Need advise for sewage management for an institution with 300 students

Sir,
Our Institution is housed in a huge building which holds a graguate college also. Intially the school was desigened for 600 students. As we are surrounded by public properties, we can not build a drain to the main drainage of the locality which is 140 mtrs away. The building includes two hostels with nearly 300 students. The 30-year-old soak pit refuses to soak a single drop of water. We cannot make a new one because we have the drinking water pumps at the left over land we have for this purpose. So the total institute and the enviornment is in a mess, we also have a considerable amount of outflow of chemical mixed water from the science laboratories. Please advise if we can get information from this forum about latest scientific procedures to fight such problems with limited land available or if you can please direct us to an agency who are expert in this field.

Thanks
Administrative superintendent

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