Abstract
The effects of the composite coagulants on coagulation sedimentation for the preserved wastewater was investigated by changing the composite coagulant dosages, and the coagulant was composed of polymeric ferric sulfate (PFS), polyaluminium chloride (PAC), and polyaluminum ferric silicate (PAFSC), while the effect of the tertiary treatment process on the preserved wastewater was tested, which was exceeded the standard seriously. The results showed that 400 mg/L was the optimum composite coagulant dosage. The removal rates of salt and sugar were as high as 99.1% and 99.5% respectively, and the removal rates of COD Cr and SS were 99.3% and 96.0%, respectively after the preserved wastewater was treated by the tertiary treatment technology, which both reached the primary standard of “The Integrated Wastewater Discharge Standard” (GB8978-1996).
Highlights
Preserved fruits, is a popular fruit and vegetable pickled food with local characteristics in China, using various fresh fruits as raw materials, after a series of processes such as pickling, rinsing, sugar boiling, dipping, natural spices, edible pigments, preservatives, and other food additives are added, the dry state or semi dry state products are obtained by solarization or artificial drying [1,2]
Part of the problems about “high yield but low income” for the Chaoshan fruit planting industry are solved by the production of preserved fruits, which can increase the income of the farmers, the pollution generated in the productive process of preserved fruits can not be ignored
Ten measuring cylinders with 100 ml preserved wastewater were taken, and the influences of different composite coagulant dosages on the effect of coagulation sedimentation for the preserved wastewater were compared by changing the composite coagulant dosage which was composed of polymeric ferric sulfate (PFS), polyaluminium chloride (PAC), and polyaluminum ferric silicate (PAFSC) in the measuring cylinders in order to determine the optimum dosage of the composite coagulant, and used in the tertiary treatment technology to dispose the preserved wastewater, investigating the effect of the tertiary treatment technology on the preserved wastewater
Summary
Preserved fruits, is a popular fruit and vegetable pickled food with local characteristics in China, using various fresh fruits as raw materials, after a series of processes such as pickling, rinsing, sugar boiling, dipping, natural spices, edible pigments, preservatives, and other food additives are added, the dry state or semi dry state products are obtained by solarization or artificial drying [1,2]. The Chaoshan preserved fruits are the most famous sweetmeat in Cantonese style preserved fruits, which occupies great share of the preserved fruits of the market due to the rich fruit resources, unique local flavor, and centuries-old local folk traditional craft in Chaoshan area [3]. The concentrations of CODCr and SS of preserved wastewater are high, river water and nearby farmlands are polluted when preserved wastewater discharges without treatment [5]. The research of treatment technology for preserved wastewater has an important significance in saving energy, making full use of water resources, and reducing emissions, showing a significant social benefit. It can reduce the CODCr concentration substantially, exhibiting an obvious economic effectiveness. The influence of the composite coagulant dosage on the effect of coagulation sedimentation for the preserved wastewater was investigated, and the tertiary treatment technology was adopted to dispose preserved wastewater, using salt removal rate, sugar removal rate, CODCr removal rate, and SS removal rate as evaluation criterions to investigate the treatment effect of the tertiary treatment technology for the preserved wastewater
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