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コーワ商事

capital1000Ten thousand
addressOsaka/Nishi-ku, Osaka-shi/5 Kowa Edobori Building, 1-21-7 Edobori
phone06-4256-5460
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last updated:Jul 16, 2025
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Drainage treatment system Drainage treatment system
Turbo blower, turbo compressor Turbo blower, turbo compressor
Floating rotary turbo blower and turbo compressor Floating rotary turbo blower and turbo compressor
Low resistance ventilation device Low resistance ventilation device
Deodorizing and dustproof system Deodorizing and dustproof system
Plant-based cleaning solution Plant-based cleaning solution
Heat-insulating and thermal insulation paint Heat-insulating and thermal insulation paint
Drainage

Drainage treatment system

Kowa Shoji proposes cutting-edge water treatment systems utilizing innovative technologies such as "electrolysis" and "ultrafine bubbles." We achieve optimal solutions that balance high effectiveness with low cost and space-saving features.

Proposal for wastewater treatment equipment that leads to cost reduction.

Introducing examples of construction for drainage treatment facilities, coagulation sedimentation facilities, and nitrification-denitrification facilities!

We introduce examples of wastewater treatment facilities, coagulation and sedimentation equipment for chemical plants, nitrification and denitrification facilities, and wastewater treatment projects for food processing companies, metal processing factories, and food processing plants using the 'Bio-RESE System.' 【Case Studies - Excerpt from Catalog】 ■ Wastewater Treatment Facility Project for Metal Processing Factory <BIO-RESE Installation> - Location: Osaka Prefecture - Wastewater Components: Oil-containing (mainly mineral oil) - Treatment Method: Custom-made microbial treatment Using mineral oil-decomposing bacteria to break down mineral oil, which has been considered difficult to decompose - Treatment Capacity: 150 m³/day *For more details, please refer to the PDF document or feel free to contact us.

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Ultrafine Tornado Bubble Generation Wastewater Treatment System

Achieved annual cost savings of 12 million yen! With ultra-fine tornado bubbles, we realize cost reduction in wastewater treatment and maintenance-free operation!

Recommended for those with such challenges and issues! Want to purify industrial wastewater at low cost... Want to treat concentrated wastewater like sludge and urine... Want to reduce maintenance associated with wastewater treatment... This system generates ultra-fine tornado bubbles that vigorously agitate sludge. Furthermore, it efficiently activates aerobic bacteria for decomposition and purification. Thanks to the airlift effect and bioactivity, it achieves a reduction in sludge and stable results. Maintenance is also easy, and power consumption is significantly reduced. ◎ We are currently offering free rental of demo units. Please contact us if you are interested. 【Features】 ■ Over 20% high oxygen dissolution efficiency ⇒ Reduction in electricity consumption and CO2 emissions ■ Low pressure loss ⇒ Up to 50% reduction in power consumption compared to diffusers ■ Reduction of accumulated sludge through airlift effect ⇒ Reduction in cleaning costs, industrial waste disposal costs, and CO2 emissions ■ Reduction of hydrogen sulfide and foul odors ⇒ Measures against neighboring issues, pest control, and prevention of poisoning accidents ■ Long-term durability (about 5 times that of diffusers) ⇒ Reduction in long cycle costs ■ Structure resistant to clogging ⇒ Reduction in maintenance costs and labor costs *For more details, please request materials or view the PDF data available for download.

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Wastewater Treatment Technology "Bio-RESE System"

Efficiently prepare and purify the environment in a short time! Keep initial and running costs low and achieve significant cost reductions.

The "Bio-RESE System" can process high concentrations of organic matter using custom-made microorganisms. At the same time, it can reduce the downsizing of facilities and the amount of sludge generated. It can be added to existing equipment, and since there is no need for a specialized manager for maintenance, both installation costs and running costs can be kept low. We will help you achieve significant cost reductions with the BIO-RESE system. 【Features of Custom-Made Microorganisms】 We develop microorganisms that continuously work effectively according to each wastewater facility! - We have collected and preserved over 5,000 types of microorganisms from around the world, from which we create custom-made microorganisms. - Among them, there are heat-resistant and salt-resistant microorganisms, so we can handle not only high-load organic matter but also wastewater with high salinity and high-temperature wastewater treatment. - No genetic modification is performed at all. - While decomposing BOD/COD by 80-95%, we also reduce excess sludge by 70-80% compared to conventional methods. *For more details, please refer to the PDF document or feel free to contact us.

