Question

What is purple sulphur bacteria?

Answer 1

They're easy to spot under a microscope since their shape is similar to that of "Chex-Mix" snacks. They extract hydrogen sulphide from the water column and convert it to elemental sulphur granules. Sulfuric acid can be produced by oxidising these sulphur granules.

Complete answer:
Purple bacteria are anoxygenic, meaning they do not create oxygen using water as an electron source. Sulfide, sulphur, thiosulfate, or hydrogen are used as electron donors by purple sulphur bacteria (PSB).

Purple sulphur bacteria (PSB) are a type of photosynthesis-capable Proteobacteria that are collectively known as purple bacteria. They live in stratified water habitats such as hot springs, stagnant water bodies, and microbial mats in intertidal zones, and are anaerobic or microaerophilic. Purple sulphur bacteria, unlike plants, algae, and cyanobacteria, do not use water as a reducing agent and so do not create oxygen. Instead, they can employ sulphur in the form of sulphide or thiosulfate as an electron donor in their photosynthetic pathways (some species can also use $H_2$, $Fe^{2+}$, or $NO_2$).
Sulfur is oxidised to create elemental sulphur granules. This can then be oxidised to produce sulfuric acid.

Purple sulphur bacteria are split into two families: Chromatiaceae and Ectothiorhodospiraceae, which produce internal and exterior sulphur granules, respectively, and have internal membrane structures that differ. They are members of the Chromatiales order, which belongs to the Proteobacteria's gamma subgroup. The genus Halothiobacillus is likewise classified as a member of the Chromatiales, although it is not photosynthetic.

Purple sulphur bacteria have been found to help reduce the release of environmentally hazardous organic compounds and odours in manure wastewater lagoons. In wastewater lagoons, harmful substances such as methane, a greenhouse gas, and hydrogen sulphide, a stinky, poisonous molecule, can be discovered. PSB can help lower both of these concentrations, as well as others.

Photoassimilation, or the intake of carbon by organisms through photosynthesis, can eliminate harmful organic molecules. PSB in the lagoons can use carbon from hazardous substances like methane as a carbon source when they undergo photosynthesis. This decreases the impact of the lagoons on the atmosphere by removing methane, a greenhouse gas.

During the same photosynthetic processes that remove the organic molecules, $H_2S$ can act as a sulphur source for PSB. PSB's usage of $H_2S$ as a reducing agent eliminates it from the lagoon, resulting in a reduction in odour and toxicity.

Note:
Sulfur is required by your body to produce and repair DNA as well as to protect your cells from damage that can lead to major illnesses such as cancer. Sulfur also aids in the digestion of food and is beneficial to the health of your skin, tendons, and ligaments. Methionine and cysteine are two sulfur-containing amino acids.