Modular system for upstream wastewater sampling

Abstract

Provided herein is a wastewater sampling system including: an inlet tube; an outlet port; a high-flow circuit fluidly coupling the inlet tube to the outlet port; a first pump, along the high-flow circuit, configured to pump wastewater through the high flow circuit; a sampling circuit, fluidly coupled to the high-flow circuit via a junction, comprising a solid waste filter fluidly coupled to the junction and a solid-phase extraction cartridge fluidly coupled to an outlet of the solid waste filter; a second pump along the sampling circuit; a controller configured to, during a sampling cycle at a first time, activate the first pump; at a second time, activate the second pump; and at a third time succeeding the second time by a sampling duration, deactivate the second pump.

1 . A wastewater sampling system comprising:
 an inlet tube configured to extend into a sewage flow;   an outlet port;   a high-flow circuit fluidly coupling the inlet tube to the outlet port;   a first pump positioned along the high-flow circuit and configured to pump wastewater from the sewage flow, through the inlet tube, and out of the outlet port;   a sampling circuit fluidly coupled to the high-flow circuit via a junction and comprising:
 a solid waste filter fluidly coupled to the junction; and 
 a solid-phase extraction cartridge fluidly coupled to an outlet of the solid waste filter; and 
   a controller configured to, during a sampling cycle:
 at a first time, activate the first pump to initiate flow of wastewater from the sewage flow through the high-flow circuit; 
 at a second time, activate the second pump to divert wastewater from the high-flow circuit into the sampling circuit via the junction; and 
 at a third time succeeding the second time by a sampling duration, deactivate the second pump. 
   
     
     
         2 . The wastewater sampling system of  claim 1 , further comprising a fluid repository fluidly coupled to the sampling circuit. 
     
     
         3 . The wastewater sampling system of  claim 2 , wherein an inlet of the solid-phase extraction cartridge is fluidly couple an the outlet of the fluid repository. 
     
     
         4 . The wastewater sampling system of  claim 1 , further comprising an external casing suspended above a sewage flow at a sewage access point, the external casing housing:
 the high-flow circuit;   the first pump;   the sampling circuit;   the second pump; and   the controller;   wherein the inlet tube is coupled to the external casing and traverses the external casing to extend into the sewage flow; and   wherein the outlet port is coupled to the external casing and traverses the external casing.   
     
     
         5 . The wastewater sampling system of  claim 1 , wherein:
 the first pump further comprises a first peristaltic pump; and   the second pump further comprises a second peristaltic pump.   
     
     
         6 . The wastewater sampling system of  claim 1 , wherein the solid-phase extraction cartridge is configured to extract drug metabolites from wastewater while sewage flows through the solid-phase extraction cartridge. 
     
     
         7 . The wastewater sampling system of  claim 1 :
 wherein the sampling circuit further comprises:
 a diverter valve fluidly coupled to the outlet of the solid waste filter and defining a set of outlets; and 
 a set of solid-phase extraction cartridges comprising the solid-phase extraction cartridge, each solid-phase extraction cartridge in the set of solid-phase extraction cartridges fluidly coupled to an outlet in the set of outlets defined by the diverter valve; and 
   wherein the controller is further configured to, during a second sampling cycle, actuate the diverter valve to direct flow of wastewater in the sampling circuit to a second solid-phase extraction cartridge in the set of solid-phase extraction cartridges.   
     
     
         8 . The wastewater sampling system of  claim 1 , wherein the solid waste filter defines a pore size configured to capture bacteria from wastewater. 
     
     
         9 . The wastewater sampling system of  claim 1  further comprising:
 a sampling assembly comprising:
 the inlet tube; 
 the first pump; 
 the outlet port; 
 the second pump; and 
 the controller; and 
 a replaceable filter kit comprising:
 the high-flow circuit; and 
 the sampling circuit. 
 
 
 
     
     
         10 . The wastewater sampling system of  claim 1 , wherein the controller is further configured to, during the sampling cycle, at the second time succeeding the first time by a priming duration, activate the second pump to divert wastewater from the high-flow circuit into the sampling circuit via the junction. 
     
     
         11 . The wastewater sampling system of  claim 1 , wherein the controller is further configured to periodically execute a series of sampling cycles over a sampling period. 
     