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Case Study of Epoxy Manufacturing Plant: 'BIO-RESE System'

Attention chemical manufacturers! With custom-made microorganisms for complete decomposition, a significant reduction in sludge generation during wastewater treatment is possible!

The "BIO-RESE System" targets pollutants contained in wastewater and develops and breeds custom-made microorganisms with particularly high purification capabilities. By artificially introducing them to contaminated sites and maximizing the microorganisms' abilities using a biojet reactor system, we efficiently purify and restore the environment in a short time. It can be added to existing facilities, and there is no need for specialized maintenance personnel, which helps keep both installation and running costs low. We assist in achieving significant cost reductions with the BIO-RESE System. [Case Study] Epoxy Manufacturing Plant (Thailand) Type of wastewater: High concentration salt, high concentration chemical organic matter Wastewater volume: 150³/day *For more details, please download the PDF or feel free to contact us.

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Case Study of Essential Oil Factory: 'BIO-RESE System'

Case introduction! Significant reduction in sludge generation in wastewater treatment is possible with complete decomposition using custom-made microorganisms.

The "BIO-RESE System" targets pollutants contained in wastewater and develops and breeds custom-made microorganisms with particularly high purification capabilities. By artificially introducing them into contaminated sites and maximizing the microorganisms' abilities using a biojet reactor system, we efficiently purify the environment in a short time. It can be added to existing facilities, and there is no need for a specialized manager for maintenance, which helps keep both installation and running costs low. We assist in achieving significant cost reductions with the BIO-RESE System. [Case Study] Essential Oil Factory (Hyogo Prefecture) Type of wastewater: High-concentration plant oils Wastewater volume: 300³/day *For more details, please download the PDF or feel free to contact us.

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Case Study of Mirin Factory: 'BIO-RESE System'

A must-see for food factories! With custom-made microorganisms for complete decomposition, it is possible to significantly reduce the amount of sludge generated in wastewater treatment!

The "BIO-RESE System" targets pollutants contained in wastewater and develops and breeds custom-made microorganisms with particularly high purification capabilities. By artificially introducing them into contaminated sites and maximizing the microorganisms' abilities using a biojet reactor system, we efficiently purify and restore the environment in a short time. It can be added to existing facilities, and there is no need for a specialized manager for maintenance, which helps keep both installation and running costs low. We assist in achieving significant cost reductions with the BIO-RESE System. [Case Study] Mirin Factory (Malaysia) Type of wastewater: High-concentration starch Wastewater volume: 300³/day *For more details, please download the PDF or feel free to contact us.

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Case Study of a Seasoning Factory: 'BIO-RESE System'

A must-see for food factories! With custom-made microorganisms for complete decomposition, it is possible to significantly reduce the amount of sludge generated in wastewater treatment!

The "BIO-RESE System" targets pollutants contained in wastewater and develops and breeds custom-made microorganisms with particularly high purification capabilities. By artificially introducing them to contaminated sites and maximizing the microorganisms' abilities using a biojet reactor system, we efficiently and quickly restore and purify the environment. It can be added to existing facilities, and there is no need for a dedicated maintenance manager, which helps keep installation and running costs low. We assist in achieving significant cost reductions with the BIO-RESE System. [Case Study] Seasoning Factory (Kyoto Prefecture) Type of wastewater: High concentration of salt Wastewater volume: 70m³/day *For more details, please download the PDF or feel free to contact us.

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80% reduction in excess sludge generation possible! 'BIO-RESE System'

Custom-made microorganisms enable a significant reduction in sludge generation during wastewater treatment through complete decomposition!

