Industrial wastewater treatment
January 16, 2023
Industrial wastewater treatment is the process used to handle wastewater created as an undesired byproduct of industry. After treatment, the industrial wastewater (or effluent) might be recycled or dumped into the environment’s surface water or sanitary sewer. Some industrial facilities’ effluent can be treated at sewage treatment facilities.
Most industrial processes, including chemical and petrochemical plants, petroleum refineries, and chemical and petrochemical plants, have their own specialised facilities for treating their wastewater, so that pollutant concentrations meet the requirements for wastewater disposal into sewers, oceans, rivers and lakes..
This holds true for businesses that generate wastewater with high amounts of nutrients, hazardous contaminants, such as heavy metals and volatile organic compounds, or organic materials (like oil and grease) (e.g., ammonia). Before releasing the partially treated trash, some businesses utilise a pre-treatment system to remove some impurities (such as toxic compounds).
The step-by-step processes used in industrial wastewater treatment are as follows:
Step 1: Screening & pumping
In this first step, screening equipment filters out oil, plastics, wood chips, and other items from the incoming wastewater. Before being dumped in a landfill, the removed material is cleaned and compressed. The screened wastewater is then subjected to the grit removal stage.
Step 2: Grit removal
In this stage, sand, gravel, and other heavy but fine materials are removed from the effluent. A landfill is also used to dispose of this garbage.
Step 3: Chemical addition
In this stage, the wastewater is cleaned using biological or chemical processes with chemical additives. Then, as sewage deposits decompose and emit gases like hydrogen sulphide, chemical treatments are applied to oxidise the gases and lessen their bad odours.
Step 4: Coagulation & flocculation
To remove turbidity or murkiness from the water, chemicals are used to treat wastewater during the coagulation and flocculation process. This process allows water to be sterilised more quickly and helps enhance the water’s flavour and odour. To produce larger, denser particles known as floc, a coagulant is typically added to the wastewater to bind smaller particles together.
Step 5: Sedimentation & clarification
Gravity helps heavier particles (produced during the coagulation and flocculation stage) fall to the bottom of the sedimentation basin during the sedimentation process, where they may be removed more easily. Water moves slowly through, giving the floc time to settle and land at the bottom of the basin for simple removal. The clarified water can reach the filtration stage above it.
Step 6: Filtration
Any lingering particles or undesired organic materials from wastewater are removed during the filtration process. During this stage, the water is processed through a fine, sand-like substance or carbon granules. Only pure water can pass through because the carbon retains undesirable particles.
Step 7: Disinfection
UV disinfection is used to ensure the treated wastewater is almost bacteria-free after the filtration stage. Any remaining germs are eliminated during the UV treatment procedure, which puts us back in compliance with our discharge permit.
Step 8: Aeration
To raise the dissolved oxygen content to an acceptable level, the treated water may need to be aerated. The treated water is then released into the river through the effluent outfall.
Step 9: Analysis testing
After the aeration process, the treated water will be analysed to check its parameters whether they reached an acceptable level.
Step 10: Effluent disposal
To reduce volume and produce a usable end product, the waste-activated sludge from step 8 and the main sludge pushed from the bottom of the primary clarifiers must be treated.
Once the dissolved oxygen content in the treated water has reached an acceptable level, the effluent is ready for disposal.
The steps for treating industrial wastewater described above help clean wastewater from industrial use. You may efficiently use these processes to purify your water by learning the general principles of industrial water treatment. Get in touch with us here to learn more about industrial wastewater treatment.
Our service includes Industrial waste, Oily waste, Marine waste.
To provide a hassle free solution to our customer is always the key approach and to ensure a win-win situation towards. As a NEA approved environmental company in Singapore, we take all our services seriously and to ensure maximum safety with compliances applied. Every step of our disposal processes are also designed to meet NEA & SCDF requirements, with latest treatment facilities and laboratories to test and treat all incoming waste before disposal.
GTE operates a total land area of about 100,000sqft at 14 Tuas South Street 12 Singapore 636953. With our comprehensive logistics and transportation fleet, we provide prompt and efficient services in transportation of waste to our premises.