A solar-operated wastewater treatment system developed at Israel’s Arava Institute has been installed at Umm Batin, a Bedouin village near Beersheba. The water is recycled for agriculture. Previously, residents polluted the groundwater because there was no sewage system.
https://www.timesofisrael.com/first-off-grid-wastewater-treatment-unit-in-bedouin-village-piloted/