The BIO-RESE system stands for Bio Remediation for Save the Earth, and as the name suggests, it is a technology for environmental restoration using microorganisms. Targeting pollutants contained in factory wastewater and based on 40 years of experience from the Osaka Institute of Biological and Environmental Sciences, this method involves researching, developing, and introducing microorganisms that specifically decompose pollutants (custom-made microorganisms). 【Features】 ● It is possible to reduce excess sludge generation by approximately 80% compared to conventional activated sludge methods. ● Equipment improvement can be achieved simply by adding a bioreactor to existing facilities and introducing custom-made microorganisms. ● By introducing microorganisms tailored to the pollutants, effective and cost-efficient management is possible. ● Treatment of high-salinity wastewater, which was not possible with conventional biological treatment methods, is achievable. ● It can be implemented in open systems, not just closed systems. *For more details, please download the PDF or feel free to contact us.

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Wastewater purification technology using microorganisms: 'BIO-RESE System'

Attention food factories! With custom-made microorganisms for complete decomposition, a significant reduction in sludge generation from wastewater treatment is possible!

In recent years, due to the increased awareness of environmental issues, regulations on wastewater discharge for manufacturing companies have become stricter. In this context, the BIO-RESE system has been developed. This system targets the pollutants contained in wastewater by developing and breeding custom-made microorganisms with particularly high purification capabilities. These microorganisms are artificially introduced into contaminated sites, and by maximizing their abilities using a biojet reactor device, the environment can be efficiently restored and purified in a short time. For example: - Large amounts of sludge are generated - The maintenance and management of activated sludge have become costly - The salinity of the wastewater is high, resulting in poor biological treatment efficiency - There are odor issues such as ammonia and hydrogen sulfide We develop microorganisms that can address these individual problems and provide solutions. Additionally, the system can be added to existing facilities, and there is no need for specialized maintenance personnel, which helps keep both installation and running costs low. The BIO-RESE system assists in achieving significant cost reductions. *For more details, please download the PDF or feel free to contact us.*

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Decompression dehydration drying device

Reduce factory wastewater by over 96%! Lower industrial processing costs and expand the scope of wastewater reuse.

At Kowa Shoji, we handle the "Vacuum Dehydration Drying Device" that purifies waste liquid through dehydration and drying. This device separates moisture from concentrated waste liquids and high-water-content sludge using a vacuum distillation method, contributing to the reduction of industrial waste volume and the reuse of wastewater. The drive unit is maintenance-free with only a pump, and pre-adjustment of the treated sludge is unnecessary, allowing for automatic operation in both "batch" and "continuous" modes. Additionally, by adding a weighing unit, the concentration ratio can be set arbitrarily, improving efficiency. 【Features】 ■ Automatic operation in both "batch" and "continuous" modes ■ Maintenance-free drive unit with only a pump ■ Fully automatic operation with an automatic discharge mechanism for residual sludge ■ Possible moisture content of 1-5% in the processed cake ■ In batch operation, adjustment of moisture levels is possible *For more details, please refer to the PDF document or feel free to contact us.

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Nitrate reaction endpoint detection device 'OUR-N'

Optimize power consumption by suppressing unnecessary aeration! When used in conjunction with MD, it can reduce electricity consumption from aeration by up to 50-55%!

"OUR-N" is a smart technology that monitors the nitrification reaction in SBR through oxygen utilization rate measurement. By continuously measuring the oxygen consumption rate of microorganisms in SBR (Sequencing Batch Reactor) facilities, it appropriately controls the on/off of the blower, reducing energy consumption during aeration by 30-40% compared to conventional methods. (Based on field test results at wastewater treatment plants) Utilizing the oxygen consumption rate of microorganisms, it enables monitoring of the endpoint of the nitrification reaction and control of the aeration on/off. [Features] ■ Continuous measurement of the oxygen consumption rate of microorganisms in SBR facilities ■ Appropriate control of the blower on/off ■ Reduction of energy consumption during aeration by 30-40% compared to conventional methods *For more details, please refer to the PDF materials or feel free to contact us.

