Kungani Izinzwa ze-Nitrate ze-ISE ze-Real-Time Zithatha Indawo Yokuthatha Isampula Yekota Ezindaweni Zokuvikela Amanzi Angaphansi Komhlaba zaseYurophu

Nansi indlela yokusebenza yokuqoqa isampula yamanzi angaphansi komhlaba njalo ngekota ukuze kutholakale i-nitrate. Uchwepheshe ovela ebhodini lamanzi ufika emthonjeni wokuqapha ngoMashi 15, wehlisa umqoqi wesampula, uqoqa isampula engamamililitha angu-500, bese eyithumela elabhorethri eqinisekisiwe. Umbiko welabhorethri ufika ngoMashi 22. Ukuhlushwa kwe-nitrate kulowo mthombo, ngalolo suku olulodwa ngoMashi, kwakungu-48 mg/L — 2 mg/L ngaphansi komkhawulo we-EU Nitrates Directive ongu-50 mg/L. Umbiko wekota uyafakwa. Indawo yomthombo iyaqhubeka nokusebenza.

Lokho umbiko ongakuthwebuli: isenzakalo semvula enkulu ngoMashi 19 sakhipha i-nitrogen evela ensimini yommbila esanda kufakelwa yaya emanzini angajulile. Ngomhlaka-24 Mashi, ukugcwala kwe-nitrate kulowo mthombo wokuqapha ofanayo kwakungu-71 mg/L. Isampula elandelayo yekota ihlelelwe umhlaka-15 Juni. Izinsuku ezingu-83, amanzi okuphuza ane-nitrate angaphezu komkhawulo osemthethweni akhishwa, aphathwa, futhi asatshalaliswa emakhaya. Akekho owayazi. Uhlelo lokuhlola lwekota, oluhambisana ngokuphelele nemfuneko yokuqapha engokomthetho, lwathatha iphuzu elilodwa ledatha elawela phakathi kohambo olubili.

Inzwa: Okushiwo Yi-"Ion-Selective Electrode" Empeleni Emanzini Angaphansi Komhlaba

Inzwa ye-ISE nitrate ayilinganisi i-nitrate ngokubona. Ayisebenzisi ukumuncwa kwe-UV ngendlela inzwa ye-COD yamanzi angaphezulu eyisebenzisa ngayo. Isebenzisa i-polymer membrane efakwe i-ionophore - i-molecule ebopha ama-ion e-nitrate ngokukhetha - ukukhiqiza amandla e-voltage alingana nomsebenzi we-nitrate emanzini azungezile. Leyo voltage, elinganiswa ne-electrode yokubhekisela futhi ikhokhelwa izinga lokushisa, iguqulwa ibe ukufundwa kwe-concentration ku-mg/L nge-Nernst equation.

Ukukhetha kubalulekile ngoba amanzi angaphansi komhlaba akuyona isisombululo se-nitrate esimsulwa. Iqukethe i-chloride, i-bicarbonate, i-sulfate, kanye ne-organic carbon encibilikisiwe, konke okungaphazamisa ukulinganiswa uma ulwelwesi lungakhethi ngokwanele. Ulwelwesi lwe-sensor ye-Honde lune-coefficient yokukhetha i-nitrate engaba ngu-0.001 ngokumelene ne-chloride - okusho ukuthi isabela cishe izikhathi eziyi-1,000 kakhulu ku-nitrate kune-chloride ngamanani alinganayo. Emanzini angaphansi komhlaba aseDutch, lapho amazinga e-chloride emanzini angaphansi komhlaba avame ukuba phakathi kuka-20 no-80 mg/L, lokhu kusho ukuthi ukuphazamiseka kwe-chloride kunikela ngaphansi kuka-0.1 mg/L we-nitrate ebonakalayo - okuncane kakhulu uma kuqhathaniswa nomkhawulo wokulawula ongu-50 mg/L.

Ukukhishwa kwedijithali kwe-RS485 Modbus-RTU kuqeda ukuwohloka kwesignali ye-analog phezu kwamamitha angu-30 kuya kwangu-100 ekhebula phakathi kwenzwa engaphansi kwamanzi yomthombo wokuqapha kanye ne-datalogger ye-wellhead. Ku-loop ye-analog engu-4-20mA egijima ngamamitha angu-80 ekhebula nge-casing yomthombo omanzi, isignali ingahamba ngo-2-3% ngenxa yokuphazamiseka kwe-ground-loop kanye nokungena komswakama ebhokisini lokuhlangana. I-RS485 yedijithali iyahluka — ilinganisa umehluko we-voltage phakathi kwezintambo ezimbili zesignali, kanye nokukhansela komsindo wemodi evamile. Ukufundwa kwe-wellhead kufana nokufundwa kwe-sensor.

