Dissolved Air Flotation for removal oils and fats

on 08/07/2020 No comments

Aguambiente has recently finished supplying and installing a new physicochemical treatment system using dissolved air flotation to treat up to 240m3 per day at the wastewater treatment plant (WTP) at an oil recycling and biodiesel production company.

The physicochemical process using dissolved air flotation was positioned between the homogenisation-neutralisation and biological treatment processes.

Due to the nature of the company’s work, the effluent that reaches the homogenisation tank contains high levels of oil, which are difficult to remove. The proposed solution to the problem was to install a dissolved air flotation system in order to separate the oil and grease from the water.
The objective? To improve the quality of the water at the biological treatment outlet.

The dissolved air flotation unit is equipped with a flocculation tube, where the reaction between coagulants and flocculants takes place to enable the purification process.

When the dissolved air flotation process is preceded by coagulation-flocculation treatment, the performance in terms of separation of suspended solid matter is greatly improved, with up to 95% being easily removed; this entails a reduction in the DBO5 of at least 40%. This is due to the fact that the coagulation-flocculation process has been designed with a structure and size of floc that promotes the adhesion of dissolved air particles, with the result that separation by flotation is far greater and faster.
With a dissolved air flotation unit, the finest solid particles are eliminated along with any floating phases that may be present in the water (oil, grease, etc.).
Here you can see other references in water treatment with high oil content.

aGb-adminDissolved Air Flotation for removal oils and fats

Dissolved air flotation technology to boost the functioning of the settling tanks

on 18/06/2020 No comments

Aguambiente is currently renovating the wastewater treatment plant (WWTP) at an industrial bakery. The renovation will be carried out in two phases.

The aim of the first phase is to boost the functioning of the settling tanks from the biological treatment outlet using a parallel dissolved air flotation system. The device installed is an Anaconda® dissolved air flotation unit providing treatment at a rate of 20m3/h.

An automated polyelectrolyte dosing system has also been supplied. The device features three chambers: one for mixing, one for maturation and another for collecting the mature polyelectrolyte at the optimal time for use.

In the second phase, the homogenisation and biological treatment systems will be extended. Two W-Tank® tanks will also be installed.

aGb-adminDissolved air flotation technology to boost the functioning of the settling tanks

What does a preliminary analysis of wastewater discharge involve?

on 25/05/2020 No comments

In order to assess the issues presented by each discharge, we must understand its composition via sampling. This involves analysing the most representative parameters and performing tests such as the Jar test to ascertain process performance, allowing us to select the best treatment for each specific case.

Preliminary analysis of wastewater discharge allows the pollutant load discharged by a company to be analysed and the treatment best suited to each company to be identified.

To ensure a correct analysis of wastewater discharge, an automatic sampling device must be used to allow samples to be taken on a regular basis 24 hours a day. It is also important to establish whether there are any specific times when the factory discharges more wastewater than usual, leading to a temporary increase in load and flow.

Once the data has been collected, the samples are sent to the laboratory. Tests are carried out on all parameters (QDO, QBO5, MSS, NT, P, K, heavy metals, pH, conductivity, temperature, etc.) considered necessary to inform the design of the purification system.

aGb-adminWhat does a preliminary analysis of wastewater discharge involve?

World Water Day 2020: Water and climate change

on 11/03/2020 No comments

Since 1993, World Water Day has been celebrated every year on 22 March. World Water Day 2020 focuses on water and climate change, and on the close link between the two issues. The campaign shows that, depending on our use of water, we can reduce floods and droughts, combat the scarcity of that resource and its pollution, and at the same time help combat climate change itself.

This campaign contains three key messages:

We can’t afford to wait. Water should be a priority in climate action plans.

Water, a resource against climate change. Sustainable, affordable and adaptable solutions in water and sanitation.

We can all be an active part. In our daily lives, various surprisingly simple actions allow us to fight climate change.

It is incredible how many water-related actions anyone can implement anywhere to fight climate change. Some changes of habits that we can all put into practice today:

Take five-minute showers

More plant-based meals

Do not throw away food in good condition

Turning off electronic devices

Buy sustainably.

The aspiration to reach even the most vulnerable is becoming increasingly important, as environmental degradation, climate change, population growth and rapid urbanization, among other factors, intensify and pose considerable challenges for water safety.

However, water and sanitation can contribute significantly to the achievement of the comprehensive set of 2030 Agenda for Sustainable Development objectives, ranging from food and energy security to economic development to sustainability Environmental.