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[Example of Problem Solving] Sludge volume reduction, improvement of bulking in sedimentation tanks, odor removal

We will introduce case studies that solve issues related to cost reduction and difficult decomposition processing.

At a food factory that produces frozen dumplings and gyudon ingredients, issues arose due to the deterioration of sludge sedimentation, leading to sludge overflow and odor problems. Complaints were received from nearby residents, and we were consulted on how to address the situation. Among various countermeasure proposals, we chose a method focused on oil removal and made our suggestions. (We also considered sludge reduction in our proposal.) We utilized a special oil-decomposing microorganism to treat the oil and suspended solids (SS). As a result, the sedimentation of the sludge improved, and the quality of the treated water increased. Complaints from nearby residents ceased entirely, and a sludge reduction rate of 77% was achieved. 【Case Study】 ■ Food Factory ■ Issues - Deterioration of sludge sedimentation leading to sludge overflow and odor generation - Large amounts of animal and vegetable oils mixed in, making treatment difficult *For more details, please refer to the PDF document or feel free to contact us.

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[Example of Problem Solving] Reuse of Treated Water at Landfill Sites

We will introduce case studies that solve issues related to difficult decomposition processes and water reuse.

There was a request from a plant manufacturer to treat the concentrated water that comes from the RO membrane treatment of leachate from a landfill. The requester had a plan to reuse the leachate treatment water from the landfill, but the salinity of the treated water was too high for reuse. Therefore, we proposed to treat the concentrated liquid, which accounts for 40% of the treated water discharged from the RO membrane, using a vacuum distillation unit called "Gen," to separate the concentrated liquid into distilled water and salt. As a result, the landfill, which had difficulty securing water in the mountains, was able to conserve valuable water resources and easily secure the necessary water volume through this method. [Case Study] ■ Request: To treat the concentrated water that comes from the RO membrane treatment of leachate from the landfill ■ Proposal: Proposed the vacuum distillation unit "Gen" ■ Implementation Effect: Valuable water resources were conserved, and securing the necessary water volume became easier. *For more details, please refer to the PDF document or feel free to contact us.

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[Example of Problem Solving] Treatment of Plum Flavoring Waste Liquid (High Salt Concentration)

Introducing case studies that solve issues such as installation space, cost reduction, and difficult disassembly processing!

The seasoned plum waste liquid had high salt and BOD concentrations, leading to ongoing troubles and increasing costs. Additionally, the seasoned waste liquid was also strong acid waste, and processing it as industrial waste resulted in significantly high costs. At that time, the daily volume of waste liquid classified as industrial waste was 3m3, with a processing cost of ¥90,000 per day. Therefore, we proposed the "Bio-RESE" system using special microorganisms (halophiles) that can handle high-salt waste liquids. Without changing the capacity of the existing aeration tank, we repurposed the circulation tank from an overflow tank to establish the BJ system. As a result, we achieved a BOD decomposition of 450 kg per day. [Case Study] ■ Industry: Manufacturing of pickled plums, a local industry in Wakayama ■ Inquiry: Treatment of seasoned waste liquid *For more details, please refer to the PDF document or feel free to contact us.

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"Taiyo Purification Center Ume no Sato," a facility specializing in the seasoning liquid treatment of pickled plums.

Introducing case studies that solve problems related to cost reduction and difficult decomposition processing!

The "Sun Purification Center Ume no Sato," designed by our company, is a facility specialized in the treatment of seasoning liquid generated during the production of pickled plums, a specialty product of Wakayama Prefecture. The high-salinity wastewater (up to 15% salt concentration) produced from the process of making seasoned pickled plums was previously disposed of as industrial waste outside the region. In response to the demand to "process the seasoning wastewater locally," it was decided to construct the facility in Ichinose, Kamitonda Town. The seasoning liquid collected from the pickled plum processing factory is adjusted to a pH suitable for microbial treatment, and organic matter is decomposed and removed using specialized microorganisms (halophilic bacteria). The microbial treatment process is repeated, and after removing fine debris, it is confirmed that the treated water meets the discharge standards before being released into the river. In the event of any abnormal readings, there are comprehensive measures in place to automatically halt the discharge into the river. [Case Study] ■ Proposal - Introduction of custom-made microorganisms that efficiently decompose even at high salt concentrations. ■ Implementation Effect - The concentration of organic matter in the treated water was significantly reduced below the discharge standards. *For more details, please refer to the PDF document or feel free to contact us.

