Provides an alternative to \mkcomprange for printing a leading zero in a compressed range of numbers less than 10.

mkcomprangezero.tex

\newrobustcmd*{\mkcomprangezero}{%
  \begingroup
  \@ifstar
    {\blx@range@aux\blx@comprange@ii}
    {\blx@range@aux\blx@comprange@i}}
\def\blx@comprange@i[#1][#2]#3{%
  \let\blx@tempa\@empty
  \protected\def\blx@range@out@value{\appto\blx@tempa}%
  \def\blx@range@out@item@process{#2}%
  \let\blx@range@out@delim\blx@range@out@value
  \let\blx@range@split\blx@genrange@split
  \let\blx@range@process\blx@comprange@check
  \blx@range@chunk{#3}%
  \begingroup
  \edef\blx@tempa{\endgroup
    \unexpanded{#1}{\expandonce\blx@tempa}}%
  \blx@tempa
  \endgroup}
\def\blx@comprange@ii[#1][#2]#3{%
  \protected\def\blx@range@out@value{#1}%
  \def\blx@range@out@item@process{#2}%
  \let\blx@range@out@delim\@firstofone
  \let\blx@range@split\blx@genrange@split
  \let\blx@range@process\blx@comprange@check
  \blx@range@chunk{#3}%
  \endgroup}
\def\blx@comprange@check#1#2{%
  \blx@imc@ifinteger{#1}
    {\blx@imc@ifinteger{#2}
       {\@firstoftwo}
       {\@secondoftwo}}
    {\@secondoftwo}
    {\blx@comprange@comp{#1}{#2}}
    {\begingroup
     \protected@edef\blx@tempc{\endgroup
       \blx@range@out@value{%
         \blx@range@out@item@process{\unexpanded{#1}}%
         \noexpand\bibrangedash
         \blx@range@out@item@process{\unexpanded{#2}}}}%
     \blx@tempc}}
\def\blx@comprange@comp#1#2{%
  \def\blx@tempb{#1}%
  \def\blx@tempc{#2}%
  \let\blx@tempd\blx@tempc
  \ifnum\c@maxcomprange<\abx@rangeproclimit\relax
    \numdef\blx@tempe\abx@rangeproclimit
  \else
    \numdef\blx@tempe\c@maxcomprange
  \fi
  \blx@tempcntc=\blx@tempe\relax
  \ifnum
    \ifnum\c@mincompwidth<1\space1\fi
    \ifnum\c@maxcomprange<10\space1\fi
    \ifnum\c@mincomprange<\blx@tempb\space\else1\fi
    \ifnum\blx@tempb<\numexpr\blx@tempcntc*10\relax\else1\fi
  0=\z@
    \expandafter\blx@comprange@comp@div
  \else
    \expandafter\blx@comprange@end
  \fi}
\def\blx@comprange@end{%
  \numdef\blx@tempb\blx@tempb
  \ifnum\blx@tempe>\c@maxcomprange\relax
    \numdef\blx@tempc\blx@tempc
  \else
    \numdef\blx@tempc\blx@tempd
  \fi
  \begingroup
  \protected@edef\blx@tempb{\endgroup
    \blx@range@out@value{%
      \blx@range@out@item@process{\blx@tempb}%
      \noexpand\bibrangedash
	  % mkcomprangezero changes start here
	  \ifnum\blx@tempc<10
	    \ifnum\blx@tempb<10
		  \blx@range@out@item@process{\blx@tempc}
		\else
	      \blx@range@out@item@process{0\blx@tempc}% force leading zero
		\fi
	  \else
	    \blx@range@out@item@process{\blx@tempc}
	  \fi}}% mkcomprangezero changes end here
  \blx@tempb}
\def\blx@comprange@comp@div{%
  \unless\ifnum\blx@tempb<\blx@tempcntc
    \blx@tempcnta\blx@tempb\relax
    \blx@tempcntb\blx@tempc\relax
    \divide\blx@tempcnta\blx@tempcntc
    \divide\blx@tempcntb\blx@tempcntc
    \ifnum\blx@tempcnta=\blx@tempcntb
      \edef\blx@tempd{\expandafter\@gobble\blx@tempd}%
      \numdef\blx@tempe\blx@tempcntc
    \fi
  \fi
  \divide\blx@tempcntc10\relax
  \ifnum
     \ifnum\blx@tempcntc<10 1\fi
    \ifnum\blx@tempcntc>\c@mincompwidth\else 1\fi
  0=\z@
    \expandafter\blx@comprange@comp@div
  \else
    \expandafter\blx@comprange@end
  \fi}

The only changes from \mkcomprange are in lines 73 to 82, but the code may be helpful to others. Simply use \mkcomprangezero anywhere a Biblatex style might use \mkcomprange.