Climate change largely serves to give a necessary impetus to the implementation of obvious reforms in the water sector.

aGb-adminWorld Water Day 2020: Water and climate change

Aguambiente renews its ISO 9001: 2015 certification

on 30/01/2020 No comments

Recently, Aguambiente has renewed its ISO 9001: 2015 which certifies quality in management. The scope of the same refers to the design, WWTP installation, after-sales service of Wastewater Treatment Plants (WWTP).

The exploitation and maintenance services of the WWTP are also included.

For Aguambiente, it is a pride to continue renewing this certification, which is a new recognition of the process of continuous improvement that the company carries out and also recognizes the good work done by the Aguambiente Team: Project Engineers, Maintenance Technicians, Water Laboratory and Operators that manage the maintenance and operation of the treatment plants.

aGb-adminAguambiente renews its ISO 9001: 2015 certification

WWTP in dairy industry, problems by Meganema perideroedes

on 29/01/2020 No comments

The filamentous bacteria are generally present in the mocrobiological communities of activate sludege of wastewater treatment plants (WWTP) and insutria (WWTP). The excessive growth of these organizsms could cause seriou problems, foaming and bulking, for the operation of the WWTP. Specifically the IWWTP of dairy Industry are very problematic due the high level of soluble COD in the tributaries, In dayry serum IWWTP there was a problme of bluking, caused by the morphotype Nostocoida limícola, which subsequently was identified as Meganema perideroedes using the Fish technique. There was a positive relationship between the deficiency of osygen and the presence of this organism in the activate sludge. Read the full article here.

Source: Tecnoaqua

Technical Article bu Eva. Rodríguez, Asociación Científica Grupo Bioindicación de Sevilla, Spain; Estrella. de la Concepción, Aguambiente S.L y José Luis Alonso, Instituto de Ingeniería del Agua y Medio Ambiente. Universitat Politècnica de València, Spain.

aGb-adminWWTP in dairy industry, problems by Meganema perideroedes

Flocculation-Coagulation Operations:

on 27/09/2019 No comments

Wastewater contains suspended material, solid particles that can settle on their own, but we can also find very small particles of a colloidal kind with a size between 0.001 and 1 µm. It is not possible to divide these particles by decantation or flotation. Neither we could filter them because they would pass through any filter.

Each of these colloids contains particles stabilised by a series of equivalent charges on their surface, causing two adjacent particles to repel as two magnetic poles repelling each other. This prevents them from agglomerating to settle.

Coagulation is caused by the removal of electrical layers surrounding colloidal particles with the formation of microscopic nuclei. Flocculation consists of an agglomeration of destabilised particles in microflocules first and later in agglomerates called floccules.

The physical-chemical treatment of wastewater – by adding coagulant and flocculant – is aimed to altering the physical condition of these colloid substances that could remain stable indefinitely to convert them into particles subject to flotation/decantacion by division.

In the video we see that for breaking the stability of colloid particles and separate them easily we carry out three phases: Coagulation, Flocculation and Floating/Decantation.

aGb-adminFlocculation-Coagulation Operations:

Aguambiente completes the execution of the filtering and sludge line for hydrocarbon waters plant in Malta.

on 15/07/2019 No comments

Aguambiente has completed the installation of a water and sludge treatment system in Malta for a hydrocarbon water plant from ships.

The project has been carried out with pre-assembled equipment in a container, so that it is easier to install and assemble it on site. This reduces the execution of civil works.

The installation has been arranged in three containers and consists of:

A first container for the filtering line includes:

– Sand filter for 10 m3 / h with water and air washing with blower.

– 2 ud active carbon filters of 2,400 liters capacity for a flow of 5-10 m3 / h. These may work in series or in parallel.

Another sludge dewatering line formed by two containers that include:

– Muddy tank with agitation 6,000-liters.

– Dosage of chemicals: Coagulant and emulsified flocculant.

– Automatic Polyelectrolite Preparation Plant.

– Pumping of sludge.

– Draco® FPA 80/20 Automatic Filter Press.

– Filtered water pumping tank 1,000 liters.


The containers that have been installed are equipped with:

– Connection between equipment

– Conditioning of walls and floors, sandwich panel

– Interior lighting and power take-off.

– Helical fan with ventilation grid.

– Air Conditioner.

– Security elements, fire extinguisher, first aid kit.

– Anti-slip floor made of silica sand with GRP.

– Internal drains.

– Access pedestrian door.

The project also includes a Defender® FSH5 hydrocarbon separator, where the separation process is carried out in two phases: water phase and oil phase. The separation process is based on the effect of coalescence, increased by lamellar and stable flow conditions, by passing the effluent through the package of lamella coalescing pack.

aGb-adminAguambiente completes the execution of the filtering and sludge line for hydrocarbon waters plant in Malta.