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[Example of Problem Solving] Improvement of DO in Biological Treatment Tanks

We propose a method to increase the DO in the biological treatment tank! Achieve cost reduction and water quality stabilization!

A feed manufacturing company that uses waste oil (such as vegetable oil and fish oil) as raw material requested to increase the dissolved oxygen (DO) in the biological treatment tank without changing the airflow of the blower. The issue at this company's treatment facility is that fluctuations in the characteristics of the wastewater lead to variations in the load on the biological treatment process. Therefore, we proposed upgrading to a master diffuser, which has a higher oxygen transfer efficiency than the existing disc-type diffuser. To increase the DO without changing the existing aeration airflow (9.7 m³/min), it is necessary to enhance the oxygen transfer efficiency, which is why we switched from the current disc-type diffuser to the master diffuser (MD). The MD can produce fine bubbles with high oxygen transfer efficiency at a lower energy cost. [Case Study] - Feed manufacturing company using waste oil (such as vegetable oil and fish oil) - Request: Increase the DO in the biological treatment tank without changing the blower's airflow - Proposal: Master diffuser with higher oxygen transfer efficiency than the disc-type diffuser *For more details, please refer to the PDF document or feel free to contact us.

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[Case Study on Problem Solving] Cleaning Wastewater from a PET Bottle Recycling Plant

50% of the daily wastewater can be recycled! This can reduce the costs of industrial waste disposal.

Kowa Shoji is engaged in the proposal business for water treatment equipment and odor treatment equipment. As the export of waste plastics to overseas becomes stricter, the construction of processing plants in Japan is progressing rapidly. Last year, our company received orders from two companies for recycling plants for business-related PET bottles. Since an alkaline chemical solution is used during the cleaning process, the wastewater becomes strongly alkaline. Both companies are located in regions with very strict discharge standards for rivers and marine areas, which is why we proposed a treatment method that complies with the discharge standards of the rivers. 【Treatment Method】 Pressurized flotation treatment → Fluid carrier → Membrane separation → Discharge (partially reused) → Sedimentation → Dewatering → Industrial waste disposal 【Implementation Effects】 ■ 50% of the daily discharge water volume is reused Company U: 480 m³ → 240 m³ Company T: 720 m³ → 360 m³ The volume of industrial waste was reduced by concentrating the wastewater and applying dewatering treatment. *For more details, please refer to the PDF document or feel free to contact us.

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Decomposition even at high salt concentrations! A case study of wastewater treatment at a facility specializing in the processing of pickled plums.

Decomposing high-salinity wastewater (up to 15%) with microorganisms! We will introduce a case that solved the issues of cost reduction and difficult-to-decompose treatment.

The "Sun Purification Center Ume no Sato" is a facility specializing in the treatment of seasoning liquid generated during the production of pickled plums, a specialty product of Wakayama Prefecture. The high-salinity wastewater (up to 15% salt concentration) produced during the production process of seasoned pickled plums was previously disposed of as industrial waste outside the region. The facility was established in response to the desire to "process this seasoning wastewater locally." The seasoning liquid collected from the pickled plum processing factory is adjusted to a pH suitable for microbial treatment, and organic matter is decomposed and removed through treatment with specialized microorganisms (halophilic bacteria). The microbial treatment process is repeated, and after removing fine debris, it is confirmed that the water meets discharge standards before being released into rivers. In the event of any abnormal readings, there is a fail-safe measure in place that automatically halts the discharge into the river. [Case Study] ■ Proposal Introduction of custom-made microorganisms that efficiently decompose even at high salt concentrations. ■ Implementation Effect The organic matter concentration of the treated water was significantly reduced below discharge standards, resulting in a reduction of approximately 43% in the treatment costs of the seasoning wastewater, leading to cost savings.

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