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A waterjet system in accordance with a particular embodiment includes a pressurizing device configured to pressurize a fluid, a cutting head downstream from the pressurizing device, and a catcher positioned to collect a jet from the cutting head. The system can further include a treatment assembly c

A waterjet system in accordance with a particular embodiment includes a pressurizing device configured to pressurize a fluid, a cutting head downstream from the pressurizing device, and a catcher positioned to collect a jet from the cutting head. The system can further include a treatment assembly configured to treat a feed fluid to the pressurizing device and/or a byproduct fluid from the catcher, such as by removing submicron colloidal particles from the feed fluid and/or from the byproduct fluid. For example, the treatment assembly can include a coagulation unit, such as a chemical coagulation unit or an electrocoagulation unit, configured to coagulate the submicron colloidal particles. The pressurizing device, the cutting head, and the treatment assembly can be at different respective portions of a fluid-recycling loop.

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1. A method, comprising: pressurizing a fluid to a pressure greater than 30,000 psi at a first portion of a fluid-recycling loop;forming the fluid into a jet and directing the jet toward a workpiece such that the jet impacts the workpiece and abrasive particles within the jet break apart into submic

1. A method, comprising: pressurizing a fluid to a pressure greater than 30,000 psi at a first portion of a fluid-recycling loop;forming the fluid into a jet and directing the jet toward a workpiece such that the jet impacts the workpiece and abrasive particles within the jet break apart into submicron fragments at a second portion of the fluid-recycling loop, the second portion being downstream from the first portion during a pass through the fluid-recycling loop originating at the first portion; andtreating the fluid at a third portion of the fluid-recycling loop, the third portion being downstream from the second portion and upstream from the first portion during the pass through the fluid-recycling loop, wherein treating the fluid includes— coagulating the submicron fragments to form coagulated submicron fragments in the fluid, wherein coagulating the submicron fragments includes coagulating at least 90% by count of all of the submicron fragments of sieve diameter within a range from 0.005 to 0.2 microns in a given volume of the fluid, anddecreasing a concentration of the coagulated submicron fragments in the fluid. 2. The method of claim 1 wherein coagulating the submicron fragments includes coagulating the submicron fragments using a chemical coagulant added to the fluid. 3. The method of claim 2 wherein the chemical coagulant is a salt that is soluble in the fluid at room temperature and neutral pH to form a metallic ion and a counter ion. 4. The method of claim 3 wherein: the submicron fragments include garnet; andthe metallic ion is iron. 5. The method of claim 3 wherein: the submicron fragments include garnet; andthe metallic ion is copper. 6. The method of claim 1 wherein pressurizing the fluid includes pressurizing the fluid to a pressure within a range from 30,000 psi to 120,000 psi at the first portion of the fluid-recycling loop. 7. A method, comprising: pressurizing a fluid to a pressure greater than 30,000 psi at a first portion of a fluid-recycling loop;forming the fluid into a jet and directing the jet toward a workpiece such that the jet impacts the workpiece and abrasive particles within the jet break apart into submicron fragments at a second portion of the fluid-recycling loop, the second portion being downstream from the first portion during a pass through the fluid-recycling loop originating at the first portion; andtreating the fluid at a third portion of the fluid-recycling loop, the third portion being downstream from the second portion and upstream from the first portion during the pass through the fluid-recycling loop,wherein— treating the fluid includes— coagulating the submicron fragments to form coagulated submicron fragments in the fluid, anddecreasing a concentration of the coagulated submicron fragments in the fluid, andtreating the fluid reduces a turbidity of the fluid from a first turbidity to a second turbidity; the first turbidity being greater than 1000 nephelometric turbidity units, and the second turbidity beings less than 5 nephelometric turbidity units. 8. The method of claim 7, further comprising measuring a turbidity of the fluid at a fourth portion of the fluid-recycling loop, the fourth portion being downstream from the third portion and upstream from the first portion during the pass through the fluid-recycling loop. 9. The method of claim 8 wherein measuring the turbidity includes measuring an optical property of the fluid. 10. The method of claim 8, further comprising diverting the fluid from a course through the fluid-recycling loop based on the measured turbidity. 11. The method of claim 10 wherein: coagulating the submicron fragments includes coagulating the submicron fragments within a coagulation unit of a treatment assembly; anddiverting the fluid includes recirculating the fluid through the coagulation unit. 12. The method of claim 7 wherein pressurizing the fluid includes pressurizing the fluid to a pressure within a range from 30,000 psi to 120,000 psi at the first portion of the fluid-recycling loop. 13. A method, comprising: pressurizing a fluid to a pressure greater than 30,000 psi at a first portion of a fluid-recycling loop;forming the fluid into a jet and directing the jet toward a workpiece such that the jet impacts the workpiece and abrasive particles within the jet break apart into submicron fragments at a second portion of the fluid-recycling loop, the second portion being downstream from the first portion during a pass through the fluid-recycling loop originating at the first portion;treating the fluid at a third portion of the fluid-recycling loop, the third portion being downstream from the second