Page 144 - Sustainability in the Process Industry Integration and Optimization

Ma s s I n t e g r a t i o n 121

Local treatment unit

Purified water
Freshwater
Purified water Freshwater
Wastewater
Storage n

Operation n Storage ww

Wastewater from continuous operation
Wastewater from central
storage tank for continuous
operation
FIGURE 5.5 Superstructure for water reuse and regeneration reuse in a
brewery plant (Tokos and Novak Pintarič, 2009).

Water for pouring

Filtration
TR

Cleaning in-place Cleaning in-place
system system

Fresh water
for batch processes
Water for pouring Wort boiling
Wastewater

Cellar Brewhouse

FIGURE 5.6 Water reuse opportunities in a brewery plant.

addition of any storage tanks. The net present value of the proposed
water network reconstruction is positive (at a 15 percent discount
rate), and the payback period is 0.29 years (about 15 weeks).
In the brewhouse and the cellar, the continuous water treatment
unit (nanofiltration) was selected for wastewater purification in the
optimum water network. Purification allows the water from batch
material pouring to be reused in the clean-in-place (CIP) system, and
wastewater from filtration could be reused directly for pouring the
batch material. All told, freshwater consumption could be reduced