Abstract
In this paper, COD Cr index was adopted as the test item, and the wastewater from the secondary sedimentation tank of a sewage treatment plant selected was treated by the method of "sodium hypochlorite oxidation - activated carbon adsorption - coagulation precipitation". The results showed that the removal rate of COD Cr reached 57.3% by the treatment of "sodium hypochlorite oxidation - activated carbon adsorption - coagulation precipitation". Therefore, this method can improve the removal rate of COD Cr , can make the wastewater discharging standard, and for the project provides data support to better treatment of industrial wastewater. Keywords Secondary settling tank; COD Cr ; Fenton oxidation; Sodium hypochlorite oxidation; Treat reach the standard DOI : 10.7176/CER/11-6-01 Publication date :July 31 st 2019
Highlights
The rapid development of economy promotes social progress, and brings harm to the environment, which makes pollution become a big problem, among which water pollution is the top priority
3 Results and discussion 3.1 Test results of raw water samples The raw water samples were tested according to the method described in 1.1
3.2 Sodium hypochlorite oxidation experiment 3.2.1 Oxidation effect of sodium hypochlorite As described in 2.3.1, the CODCr of water samples was determined at different sodium hypochlorite content, and the adsorption-coagulation secondary treatment was performed for each water sample
Summary
The rapid development of economy promotes social progress, and brings harm to the environment, which makes pollution become a big problem, among which water pollution is the top priority. This study will be activated carbon adsorption materials as well as the coagulant polyaluminium chloride (PAC) and polyacrylamide (PAM) is applied to the sodium hypochlorite oxidation - activated carbon adsorption and coagulation precipitation "integrated oxidation method [7-12], to deal with the second pond wastewater, by improving the removal rate of CODCr, prompting wastewater treatment standards, to provide experimental data for water treatment engineering. 2.2 Sodium hypochlorite oxidation of wastewater 2.2.1 Oxidation experiment and adsorption-coagulation secondary treatment Under the pH condition of the raw water from the secondary sedimentation tank, 0.2‰, 0.5‰, 1‰, 1.2‰ and 1.5‰ sodium hypochlorite solutions (free chlorine 5.2%) were added for oxidation reaction for 1h. The supernatant was taken to detect CODCr. The effluent from the above five groups of experiments was added with 0.5‰ activated carbon for adsorption reaction for 1h. 2.2.3 Activated carbon adsorption - coagulation sedimentation Under the condition of raw water pH, the dosage of fixed sodium hypochlorite solution was 1‰. After adsorption for 1h, 10%PAC solution of 2mL and 2.5‰PAM solution of 2mL were added for flocculation and precipitation
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