Thermo-chemical treatment of agro industry effluent by aluminum salt: Degradation of chemical oxygen demand and color

Q2 Engineering Engineering in Agriculture, Environment and Food Pub Date : 2019-04-01 DOI:10.1016/j.eaef.2018.12.004

Omprakash Sahu

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Abstract

Sugar industry wastewater has the complex characteristic. Wastewater from the sugar industry, if discharged without treatment, poses pollution problems in both aquatic and terrestrial ecosystems. An attempted has been made to treat the sugar industry wastewater in an economical way with a combination of thermal and chemical treatment by aluminium salt. Results showed thermal treatment of sugar industry wastewater were 72% COD and 74% color removal at optimum pH 4.5, working temperature 85 °C, catalyst mass loading 5 kg/m³ and treatment time 9 hrs. The treated wastewater again treated with commercial alum shows 98% COD and 99.9% color removal at pH 6.5 and mass loading 6 mM. The filterability results show combined treated wastewater having 3.64 kg/m³ cake resistance and 5.26 × 10⁻¹² medium resistance. Nearly 80% of supernatant settling was achieved at 40 min of settling time. Overall combined treatment was found to be more suitable to treat sugar industry wastewater up to the dischargeable limit.

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用铝盐热化学处理农业工业废水:化学需氧量和颜色的降解

制糖工业废水具有复杂的特点。制糖工业的废水如果未经处理就排放，会对水生和陆地生态系统造成污染问题。对铝盐热法和化学法相结合的经济处理制糖废水进行了尝试。结果表明，在最佳pH为4.5、工作温度为85 °C、催化剂质量负荷为5 kg/m3、处理时间为9 h的条件下，热处理制糖废水的COD去除率为72%，去色率为74%。经商业明矾处理后的废水在pH 6.5、质量负荷为6 mM时，COD去除率为98%，色度去除率为99.9%。过滤性能结果表明，复合处理废水的滤饼阻力为3.64 kg/m3，介质阻力为5.26 × 10−12。在40 min的沉降时间内，上清液的沉降率接近80%。综合联合处理更适合于处理达到可排放限度的制糖工业废水。

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来源期刊

Engineering in Agriculture, Environment and Food Engineering-Industrial and Manufacturing Engineering

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1.00

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0.00%

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期刊介绍： Engineering in Agriculture, Environment and Food (EAEF) is devoted to the advancement and dissemination of scientific and technical knowledge concerning agricultural machinery, tillage, terramechanics, precision farming, agricultural instrumentation, sensors, bio-robotics, systems automation, processing of agricultural products and foods, quality evaluation and food safety, waste treatment and management, environmental control, energy utilization agricultural systems engineering, bio-informatics, computer simulation, computational mechanics, farm work systems and mechanized cropping. It is an international English E-journal published and distributed by the Asian Agricultural and Biological Engineering Association (AABEA). Authors should submit the manuscript file written by MS Word through a web site. The manuscript must be approved by the author''s organization prior to submission if required. Contact the societies which you belong to, if you have any question on manuscript submission or on the Journal EAEF.