthawi yomwe chitsanzo cha kotala chikanasonkhanitsidwa - zomwe zikutanthauza kuti ulendowu ukanakhala wopanda zikalata zovomerezeka pansi pa ndondomeko yakale yowunikira.
• Kulondola kwa sensa ya ISE, komwe kunatsimikiziridwa potengera kusanthula kwa labotale kwa zitsanzo zojambulidwa pamwezi, kunali pafupifupi ±1.8 mg/L pa masensa onse 25 mkati mwa masiku 100. Sensa imodzi inapita kunja kwa kulekerera kwa ±2 mg/L m'mwezi wachiwiri - kusunthaku kunazindikirika ndi kutsimikizira kwa Handmeter pamwezi ndipo sensayo inasinthidwa.
• Gulu la Vitens loona za ubwino wa madzi linagwiritsa ntchito deta yochenjeza msanga kuchokera ku mlingo wa 40 mg/L kuti lisinthe ma mixing ratios m'mafakitale atatu ochiritsira, kuletsa kuchuluka kwa madzi okwana 12 asanafike mlingo wa 50 mg/L.
• Kutengera ndi deta yoyesera, Vitens yalimbikitsa kukulitsa kuwunika kosalekeza kwa nitrate ku zitsime zina 60 zowunikira m'malo ake ochotsera Gelderland ndi Overijssel mu 2027.