1. Introduction
2. Wastewater treatment System inIndonesia
3. Future Work

1. Introduction

Earth Creative Co., Ltd is a waste and wastewater service company with the purpose ofcollecting, transporting and maintaining waste, especially sludge from wastewater treatment
facility. Currently, our business involved in recycling business and play a role in contributing
to a waste recycling society
Established: 1968
Profits: 530 Million JPY (2017)
Total Employee: More than 40
Average Age: 39 Years Old
Business Description: Waste Collection, Transportation & disposal, Wastewater
treatment plant Operational & Maintenance, Drainage Cleaning & Maintenance, Drinking Water

Ube City,Yamaguchi
Prefecture
Yamaguchi Prefecture is located at
the westernmost tip of Honshu
island, 800 km km from Tokyo.
Population is approximately 1.2
million people

２．Watewater treatment system inIndonesia

Case 1 : Hotel浄化槽内清掃

Case 2 : STP Before MaintenanceContractFlooded Wastewater treatment Plant

Blocked Submersible
Pump (EqualizationPump)

Case 3 Hotel Surveyand Investigation

Case 5 HotelCase 6 HotelCase 7 Food Processing Factory
20162018

Case 8 HotelCase 9 Restaurant (60 Seat)Case 10 Laundry Wastewater3. Future
ProjectInitiativeOperational & Maintenance of Wastewater Treatment
Plant & Sewage Treatment Plant
Work Detail・Inspection & Maintenance
Water quality status by hand device , pipe drainages, Operational unit
cleaning, Mechanical and electrical unit operational check, sludge andscum degeneration
・Adjustment
Water volume adjustment, air blower adjustment, etc.
・Mechanical, Electrical and Biological System Repair, Restart andReconditioning
Such as air blower, pumps, screens, crushers, manhole cover, controlpanel, etc.

Tools used during inspection
No

名称1pH Meter

2DO Meter

3

Chlorine Ion Meter

4

Residual Chlorine Meter

5

Nitrit, Nitrat & Ammonia Meter

6

SV Meter

7

Fluorometer

8

Disinfectant

9Cleaning Tools

MaintenanceStartedAir blower adjustment,sludge return
adjustment,, etc

Visual observationof odor, noise,water quality, etc.

Mechanical
Maintenance (Blower,Pump, control panel,etc)

Water quality
inspection of eachtank

Report inspection
result to costumer

WWTP/STP Inspection Process

WWTP/STP Inspection Process

WWTP/STP Inspection ProcessLarge Scale WWTP/STP

Home Scale Wastewater
Treatment SystemExample 1. Inspection of WWTP/STP in Hotel A

Flow rate Adjusment Box ; too little water return andexcessive water flow

After Adjustment

Water quality, equipment maintenanceWWTP changes in water quality before and aftermaintenance
Aeration Tank
SV

Effluent Water

No
Maintenance

BOD
40㎎/ℓ

Inlet Water
BOD
200㎎/ℓ

BOD
5㎎/ℓ
After
MaintenanceLiquid Film Aeration System(液膜曝気システム)
Test Result of Liquid Film Aerator System on sie
At the Hotel X, we installed 3-series and 5-series liquid film units in an aeration tank and conducted a demonstration
experiment. We collected basic information for the long-term demonstration test next year.

Only the liquid film unit part was brought in from Japan, and the blowers and pipes were procured locally, and two sets of 3units and 2 sets of 5 units were put into the aeration tank. (I changed the set in the middle to see the effect of unit size.)

The table below shows the results of blowing air by directly connecting existing 200W and 240W blowers to each device. (Seethe next page for the detailed layout and flow of treated water.)

Change in DO value due to the introduction of a liquid membrane device
February 8, 2020 Installed
2 units of triple liquid
membraneFebruary 12, 2020 Replacedwith 2 units of 5 consecutive
liquid membranes

Before introduction: DO from1.7mg/L(4 days later)
2/12 DO increased to 3.1mg/L

From 2/12 DO 3.1mg/L(7 days later)2/19 DO increased
to 4.4mg/L

Set of 5-unit and 3-unit

March 2, 2020
Switched to AS-25 (no liquid film
unit: control experiment)

The effect of theliquid film
aeration system
was confirmed.

From 3/2 DO 5.2mg/L(2 days later)
3/4 DO decreased to 3.9mg/L

Changing to a 5-consecutive liquid membrane device

ＡＳ-25

IoT Sensor
WWTP Remote Monitoring System
Equalization Tank:pH and TemperatureSensor
Aeration Tank:pH, DO and TemperatureSensor
Effluent Tank:pH and Temperature Sensor

Early Model

Improved / Upgraded Device Version