Treatment Technologies for Organic Wastewater

Zheng, Chunli; Zhao, Ling; Zhou, Xiaobai; Fu, Zhimin; An, Li

doi:10.5772/52665

Cited by 71 publications

(49 citation statements)

References 58 publications

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“…However, it is difficult to control the stability of the soy sauce treatment processes because of annual fluctuations in the amount of waste soy sauce generated (47,914 tons were produced in 2016 compared to 37,232 tons in 2015 and 40,461 tons in 2014) [3]. Biological treatment removes only a small fraction of the organic matter that contributes to the color of the effluents [4][5][6]. Therefore, the wastewater discharged to the environment is colored, which is aesthetically displeasing; moreover, the wastewater could affect the ecosystem due to its non-biodegradability and recalcitrance [7].…”

Section: Introductionmentioning

confidence: 99%

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Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce

2018

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Currently, the ozone (O3) oxidation efficiency in the treatment of waste soy sauce provides 34.2% color removal and a 27.4% reduction in its chemical oxygen demand (COD). To improve the O3 oxidation efficiency, hydrogen peroxide (H2O2) is used to cause a H2O2/O3 process. In H2O2/O3 process experiments, a previously optimized pH of 11 and applied O3 dose of 50 mg L−1 were used and the H2O2/O3 ratio was varied between 0.1 and 0.9 in intervals of 0.2. The results show that an H2O2/O3 ratio of 0.3 results in the highest efficiencies in terms of color removal (51.6%) and COD reduction (33.8%). Nanofiltration (NF) was used to pretreat the waste soy sauce to improve color removal and COD reduction. The results showed that NF with an NE-70 membrane results in 80.8% color removal and 79.6% COD reduction. Finally, the combination of NF and H2O2/O3 process resulted in the best treatment efficiency: 98.1% color removal and 98.2% COD reduction. Thus, NF & H2O2/O3 process can be considered as one of the best treatment methods for waste soy sauce, which requires high intrinsic color removal and COD reduction efficiencies.

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Section: Introductionmentioning

confidence: 99%

“…COD: Chemical oxygen demand; 2 BOD: Biochemical oxygen demand; 3 TN: Total nitrogen; 4 TP: Total phosphorus;5 TOC: Total organic carbon.…”

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confidence: 99%

Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce

2018

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“…Chinese traditional herbal drug wastewater is a kind of organic high concentration wastewater, with a complex composition of such wastewater, high COD/SS concentration, high chromaticity, quality fluctuating, pH values changing frequently and better biodegrading ability characteristics 1 . There are several methods of treatment for Chinese traditional herbal drug wastewater such as physicochemical, biochemical, chemical and physicochemical-biochemical [2][3][4][5][6][7] and biochemical or physicochemical-biochemistry process technology are used in most situation.…”

Section: Introductionmentioning

confidence: 99%

Study on Treatment Process Improvement of Herbal Drug Wastewater

Sun¹,

Li²,

Zhang³

2013

Asian J. Chem.

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Pilot test is made to research the treatment effect of traditional Chinese herbal drug synthetic wastewater by hydrolysis acidification and two-stage biological aerated filter (BAF) on the base of analyzing the reasons that the effluent of existing process failing to reach the standard. The experimental result shows that when the influent COD, SS and colour average 970 mg/L, 145 mg/L and130 times respectively; those in effluent are 80 mg/L, 43 mg/L and 130 times. The effluent quality conforms to the first class criteria specified in the comprehensive wastewater emission standard.

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“…The downstream solvents employed in chemical industries, such as pharmaceuticals, fine chemicals could also be a solution. That will allow not only the elimination of very expensive treatments that usual are needed to eliminate such residues [16] and at the same time making feasible at acceptable costs the process of production energy and other value-added products from biorefining biomasses. Those who believe that biorefineries can be a way out ou part of the solution to improve the environment, so are striving to find alternatives completely sustainable and fossil sources-free.…”

Section: Short Communicationmentioning

confidence: 99%