Environmental Engineering Reference
In-Depth Information
Corrective actions:
Tap a metal rod into pressure tap pipe when
the unit is not in operation; apply compressed air to pressure
tap while the unit is in operation (follow the manufacturer's
safety guidelines).
•
symptom 20.
Preheat burner in fluidized bed fails and alarm
sounds.
Causal factors:
Pilot flame not receiving fuel or spark; defective
pressure regulators; pilot flame igniting but flame scanner is
malfunctioning
Corrective actions:
Correct fuel system problem; replace defec-
tive part; replace defective regulators; clear scanner sight glass;
replace defective scanner.
•
symptom 21.
Bed temperature in fluidized bed is too high.
Causal factors:
Bed gun fuel feed rate too high; grease or high
organic content in sludge (high heat value)
Corrective actions:
Reduce bed gun fuel feed rate; increase air-
flow rate; decrease sludge fuel rate.
•
symptom 22.
Bed temperature in fluidized bed reads off scale.
Causal factor:
Thermocouple burned out
Corrective action:
Replace thermocouple.
•
symptom 23.
Scrubber inlet in the fluidized bed shows high
temperature.
Causal factors:
No water flowing in scrubber; plugged spray noz-
zles; ash water not recirculating
Corrective actions:
Open valves to provide water; correct sys-
tem malfunction to provide required pressure; clear nozzles and
strainers; repair or replace recirculation pump; unclog scrubber
discharge line.
•
symptom 24.
Fluidization in fluidized bed is poor.
Causal factor:
Sand leakage through support plate during shut
down
Corrective actions:
Clear wind box; clean wind box at least once
per month.
10.8 land aPPliCaTion of biosolids
The purpose of land application of biosolids is to dispose of the
treated biosolids in an environmentally sound manner by recycling
nutrients and soil conditioners. To be land applied, wastewater biosolids
must comply with state and federal biosolids management and disposal
regulations. Biosolids must not contain materials that are dangerous to
human health (e.g., toxins, pathogenic organisms) or dangerous to the
