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Food and agricultural processing and industrial wastewater treatment

2016-06-23 14:38:36 天工欧凯 Read

(1)Food-and-agricultural-processing-and-industrial-wastewater-treatment.jpg

Above design (GB18918-2002) "urban sewage treatment plant emission standards" according to the water quality of 50mg / L

Produce large amounts of high concentrations of acidic organic wastewater in the food and agro-food processing, mainly soluble starch and a small amount of protein, generally not toxic, but COD is high, typically 1000 ~ 30000mg / L, SS was 1500mg / L . As will be discharged directly into the environment water, not only cause serious harm to the environment, but also result in waste of water resources.

Wastewater from the processing plant into the first set of wells accumulated water, re-use flotation machine tiny suspended solids discharged from the system through the physical and chemical dosing methods. (If required in the pretreatment step potato starch is added grit system) sewage by flotation device after the release of oxygen into the cell, with reduced water release oxygen DO values pool residence time. Ensure the normal hydrolysis acidification process.

Objective System Configuration regulating acidification tank of one regulation of water, wastewater and second, pre-acidification, improve the efficiency of the anaerobic unit. Regulating acidification tank wastewater pump regularly upgraded to EGSB reactor water distribution, in order to ensure access to quality uniform EGSB reactor, water stability. Waste water entering the water distribution EGSB anaerobic reactor, a large number of wastewater removal of COD, BOD, will be converted into biogas. EGSB reactor effluent into the flocculation tank, biogas is produced through the water sealing, through sealing desulfurization tank and water into the gas tank storage. Biogas power generation, wastewater treatment systems supplying electricity through biogas generators.

Anaerobic tank effluent gravity into the aerobic tank, aerobic biological treatment tank rely autotrophic bacteria (denitrifying bacteria) complete, they take advantage of decomposition of organic matter or inorganic carbon in the air to produce carbon dioxide as a nutrient source, sewage ammonia converted to NO2 - N, NO3 - N. Part of the aerobic biochemical pool water into the sedimentation tank precipitation, the other returned to the anaerobic tank for internal circulation, in order to achieve the purpose of denitrification. In the anaerobic tank and aerobic biological tank filler are installed, the whole process depends on biochemical attached to the filler to complete a variety of microorganisms. Dissolved oxygen in the anaerobic tanks controlled 0.5mg / l or so; in aerobic biochemical pool of dissolved oxygen control in 3mg / l or more, gas-water ratio 15: 1. Secondary settling tank through the sewage discharge standards.

Aerobic biochemical pool water backflow into the part of the anaerobic tank; a flow into vertical flow sedimentation tank, solid-liquid separation.



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