NOVELTY - A system for processing biomass, has water-impermeable bottom liner, gravel layer supported by bottom liner, drain pipe disposed within gravel layer, biomass input device operable to deliver biomass over gravel layer to form biomass pile, lime input device operable to deliver lime to biomass for pretreating biomass, distribution pipe elevated above gravel layer, and pump operable to circulate water through biomass pile.    USE - (I) is useful for processing biomass. (M1) is useful for biomass pretreatment. (M3) is useful for producing paper or cardboard from the biomass (claimed). (I) is useful for storage, pretreatment and enzymatic digestion such as fermentation of biomass. (I) is useful for treating biomass, preferably lignocellulosic biomass with lime or other alkali to produce useful recovery products.    DETAILED DESCRIPTION - A system (I) (100) for processing biomass, has    (a) a water-impermeable bottom liner (102), a gravel layer (105) supported by the bottom liner, a drain pipe (106) disposed within the gravel layer, a biomass input device (108) operable to deliver biomass over the gravel layer to form a biomass pile (105), a lime input device (110) operable to deliver lime to the biomass for pretreating the biomass, a distribution pipe (114) elevated above the gravel layer, and a pump operable to circulate water through the biomass pile by delivering water to the distribution pipe and receiving water from the drain pipe after it has traveled through the biomass pile;    (b) a water-impermeable bottom liner, a grid-like lattice structure coupled to the bottom liner to form a roof, a geomembrane coupled to the grid-like lattice structure, a gravel layer supported by the bottom liner, several of drain pipe disposed within the gravel layer, a conveyor belt coupled to the top liner and operable to deliver biomass over the gravel layer to form a biomass pile, a lime input device operable to deliver lime to the biomass for pretreating the biomass, several of distribution pipes coupled to the top line and associated with respective ones of the several of the drain pipes, and several of pumps coupled to respective ones of the several of drain pumps and distribution pipes, the pumps operable to circulate water through the biomass pile by delivering water to the distribution pipes and receiving water from the drain pipes after the water has traveled through the biomass pile;    (c) an end wall, a water-impermeable bottom liner, a top liner coupled to the bottom liner, the top liner selectively inflatable by one or more fans coupled to the end wall, several of water pouches coupled to the top liner, the water pouches selectively inflatable when the top liner is inflated, a gravel layer supported by bottom liner and separated into several of gravel segments, a conveyor belt associated with the end wall and operable to deliver biomass over the gravel segments to form a biomass pile, a lime input device operable to deliver lime to the biomass for pretreating the biomass, several of distribution pipes coupled to the top liner and associated with respective ones of the several of gravel segments, and several of pumps as described above;    (d) several of geodesic domes arranged in a generally circular pattern, each geodesic dome comprising, a water-impermeable bottom liner, a top liner coupled to the bottom liner, a gravel layer supported by the bottom liner, a drain pipe disposed within the gravel layer, and a distribution pipe elevated above the gravel layer, several of pumps coupled to respective ones of the several of geodesic domes, each pump operable to circulate water through its respective geodesic dome by delivering water to the distribution pipe associated with the respective geodesic dome and receiving water from the drain pipe associated with the respective geodesic dome, a rotatable conveyor belt surrounded by the geodesic domes and operable to deliver biomass to each geodesic dome, and a lime input device operable to deliver lime to the biomass for pretreating the biomass; or    (e) a fermenter structure configured to accept and store untreated lignocellulosic biomass, pretreat the lignocellulosic biomass with lime at a temperature between approximately 25 degrees C and 95 degrees C at ambient pressure for a time period of at least approximately four weeks, and treat the lignocellulosic biomass with an inoculant.    INDEPENDENT CLAIMS are also included for the following:    (1) biomass pretreatment (M1) involves adding an alkali to biomass with lignin content to produce a mixture, and incubating the mixture at a temperature between approximately 25 degrees C and 95 degrees C at ambient pressure;    (2) producing (M2) enzymatically digestible biomass, involves adding lime to biomass with lignin content to produce a mixture, incubating the mixture at a temperature between approximately 25 degrees C and 55 degrees C at ambient pressure for a time period of at least approximately 4-16 weeks, circulating water through the mixture during incubation; and    (3) producing (M3) pulp involves adding lime to biomass with lignin content to produce a mixture, incubating the mixture at a temperature between approximately 45 degrees C and 55 degrees C at ambient pressure for a time period of approximately 10 weeks, circulating water through the mixture during incubation.    DESCRIPTION OF DRAWING(S) - The figure shows schematic representation of a system for processing biomass.    system (100)    bottom liner (102)    gravel layer (104)    biomass pile (105)    drain pipe (106)    biomass input device (108)    lime input device (110)    distribution pipe (114)    inoculum supply (120)    air blower (124)    container (126)    heat exchanger (128)