CHICAGO – An engineering student was learning about the criminal justice system Tuesday after police found a bound woman convulsing, a grenade launcher and a large container of hallucinogenic mushrooms in his apartment, authorities said.

Michael Petrelli, 29, also had marijuana, a fully loaded assault rifle, a loaded handgun, ammunition, lab equipment and some unknown chemicals that are being tested, Assistant State’s Attorney James Del Castillo said.

Bond for Petrelli, who was charged with possession of a controlled substance and misdemeanor weapons violations, was set at $250,000 during a court appearance Tuesday at the Cook County Criminal Courthouse.

Petrelli, a native of suburban Elk Grove Village with no apparent criminal history, appeared in court via closed circuit television.

Defense attorney Ziad Alnaqib asked Judge Raymond Myles to set a reasonable bond because his client is in his final semester at University of Illinois at Chicago. Although he acknowledged that Petrelli is facing serious charges, Alnaqib said the chemicals and lab equipment may prove to be related to Petrelli’s studies.

“There may be innocuous and innocent explanations for the stuff,” Alnaqib said.

UIC spokesman Bill Burton confirmed Tuesday that the school has an engineering student named Michael Petrelli, but could not provide further details.

Police officers responding to a disturbance at Petrelli’s West Side apartment at about 6:45 a.m. Monday discovered the contraband, authorities said.

As they entered the apartment, the officers found a woman tied up on a sofa in the front room suffering from convulsions, Del Castillo said.

Petrelli allegedly told the officers the woman began convulsing after ingesting hallucinogenic mushrooms and that he had tried to “subdue” her, Del Castillo said.

The officers then spotted the assault rifle under the sofa.

A subsequent search of the apartment turned up the other weapons, the marijuana and the mushrooms, he added. The grenade launcher was not loaded. Authorities are trying to determine how he obtained it, Del Castillo said.