Kuge, Hiro, Kuge

Kuge, Hiro

Kubota Hiro is a speaker at WEFTEC 2022.

Titles from this speaker

Description: Industrial Strength Reuse: Utilizing MBR+RO To Reduce Water Consumption By 70...

Industrial Strength Reuse: Utilizing MBR+RO To Reduce Water Consumption By 70 Percent At A Tractor Manufacturing Facility

Abstract

Membrane bioreactor (MBR) treatment has been applied to the industrial wastewater produced by the coating process at Kubota Industrial Equipment (KIE) in Jefferson, GA, as well as domestic wastewater from the office building. By adding a reverse osmosis (RO) skid downstream of the MBR, the effluent can be recycled. The total treated effluent is reused for the coating pre-treatment process; 27,000 gal/day is reused for the manufacturing process, reducing the need of public water from 37,000 to 10,000 gal/day (70% reduced by water reuse). The total reuse cycle can be seen in Figure 1. This system saves on total water consumption as well as operational costs incurred by water use in the coating process. The total wastewater is a combination of domestic grey water from the office building and pre-treated wastewater from the tractor coating process, that can produce up to 23,000 mg/L of BOD and 9,360 mg/L TSS. Industrial wastewater is pre-treated for oils and heavy metals by coagulation and pH adjustment, followed by a gas energy mixing system where solids and liquids are separated by flotation. The pre-treated industrial wastewater and office building grey water are then combined in an equalization tank and subjected to MBR. MBR treatment is accomplished in conjunction with an AO biological treatment with a single recycle from the membrane tank to the anoxic tank. Kubota microfiltration flat sheet submerged membrane units are employed in the membrane tank. BOD and TSS are treated by MBR to near non-detect levels; however total dissolved solids require further treatment. Therefore, the MBR effluent is treated by dual stage RO that can accomplish a reduction in electrical conductivity up to 99% (619 ÂµS/cm influent, 4.75 ÂµS/cm effluent). See a detailed illustration of the process flow in Figure 2. When MBR is combined with RO, the total effluent can be recycled and utilized. At KIE, the MBR plus RO process has been in operation for eight years and reduces manufacturing water consumption by 70% and decreases annual water costs by $50,000. This presentation will detail the industrial wastewater treatment and subsequent water reuse at the KIE plant in Jefferson, GA.

SpeakerKuge, Hiro

Presentation time

13:35:00

13:50:00

Session time

13:30:00

15:00:00

TopicIntermediate Level, Industrial Issues and Treatment Technologies, Sustainability and Climate Change, Water Reuse and Reclamation, Watershed Management, Water Quality, and Groundwater

Author(s)

Kuge, Hiro

Author(s)Hiro Kuge1; Larry Morris2; Yasushi Terao3

Author affiliation(s)Kubota Membrane USA Corporation, Bothell, WA1; Kubota Membrane USA Corporation, Canton, OH2; Kubota Membrane USA Corporation, Canton, OH3

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2022

DOI10.2175/193864718825158601

Volume / Issue

Content sourceWEFTEC

Word count18