Issue link: http://winesandvines.uberflip.com/i/235959
C Oi V Ee R A K O R G w n M S T IN Y mm from the waste stream. The screened wastewater flows by gravity into an integral sump where two multi-stage pumps transfer the screened wastewater to a 10,000-gallon equalization (EQ) tank prior to treatment in the membrane bioreactor (MBR) system supplied by bioprocessH2O. The EQ tank provides surge and wastewater storage capacity to receive wastewater at a flow rate of 35 gallons per minute (70 GPM peak) from the fine screen transfer pumps. This allows a continuous wastewater feed of about 5 GPM into the 10,000-gallon aeration tank where the aerobic biological treatment occurs (oxidation of biochemical oxygen demand). Wastewater in the aeration tank is biologically degraded by a population of heterotrophic bacteria and a diverse group of micro-organisms that consume the organic matter. The bacterial growth is regulated by the organic load entering the aeration tank and the amount of time the microorganisms remain within the system. Oxygen required for bacterial respiration is provided using positive displacement blowers, a fine bubble diffuser assembly and an automated dissolved oxygen (DO) control system. The control system measures the DO concentration within the aeration tank and responds by varying the amount of air supplied to the Dontech Industries Inc. stainless steel externally fed rotary drum screen model RDS-WW-2512 WC is pictured with an oversized sump designed specifically for Ridge Winery to handle a peak flow of 75 gpm while removing solids 500 micron (0.02 inch) or greater from winery processing water. Overall dimensions are 44 inches x 44 inches x 88 inches tall with a 25-inch screen diameter. Collection drum inside yellow plastic housing receives solids that are transferred to winery composting operation. 18 p r actic al w i ne ry & v i n e yard JANUARY 20 14 6 4 2 3 5 1 The bioprocessH2O system to treat wastewater includes an equalization tank [1], aeration tank [2], blowers [3], membrane hood [4], membrane skid, controls, chemical feed inside the shipping container [5], and sludge holding tank [6]. aeration tank using two variable speed drive (VSD) controlled blowers. The DO control system and VSD blowers are critical components to minimize power consumption. A pH sensor and external controller provide for automatic dosing of potassium hydroxide to maintain the aeration tank pH between 6.5 – 8.0 while nutrients (ammonia and phosphorus) are also supplied to supplement the micro-organism's metabolic requirements. Wastewater is pumped at a controlled rate from the aeration tank to a vertically configured bioPULSE ™ Airlift tubular membrane. Diffused air is injected at the bottom of the membrane module to create an airlift pumping action and provide air scouring of the membrane surface to enhance and maintain system performance. This approach of utilizing air and liquid to provide membrane scouring results in an energy efficient MBR. The semi-permeable polyvinylidene difluoride tubular ultrafiltration membranes have 5.2 mm diameter lumens with 0.03 micron pores passing clean water as ultrafiltration (UF) permeate. The bacteria and suspended solids commonly referred to as mixed-liquor suspended solids are rejected and returned to the aeration tank for multipass processing. The UF permeate is pumped from the membrane module at a controlled rate using a VSD permeate transfer pump that is limited by a level sensor to maintain a constant liquid level within the aeration tank. The UF permeate is discharged to a distribution system for irri- gation of grapevines and select trees in the vineyard. The tubular membrane lumens are periodically back-pulsed by actuating a permeate backwash pump to reverse the UF permeate flow through the pores to dislodge solids, reduce membrane biofouling and sustain the permeate flow rate referred to as flux (gallons of permeate produced per square foot of membrane per day). Additionally, the membrane lumens are typically cleaned once every four to eight weeks by a chemically enhanced backwash process. The entire process is automated using the PLC controller and monitored via a set of process viewing screens on an operator interface terminal. The treatment process is automated using an Allen Bradley PLC and monitored via a set of process viewing screens on a color touch screen operator interface terminal. The treatment system can be controlled remotely through the PLC via an internet connection that allows bioprocessH 2O to provide oversight and operational assistance to ensure successful system performance. BioprocessH2O installed the UF membrane system, PLC control panel and chemical feed assemblies within a customized 20-foot long shipping container that facilitated system installation and ongoing operation and maintenance. Biological sludge generated during the wastewater treatment process is digested on-site using an aerobic digestion tank that provides an environment in which the micro-organisms metabolize and consume a portion of the wasted biomass. PWV