### Question
Can you define what coal waste sludge means?


### Answer
**Coal waste sludge** is defined as the following in *26 U.S.C. § 45*:

> the tar decanter sludge and related byproducts of the coking process, including such materials that have been stored in ground, in tanks and in lagoons, that have been treated as hazardous wastes under applicable Federal environmental rules absent liquefaction and processing with coal into a feedstock for the manufacture of coke

#### Citation:
  - *26 U.S.C. § 45*
  - Heading: **Subtitle A-Income Taxes > CHAPTER 1-NORMAL TAXES AND SURTAXES > Subchapter A-Determination of Tax Liability > PART IV-CREDITS AGAINST TAX > Subpart D-Business Related Credits**

