Effective Solutions for Every Project
Chemical Treatment
Coagulation and flocculation are essential water treatment processes used to remove fine suspended solids from dirty water. They are commonly used in sediment control systems on construction sites and in water clarification systems. These processes work together to bind fine particles so they can be more easily separated from water. When applied correctly, they significantly improve water clarity and reduce sediment discharge.
ADVANCED WATER TREATMENT
Coagulate. Flocculate. Separate.
Title
The treatment process begins when a coagulant is introduced to the water, followed by a flocculant to strengthen particle aggregation. As the reaction develops, visible changes occur as fine suspended particles begin to cluster and form larger flocs. These flocs grow in size and weight, making them easier to remove through settling or mechanical separation. The efficiency of this process depends on correct dosing, mixing energy, and contact time within the treatment system..
How it works
System Design and CTMP
Soil testing is typically required to determine the correct coagulant type and dose rate for site-specific conditions. The results are used to develop a Chemical Treatment Management Plan (CTMP), which defines dosing rates, treatment methodology, and operational requirements to manage runoff and reduce sediment discharge.
Neutralisation of Charges (Coagulation)
PAC (Polyaluminium Chloride) contains positively charged aluminium ions. When added to water, these ions attract negatively charged soil and sediment particles. This neutralises the electrical charge that normally keeps particles suspended in the water.
Formation of Micro-Flocs (Coagulation Phase)
Once the charges are neutralised, the fine particles begin to collide and stick together, forming small clusters known as micro-flocs. This initial aggregation stage is called coagulation.
Flocculation (Floc Growth)
A flocculant (long-chain polymer) is then added to strengthen and grow the micro-flocs. Gentle mixing encourages the particles to bind together into larger, heavier flocs without breaking them apart.
Sedimentation and Removal
The larger flocs settle out of the water under gravity or are removed through filtration or mechanical separation. This process improves water clarity and reduces suspended solids significantly.
Why choose Erosion Control?
We believe we are your best choice for environmental contracting services in the North Island. We offer decades of experience, a range of effective solutions, and a track record of 100% compliance. Our “do it right the first time” philosophy means you get a reliable, professional team working with you.
Providing Creative Solutions
Time and again, we’ve witnessed this fact: Doing the right thing for the environment is the most cost-effective solution in the long run. Known for our consultative approach, we’ll team with project managers early in the planning stages to identify green solutions that meet your project and budget requirements.
Ensuring 100% Compliance
Throughout the design, installation, and maintenance phases, we bring an advanced level of expertise and regulatory knowledge to our clients’ projects. Starting with the planning process, our clients rely on our guidance and expertise throughout the entire construction process.
Offering best-management practices
We implement tried-and-true best-management practices, plus we’re on the forefront of the latest advances. Our clients appreciate that we take time to talk with them, educate them, and help them determine whether new approaches, procedures, or leading-edge technology may suit their site’s needs.
CONTACT US
VISIT AUCKLAND
171 Postman Road
Dairy Flat
Auckland 0794
VISIT HAMILTON
175E Ellis Street
Frankton
Hamilton 3204
HOURS
MON - FRI
7:00AM - 4:00PM
Phone
0800 787 2966
POSTAL
PO Box 130
Silverdale
Auckland