How Process Water Treatment Works Step by Step

Process water treatment takes out harmful things from water. This makes the water safe for factories and businesses to use. Some common bad things in water are pesticides, industrial chemicals, metals, nutrients, and pathogens. The water treatment process has steps like coagulation, flocculation, sedimentation, filtration, and disinfection. These steps help remove solids and dangerous particles. Hella Water uses advanced and earth-friendly water treatment technologies. This helps make sure the water is very clean. Each step in the treatment is important for health and safe water use.

Process Water Treatment Steps

Collection

Process water treatment starts by gathering water from many places. Factories and businesses get water from rivers, lakes, groundwater, or city supplies. In the United States, most industrial water comes from surface water. Collected water is used for cooling, cleaning, and chemical reactions. The water’s quality changes based on the industry. The food and beverage industry needs very clean water. Other industries can use water with more impurities. Each plant designs its system for the industry it serves. This step is important because good collection protects equipment. It also helps the treatment process begin with the best water.

Screening

After collection, water goes to screening. Screening takes out big debris and floating objects. These things could hurt equipment in water treatment plants. Bar screens, drum screens, and traveling band screens are used. These screens catch sticks, rags, plastics, and sand. Removing these things keeps pumps and pipes safe. It also helps the rest of the treatment work better.

Screen Type	Opening Size	Typical Debris/Contaminants Removed
Coarse Screens	Larger than 6 mm	Large objects such as sticks, rags, plastics
Medium Screens	1.5 mm to 6 mm	Smaller debris
Fine Screens	Smaller than 1.5 mm	Fine particles like sand and silt

Screening is the first step to stop water contaminants. It keeps the plant running well and stops expensive repairs. Hella Water uses advanced screens to make plants work better and last longer.

Coagulation

Coagulation comes next in water treatment. This step uses chemicals called coagulants. Coagulants help tiny particles in water stick together. These particles have negative charges that keep them apart. Coagulants remove these charges. This lets the particles form small clumps called micro-flocs. Common coagulants are aluminum sulfate, ferric chloride, and plant-based biopolymers. The coagulant chosen depends on the water and what is in it.

Coagulant Type	Examples	Effectiveness and Characteristics
Inorganic	Aluminum sulfate (alum), ferric chloride, ferric sulfate	Neutralize negative charges; remove suspended solids and organic matter
Organic	Polyelectrolytes (cationic, anionic, non-ionic polymers)	Enhance floc formation and settling
Metal coagulants	Iron and aluminum salts	Remove phosphorus and heavy metals
Biopolymer	Plant or marine-based natural polymers	Biodegradable; less sludge; suitable for reuse and sensitive environments
Synthetic	Polyacrylamides, polyamines	Effective in complex water treatment; some environmental concerns

Coagulation works best with the right amount and mixing. For example, organic coagulants are used from 2 to 50 grams per cubic meter. The amount depends on the water and use. The process mixes fast to spread the coagulant. Then it mixes slowly to help micro-flocs grow. This step makes water clearer and helps the next steps work better.

Hella Water uses advanced coagulation to treat many contaminants. These systems help industries meet strict water rules. They also help keep operations safe and efficient.

Flocculation

Flocculation comes after coagulation in water treatment. In this step, plants add flocculants, which are special polymers. Flocculants help small micro-flocs join into bigger clumps called macro-flocs. Bigger flocs settle faster and are easier to remove.

1. Coagulants take away charges on particles.

2. Flocculants stick these particles into bigger flocs.

3. Bigger flocs settle fast, making clarification easier.

4. Faster settling helps manage sludge better.

5. Flocculation also lowers the cost to get rid of sludge.

The best flocculants are synthetic types like polyacrylamide and natural ones like chitosan. The choice and amount depend on pH, temperature, and particle type. Hella Water uses both old and new flocculation methods. These help make water clearer and support water reuse.

Note: Flocculation is a key step for clarification in water treatment plants. It helps remove suspended solids and improves the quality of treated water for industrial and commercial use.

Each step in process water treatment removes solids and protects equipment. It also makes sure water meets the needs of each industry. Hella Water’s systems use these steps with technologies like reverse osmosis and nanofiltration. This gives clean, safe water for every use.

Sedimentation and Filtration

Sedimentation

Sedimentation is an important step in water treatment. Water sits in big tanks so heavy stuff can sink to the bottom. These tanks can be rectangular or circular. Primary sedimentation tanks take out solids before other steps. Secondary tanks remove more particles after biological treatment. Clarifiers have arms that collect the solids that settle.

