Challenge. Solution. Benefits

Transcription

1 Water recycling plant in China 01 As water shortage in urban areas in China is becoming a serious problem due to growing population in such areas, effective use of treated water is needed as a countermeasure to solve this problem. The purpose of this treatment system is reuse of the treated water, allowing the treated water to be discharged into the upstream of the dam. To this end, that can cut off SS almost 100% to obtain excellent water quality has been used. China Beijing Origin Water Technology Ltd. 45,000m 3 /d Domestic Sewage 2006 The sewage treated water by SBR(Sequencing Batch Reactor) is treated by (Membrane Bio Reactor) and then being discharged into the dam serving as a water supply resource. Screen Aeration tank Membrane separation tank UV Discharge to river head

2 Sewage treatment plant in Korea 02 This plant is located near Seoul, a growing megacity with a population of over 10 million, and its treatment capacity needs to be increased from 150,000 to 180,000m 3 /day; however, there is not enough land space. A significant land-saving is a critical factor for this project. Membrane Bio-Reactor () can reduce about 60% land space compared with conventional activated sludge process because can eliminate a secondary clarifier. Korea Hyundai Engineering Co., Ltd. 30,000m 3 /d Domestic Sewage 2008 makes it possible to utilize the limited land. Also, the treated water can be discharged to riverhead for improvement in the quality of river water. Screen Anoxic tank Anaerobic Aerobic Exhausted tank tank tank (Membrane separation tank) UV Discharge to riverhead

3 Industrial water recycling plant in Japan 03 Need to reduce industrial water quantity as part of the client s CSR programs. Reuse a part of the treated water for CIP makeup water and beer bottle container washing using reclaimed water from production lines with Membrane Bio-Reactor () and Reverse Osmosis (RO) technologies. Lower the client s water and wastewater bills in addition to contribution to their CSR activities. Japan 720m 3 /d As a part of production facility 2010 Plant Reuse (for non-product use only) Activated Carbon RO (Recovery Ratio: Approx.70%)

4 Do more with less upgrade of existing 04 The initially installed system equipped with a flat-sheet membrane was operated at a water flux rate higher than normal to process the influent more than originally planned. This situation brought an unstable system operation such as frequent chemical cleanings and membrane replacements in a shorter period than expected. Therefore, a retrofit of this system with the minimum CAPEX to realize a stable operation and minimize OPEX was highly anticipated. Replace the flat-sheet membrane module with the STERAPORE TM hollow-fiber membrane module to increase the membrane surface area per footprint to secure a sufficient influent treatment capacity without a tank and blower expansion Japan Atakadaiki Engineering Co., Ltd. Designed 420m 3 /d Domestic Sewage Through the membrane replacement, the system has gained more capacity under operation at an appropriate water flux rate accompanied by the following cost saving: CAPEX: No membrane tank and blower capacity expansion OPEX: Less membrane maintenance and replacement Year Operation Started 2011 Reuse Activated Carbon

5 Industrial wastewater treatment plant in Korea 05 Reduce or eliminate sludge carry-over to the final effluent dealing with significant fluctuations in the inlet water composition. Retrofit the existing conventional activated sludge process with Membrane Bioreactor () featuring the Mitsubishi Rayon hollow fiber membrane. Realize hassle-free STP operation and maintenance while getting the better quality final effluent especially in terms of BOD and SS. Korea CJ Korea Express Co. 1,000m 3 /day Industrial Wastewater (Dairy Plant) Water analysis DAF treated water treated water ph BOD 5 COD Mn SS T-N T-P n-h , <2 <10 <1 <5 <1 < DAF (Dissolved Air Flotation) Screen Anaerobic tank Discharge to riverhead

6 Wuxi Xincheng wastewater treatment plant 06 On June 5, 2008, the newly revised Taihu Lake Water Pollution Prevention Regulation was brought into effect. However, the footprint of this facility was too small to comply with the stringent regulation by increasing of the existing conventional activated sludge process capability without overloading. Apply membrane bioreactor () to meet the effluent standard with the limited land. Compliance with the standard with no overload concern and less manual operation. Water analysis Jiangsu Province, China Jiangsu Origin Water Technology Co., Ltd. 30,000m 3 /day Sewage (30% of Domestic Wastewater and 70% of Industrial Wastewater) 2011 COD Cr SS T-P NH3-N T-N and water quality Screen Anaerobic tank Denitrification tank Aeration tank Treated water 33.2 < Treated water

7 Petrochemical plant wastewater recycling 07 Reuse purified terephthalic acid (PTA) plant wastewater as cooling tower makeup to reduce the environmental load associated with effluent disposal and to cut the water bill Install all the membrane modules in the existing 10 meter depth tank without a shutdown of the WWTP Retrofit of the existing WWTP with an -RO system to obtain reusable water for the purpose Use of the existing beam to hang membrane modules to eliminate the guide pipe foundation work which requires a WWTP shutdown Ningbo, China Mitsubishi Chemical Engineering Co. 6,000m 3 /day Reuse up to 70% of the wastewater (4,200m 3 /day) as cooling tower makeup No WWTP downtime Petrochemical Plant Wastewater Reuse 2012 RO (Recovery Ratio: Approx.70%)

8 Industrial WWTP upgrade in Japan 08 Increase the processing capacity of the existing WWTP by 68.5% without footprint expansion Installation of an system through the use of one of the existing aeration tanks to boost the WWTP capacity with no overload, additional settling tank The target was successfully achieved having an extra 25% capacity for future expansion Hiroshima, Japan Nippon Rensui Co. 2,000m 3 /day Industrial Wastewater 2013 Screen Aeration tank Treated water

9 Electronics industry wastewater treatment plant in Vietnam 09 This facility is located in a industrial park, Vietnam. Need to construct the integrated wastewater treatment facility in the industrial park due to lack of capacity. Treated water directly discharge to the river. The criteria is BOD 24, COD 41. A treated water high quality is a critical factor for this project. Membrane Bio Reactor () can adhere the strict effluent standards of this river. The treated water by directly discharge into the river for protecting the environment. Vietnam Goshu Kohsan Co., Ltd. 500m 3 /day Electronics Industry Wastewater 2012 Screen Fenton tank Aeration tank Treated water

10 High COD effluent treatment at a chemical plant 10 Japan Swing Corporation Maximum 700m 3 /day Chemical Wastewater 2012 The raw wastewater is mixed effluent from chemical and pharmaceutical plants. The wastewater treatment facility cannot stop because the plant is running all year. The existing settling tank agitator has damaged by aging facility. Without stopping the existing facilities, adding a membrane tank, remodifications were carried out. Membrane Bio-Reactor () was been equipped. does not require settling tank and it also raised load. The water quality of the process is very good and stable. Our client said that wastewater treatment by is the best choice. Water analysis Flow m 3 /h COD T-N ph SS Raw wastewater Diluted water Aeration tank 1&2 Raw wastewater ,000 1,000 15, , Diluted wastewater 16 2, Settling tank treated water Treated water tank Treated water Dried sludge Sludge tank Coagulation tank Dehydrator