Shopping basket > Review order Currently in your basket Before proceeding to checkout you will need you to either login or create an account. Your items will remain in your basket. USDItem TotalTreatment/Destruction of Endocrine Disruptors (371 words) $11.50Remove'Old Cogen' is Dead: Determining the Best Use of Biogas in a Dynamic Environment (15 words) $11.50RemoveManual Air Valve Positioning and Energy Use Tariffs in Activated Sludge Processes: Impacts on Operating Costs (17 words) $11.50RemovePlanning, Design, and Implementation for New and Upgraded Water Resource Recovery Facilities, 2nd edition MOP 28 1: Introduction (2,234 words) $22.00RemoveNet total: $56.50VAT: $0.00Gross total: $56.50 Payment info When you click the checkout button, you will be redirected to a secure Paypal page where you can either pay using an existing Paypal account, or pay by card without a Paypal account. Continue shopping We access Visa, Mastercard, Maestro, American Express all through Paypal.