portion and upstream from the first portion during the pass through the fluid-recycling loop, wherein treating the fluid includes— coagulating the submicron fragments to form coagulated submicron fragments in the fluid, anddecreasing a concentration of the coagulated submicron fragments in the fluid; andintroducing makeup fluid into the fluid-recycling loop at a steady-state flowrate less than 2% of an overall steady-state flowrate of the fluid within the fluid-recycling loop. 14. The method of claim 13, further comprising collecting the fluid within a reservoir at a fourth portion of the fluid-recycling loop, the fourth portion being downstream from the third portion and upstream from the first portion during the pass through the fluid-recycling loop. 15. The method of claim 13 wherein pressurizing the fluid includes pressurizing the fluid to a pressure within a range from 30,000 psi to 120,000 psi at the first portion of the fluid-recycling loop. 16. A method, comprising: pressurizing a fluid to a pressure greater than 30,000 psi at a first portion of a fluid-recycling loop;forming the fluid into a jet and directing the jet toward a workpiece such that the jet impacts the workpiece and abrasive particles within the jet break apart into submicron fragments at a second portion of the fluid-recycling loop, the second portion being downstream from the first portion during a pass through the fluid-recycling loop originating at the first portion; andtreating the fluid at a third portion of the fluid-recycling loop, the third portion being downstream from the second portion and upstream from the first portion during the pass through the fluid-recycling loop, wherein treating the fluid includes— coagulating the submicron fragments to form coagulated submicron fragments in the fluid, anddecreasing a concentration of the coagulated submicron fragments in the fluid, wherein decreasing the concentration of the coagulated submicron fragments includes concentrating the coagulated submicron fragments into a volume of concentrate. 17. The method of claim 16 wherein a primary flowpath of the third portion of the fluid-recycling loop passes through the volume of concentrate. 18. The method of claim 16 wherein decreasing the concentration of the coagulated submicron fragments includes filtering the fluid using a super-micron filter. 19. The method of claim 16 wherein pressurizing the fluid includes pressurizing the fluid to a pressure within a range from 30,000 psi to 120,000 psi at the first portion of the fluid-recycling loop. 20. A method, comprising: collecting a fluid contaminated with pulverized abrasive material in a catcher of a waterjet system;adding a chemical coagulant to the fluid so as to form coagulated pulverized abrasive material in the fluid, the chemical coagulant being soluble in the fluid to form a metallic ion and a counter ion, the metallic ion including iron, tin, copper, and/or silver; anddecreasing a concentration of the coagulated pulverized abrasive material in the fluid,wherein— the fluid contaminated with the pulverized abrasive material has a turbidity greater than 1000 nephelometric turbidity units; andthe fluid with the concentration of the coagulated pulverized abrasive material decreased has a turbidity is less than 5 nephelometric turbidity units. 21. The method of claim 20, further comprising recycling the fluid for reuse in the waterjet system. 22. A method, comprising: collecting a fluid contaminated with pulverized abrasive material in a catcher of a waterjet system;adding a chemical coagulant to the fluid so as to form coagulated pulverized abrasive material in the fluid, the chemical coagulant being soluble in the fluid to form a metallic ion and a counter ion, the metallic ion including iron, tin, copper, and/or silver, wherein adding the chemical coagulant includes adding the chemical coagulant to cause a molar concentration of the metallic ion in the fluid to be greater than 0.1 millimolar; anddecreasing a concentration of the coagulated pulverized abrasive material in the fluid. 23. The method of claim 22 wherein the metallic ion includes copper. 24. The method of claim 22 wherein the chemical coagulant is copper(II) sulfate. 25. The method of claim 21, further comprising pressurizing the recycled fluid to a pressure greater than 30,000 psi. 26. The method of claim 25 wherein pressurizing the recycled fluid includes pressurizing the recycled fluid using a direct-drive plunger pump. 27. The method of claim 22, further comprising decreasing a concentration of the metallic ion in the fluid. 28. The method of claim 27 wherein decreasing the concentration of the metallic ion includes contacting the fluid and a molecular sieve. 29. A waterjet system, comprising: a pressurizing device configured to pressurize a fluid to greater than 30,000 psi;a cutting head downstream from the pressurizing device, the cutting head being configured to direct a jet including the fluid toward a workpiece;a catcher positioned to collect the jet;a treatment assembly including a coagulation unit; anda turbidity sensor,wherein— the treatment assembly is configured to receive a contaminated fluid from the catcher and to remove submicron colloidal particles from the contaminated fluid to form a treated fluid,the treatment assembly, the pressurizing device, and the catcher are operably associated with one another within a fluid-recycling loop, andthe turbidity sensor is operably connected to the fluid-recycling loop downstream from the coagulation unit and upstream from the pressurizing device. 30. The system of claim 29 wherein: the treatment assembly includes a separation unit downstream from the coagulation unit;the coagulation unit is configured to coagulate the submicron colloidal particles; andthe separation unit is configured to separate at least a portion of the coagulated submicron colloidal particles from the contaminated fluid to form a treated fluid. 31. The system of claim 30 wherein the separation unit includes an in-stream filter. 32. The system of claim 29 wherein the pressurizing device is configured to pressurize a fluid to a pressure within a range from 30,000 psi to 120,000 psi.