Type of Sedimentation Tank	Description	Examples / Shapes
Primary Sedimentation Tanks	First stage tanks removing raw sewage solids before biological treatment.	Rectangular (horizontal flow), Circular (center feed, radial flow)
Secondary Sedimentation Tanks	Used after biological treatment to remove suspended solids and biological floc.	Similar designs to primary tanks
Clarifiers	Tanks with mechanical devices for continuous solids removal, used in primary and secondary stages.	Horizontal flow, Solid contact clarifiers, Tube settlers, Plate clarifiers

Sedimentation takes out a lot of total suspended solids (TSS). Wet ponds can remove about 65% of TSS. Dry ponds remove about 53%. The removal rate can be from 30% to 80%. This depends on the tank and system. This step helps protect equipment and makes the next steps work better.

Filtration

Filtration happens after sedimentation. This step removes smaller particles that did not settle. Water treatment uses different filter media to catch fine particles. Common filter materials are silica sand, anthracite coal, and garnet. These materials are put in layers in multimedia filters. The top layer catches big particles. The bottom layer traps the small ones.

Filter Media	Key Applications	Features Relevant to Fine Particle Removal
Silica Sand	Pressure sand filters, RO pre-treatment	Effective for suspended solids and turbidity removal
Garnet	Bottom layer in multimedia filters	High density, retains fine particles (5–10 microns)
Anthracite Coal	Multimedia filters, municipal water	Low density, traps larger particles, supports deep-bed filtration
Activated Carbon	Organic matter and odor removal	Adsorbs organic compounds, improves water quality
Zeolite	Ammonia and nitrogen removal	Micro-porous surface, ion exchange capabilities
Walnut Shell	Oil and grease removal	Durable, reusable, effective for hydrocarbons

Bag and cartridge filters also help remove fine particles. They are made from things like polypropylene and glass fiber. Filters are rated by micron size. Nominal filters block about 85% of particles at their size. Absolute filters block up to 99.99%. Cleaning and changing filters often keeps the system working well.

Advanced Filtration

Advanced filtration uses special membranes to take out even smaller things. Ultrafiltration (UF) removes solids, bacteria, and some viruses. Nanofiltration (NF) has smaller pores and removes hardness ions, organic molecules, and more viruses. NF can remove up to 99% of some contaminants like PFAS. Reverse osmosis (RO) uses the smallest pores to remove salts and almost all dissolved things.

Feature	Ultrafiltration (UF)	Nanofiltration (NF)
Pore Size	Larger pores (1-100 nm)	Smaller pores (1-10 nm)
Contaminants Removed	Suspended solids, bacteria, viruses, colloids	Divalent ions, some monovalent ions, organic molecules, color, bacteria, viruses
Operating Pressure	Lower pressure	Moderate pressure
Typical Applications	Pre-treatment, removal of larger particles	Water softening, removal of hardness ions, partial desalination

Hella Water uses these advanced systems to meet strict water rules. These systems help industries and communities get clean water. Advanced filtration removes tough contaminants and helps keep people healthy.

Disinfection in Water Treatment

Disinfection Methods

Disinfection is an important part of water treatment. This step kills or stops harmful germs in water. Water treatment plants use different ways to disinfect water. The main ways are chlorination, ultraviolet (UV) disinfection, and ozonation. Each way works differently and has its own good points.

Disinfection Method	Advantages	Limitations
Chlorination	Works well against many pathogens; easy to get; not too costly	Can make byproducts; needs careful chemical handling
UV Disinfection	No chemicals; works on many germs; low running costs	Needs regular care and lamp changes; may not work on all germs
Ozonation	Very strong disinfectant; works on many germs; makes water taste and smell better	Needs special machines; can cost a lot to set up and run

Chlorination puts a disinfectant into the water. It works well against bacteria, viruses, and parasites. UV disinfection uses light to hurt the DNA of germs. Ozonation uses ozone gas to kill germs in water. All these ways help stop diseases that spread through water and keep people healthy.

Ensuring Water Safety

Water treatment plants must follow strict safety rules. These rules make sure water does not have dangerous germs. The Environmental Protection Agency (EPA) makes rules for safe water. The table below lists some important rules:

Microbial Contaminant	Regulatory Limit / Treatment Technique	Health Impact	Notes
Cryptosporidium	Special treatment needed; zero allowed	Causes stomach problems like diarrhea and cramps	Must be removed or killed; unfiltered systems need extra controls
Giardia lamblia	Special treatment needed; zero allowed	Causes stomach illness	99.9% must be removed or killed
Viruses	Special treatment needed	Causes stomach illness	99.99% must be removed or killed
Legionella	Special treatment needed (no set number)	Causes Legionnaire’s Disease (a type of pneumonia)	EPA says controlling Giardia and viruses also controls Legionella
Turbidity	Must be ≤1 NTU always for some filters; ≤0.3 NTU in most samples each month	Shows how clear water is and if treatment works	Other filters must meet state rules (≤5 NTU)
Heterotrophic Plate Count (HPC)	Special treatment needed; no more than 500 colonies/mL	No direct health risk; shows how many types of bacteria are present	Lower HPC means better care of the system
Total Coliform	No more than 5% positive samples each month	Shows possible fecal contamination	Positive tests need more checks for E. coli or fecal coliforms

Water treatment plants often use extra rules to make water safer.

