Rothwell Water Co., Ltd.

MCSBR (Modified-CSBR, NET Certification No.585 Verification No. 285, Patent No.10-2361659)

Expand the treatment capacity plant that has reached its treatment limit by up to 150%
with the MCSBR unit process using the existing method.

* Net name : Advanced biological sewage treatment technology combining functional media and cyclone

Features

To strengthen sludge settling and improve treatment efficiency :

Aerobic tank improvement > Introducing functional media for the growth of attached microorganisms
Sludge return line improvement > Application of hydrocyclone to sludge return system for improved sludge settling characteristics and denitrification ability
Non-stop operation of existing treatment facility > Facility enhancement within 6 months of construction period without structural changes and without treatment interruption

Hydrocyclone (Degassing system) Principle (Patent No.10-2361659)

The oversaturated nitrogen and oxygen in the sludge during the aeration process is removed with the hydrocyclone due to the pump head pressure difference . The sludge is effectively desorbed and circulated back into the reactor, improving the denitrification and phosphorus removal mechanisms and improving sludge concentration and sedimentation performance, enabling more than 30% increase in treatment capacity.

Activated Sludge Decompression / Degassing Sedimentation Test Results

Proof that only sludge degassed under reduced pressure maintains a stable interface.

Natural sedimentation

Sedimentation after areation

Sedimentation afrter decompression

Case Study of Samsung Electronics’ Pyeongtaek Godeok Industrial Complex Semiconductor Wastewater Treatment Facility (Phase 1):
Expansion of existing facility capacity from 102,000 tons/day to 120,000 tons/day using MCSBR Process

Client Requirements

It was necessary to expand the existing Wastewater Treatment plant due to the expansion of the Pyeongtaek Semiconductor Factory following the withdrawal of China/Vietnam.
However the site of the existing Wastewater Treatment Plant was too small, so relocation/new construction would delay the main factory plan up to 5 years.
> After a six-month global technology survey conducted by Samsung Electronics, Rothwell Water's NET excellent environmental technology was Selected as the optimal solution.

Facility Conditions:

① No Change of existing structure
② No Discontinuation of treatment plant operations
③ Expansion constructioncompleted within 6 months
④ Mandatory start up: 6 months

Applied Photos Hydrocyclone10m3/min×6ea installed (2ea per train)

Application results

MCSBR technology was applied to the above ground area of the Wastewater Treatment Plant to meet the facility conditions.
The over all construction cost was 20% compared to the cost of a new installation;
treated water quality values were below the design standards;
and a treatment capacity increase of 120% or more was perfectly achieved in a period of 6 months of construction
and 6 months of performance guarantee test run.

[SV30 measurement results before and after applying the MCSBR process] Significantly improved sludge settling and sludge condition

SV30 Before application Aerobic tank series 1,2, and 3, December 2021

SV30 After application Aerobic tank series 1,2, and 3, Jenuary 2022

Changes in Water quality of bioreactor after applying NET

Even though wastewater inflow increased by 33%, the quality of the bioreactor treated water improved by more than 20%
on average after applying MSCBR new technology.

K-5B Functional Media with Enhanced Microbial Adhesion (Patent No. 10-1927520)

Korean design patent K-5 Media (“Microbial House”) has lately been adopted for MBBR Process of Veolia Water. Similarly, Rothwell has succeeded in developing the world's best functional media K-5B having 30% more adhesion capacity for microbes than K-5 by blending the trehalose substance, which is in the spotlight as a moisturizer in cosmetic’s industry, into the media using a special blending know-how.

Media manufacturing process

01

Mystery of vitality 'Jericho',
the rose in the deser
02

Injection Molding Machiner
03

Trehalose Nutrient powder +
Raw HDPE
04

K-5B Media

Authentication / Verification Performance

Once microbial attachment is completed, K5-B boasts more than 30% adhesion capacity compared to K-5.

K - 5B

K - 5

Case study of Goyang City Byeokje Sewage
Treatment Plant : Expansion from 30,000 tons/day
to 31,200 tons/day

Comparison of design operating conditions before and after application
of NET / MCSBR Reason for applying new NET: Increased inflow load at treatment plant

Item	Unit	Before applying NET (Existing facility)		After applying NET
Item	Unit	Influent water quality	Effluent guaranteed water quality	Influent water quality	Effluent guaranteed water quality
Flow rate	m3/d	30,000		31,200
Temperature	℃	15		12
BOD	mg/L	125.0	10.0	211.0	5.0
CODMn		118.0	15.0	189.9	15.0
SS		118.0	10.0	225.3	5.0
T-N		26.4	15.0	46.1	15.0
T-P		4.6	2.0	7.3	0.3

Results of MCSBR application

KRW 4 billion saved compared to new construction costs.

Resolving increased pollution load problem.

1 year of construction.

BOD, TSS, COD, T-N, T-P stable discharge conditions are met despite a 111% increase in flow rate and 150% increase in average design water quality.

Implementation of nearby LH corporation housing site development plan became feasible.