Isinxephezelo sokushisa okuzenzakalelayo sakhiwe ekhanda lenzwa. Izinga lokushisa lamanzi angaphansi komhlaba ezindaweni zamanzi ezingajulile zaseDutch liyahlukahluka ngokwezinkathi kusukela ku-8°C ngoMashi kuya ku-14°C ngoSepthemba. I-Nernst equation ifaka isici se-slope esincike ekushiseni esikhiqiza iphutha elingu-2% nge-degree Celsius uma lingakhokhelwa. I-thermistor ehlanganisiwe ilungisa lokhu ngesikhathi sangempela.

Kungani iNetherlands, Kungani Manje

INetherlands isebenza ngaphansi kokwehliswa kwe-Nitrates Directive - imvume ekhethekile yokufaka umquba wezilwane omningi ngehekthare kunomkhawulo ojwayelekile we-EU we-nitrogen engu-170 kg ngehekthare ngonyaka - ngenxa yokulima kwezwe okukhiqiza kakhulu utshani. Lokhu kwehliswa kwavuselelwa, kwabe sekuqiniswa, kanti incwadi yeKhomishini yaseYurophu kaDisemba 2025 eya kuNgqongqoshe Wezolimo waseDutch uFemke Wiersma yabhekisela ngokucacile isidingo "sokuqapha okuthuthukisiwe" kwe-nitrate yamanzi angaphansi komhlaba ezindaweni ezinenhlabathi yesihlabathi. Ukuhlolwa kweKhomishini kaJulayi 2026 kuqinisekisile ukuthi i-Directive "isadingeka, ifanelekile futhi isebenza kahle" ukuvikela amanzi e-EU.

Ukuqaliswa kokuhlola kwezinzwa ze-ISE ze-nitrate ze-Honde RS485 kwaqaliswa ngo-Ephreli 2026 emithonjeni engu-25 yokuqapha ezindaweni zokuvikela amanzi angaphansi komhlaba zaseGroningen naseDrenthe, eziqhutshwa yinkampani yamanzi okuphuza iVitens.

Indlela Inethiwekhi Esebenza Ngayo Kuzo Zonke Izindawo Zokuqapha Ezingu-25

Imithombo engu-25 isukela kumamitha angu-15 kuya kwangu-45 ukujula, yonke itholakala emanzini angaphansi komhlaba e-Pleistocene ane-hydraulic conductivity ephezulu - okusho ukuthi isabela ngokushesha ekuthwaleni kwe-nitrate engaphezulu futhi ilulame ngokushesha okufanayo lapho umthombo we-nitrogen ususwa. Impendulo esheshayo isebenza ngazo zombili izindlela: umthombo ungakhuphuka usuka ku-30 ​​uye ku-70 mg/L ezinsukwini ezintathu ngemva kwemvula enkulu, futhi ungabuyela emuva ku-35 mg/L ngesonto kamuva lapho ukushaya kwenhliziyo kudlula. Isampula yekota ingaphuthelwa kokubili ukuphakama kanye nokululama, ibike ukuthi i-42 mg/L sengathi akwenzekanga lutho.

Inzwa ngayinye ye-Honde nitrate ifakwa esikhaleni esivikelwe somthombo wokuqapha, ilenga kukhebula lensimbi engagqwali ekujuleni lapho amanzi angaphansi komhlaba engena khona emgodini womthombo. Ikhebula le-RS485 ligijimela ku-datalogger efakwe ngaphakathi kwe-wellhead ebiyelwe. Emigodini engu-18 kwengu-25, i-datalogger ixhuma kumojuli we-4G odlulisela ukufundwa kwe-nitrate kwemizuzu engu-15 ku-MQTT Json epulatifomu yekhwalithi yamanzi ephakathi yeVitens. Eminye imithombo engu-7 esele - etholakala ezindaweni zokugcina imvelo ezikude lapho kungekho khona ukumbozwa kwamaselula - imojuli yi-LoRaWAN, edlulisela idatha esangweni esiteshini sokupompa esiseduze, esingamakhilomitha angu-8 kuya kwangu-14 ukusuka lapho.

