Treatment of the pesticide industry effluent using hydrodynamic cavitation and its combination with process intensifying additives (H 2 O 2 and ozone) (original) (raw)

Degradation of insecticides using hydrodynamic cavitation

Waste containing harmful pesticides or insecticides is directly let in to the water bodies without any treatment causing hazardous effects on the aquatic as well as on humans. This makes it important to effectively treat the waste water before letting them in to the river body. Imidacloprid is an insecticide which affects the nervous system of insects leading to death. It is highly toxic, relatively high solubility and high stability in water it is difficult to remove using simple filtration process. Long exposure of Imidacloprid to mammals and aquatic life can cause degenerative changes in bone marrow and affect cardiovascular system. This work is on effective degradation of Imidacloprid in waste water using Hydrodynamic cavitation. Cavitation is phenomena of generation and collapse of cavities or bubbles releasing high amount of energy with generation of highly reactive free radicals. Hydrodynamic cavitation is obtain by pressure variation obtain by change of geometry. The study is based on efficiency in degradation by using different additives in hydrodynamic cavitation. Also the effect of different physical parameters viz. concentration, temperature, initial pH, pressure has been investigated. An orifice plate is used as a cavitating device. Efficiency using additives such as hydrogen peroxide, Fenton's reagent, advanced Fenton process and combination of Na2S2O8 and FeSO4 on the extent of degradation has been investigated. Complete degradation of Imidacloprid was achieved at optimized parameters. At optimized parameters, experiments were carried using different cavitating device such as venturi. The work conclude that hydrodynamic cavitation can be successively use for complete degradation of Imidacloprid.

Oxidative treatment of crude pharmaceutical industry effluent by hydrodynamic cavitation

Journal of Environmental Chemical Engineering, 2020

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Cavitation: A tool for treatment of industrial waste water

Journal of Industrial and Environmental Chemistry, 2021

Many industries release polluted waste water in the surrounding environment which is most toxic to the aquatic life and human health. Cavitation is one of the phenomena which is applied for treatment of waste water for reduction of different hazardous parameters that are released in environment. The aspects of medicinal consumption and release of waste water from textile and dairy industry are increasing day by day which leads to release of different chemicals, by-products and waste into water. This contaminates the natural water, so its effect should be mitigated, for this there are several processes utilize viz. Sonoelectrochemical catalytic oxidation, Acoustic cavitation, Advanced Oxidation processes. Conspicuously, variety of dyes, chemical dye stuff, pharmaceutical compounds, textile raw materials, etc increases the water polluting parameter. By usage of techniques namely Sonofenton, ultrasound cavitation, Sonolysis, AOP, Ozonation and Ultrasonic dying the toxicity of chemicals is reduced. To meet the need of better and safer environment cavitation is the good process to degrade the several pollutants that causes pollution. All analysis gives the result that fulfils the required outcome with an effective result.

Hydrodynamic Cavitation: An approach to Degrade Chlorpyrifos Pesticide from Real Effluent

KSCE Journal of Civil Engineering, 2017

Chlorpyrifos (O,O-diethyl O-3,5,6-trichloropyridin-2-yl phosphorothioate) is a broad spectrum organophosphate pesticide which is widely used in agriculture and residential pest control throughout the world. It is moderately toxic to humans, which persists in nature for relatively long period due to its physicochemical and structural properties, low volatilization, affecting environmental matrices. Thus has been selected as model pollutant for degradation using hybrid treatment method of Hydrodynamic Cavitation (HC). It was found that Chlorpyrifos in real effluent sample can be degraded with orifice induced cavitating conditions. Effect of various process parameters such as operating inlet pressure (over range of 3-8 bars), operating temperatures (with sets of intense cooling, moderate cooling and uncontrolled operation) and pH (natural pH = 10, neutral = 7 and acidic = 3) is investigated for extent of degradation of Chlorpyrifos. Results reflect that an optimum value of inlet pressure (5 bars) gave maximum removal/degradation of 72.7%, high temperature and acidic pH of 3 are suitable. To study the effect of intensification, ozone was used as an intensifying agent. Ozone alone gave 12.2% degradation, but when combined with hydrodynamic cavitation, it resulted into 100% efficiency in 45 minutes of treatment time. Work presented in this paper can be said to be concluding to the effective use of hydrodynamic cavitation in combination with ozone for the degradation of Chlorpyrifos in real wastewaters.