Wastewater & Effluent Chemical Treatment

pH adjustment

pH adjustment may be required for a number of reasons:

To directly precipitate out chemicals otherwise present as more soluble salts
To increase the efficacy of any coagulants used
To enable discharge limits to be met
To maximise the concentration of the most efficient chlorine containing species for disinfection (e.g. hypochlorous acid vs hypochlorite)

The most commonly used chemicals for pH adjustment in effluent plants are lime, sodium hydroxide and sodium bicarbonate.

Coagulants

Many of the solid particles in water are as suspended solids (a colloid). They are very small electrically charged particles which repel each other and will not settle out of suspension by gravity alone in a reasonable timeframe; hence the need for chemical treatment. This typically results in the removal of 80-90% of suspended solids by chemical precipitation.

Coagulants act by neutralising the charge which enables the particles to come together forming slightly larger particles or microflocs.

Traditional coagulants were inorganic compounds, and can have advantages over the inorganic coagulants in that the produced sludge volume is often less, sludge disposal costs can be lower and they are less pH dependent.

Flocculants

The addition of flocculants brings the microflocs into contact resulting in their bonding and formation of flocs which are large enough for them to be separated out from the waste water. The flocculants are organic polymers (generally polyacrylamide) with varying charge densities and molecular weights. They act by forming a “bridge” between the microflocs. Mixing which should be gentle is critical to the performance of the flocculant and is generally done by mechanical or air agitation; overmixing can lead to the breakdown of the flocs.

HydroChemie can supply flocculants in different forms including powders and emulsions in a variety of different molecular weights and charge densities.

Antifoams

Antifoam agents are often used in both sewage treatment plants as well as in other industrial waste water treatment applications. HydroChemie have a variety of antifoam formulations, both organic and inorganic. A small selection is shown below.

Odour Control

Odours are not infrequently generated in effluent plants and may be particularly associated with the sludge which contains higher concentrations of odorous chemicals. HydroChemie have a number of products which are able to neutralise many odours such as those associated with hydrogen sulphide, ethylamines, butylamines, mercaptans, fatty acids and ammonia.

Disinfectants

HydroChemie have a number of oxidising biocide products which can be used in disinfection applications.

Wastewater & Effluent Chemical Treatment

pH adjustment

pH adjustment may be required for a number of reasons:

To directly precipitate out chemicals otherwise present as more soluble salts
To increase the efficacy of any coagulants used
To enable discharge limits to be met
To maximise the concentration of the most efficient chlorine containing species for disinfection (e.g. hypochlorous acid vs hypochlorite)

The most commonly used chemicals for pH adjustment in effluent plants are lime, sodium hydroxide and sodium bicarbonate.

Coagulants

Coagulants act by neutralising the charge which enables the particles to come together forming slightly larger particles or microflocs.

Traditional coagulants were inorganic compounds, and can have advantages over the inorganic coagulants in that the produced sludge volume is often less, sludge disposal costs can be lower and they are less pH dependent.

Flocculants

HydroChemie can supply flocculants in different forms including powders and emulsions in a variety of different molecular weights and charge densities.

Antifoams

Antifoam agents are often used in both sewage treatment plants as well as in other industrial waste water treatment applications. HydroChemie have a variety of antifoam formulations, both organic and inorganic. A small selection is shown below.

Odour Control

Disinfectants

HydroChemie have a number of oxidising biocide products which can be used in disinfection applications.

Range

Wastewater & Effluent Chemical Treatment

Wastewater & Effluent Chemical Treatment

pH adjustment

pH adjustment may be required for a number of reasons:

To directly precipitate out chemicals otherwise present as more soluble saltsTo increase the efficacy of any coagulants usedTo enable discharge limits to be metTo maximise the concentration of the most efficient chlorine containing species for disinfection (e.g. hypochlorous acid vs hypochlorite)

The most commonly used chemicals for pH adjustment in effluent plants are lime, sodium hydroxide and sodium bicarbonate.

Coagulants

Coagulants act by neutralising the charge which enables the particles to come together forming slightly larger particles or microflocs.

Traditional coagulants were inorganic compounds, and can have advantages over the inorganic coagulants in that the produced sludge volume is often less, sludge disposal costs can be lower and they are less pH dependent.

Flocculants

HydroChemie can supply flocculants in different forms including powders and emulsions in a variety of different molecular weights and charge densities.

Antifoams

Antifoam agents are often used in both sewage treatment plants as well as in other industrial waste water treatment applications. HydroChemie have a variety of antifoam formulations, both organic and inorganic. A small selection is shown below.

Odour Control

Disinfectants

HydroChemie have a number of oxidising biocide products which can be used in disinfection applications.

Range