Ekhanda lomthombo, i-Data logger enesikrini ibonisa ukuhlushwa kwe-nitrate kwamanje, ukuthambekela kwamahora angu-24, kanye nomlando wezinsuku ezingu-30. Ngesikhathi sokuhlolwa kokulinganisa kwanyanga zonke, uchwepheshe wasensimini usebenzisa i-Handmeter ukuqinisekisa inzwa efakiwe ngokumelene nesampula yokubamba ehlaziywe elebhu eqoqwe ngasikhathi sinye emthonjeni ofanayo. Uma inzwa idlule ngaphezu kuka-±2 mg/L, ishintshwa endaweni yayo ngaphansi kwemizuzu engu-20 bese ilinganiswa kabusha elabhorethri ephakathi yeVitens.

Iseva yefu kanye nesofthiwe kuhlanganisa wonke ama-well angu-25 abe yideshibhodi eyodwa. Umphathi wezokusebenza angabona idatha yesikhathi sangempela kanye nedatha yomlando wensimu yonke ye-wellfield. Kodwa ideshibhodi akuyona indlela eyinhloko yokuphepha.

Uhlelo lokudlulisa i-alamu lukhona. Umthombo ngamunye unemingcele emibili ehleliwe. Umkhawulo wokuqala, ongu-40 mg/L, ubangela isaziso sesixwayiso kusenesikhathi eqenjini lekhwalithi yamanzi - isignali yokuthi umthombo usondela emkhawulweni osemthethweni ongu-50 mg/L futhi ungadinga ukulungiswa kwengxube esitshalweni sokwelapha. Umkhawulo wesibili, ongu-50 mg/L, ubangela ukudluliselwa okungokoqobo okungavala ngokuzenzakalelayo iphampu yomthombo noma kusebenze umthombo wokukhipha ohlukile, kuphambukise ukunikezwa ngaphambi kokuba amanzi angcolile afinyelele endaweni yokungenisa yokwelapha.

Imiphumela Yensimu: Izindawo Zokuvikela Amanzi Angaphansi Komhlaba zaseGroningen-Drenthe, ngo-Ephreli–Julayi 2026

Imiphumela yokusebenza ngemva kwezinsuku eziyi-100:

• Izinzwa eziqhubekayo zithole ukuvakasha okungu-31 kwe-nitrate okungaphezu kuka-50 mg/L okuwele ngokuphelele phakathi kwezinsuku zokuthatha amasampula kota. Lezi zenzakalo ezingu-31, ezimele inani elihlanganisiwe lamahora angaba ngu-1,800 okuvezwa kwe-nitrate okungaphezu komkhawulo, ngabe azibonakali ohlelweni lokuthatha amasampula kota olukhona.
• Emigodini engu-6, uhlelo lokudlulisa i-Alarm lwabangela ukuvalwa kwephampu okuzenzakalelayo lapho i-nitrate idlula ku-50 mg/L. Kuyo ngayinye yale migodi engu-6, ukuhlushwa kwe-nitrate kwase kwehle ngaphansi kuka-40 mg/L ngesikhathi isampula yekota isiqoqiwe - okusho ukuthi uhambo lwaluzobe lungabhalisiwe unomphela ngaphansi kohlelo lokuqapha lwangaphambilini.
• Ukunemba kwenzwa ye-ISE, okuqinisekiswe ngokuhlaziywa kwelabhorethri kwamasampula okubanjwa kwanyanga zonke, kwaba yisilinganiso esingu-±1.8 mg/L kuzo zonke izinzwa ezingu-25 esikhathini sezinsuku eziyi-100. Inzwa eyodwa yadlula ngaphandle kokubekezelelana okungu-±2 mg/L ngenyanga yesibili - ukugeleza kwatholakala ngokuqinisekiswa kwe-Handmeter yanyanga zonke futhi inzwa yashintshwa.
• Ithimba lekhwalithi yamanzi le-Vitens lisebenzise idatha yokuxwayisa kusenesikhathi evela emkhawulweni ongu-40 mg/L ukuze lilungise kusengaphambili izilinganiso zokuxuba ezitshalweni ezintathu zokwelapha, livimbele ukudlula okungenzeka okungu-12 ngaphambi kokuba kufinyelele emkhawulweni wokuvala ongu-50 mg/L.
• Ngokusekelwe kudatha yokuhlolwa, i-Vitens income ukwandisa ukuqapha okuqhubekayo kwe-nitrate emithonjeni yokuqapha engu-60 eyengeziwe ezindaweni zayo zokukhipha i-Gelderland ne-Overijssel ngo-2027.