The black-odorous water phenomenon is a severe problem in aquatic systems affected. The term "black-odorous" is a sensory description of polluted water, referring to conditions where waterbodies turn black with a malodor, which affects the living conditions of local residents, the functioning of ecosystems and urban landscapes. During the last two decades, as the population rapidly rose and urbanized areas swiftly expanded, the frequencies and severities of black-odorous water phenomena intensified dramatically. This unpleasant phenomenon occurs worldwide in both developing and developed countries and seems to be a more common event in less developed areas. Therefore, it can be seen that the black-odorous water has become a problem to be faced all over the world, especially in less developed areas. Alfa Chemistry has been deeply engaged in environmental governance for many years and has rich experience and strong ability in water environmental governance. We believe that our professional knowledge will make great contribution to black-odorous water governance.
Causes Of Black-odorous Water
Generally speaking, the causes of black-odorous waterbodies mainly include the following three aspects.
- First, the poor fluidity of some water systems causes the waterbodies to be stagnant.
- Second, organic pollutants in water exceed the standard.
- Third, the lack of dissolved oxygen in the water leads to an anaerobic environment in the water.
Due to the above reasons, a large number of compounds leading to the blackening and odor formation in waterbodies are produced, and the main compounds are as follows [1].
- It has been widely reported that blackening of waterbodies occurs due to the presence of metal sulfides in overlaying water, such as ferrous sulfide (FeS) and manganese sulfide (MnS), which are formed by the combination of Fe2+ and Mn2+ with S2-. In addition, several studies have suggested that copper sulfide (CuS) and mercuric sulfide (HgS) are also key substances associated with water blackening.
- Volatile organic sulfur compounds (VOSCs) have been reported to be largely responsible for odor formation in waterbodies, such as methanethiol (MTL), dimethyl sulfide (DMS), dimethyl disulfide (DMDS) and dimethyl trisulfide (DMTS).
Our Service
Based on years of learning and experience, Alfa Chemistry can provide customized solutions for a wide range of black-odorous water treatments. Our black-odorous water treatment services cover the following areas.
Strategies for Black-odorous Water Treatment
Because of the complex issues associated with black-odorous water pollution, it is difficult to give a clear and unified governance solution. Therefore, according to the specific conditions of different waterbodies, a custom solution will begiven by Alfa Chemistry through combined various treatment technologies. However, the general strategy and technology of black-odorous water treatment in our company are as follows.
At present, the treatment technologies used for black-odorous waterbodies can be divided into four method categories of physical, chemical, biological and ecological remediation technologies. In the actual process, according to the specific project, it can be divided into the following three aspects.
- In-situ treatment technologies: In-situ treatments utilize physical, chemical or biological methods in-situ to reduce the required volume of contaminated sediment and reduce the content, solubility, toxicity or mobility of pollutants, while preventing the release of pollutants into the waterbody. Physical methods include artificial aeration and water cycling and chemical methods include enhanced flocculation, chemical oxidation and chemical precipitation. It should be noted that physical and chemical treatment methods do not function independently and are instead coupled with each other. Biological methods include biological absorption, transformation, removal or degradation of environmental pollutants, allowing the contaminated environment to be partially or completely restored to its original state.
- Ex-situ treatment technologies: The purpose of ex-situ technologies for water treatment, are to divert polluted water into nearby water treatment facilities for treatment and then return the purified water to the original waterbody. Ex-situ treatment technologies mainly include stabilization pond treatment technologies, constructed wetlands, ecological storage zones, ecological rapid infiltration and mobile integrated enhanced purification.
- Bio-ecological engineering remediation technologies: Bio-ecological engineering remediation technologies include coordination between natural and cultural landscapes, natural restoration of aquatic animals assisted by artificial regulation, recovery of benthos and plankton, recovery of aquatic plants dominated by submerged plants, remediation of river buffer zones and ecological slope protection.
Contact Us
Alfa Chemistry has been committed to solving environmental pollution problems through various means for many years, which can be targeted to solve different types of water pollution. Alfa Chemistry will take into account the pollution degree of waterbody and external environmental factors to choose reasonable treatment technology to fundamentally solve the problem of black-odorous waterbody. We will provide a comprehensive package of solutions, and operational and engineering recommendations. Please feel free to contact us if necessary.
Reference
- A critical review of the appearance of black-odorous waterbodies in China and treatment methods[J]. Journal of Hazardous Materials, 2020, 385: 121511.
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