Chemistries                 0800 50 55 66

Industry - Wastewater


Wastewater industry is the only process in the world where you are unable to control your sources, but have to generate a perfectly controlled output. At Hach, we understand that energy and chemical costs are rising while regulations are getting tighter. We gladly embrace this challenge and agree that wastewater monitoring for process control is important. We strongly believe that only when you measure it, then you are able control it.

Make improvements with continuous process analysis

The supply to a wastewater treatment plant is affected by a number of factors: time of day, rain and dry weather, as well as industrial discharges, can all result in varying loads. To make sure that the plant can be operated in an energy efficient manner, the level of aeration must be adjusted to reflect the actual load on an ongoing basis. The use of additives must be adjusted constantly to guarantee optimum results, by using the correct precipitant quantity to allow chemical elimination of phosphates.

We offer a range of different analyzers, probes and control and regulation components to make sure that aeration and the metering of precipitants and flocculants is cost effective.



We provide our expertise in

  • Nitrogen Removal
  • Phosphorus Removal
  • Aeration Control
  • Dissolved Air Flotation (DAF) Optimization
  • Optimizing your chemical and energy use and saving you money
  • Minimize and avoiding process upsets


Wastewater treatment process and monitoring solution we are offering


Dissolved Oxygen  

If you are interested in lowering energy and maintenance costs, we have products with innovative luminescent technology to monitor dissolved oxygen and optimize your aeration control.

Activated sludge is one of the most widely used wastewater treatment processes available today, and dissolved oxygen is a key parameter for ensuring that the microorganisms vital to a successful process remain viable. Oxygen is introduced into wastewater along with microorganisms to develop a biological floc, which reduces the organic content of the wastewater. The Hach LDO probe applies luminescent technology to continuously monitor dissolved oxygen. The instrument controller can alert staff immediately of any changes in dissolved oxygen levels, and can be integrated with a variable frequency drive or PLC system to control the amount of oxygen injected into the system.

Did you know that roughly 70% of the energy costs in your wastewater plant are consumed powering blowers to aerate the wastewater? Many plants aerate 24/7 maintaining a higher dissolved oxygen level than necessary amounting to wasted energy and higher energy costs. With the Hach LDO solution you can save up to $100,000 on your energy costs and see the return on investment in the same year.

Total Organic Carbon  

Would having the ability to divert waste streams and adjust treatment processes in real time help you to avoid process upsets? With online instrumentation from Hach you can monitor a host of parameters that will allow you to detect process upsets and react before they cost you thousands of dollars in lost product, destroyed microbiology, or fines.

Total Suspended Solids  

Does your facility dose chemical based on flow rate? This can lead to wasted chemicals, increased hauling costs, and potentially fines! Our suspended solids sensors can help you dose based on solids concentration, optimizing your chemical use and saving you money.

In industrial processing plants, a DAF is often used to reduce loadings and clarify wastewater. Tiny air bubbles are released into the tank causing small particulates to float to the top where they are skimmed off. To remove larger suspended solids, coagulant is dosed into the feed water—this helps to speed up clumping and settling.

Typically, chemical is dosed to the DAF based on flow rate, but dosing based on flow ignores one major factor-the solids concentration! This leads to under and overdosing which could waste chemicals, increase hauling costs, and result in fines.

With Hach suspended solids probes, you can overcome this challenge by monitoring solids concentration in real-time and adjusting chemical feed based on the needs of the system.

Let our experts contact you!