The Covid-19 epidemic has affected the production and business activities of many factories and enterprises across the country. This has caused most wastewater treatment systems to temporarily stop or maintain operations without receiving wastewater. For systems that apply biotechnology to treat wastewater, the recovery process will take longer than usual because microorganisms need time to adapt to the concentration of wastewater that has just been fed into the system. To prevent this phenomenon, during the epidemic break, the unit should use molasses, methanol, aeration and submersion, etc. to maintain the supply of food and air for microorganisms.

System reactivation procedure

The system re-commissioning process will go through various testing stages, including:

Equipment testing:

Check the operating capacity of machinery and equipment

• Check the power supply capacity of the equipment

• Check the status of machinery and equipment in the tanks such as: submersible pumps, submersible mixers, stirring motors, air blowers, horizontal shaft pumps, etc.

• Conduct maintenance if the machinery malfunctions or does not work properly

Check the microbiological system:

• For systems that are forced to stop operating: in these cases, it is necessary to conduct a thorough, detailed and in-depth assessment of the current status by specialized technical staff.

• For systems that are still operating to maintain the microbiological system (aeration, submersible mixing): it is necessary to re-check the sludge density in the tank and refill the wastewater with increasing flow each day so that the microorganisms can both adapt and increase the sludge density.

Check the chemical system:

Check the chemical system

• With some chemicals, after a period of accumulation, they will clog the pipeline (for example: coagulant chemicals, caustic soda (NaOH), lime, etc.); it is necessary to check and clean the pipeline with clean water before operating the chemical system

• Check the operating efficiency and pump flow of the dosing pump

Some common microbiological problems and how to fix them:

• Shock loading phenomenon in activated sludge tank:

The sludge tank appears with a lot of dark foam, the wastewater after settling is cloudy. This phenomenon can be handled by reducing the inlet wastewater flow and balancing nutrients

Microbial shock phenomenon

• Sludge floating phenomenon in the settling tank:

Due to the sludge retention time being too long in the settling tank, causing anaerobic decomposition in the settling tank, the sludge floats to the surface. To handle this problem, it is possible to increase the circulation or dispose of the sludge

Floating sludge phenomenon in the settling tank

• Odor emitted from the system:

This is anaerobic decomposition in the equalization tank due to lack of air and poor mixing, creating areas lacking oxygen, causing pollutants to settle and decompose. This can be overcome by increasing mixing and aeration to provide enough oxygen

Odors coming from the system

• Sludge is light brown, forms thick foam, settles poorly and has a lot of suspended floc:

This phenomenon occurs due to low sludge age and high feed/microorganism ratio (F/M). It can be solved by reducing waste and increasing sludge circulation, operating at low F/M ratio

Young sludge phenomenon

• The sludge is dark brown or black, has dark foam and is viscous, and settles very quickly:

This phenomenon occurs due to the age of the sludge and low F/M ratio. It can be solved by increasing sludge disposal and supplementing food for microorganisms in the activated sludge tank

Old sludge phenomenon

Re-operation plays an important role, determining the normal and stable operation of the system. During the re-operation process, Nanoen regularly checks and monitors the system to promptly fix problems, ensuring effective production and business operations of partner units!

NANO Environment Technology – Construction Limited Liability Company provides free consulting services on operation for investors in need; at the same time, provides maintenance - maintenance and system operation packages; ensuring support for customers to confidently resume production and business operations effectively and stably after the recent Covid-19 pandemic!

Prestigious wastewater treatment system operation service provider

Nanoen is a unit operating in the environmental field. During its operation, Nanoen has received the trust of customers for its honesty, dedication and responsibility towards customers and the company's products.

With a team of experienced staff, we have a full range of services from environmental profile consulting to construction design, environmental treatment system operation, microbiological supply, sludge pressing for hire, etc.

Nanoen is always ready to bring the best service experience, suitable for the needs of our customers.

Nanoen

NANO ENVIRONMENT TECHNOLOGY - CONSTRUCTION LIMITED LIABILITY COMPANY

Address: 661E/29, đường Võ Văn Kiệt, KV Bình Yên A, P. Long Hòa, Q. Bình Thủy, TP. Cần Thơ

Hotline: 0941.777.519 - 0907.803.678 - 0901.229.798

Email: nanoentech@gmail.com

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