Microalgal separation from high-rate ponds

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5266623

Nurdogan, Y

High rate ponding (HRP) processes are playing an increasing role in the treatment of organic wastewaters in sunbelt communities. Photosynthetic oxygenation by algae has proved to cost only one-seventh as much as mechanical aeration for activated sludge systems. During this study, an advanced HRP, which produces an effluent equivalent to tertiary treatment has been studied. It emphasizes not only waste oxidation but also algal separation and nutrient removal. This new system is herein called advanced tertiary high rate ponding (ATHRP). Phosphorus removal in HRP systems is normally low because algal uptake of phosphorus is about one percent of their 200-300 mg/L dry weights. Precipitation of calcium phosphates by autofluocculation also occurs in HRP at high pH levels, but it is generally not complete due to insufficient calcium concentration in the pond. In the case of Richmond where the studies were conducted, the sewage is very low in calcium. Therefore, enhancement of natural autoflocculation was studied by adding small amounts of lime to the pond. Through this simple procedure phosphorus and nitrogen removals were virtually complete justifying the terminology ATHRP.

• Research Organization: California Univ., Berkeley, CA (USA)
• OSTI ID: 5266623
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALGAE
BIODEGRADATION
CHEMICAL REACTIONS
CLEANING
DECOMPOSITION
DECONTAMINATION
HYDROGEN COMPOUNDS
LIMING
LIQUID WASTES
NITRATES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PLANTS
POLLUTION
PONDS
REMOVAL
SURFACE WATERS
WASTE WATER
WASTES
WATER
WATER POLLUTION