• TREATMENT OF FOOD INGREDIENTS MANUFACTURING EFFLUENT BY PHYSICOCHEMICAL-BIOLOGICAL TWO-STAGE WASTEWATER TREATMENT SYSTEM

    Author(s):
    Lawrence K Wang (see profile) , Mu-Hao Sung Wang
    Editor(s):
    Hung-ping Tsao
    Date:
    2022
    Group(s):
    Science, Technology, Engineering, Arts and Mathematics (STEAM)
    Subject(s):
    Food--Study and teaching, Pollution, Research, Science--Study and teaching, Technology--Study and teaching
    Item Type:
    Book chapter
    Tag(s):
    food industry, dairy industry, wastewater treatment, dissolved air flotation, biological process, Food studies, Science and technology studies (STS)
    Permanent URL:
    https://doi.org/10.17613/33wd-8b25
    Abstract:
    A physicochemical (PC) and biological two-stage wastewater treatment system has successfully treated a food ingredients manufacturing effluent for decades. The first stage PC treatment is a Supracell dissolved air flotation (DAF), which has a diameter of 8 ft (2400 mm). The second stage treatment is an aerobic biological package plant. The DAF is rated at 34 cubic m/hour design capacity and was installed on top of a sludge storage tank due to DAF's short DT (3 to 5 min), compact overall size, and shallow depth of 600 mm. The DAF foot-print is almost zero. DAF influent contained milk-based TSS residues 475-640 mg/L, coconut oil FOG 100-250 mg/L, 5-day BOD 1700-2500 mg/L. With DAF pretreatment ( at 148 GPM, 27% recycle mode, with coagulation), pollutant reductions were: TSS 53-77%; FOG 60-100% and 5-day BOD 39-66%. DAF effluent went to the second stage aerobic biological package plant for additional treatment. The second stage effluent quality was excellent: TSS 20 mg/L and 5-day BOD 20 mg/L. The second stage effluent went to POTW. The floated sludge solids were analyzed to be 5.4 % (using Alum), or 9 % (using Polymer).. This publication also introduces the DAF process description, technology status, applications, advantages, disadvantages, reliability, chemical requirements, residuals, design criteria, and predicted performance in general. Specific design and operational procedures of the Supracell DAF are presented. PC and biological technologies available for the food waste treatment are reviewed and reported. Further research for possible recovery and reuse of harvested food solids and proteins as the animal foods are suggested.
    Notes:
    KEYWORDS: Memoir, Lenox Institute of Water Technology (LIWT), Krofta Engineering Corporation (KEC), Food industry, United Nations Industrial Development Organization (UNIDO), Food ingredients, Dairy industry, Two-stage physicochemical-biological treatment, Dissolved air flotation (DAF), Aerobic biological treatment, Case history, Supracell DAF, Industrial effluent pretreatment, Food solids recovery, Protein recovery, Carbonation, Flue gas reuse.
    Metadata:
    Published as:
    Book chapter    
    Status:
    Published
    Last Updated:
    5 months ago
    License:
    All Rights Reserved
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