Qsens — Enthalpy or sensible heat of a stream. It is the heat contained by a material which manifests itself as a temperature. It is defined as H = c p dT.

H, Qsens — Enthalpy or sensible heat of a stream. It is the heat contained by a material which manifests itself as a temperature. It is defined as H = c p dT.

HAF — Halogen acid furnace HAP(s) — Hazardous air pollutant(s)

H c — Heat of combustion HC — Hydrocarbons HCl — Hydrogen chloride. Hydrochloric acid emissions regulated under RCRA 40 CFR §264.343(b)

to 99% removal efficiency, 1.8 kg/h (4 lb/h) maximum emission rate, or a risk-based level.

H f — Heat of formation Hg — Mercury HHV — Higher heating value. The heat of combustion of a fuel or waste which includes the latent heat

of condensation of the water formed in the process. While this value is the one measured by calorimetric means, the LHV is more appropriate for combustor determinations. See LHV. HHV = LHV + ? hw , where ?H w = latent heat of vaporization of the water produced by the combustion process.

H L — Latent heat. The heat or energy that is released by a phase change such as evaporation, boiling, or freezing. For example, the latent heat of evaporation of water is approximately 950 Btu/lb, which is the energy required to convert one pound of liquid water to one pound of vapor or steam.

HON — Hazardous Organic NESHAP hr or h — hour(s) HSWA — Hazardous and Solid Waste Amendments of 1986. The law that reauthorized RCRA with a

number of changes and expansions. HW — Hazardous waste

© 2003 by CRC Press LLC

HWC — Hazardous waste combustor HWI — Hazardous waste incinerator ID — Induced draft. A means of supplying air to a combustion chamber or APCD by placing the fan

(or other air mover) downstream (after) the device so that the fan pulls the air through the device. An induced draft system operates at a pressure below atmospheric. See also Forced Draft.

Impinger —

A device used in sampling trains for collecting gaseous and (at times) particulate compo- nents from stack gases. Impingers are produced in two sizes.

Incinerator —

A closed furnace or similar device specifically intended to burn waste material. IR — Infrared light IWS — Ionizing wet scrubber. An air pollution control device that combines the performance of a

scrubber for HCl control and an ESP for particulate control. kV — Kilovolts, 103 Volts kVA — Kilovolt-amperes (product of voltage and current). A measure of the power usage of an electrical

device. It is one of the parameters that is used to describe the operating performance of an ESP or IWS. kVA is dimensionally analogous to kW, although they actually measure somewhat different parameters.

kW — Kilowatts, 103 watts. A measure of the power input into an electical device such as a motor. For DC systems, the power input in kW is equivalent to the kVA. For AC systems, the power input is equivalent to kVA times the phase angle shift due to inductance in the circuit.

lb(s) — Pound(s), avoirdupois (avdp.) lb-mole — Pound mole, the number of atoms or molecules of a substance that equals its atomic or

molecular weight in grams. For example, 1 pound-mole of benzene, molecular weight 78, is equivalent to 78 pounds of benzene. This term is also equal to, approximately, 2.732 ¥ 10 25 atoms or molecules of the substance. A quantity of the substance of this size is referred to as a lb-mole. LD-50 — Lethal dose-50, The concentration of a contaminant in air or the quantity as a mg of contam- inant per kg of body weight of a solid or liquid which results in the mortality of 50% of a population of test animals. The LD-50 often also specifies the type of animal, i.e., mouse, rat, etc. This is a common indicator of the acute toxicity of materials.

L/G — Liquid-to-gas ratio. This is a ratio commonly used in the design and operation of wet scrubbers. LHV — Lower heating value. The heat of combustion of a fuel or waste that does not take into account

the latent heat of water. The LHV is usually the more appropriate value to use for most incinerator calculations.

LI — Liquid (injection) incinerator LVM — Low volatility metals LWA — Lightweight aggregate LWAK — Lightweight aggregate kiln M— Minute of time (60 seconds) M— Meter of length MACT — Maximum achievable control technology mg/kg — Milligrams per kilogram

mg/m 3 — Milligrams per cubic meter MHI — Multiple hearth incinerator MM — Million (10 6 ) as in MMBtu = 106 Btu MM5 — EPA Modified Method 5. A commonly used name for SW-846 Method 0010 that measures organic compunds with boiling points that are greater than 100°C (212°F). It is sometimes referred to as “semi-VOST.”