     
         12 . The wastewater sampling system of  claim 11 , wherein the controller is further configured to, 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 sampling cycle, wherein a total volume of wastewater passing through the solid-phase extraction cartridge over the daily sampling period is approximately equal to a sample volume specification of the solid-phase-extraction cartridge. 
     
     
         13 . The wastewater sampling system of  claim 11 , wherein the controller is further configured to periodically execute the series of sampling cycles separated by a sampling interval consistent with a fluid flow model defining a flush duration in the sewage flow. 
     
     
         14 . The wastewater sampling system of  claim 1  further comprising a flow restrictor coupled to the outlet port and configured to maintain a backpressure in the high-flow circuit sufficient to enable consistent flow of wastewater from the high-flow circuit into the sampling circuit during activation of the second pump. 
     
     
         15 . The wastewater sampling system of  claim 1 :
 further comprising a flowmeter fluidly coupled in-line on the sampling circuit and configured to measure a flow rate through the sampling circuit; and   wherein the controller is further configured to, during the sampling cycle and during activation of the second pump:
 measure the flow rate of wastewater through the sampling circuit; and 
 execute closed loop control of the second pump to achieve a target flow rate of wastewater through the sampling circuit. 
   
     
     
         16 . A wastewater sampling system comprising:
 a sampling assembly comprising:
 an inlet tube configured to extend into a sewage flow; 
 a first peristaltic pump; 
 a first outlet port; 
 a second peristaltic pump; 
 a second outlet port; and 
 a controller; 
   a replaceable filter kit comprising:
 a high-flow circuit configured to connect with the inlet tube and the first outlet port and engage with the first peristaltic pump in the sampling assembly; and 
   a sampling circuit:
 fluidly coupled to the high-flow circuit via a junction; 
 configured to engage with the second peristaltic pump in the sampling assembly and connect with the second outlet port in the sampling assembly; and 
 comprising a solid waste filter fluidly coupled to the junction and a solid-phase extraction cartridge fluidly coupled to an outlet of the solid waste filter; 
   wherein the controller is configured to, during a sampling cycle and while the replaceable filter kit is engaged with the sampling assembly:
 at a first time, activate the first peristaltic pump to initiate sewage flow through the high-flow circuit; 
 at a second time succeeding the first time, activate the second peristaltic pump to divert sewage flow from the high-flow circuit into the sampling circuit via the junction; and 
 at a third time succeeding the second time by a sampling duration, deactivate the second peristaltic pump. 
   
     
     
         17 . The wastewater sampling system of  claim 16 , wherein the controller is further configured to:
 periodically execute a series of sampling cycles over a sampling period; and   succeeding the sampling period, prompt a user to replace the replaceable filter kit.   
     
     
         18 . The wastewater sampling system of  claim 16 , wherein the controller is further configured to, during a purge cycle subsequent to the daily sampling period:
 activate the first pump in reverse to initiate air flow through the high-flow circuit and remove excess wastewater from the high-flow circuit; and   activate the second pump to initiate air flow from the high-flow circuit through the sampling circuit via the junction and remove excess wastewater from the sampling circuit.   
     
     
         19 . The wastewater sampling system of  claim 16 , wherein the sampling assembly further comprises:
 a first quick disconnect fitting arranged at an interface between the inlet tube and the high-flow circuit and configured to seal excess wastewater within the high-flow circuit upon removal of the replaceable filter kit;   a second quick disconnect fitting arranged at an interface between the first outlet port and the high-flow circuit and configured to seal excess wastewater within the high-flow circuit upon removal of the replaceable filter kit; and   a third quick disconnect fitting arranged at an interface between the second outlet port and the sampling circuit and configured to seal excess wastewater within the sampling circuit upon removal of the replaceable filter kit.   
     
     
         20 . 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 solid-phase extraction cartridge fluidly coupled to an outlet of the solid waste filter;   a second pump configured to pump volumes of wastewater through the solid waste filter and the solid-phase extraction cartridge; and   a controller configured to:
 periodically execute a series of sampling cycles of 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 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; 
 at a second time succeeding the first time, activate the second pump to pass wastewater through the solid waste filter and 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.