• NSF/ANSI 55 checks if UV systems kill bacteria, viruses, and cysts.

• NSF P231 checks water purifiers using EPA rules.

• NSF/ANSI 244 checks filters for cutting bacteria, viruses, and cysts during short-term problems.

• Other rules, like NSF/ANSI 42, 53, 58, and 62, help keep water safe with filters and treatment.

These rules and checks help water plants give safe water. They protect people from diseases in water and keep water quality high.

Water Treatment Process for Final Use

Distribution

Treated water leaves the plant ready to use. First, it goes into big tanks or reservoirs. These places keep the water clean until people need it. Pumping stations move water through strong pipes. The pipes are made from ductile iron, PVC, or steel. Water travels to factories, businesses, and other users. Valves help control how much water moves. Meters measure how much water each user gets. Sensors check the water’s pressure and quality as it moves.

Many industries use water for cooling, cleaning, or making things. Power plants use treated water to cool their machines. Food plants need clean water for washing and cooking. Some companies reuse water at their site. Others get potable water from the city. Public and private groups work together to give recycled water to big users. These users include power stations and refineries. The water treatment system matches water quality to each use. This way, water is not cleaned more than needed. It helps save money and energy.

Tip: Corrosion control and backflow prevention stop bad metals and contaminants from getting in the water. These steps keep the water and people safe.

Quality Assurance

Water treatment plants must follow strict rules for quality. Groups like the EPA, American Water Works Association, and World Health Organization make these rules. Hella Water follows these rules to keep water safe. Workers test water for pH, turbidity, and contaminants. Both people and machines check water quality all the time.

Parameter	Description
COD	Shows how much oxygen is needed to break down organic matter.
BOD	Measures oxygen used by microbes to break down organics.
TSS	Counts suspended solids that can cloud water.
pH	Checks if water is acidic or basic.
Ammonia Nitrogen	Monitors toxic nitrogen that can harm aquatic life.
Total Phosphorus	Tracks nutrients that can cause algae growth.
Total Nitrogen	Measures all forms of nitrogen pollution.

Certification programs like NSF/ANSI/CAN 60, 61, and 372 check chemicals and pipes for safety. These programs make sure nothing harmful gets into drinking water. Hella Water uses advanced technologies like membrane filtration and chemical oxidation. These help remove tough contaminants. The company’s systems help industries meet all water quality and safety rules. This makes sure every user gets clean water that is safe to use.

Wastewater Treatment and Reuse

Wastewater Treatment Steps

Treating wastewater is needed for factories and cities. It keeps the environment safe and helps people stay healthy. Treating wastewater also saves water for later use. The process takes out harmful things before water goes back to rivers or gets reused.

The main steps in industrial wastewater treatment are:

1. Preliminary Treatment: Workers use screens and grit chambers to take out big solids, grit, oils, and grease.

2. Primary Treatment: Tanks let solids settle or float so workers can remove them.

3. Secondary Treatment: Microorganisms break down organic matter in the water. Activated sludge and trickling filters help with this step.

4. Tertiary Treatment: Advanced filtration, nutrient removal, and disinfection take out small pollutants and germs.

5. Final Disinfection: Chlorine, UV light, or ozone is used to kill any leftover pathogens.

Note: Each step makes wastewater cleaner and safer for reuse or for putting back into nature.

Water Reuse

Reusing treated wastewater gives factories water even during dry times. This means they do not need to take as much fresh water from rivers and lakes. It also helps protect nature and supports local people.

Many factories use advanced technology to reuse water. These include:

• Membrane filtration methods like ultrafiltration, nanofiltration, and reverse osmosis to take out solids and dissolved impurities.

• Advanced oxidation processes to break down hard chemicals and kill germs.

• Disinfection systems using UV, ozone, or chlorine to make sure water is safe.

Hella Water gives these solutions to help companies follow strict water quality rules. Their systems help save water and protect the environment. Reusing wastewater can also save money and help local businesses. Projects that recycle water often help the economy and keep water available for everyone.

Tip: Using treated wastewater helps factories save money, follow rules, and protect the planet.

Process water treatment uses important steps to keep water clean and help the planet:

• Preliminary treatment takes out big pieces and trash.

• Primary treatment gets rid of floating solids and grease.

• Secondary treatment lets tiny living things eat organic waste.

• Tertiary treatment takes away nutrients and germs for safe reuse or release.

• Advanced tools like reverse osmosis and smart systems make the process better and save resources.

Hella Water gives strong solutions that help factories follow tough rules and care for nature. Good water treatment keeps people healthy and helps our world stay safe for the future. 🌎