Comment on Rural India runs dry as thirsty megacity Mumbai sucks water

• Lovstuhagen@hilariouschaos.com ⁨1⁩ ⁨week⁩ ago

  Right, I just looked and saw there are some conflicting ideas about this.

  The brine issues seem quite abd:

  And even the desalination industry agrees concentrated salt is a problem. Because it is heavier than seawater, the brine tends to settle toward the bottom of the coastal areas where it is released—unless it is diluted. The excess salt decreases dissolved oxygen in the water, suffocating animals on the seafloor. Technologies exist to reduce brine waste prior to disposal or to mine pollutants out of the waste for commercial use—but this is generally cost-prohibitive. Instead, plants use other strategies to minimize damage.

  One such alternative involves situating plants in areas where strong currents help disperse the brine. But this is not always possible. For example, the Arabian Gulf is shallow, lacks strong currents and has seen incoming freshwater slow to a trickle due to upstream dams and to people in the region diverting water for drinking and irrigation. The Gulf is also a receptacle for salty “produced water” from the oil and gas industry. As a result of these factors, the Gulf is now about 25 percent saltier than typical seawater, with hotspots double or triple its regular salinity. In addition to harming sea life, extreme salinity also makes desalinating the water more difficult and expensive. The Red and the Mediterranean seas are also growing more saline.

  Some plants make efforts to better mix the brine into the ocean when discharged, either by using multiple waste outlets that spread it over a larger area or by pressurizing the waste flow to disperse it by force. A recent six-year study at the Sydney Desalination Plant in Australia found its pressure diffuser reduced excess salinity in coastal areas where waste brine was released. But the abnormally fast flow prevented species with slow-swimming larvae—such as tube worms, lace corals and sponges—from colonizing the impact zone. At the same time, species that thrive in high-flow conditions—such as barnacles and bivalves—increased in number, says study lead author Graeme Clark, a senior research associate at the University of New South Wales’s School of Biological, Earth and Environmental Sciences. The study showed an attempt to reduce the harm of extreme salinity can change the composition of species living in the outfall area. “It’s a bit of the lesson for the industry,” he says, about considering the impact of hydrodynamic changes. Nevertheless, he adds, the impacts are “less sinister…than the toxic effect of high salinity.”

  Scientific American

  It’s quite a complex issue.

  source
• IndiBrony@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

  I’m sure Pakistan would be happy to help 👀

  source