Process Chemistry And Laboratory Analysis

Process Chemistry And Laboratory Analysis
Product improves total solids destruction in aerobic digester

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Product improves total solids destruction in aerobic digester

Problem: Operators in an east-central Missouri city wanted better digester performance in the cold months, when low volatile solids destruction and frozen soils did not allow land application of biosolids. The team wanted better settling, increased decant and more digester space.

Solution: After six months of trials, the operators discovered that BIO ENERGIZER from Probiotic Solutions could accelerate endogenous respiration by improving cell wall permeability, thus increasing biomass metabolism and reducing volume.

Result: The product created nearly 85 percent volatile solids destruction in 27 weeks and improved decants. It led to greater digester capacity, better settleability and better overall digester operation. 800/961-1220;

Microbial treatment helps facility meet load limits

Problem: Sewage treatment plant No. 4 at the Kennedy Space Center in Florida serves the vehicle assembly building area sanitary sewer system, treating 100,000 gpd. The nature of manufacturing and maintenance means a wide variety of natural and synthetic organics can enter the collection system. The plant saw periodic upsets due in part to the suspected entry of toxic organics. Operators had trouble meeting effluent nutrient limits, primarily total nitrogen. Upsets were often worst during shuttle launch and return periods, when total nitrogen removal was only 28 percent.

Solution: Operators began using Munox organic shock upset microbial treatment from Osprey Biotechnics. Pseudomonas bacteria are well-known for their ability to break down a wide range of chemicals.

Result: BOD, TSS and total nitrogen decreased. There was no evidence of shock upset although two shuttle launches occurred during the inoculation period. The addition of 2 gpd of Munox reduced susceptibility to and recovery from organic shock upset and stabilized the plant’s overall performance. 800/553-7785;

Treatment reduces contaminants in closed landfill wastewater

Problem: Leachate collected at the toe of the closed Heaps Peak Sanitary Landfill in San Bernardino County (Calif.) had been stored in tanks for transport to the Running Springs Wastewater Treatment Plant. This was expensive and, in bad weather, involved considerable risks to workers and the public.

Solution: Geo-Logic Associates (GLA) identified elevated iron, manganese and total dissolved solids (TDS) as the most problematic constituents and proposed treatment by oxidation, lime dosing and flocculation of precipitated solids within the Suspended Air Flotation System from Heron Innovators.

Result: The system was optimized to meet treatment objectives. It reduced TDS from 0.5 parts per million to 30 parts per billion, and iron and manganese concentrations from about 2.5 ppm to 20-30 ppb. This allowed the effluent to be discharged to on-site percolation galleries. 916/408-6601;

Tests reinforce peracetic acid’s high success rate in wastewater treatment

Problem: A wastewater treatment plant in Steubenville, Ohio, needed a cost-effective disinfection method that would not generate chlorinated byproducts.

Solution: Solvay Chemicals conducted plant-scale trials using Proxitane WW-12 peracetic acid (PAA) over a little more than one month. PAA, a rapidly acting disinfectant, generates no disinfection byproducts even if overdosed. The dosing system can be economically retrofitted or work in series with an existing disinfection system. The 13.5 mgd (design) plant was treating 5 to 8 mgd.

Result: PAA dosage never exceeded 1.5 ppm, and the residual chlorine averaged 0.4 ppm, never exceeding 1 ppm. PAA feed was flow-paced, CBOD remained constant and pathogen control was always within the permit limits. 800/765-8292;


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