THE DEVELOPMENT OF A DEWATERING SOLUTION FOR A VERY DIFFICULT MIXED ANAEROBICALLY DIGESTED BIOSOLIDS SLUDGE AT THE HONG KONG SHATIN SEWAGE TREATMENT WORKS
Abstract:A minimum of 30 percent dry solids Environmental Protection Department's (EPD) landfill requirement made the solution for dewatering options quite difficult and unique. The thought that Hong Kong sludges are similar and possibly easier to process than North American and European biosolids was found to be misleading.
After years of testing and evaluating pilot size dewatering equipment, and having a database from full scale membrane filter press operations at several plants, the “high solids” version of the “Solid Bowl Conveyor Centrifuge” was selected for the Shatin STW, the largest secondary sewage treatment works in the Hong Kong Special Administrative Region (SAR). Due to some reasons not fully understood at the time and blended with alum water sludge, the biosolids from Shatin STW dewater quite poorly and reaching 30% dryness continuously together with a total suspended solids requirement of the centrate return to the plant headwork at less than 500 mg/L is quite an achievement. The pre-evaluation, selection method, startup experiences, and operation data will be reviewed.
Document Type: Research Article
Publication date: January 1, 2000
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