Modular system for upstream wastewater sampling

A wastewater sampling system comprising:

• an inlet tube extending into a sewage flow;
• a first pump configured to pump wastewater from the sewage flow into the wastewater sampling system;
• a solid waste filter fluidly coupled to the inlet tube;
• a fluid repository fluidly coupled to an outlet of the solid waste filter;
• the first pump is further configured to draw wastewater through the inlet tube, through the solid waste filter, and into a fluid repository;
• a solid-phase extraction cartridge fluidly coupled to an outlet the fluid repository;
• a second pump configured to pump volumes of wastewater from the fluid repository through the solid phase extraction cartridge to an outlet port;
• and
• a controller configured to:
• periodically execute a series of sampling cycles over a sampling period;
• for each sampling cycle in the series of sampling cycles, access a target flow rate of the second pump proportional to an approximate flow rate of the sewage flow during the each sampling cycle;
• and
• during each sampling cycle in the series of sampling cycles:
• at a first time, activate the first pump to initiate sewage flow into the wastewater sampling system through the inlet tube, through the solid waste filter, and into the fluid repository;
• at a second time succeeding the first time, activate the second pump to pass wastewater from the fluid repository to the solid-phase extraction cartridge at the target flow rate;
• and
• at a third time succeeding the second time by a sampling duration, deactivate the second pump.