How long should the background section of the literature review be for an engineering thesis? I am writing my M Phil thesis in engineering, on the development of a new process for treating a particular type of wastewater.

In my literature review I have a background section, which describes the nature of the problem to be solved.

Originally I used this section to thoroughly describe the problem my thesis is trying to solve.  For example, I explained the mechanism by which each contaminant effects the environment.  This section was about 3 pages long.

However, I then noticed another thesis that had recently been accepted from my university simply stated "Wastewater from process X is a serious problem" and referenced a review article.

After seeing this I rewrote my background section in a similar style to the above, and got it down to under one page.

I believe the shorter style makes more sense because the problem I am attempting to solve is well known in the literature.  If the reader wishes to know more information they can read one of the many articles describing it.

For now I am planning to go with the shorter style.  Does anyone have any insights as to which style would be better?

Also, if you are wondering why I do not ask my supervisor, it is a long story but this is not possible.

I appreciate anyone's time and thank you in advance.
Style is very discipline, department, and even person specific. So this is really up to your supervisor. We can tell what we think, but when (s)he thinks differently, then it is her or his opinion that counts.