Industrial wastewater has high concentration of organic matter which accounts for the highest part of biological effluents. To get rid of the biodegradable effluents present in wastewater, Biological Effluent Treatment Plant is the best choice one can opt for. The process of biological treatment of wastewater largely depends on some particular microorganisms that are capable of degrading the organic matter present.

The microorganisms grow with the help of the organic substances in the wastewater along with some nutrients that are harmful otherwise, like, Nitrogen and Phosphorous. Once all of the nutrients and organic matter is consumed, the microbes can then just be removed easily. This is a simple and cost-effective means of purifying water by removing both particulate and soluble matter.

There are several benefits of using biological effluent treatment plants:

  • It is the most economical technique of treating wastewater
  • Can be applied to a variety of wastewaters
  • Simple to operate
  • Does not require a lot of space and complex equipment
  • In anaerobic treatment, sludge production is minimized. Also, biogas is generated which can be used for other purposes.

Biological Oxygen Demand (BOD) is used to measure the organic contaminants that the microorganisms can decompose. BOD can be defined as the amount of dissolved oxygen needed by aerobic microorganisms to break down organic matter into smaller molecules. High levels of BOD indicates, high concentration of biodegradable matter present in the wastewater. This can be due to increased pollution due to industrial discharges, domestic fecal wastes, etc.

SPAN Hydrotech Pvt Ltd. offers a variety of biological effluent treatment solutions that can work across diverse industry sectors. Our team of expert engineers design, manufacture, and assemble different types of biological effluent treatment plants as per clients requirements. Here’s why you must opt for SPAN Hydrotech Pvt Ltd.

  • High customizable and cost effective solutions for biological effluent treatments
  • Our plants are compact in size, hence can be installed faster

Following are the two types of biological treatments to purify industry wastewater

  1. Aerobic System

In this process, microorganisms tend to degrade the effluents in presence of oxygen. This process is known as aerobic wastewater treatment or biological oxidation wastewater treatment. Oxygen gives all the necessary energy for the microbes to grow. Growth in the presence of oxygen enables the production of sludge. Here are the types of aerobic biological treatments for wastewater:

  • Conventional Process – Biomass grows freely in presence of oxygen inside the reactor and forms flocs.
  • Sequential Reactors (SBR) – It is a batch operation that is carried out according to a pre-planned schedule. Industries that produce less effluents can be benefited.
  • Biomembrane Reactors (MBR) – An ultrafiltration membrane is present in the reactor, which separates sludge from the liquid. Apart from this, the process is similar to the conventional process. Plants with less space can make use of the membranes.
  • Biodiscs – In this process the biomass is immobilized. The bacterial biomass starts accumulating on the discs and uses the organic effluents from the wastewater for metabolism.
  • Trickling Filters – The wastewater is treated across filters filled with support of sand or gravel. As the water moves along the filter, the organic matter starts to degrade by the biomass present in the filters.
  • Oxidation Pond – In this pond, there is an interaction between algae, bacteria, and other organisms which degrade the organic material present in the wastewater. This is a slow process and requires a lot of space.
  1. Anaerobic System

In this process, the organic effluents are treated in the absence of oxygen. Due to absence of oxygen, the sludge formation is also reduced. The biogas production is also lowered. In addition, nutrients like Nitrogen and Phosphorous present in the wastewater cannot be removed with the help of anaerobic process. It is a slow process which includes various steps. This process is used only for sludge degradation. Post the treatment, wastewater undergoes through several other processes to ensure that the water is in reusable state. The process converts about 40% – 60% of organic effluents to Methane and Carbon Dioxide.

  1. Anoxic System

In this process, microorganisms use other elements than Oxygen to degrade the organic matter present in the wastewater. These elements can be sulfate, nitrate, nitrite, selenite, and selenate.